Answer:
Scopolamine.
Explanation:
Scopolamine is also known as hyoscine. It is an anticholinergic, oral topical drug which is used to manage, and prevent motion sickness, and acute treatment. It is must be taken to be effective before the onset of motion sickness.
The scopolamine is helps to prevent communication between the vomiting center which is present in the brain, and the nerve of the vestibule by blocking the action of acetylcholine (it is a chemical which nervous used to transmit massage to each other).
Hydrazine, N2H4, may react with oxygen to form nitrogen gas and water.N2H4(aq) + O2(g) -> N2(g) + 2H2O(l)If 3.95 g of N2H4 reacts and produces 0.550 L of N2, at 295 K and 1.00 atm, what is the percent yield of the reaction?
Answer: The percent yield of the reaction is 18.7 %
Explanation:
Calculating the theoretical yield:To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of hydrazine = 3.95 g
Molar mass of hydrazine = 32 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of hydrazine}=\frac{3.95g}{32g/mol}=0.123mol[/tex]
The given chemical equation follows:
[tex]N_2H_4(aq.)+O_2(g)\rightarrow N_2(g)+2H_2O(l)[/tex]
By Stoichiometry of the reaction:
1 mole of hydrazine produces 1 mole of nitrogen gas
So, 0.123 moles of hydrazine will produce = [tex]\frac{1}{1}\times 0.123=0.123mol[/tex] of nitrogen gas
Calculating the experimental yield:To calculate the moles of nitrogen gas gas, we use the equation given by ideal gas, which follows:
[tex]PV=nRT[/tex]
where,
P = pressure of the nitrogen gas = 1.00 atm
V = Volume of the nitrogen gas = 0.550 L
T = Temperature of the nitrogen gas = 295 K
R = Gas constant = [tex]0.0821\text{ L. atm }mol^{-1}K^{-1}[/tex]
n = number of moles of the nitrogen gas = ?
Putting values in above equation, we get:
[tex]1.00atm\times 0.555L=n_{N_2}\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 295K\\\\n_{N_2}=\frac{1.00\times 0.555}{0.0821\times 295}=0.023mol[/tex]
Calculating the percentage yield:To calculate the percentage yield of nitrogen gas, we use the equation:
[tex]\%\text{ yield}=\frac{\text{Experimental yield}}{\text{Theoretical yield}}\times 100[/tex]
Experimental yield of nitrogen gas = 0.023 moles
Theoretical yield of nitrogen gas = 0.123 moles
Putting values in above equation, we get:
[tex]\%\text{ yield of nitrogen gas}=\frac{0.023}{0.123}\times 100\\\\\% \text{yield of nitrogen gas}=18.7\%[/tex]
Hence, the percent yield of the reaction is 18.7 %
Answer:
The percent yield of the reaction is 18.45 %
Explanation:
The reaction is:
N₂H₄(aq) + O₂(g) → N₂(g) + 2H₂O(l)
Ratio between hydrazine and N₂ is 1:1, so 1 mol of hydrazine produces 1 mol of N₂
The molar mass of hydrazine is 32 g/m
The moles we used are : mass / molar mass hydrazine
3.95 g / 32 g/m = 0.123 moles
So, in the 100 % yield reaction, we will produce 0.123 of gas.
Let's apply the Ideal Gases law to find out, the moles of gas that have been produced.
0.550L . 1 atm = n . 0.082 . 295K
(0.550L .1atm) / 0.082 . 295K = n
0.0227 mol = n
So, to find out the percent yield of the reaction we finally make a rule of three
0.123 moles ___ 100 %
0.0227 moles ____ 18.45 %
If an atom has an electron configuration of 2.8.2, what will it be most likely to bond with? A. One fluorine atom B. Two chlorine atoms C. None of these D. One arsenic atom
Answer:
B. Two chlorine atoms
Explanation:
This electronic configuration shows that the given atom is magnesium.
Electronic configuration of magnesium:
Mg¹² = 1s² 2s² 2p⁶ 3s²
There are two valance electrons of magnesium that's why it would react with two atoms of chlorine. Chlorine is present in seventeen group. It has seven valance electrons. It required just one electron to get complete octet. While magnesium needed to lose two electrons to get complete octet. That's why two chlorine atoms bonded with one magnesium atom. Thus both would get complete octet.
Mg + Cl₂ → MgCl₂
How could you describe an acid based on Arrhenius's theory? A. produces OH⁻ in solution. B. produces H⁺ in solution. C. a proton acceptor. D. a proton donor. E. none of the above
Answer:
B. produces H⁺ in solution.
Explanation:
Arrhenius theory:-
The Arrhenius theory was introduced introduced by Swedish scientist named Svante Arrhenius in 1887.
According to the theory, acids are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a proton or the hydrogen ion, [tex]H^+[/tex].
Base are the substances which dissociate in the aqueous medium to produce electrically charged atoms ( may be molecule). Out of these species furnished, one must be a hydroxide ion, [tex]OH^-[/tex].
Hence, the correct option is:- B. produces H⁺ in solution.
According to Arrhenius's theory, an acid is described as B. produces H⁺ in solution.
Arrhenius defined acids as substances that, when dissolved in water, increase the concentration of hydrogen ions (H⁺) in the solution. This definition is based on the idea that acids dissociate in water to release H⁺ ions, which then combine with water molecules to form hydronium ions (H₃O⁺).
For example, when hydrochloric acid (HCl) is dissolved in water, it dissociates into H⁺ and Cl⁻ ions. The H⁺ ions increase the acidity of the solution. This characteristic is central to the Arrhenius definition of acids, distinguishing them from bases, which are defined by their ability to produce OH⁻ ions in solution.
While other definitions of acids, such as Brønsted-Lowry, describe acids as proton donors, Arrhenius specifically focuses on the increase of H⁺ ions in aqueous solutions.
Element or compound that enters into a chemical reaction undergoes what process
Answer:
Depends on the conditions of reaction.
Explanation:
Any element or compound that enters into a chemical reaction can undergoes any process depending of the conditions of reaction, for example, temperature, pressure, medium, among others.
A chemical reaction is a process in which any substance, element or process undergoes chemical and physical changes.
In chemical reaction we have reactants, that is the innitial or starting elements or compounds; products which are the result of the reaction between the reactants and we might see physical changes.
For example, if we do a reaction betwenn Iron and oxygen:
4Fe + 3O2 --------> 2Fe2O3
Iron and oxygen reacts and creates a new product. This is the iron oxyde, which is a physical change too, and you can see that for a color change.
Depending on conditions, we can have several types of chemical reaction, such as synthesis, decomposition, single displacement, double displacement, equilibrium reactions, acid - base reactions among others.
In a chemical reaction, a reactant undergoes a process where it is converted into a product. The sequence of these steps is called the reaction mechanism. The reaction's rate is determined by the rate of the slowest step in the mechanism.
Explanation:An element or compound that enters into a chemical reaction undergoes a process wherein it is converted into a different substance. This element or compound is called the reactant, and the new substance formed is called the product.
Chemical reactions occur when two or more atoms bond together to form molecules or when bonded atoms are broken apart. The sequence of individual steps by which reactants are converted into products during the course of a reaction is called the reaction mechanism.
The overall rate of a reaction is determined by the rate of the slowest step in its mechanism, called the rate-determining step. Chemical reactions can release or absorb heat, called exothermic and endothermic processes respectively.
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According to atomic theory:
a. the nucleus is positively charged.
b. the nucleus contains both charged and uncharged particles.
c. the electrons contribute very little to the total mass of the atom.
d. the electrons are located in the atomic space outside the nucleus.
e. all of these
Answer:
e. all of these
Explanation:
Let us check all the given options one by one:
a.The nucleus is positively charged.
Yes it is correct since nucleus contain protons and neutrons and protons are positively charged.
b.The nucleus contains both charged and uncharged particles.
Yes because protons are positively charged and neutrons are neutral in nature.
c.The electrons contribute very little to the total mass of the atom.
Yes we know all the mass of the atom is considered in center and mass of electron is negligible as compared to protons and neutrons.
d.The electrons are located in the atomic space outside the nucleus.
Yes, its a known fact.
e. All of these.
Since , all given options are correct .
Therefore , option e. is right .
What type of bonding occurs in a sample of pure barium, Ba? In other words, how is one barium atom held to another barium atom?
Answer:metallic bond
Explanation:
The metallic bond consists of a layer of valence electrons electrostatically attracted to positive metal ions. Hence in a metal such as barium, electrons bind the metal ions together in the metallic crystal lattice of the element.
Binary compounds of alkali metals and hydrogen react with water to produce H2(g). The H2 from the reaction of a sample of NaH with an excess of water fills a volume of 0.500 L above the water. The temperature of the gas is 35 ∘C and the total pressure is 755 mmHg .
Answer: Mass of H2 liberated = 0.039g;
Mass of NaH that reacted = 0.468g
Note: This is the complete question (Binary compounds of alkali metals and hydrogen react with water to liberate H2(g). The H2 from the reaction of a sample of NaH with an excess of water fills a volume of 0.510 L above the water. The temperature of the gas is 35 ∘C and the total pressure is 755mmHg . Find the mass of H2 liberated and the mass of NaH that reacted.)
Explanation:
The equation of the reaction is NaH + H2O ---> NaOH + H2O
molar mass of NaH = 24g, molar mass of H2 = 2g
First, The volume, V1, of the gas produced at standard conditions (s.t.p.) is determined using the general gas equation; P1V1/T1 = P2V2/T2
Making V1 subject of the formula; V1 = P2V2T1/P1T2
P1 = 760mHg, P2 = 755mmHg, V1 = ?, V2 = 0.5L, T1 = 0∘C = 273K, T2 = 35 ∘C = 308K
V1 = 755*0.5*273/(760*308) = 0.44L
1 mole or 22.4L of H2 has a mass of 2g;
mass of 0.44L of H2 = 2*0.44/22.4 = 0.039g
From the equation of the reaction, 2g of H2 is produced by 24g of NaH at s.t. p.
0.039g of H2 will be produced by 0.039*24/2 = 0.468g of NaH
Liam knows that some of the bubbles in his experiment must be oxygen. He draws an atomic model of the element oxygen. What does he include in his drawing? Select all that apply.
Answer:
8 electrons, 8 neutrons and 8 protons
Explanation:
In chemistry, atomic number can be described as the number of protons in an atom. This number is unique to every element present in the periodic table. The atomic number of the element, Oxygen (O), is 8.
An atom of oxygen will have 8 protons in the nucleus, 8 neutrons present in the nucleus as well as 8 electrons which will orbit around the nucleus. The first shell will have 2 electrons whereas the second shell will have 6 electrons.
With roof framing, a(n) ______ is a structural member which supports the roof of the building.
Answer:
Rafter also called roof joist.
Explanation:
In roof framing, a rafter serves as the structural member that supports the building's roof. It is part of a rigid structure that is essential for the stability of the roof. Historically, other elements like engaged columns and buttresses were also used to support and stabilize the building structure.
Explanation:With roof framing, a rafter is a structural member that supports the roof of a building. A rafter is part of a rigid structure formed of relatively slender pieces, which are typically joined together to support the roof. This is critical in roofing as it helps distribute the weight of the roof and ensures the stability of the building.
The history of roof construction shows that the types of construction varied based on the available natural materials. Load-bearing walls played a vital role in supporting the roofs and had to be constructed strong enough not only to support themselves but also the roof. If the roof span was too large, the walls could be pushed out and collapse.
. At 400 K, the half-life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 28.9 kPa, the half-life as 178 s. Determine the order of the reaction.
Answer:
The order of this half-life reaction is zero. This is a zero order reaction.
Explanation:
Step 1: Data given
At the pressure P0,1 of 55.5 kPa, the half-life is 340 s
At the pressure P0,2 of 28.9 kPa, the half-life is 178 s
Step 2: Calculate the order
(n-1) = ((log (t1/2P0,1 / t1/2P0,2)) / (log (P0,2 /P0,1)))
⇒ with t1/2P0,1 = the half-life at a pressure of 55.5 kPa = 340 s
⇒ with t1/2P0,2 = the half-life at a pressure of 28.9 kPa = 178 s
⇒ with P0,1 = the pressure of 55.5 kPa
⇒ with P0,2 = the pressure of 28.9 kPa
(n-1) = (log (340/178)) / log( 28.9/55.5)
(n-1) = log (1.91) / log(0.52)
(n-1) = 0.281 / -0.284
n-1 = -1
n = 0
The order of this half-life reaction is zero. This is a zero order reaction.
Electrostatic forces holds which of the following together?
Answer:
Ar atoms in argon gas
Explanation:
Final answer:
Electrostatic forces, including ionic bonds and the strong nuclear force, hold oppositely charged ions, DNA structures, and atomic nuclei together. These forces are central to the integrity and structure of many physical and biological entities.
Explanation:
The electrostatic force is responsible for holding together various types of structures and compounds in physics and chemistry. For example, an ionic bond is an electrostatic attraction that holds ions together in an ionic compound, such as the ion pairs found in salts like sodium chloride (NaCl). The strength of this bond is contingent on the magnitude of the charges and the distance between the ions. For instance, a cation with a 2+ charge will form a stronger ionic bond compared to a cation with a 1+ charge because the electrostatic force increases with larger charges.
Moreover, classical electrostatics plays a crucial role in molecular biology, particularly in the structure of large charged molecules like proteins and DNA. In the case of DNA, which is highly charged, the electrostatic force not only holds the molecule together but also imparts structural integrity and strength to the double helix.
Lastly, within the atomic nucleus, while electrostatic forces cause repulsion between positively charged protons, the strong nuclear force overpowers this repulsion and holds the protons and neutrons together, preventing the nucleus from disintegrating under electrostatic repulsion.
You and a friend are being chased by a bear. under these conditions levels of epinephrine are increased due to metabolism of which of the following amino acids
Answer:
For producing epinephrine , tyrosine is required .
Explanation:
Epinephrine is produced in adrenal medulla, where the amino acid tyrosine is transformed to norepinephrine. An enzyme known as phenylethanolamine N-methyltransferase catalyzes the methylation of norepinephrine to epinephrine.
When an antimicrobial agent permanently denatures proteins thus preventing renaturation to their native states it is considered: Select one: a. bacteriostatic b. bacterial lysis c. an inhibitor of growth d. bactericidal
Answer:
The correct option is d, bactericidal
Explanation:
Antimicrobial agent that kill bacteria are called bactericidal and hence, prevents the growth of bacteria.
Antimicrobial agent that slows the growth of the bacteria called bacteriostatic.
Bactericidal and bacteriostatic are types of antibiotics.
Bactericidal antibiotics act by inhibiting cell wall synthesis. Penicillin, cephalosporins, vanomycin, etc are some of bactericidal antibiotics.
The last time the atmospheric carbon dioxide level was as high as it is today was _________ years ago.
Answer:The last time levels of atmospheric carbon dioxide were this high came during the Pliocene Epoch, which extended from about 5.3 million to 2.6 million years ago
The amount of nutrients present in the tropic level is called the living state.
The accurate answer is very complicated as the amount of carbon dioxide is changes gradually every day. Therefore the exact date to the same ratio of carbon dioxide is difficult to tell.
In my opinion, the amount of carbon dioxide is high as it if for today is 20 years ago when ozone later starts depleting.
Hence, the correct answer is 20 years ago.
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Can someone help me with this ASAP
Answer:
Correct answer - B
Explanation:
Radioactive decay is the process of in which an unstable atomic nucleus loses energy by emitting ionize particles and radiation transforming the parent nuclide atom into a different atom called daughter nuclide.
Nuclear equation that show the atomic number and mass number of every particle which are involved in the radioactive decay.
The given nuclear reaction is as follows.
[tex]^{11}_{6}C\rightarrow ^{11}_{5}B+^{0}_{1}e[/tex]
Therefore,Correct answer - B
What is the mass of an original 5.60-gram sample of iron-53 that remains unchanged after 25.53 minutes?(1) 0.35g
(2) 1.40 g(3) 0.70 g
(4) 2.80 g
Answer:
(3) 0.70 g
Explanation:
Half life of iron-53 = 8.5167 minutes
[tex]t_{1/2}=\frac {ln\ 2}{k}[/tex]
Where, k is rate constant
So,
[tex]k=\frac {ln\ 2}{t_{1/2}}[/tex]
[tex]k=\frac{ln\ 2}{8.5167}\ min^{-1}[/tex]
The rate constant, k = 0.08138 min⁻¹
Time = 25.53 minutes
Using integrated rate law for first order kinetics as:
[tex][A_t]=[A_0]e^{-kt}[/tex]
Where,
[tex][A_t][/tex] is the concentration at time t
[tex][A_0][/tex] is the initial concentration = 5.60 g
So,
[tex]\frac{[A_t]}{5.60}=e^{-0.08138\times 25.53}[/tex]
[tex][A_t]=\frac{5.6}{e^{2.0776314}}[/tex]
[tex][A_t]=0.70\ g[/tex]
Answer- (3) 0.70 g
Answer:
After 25.53 minutes there will remain 0.70 grams of the iron-53 sample. Option 3 is correct.
Explanation:
Step 1: Data given
Original mass of the original iron sample = 5.60 grams
Half life of iron-53 = 8.5167 minutes
Step 2: Calculate the rate constant
k = (ln 2)/(t1/2)
⇒ with k = the rate constant
⇒ with t1/2 = the half-life time = 8.5167 minutes
k = 0.08139 / min
Step 3: Calculate the mass after 25.53 minutes
At = A0*e^(-kt)
⇒ with At = the amount of iron sample after 25.53 minutes
⇒ A0 = the initial amount of iron sample =5.50 grams
⇒ with k = 0.08139 / min
⇒ with t = the time = 25.53 minutes
At = 5.50*e^(-0.08139*25.53)
At = 0.70 grams
After 25.53 minutes there will remain 0.70 grams of the iron-53 sample
how many grams of CO are needed to react with an excess of fe2o3 to produce 209.7 g fe
Answer:
Amount of CO required is 157.5 g
Explanation:
Molecular mass of Fe = 55.845 g/mol
Amount of Fe = 209.7 g
[tex]Mol\ of\ Fe=\frac{209.7}{55.845} \\=3.75\ mol[/tex]
Balanced reaction of reduction of Fe2O3 is as follows:
[tex]Fe_2O_3(s) + 3CO (g)\rightarrow 2Fe(s)+3CO_2(g)[/tex]
From the balanced reaction, 2 mol of Fe is produced by 3 mol of CO.
Therefore, 3.75 mol of Fe will be produced by,
[tex]\frac{3}{2} \times 3.75 = 5.625\ mol\ CO[/tex]
Relation between mass and mol is as follows:
Mass = Mol × Molecular formula
Molecular mass of CO = 28 g/mol
Grams of CO required = 5.625 mol × 28 g/mol
= 157.5 g
Amount of CO required is 157.5 g.
Answer:
There are 157.8 grams of CO needed.
Explanation:
Step 1: Data given
Mass of Fe produced = 209.7 grams
Molar mass of Fe2O3 = 159.69 g/mol
Molar mass of Fe = 55.845 g/mol
Step 2: The balanced equation
3CO + Fe2O3 → 2Fe + 3CO2
Step 3: Calculate Moles of Fe
Moles Fe = mass Fe / molar mass Fe
Moles Fe = 209.7 grams / 55.845 g/mol
Moles Fe = 3.755 moles
Step 4: Calculate moles of CO
For 3 moles of CO we need 1 mol of Fe2O3 to produce 2 moles Fe and 3 moles of CO2
For 3.755 moles of Fe we need 3.755 *3/2 = 5.6325 moles of CO
Step 5: Calculate mass of CO
Mass CO = moles CO * molar mass CO
Mass CO = 5.6325 * 28.01 g/mol
Mass CO = 157.8 grams
There are 157.8 grams of CO needed.
Recognize the visible part of the electromagnetic spectrum and the relationship between wavelength, frequency, and energy.
The region associated with electromagnetic spectrum which contains light at frequencies and wavelengths that stimulates the rod and cones in the human eye is recognized as the visible region of the electromagnetic spectrum. The eye makes the association with some selected portions of that visible region through color.
Energy is inversely proportional to wavelength and it is directly proportional to the frequency.As the frequency and wavelength are related by a constant (c) we can also write the energy in terms of wavelength by the equation [tex]E = \frac{hc}{\lambda}[/tex].
where h is a Planck's constant,
c is the velocity of the light.
An increase in the ratio of insulin to glucagon will increase the activity of which of the following enzymes (+ indicates activity is increased; - indicates activity is not increased by insulin)?
Answer: An increase in the ratio of insulin to glucagon will increase the activity of --
- Acetyl-CoA carboxylase(+)
-Phosphofructokinase PFK2(+)
-Glycogen synthase(+)
- Hormone sensitive lipase (-). The hormone sensitive lipase activity is not increased with increased insulin activity.
Explanation: increased insulin - glucagon ratio is usually high in fed state.Insulin helps the cells absorb glucose, reducing blood sugar and providing the cells with glucose for energy. When blood sugar levels are too low, the pancreas releases glucagon. Glucagon instructs the liver to release stored glucose, which causes blood sugar to rise.
Drag the correct symbol to the equation. Not all symbols will be used. A plutonium atom undergoes nuclear fission. Identify the missing element in the nuclear equation. 239Pu + 1n ---> ____ + 134Xe + 3 1n 94 0 54 0 Options: 101Zr 40 134Xe 54 105Zr 40 103Zr 40 102Xe 54
Answer:
[tex]_{40}^{103}Zr[/tex]
Explanation:
For any nuclear equation, we should utilize the law of mass conservation and the law of charge conservation. The sum of the masses on the left-hand side of the arrow should be equal to the sum of the masses on the right-hand side of the arrow (those are the superscripts for each nucleus). Similarly, the sums of charges should be equal (this is the law of charge conservation).
Let's say that the missing species is X with a mass of 'M' and charge of 'Z':
[tex]_{94}^{239}Pu+_0^1n\rightarrow _Z^MX+_{54}^{134}Xe+3_0^1n[/tex]
Find mass applying the mass balance law:
[tex]239+1=M+134+3\cdot1\\240 = M+137\\M=240 -137\\M=103[/tex]
This means our particle X has a mass of 103. Let's find the atomic number (the charge) same way:
[tex]94+0=Z+54+3\cdot0\\94=Z+54\\Z=94-54=40[/tex]
The atomic number of our nucleus is 40. That said, we have:
[tex]_{40}^{103}X[/tex]
Find the element in the periodic table with Z = 40. This is Zr. Meaning we can now identify it fully:
[tex]_{40}^{103}Zr[/tex]
How many grams of sucrose would you add to water to make a total of 2.1 L of 9 % solution (mass per volume)? Make your answer's precision to one decimal place.
Answer : The mass of sucrose added to water will be, 189.0 grams.
Explanation :
As we are given that 9 % solution (mass per volume) that means 9 grams of sucrose present in 100 mL volume of solution.
Total given volume of solution = 2.1 L = 2100 mL (1 L = 1000 mL)
Now we have to determine the mass of sucrose in solution.
As, 100 mL of solution contains 9 grams of sucrose
So, 2100 mL of solution contains [tex]\frac{2100mL}{100mL}\times 9g=189.0[/tex] grams of sucrose
Therefore, the mass of sucrose added to water will be, 189.0 grams.
How can you tell the difference between an element and a compound
Explanation:
An Element is one and a compound is more than 2elements
Answer:
The difference between an element and a compound is that an element is a substance made of same type of atoms, whereas a compound is made of different elements in definite proportions. Examples of elements include iron, copper, hydrogen and oxygen. Examples of compounds include water (H2O) and salt (Sodium Chloride - NaCl)
Explanation:
Further Differences:
Defintion:
Compound - A compound contains atoms of different elements chemically combined together in a fixed ratio.
Element - An element is a pure chemical substance made of same type of atom.
Representation:
Compound - A compound is represented using its chemical formula that represents the symbols of its constituent elements and the number of atoms of each element in one molecule of the compound.
Element - An element is represented using symbols.
Composition:
Compound - Compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds. They contain only one type of molecule. Elements that compose the compound are chemically combined.
Element - Elements contain only one type of atom. Each atom has the same atomic number i.e., the same number of protons in their nucleus.
40 POINTS What are chemical formulas? Give an example of a chemical formula. (4 points)
Answer:
A chemical formula tells us the number of atoms of each element in a compound. It contains the symbols of the atoms of the elements present in the compound as well as how many there are for each element in the form of subscripts.
Explanation:
EXAMPLES:
H2SO4 : Sulfuric Acid. CH4 : Methane.
C12H22O11 : Sucrose. C3H8 : Propane.
NaHCO3 : Baking Soda. F : Fluoride. F2 : Fluoride.
H2O2 : Peroxide.
C8H10N4O2 : Caffeine.
C9H8O4 : Aspirin.
Zn(NO3)2 : Zinc. CO : Carbon Monoxide. NaOH : Sodium Hydroxide. ...
CnH2nOn : Sugar.
In which set of elements would all members be expected to have very similar chemical properties? A) O, S, Se B) S, Se, Si C) Na, Mg, K D) Ne, Na, Mg E) N, O, F
Answer: option C) Na, Mg, K
Explanation:
Similar chemical properties are expressed by elements found in the same or close groups. There are Seven (7) groups in the Periodic table.
Of all the options, ONLY sodium Na, Magnesium Mg, and Potassium K, are located in closely together with SODIUM and MAGNESIUM being in the Same period, while SODIUM and POTASSIUM are placed in the same Group 1.
Therefore, Na, My, and K are most similar in chemical properties
Answer:
O,S,Se
Explanation:
Scientists have put forth many types of alternative energy, one of which is nuclear power. Some people believe that nuclear power is dangerous even though it produces a lot of energy and is readily available. How would a scientist in support of nuclear power respond to this statement?
Answer:
With the appropriate security measures nuclear power, as well as other energy sources, can be used safely.
Explanation:
Nuclear energy, as well as other energy sources, can be dangerous if we do not take the appropriate prevention and protection measures. Nuclear power has one of the lowest levels of fatalities per unit of energy generated, as well as low levels of air pollution-related deaths and allows the reduction of carbon dioxide emissions compared to other energy sources. Since its commercialization, in the 70s, the number of nuclear power accidents is very low compared to the number of accidents of other energy sources, having that coal mining is the most dangerous energy activity in history.
I think that without the correct security considerations, all the energy sources can be dangerous, but if we take security measures as using protection barriers, controlling the reactivity of nuclear power plant, making regularly quality and prevention test control, as well as other measures, we can have the benefits of the nuclear power without worrying too much for danger.
Therefore, with the appropriate security measures nuclear power, as well as other energy activities, can be used safely.
I hope it helps you!
Balance the following chemical equation: \text{CH}_ 4 +CH 4 +start text, C, H, end text, start subscript, 4, end subscript, plus \text{O}_ 2 \rightarrow 2 →start text, O, end text, start subscript, 2, end subscript, right arrow \text{CO}_2 +CO 2 +start text, C, O, end text, start subscript, 2, end subscript, plus \text{H}_2\text{O}H 2 O
Balancing the chemical equation CH₄ + O₂ → CO₂ + H₂O involves making sure that the number of atoms for each element is the same on both sides of the equation. The balanced equation is CH₄ + 2O₂ → CO₂ + 2H₂O.
Explanation:To balance the given chemical equation CH₄ + O₂ → CO₂ + H₂O, start by looking at the number of atoms of each type on both sides of the equation. In the case of methane (CH₄), there is one carbon (C) atom and four hydrogen (H) atoms. On the product side, we have one carbon and two hydrogens in water (H2O), and one carbon in carbon dioxide (CO₂). Two waters must be produced to balance the hydrogen on both sides. This alteration however, affects the oxygen balance. Now, there are two oxygen atoms in CO₂ and one in H₂O (total of 4) on the product side. Hence, there should be 2 O₂ molecules on the reactant side. The balanced equation is thus CH₄ + 2O₂ → CO₂ + 2H₂O.
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The balanced equation is CH₄ + 2 O₂ → CO₂ + 2 H₂O.
To balance the chemical equation CH₄ + O₂ → CO₂ + H₂O, follow these steps:
Balance the carbon atoms: There is 1 carbon atom on both reactant and product sides. So carbon is balanced as is.The balanced chemical equation is CH₄ + 2 O₂ → CO₂ + 2 H₂O. Remember, it’s crucial not to alter the chemical formulas, only the coefficients in front of them to balance the equation.
How many grams of sucrose would you add to water to make a total of 2.4 L of 14 % solution (mass per volume)? Make your answer's precision to one decimal place
Answer:
336.0 g
Explanation:
The definition of concentration by percentage in mass per volume can be expressed as:
% m/v = mass Sucrose (in g) / Volume of Solution (in mL) * 100
The problem gives us the concentration and the volume, so we solve for grams of sucrose:
2.4 L ⇒ 2.4 * 1000 = 2400 mL
14 % = mass Sucrose / 2400 mL * 100
mass Sucrose = 336.0 g
Chemical agents that can occur as by-products of industrial pollution and be consumed by humans are __________.
Answer:
Polychlorinated Biphenyls.
Explanation:
Polychlorinated Biphenyls are man-made chemicals. They are solids, and oily liquid in structure with no taste or small, yellow to clear in color. PCBs are present as a mixture, and very stable at an extreme pressure, and temperature. Basically they are used in electrical equipment such as transformers, and capacitors. High level of PCBs can cause broad spectrum of effects in humans, for example:
1) Increase some liver enzyme level, and cause hepatic damage.
2) Respiratory problems.
3) Dermal lesions.
How much does the air weigh within a column that is 1 square inch in area that extends from sea level all the way to the top of the atmosphere?
Answer:
14.7 lbs
Explanation:
Air pressure is the weight of the air above us. It is approximately 14.7 pounds or lbs per square inch at sea level. It means that an air column weights 14.7 lbs, 1 square inch in diameter, reaching all the way up to the top of the atmosphere.
Answer:
1.03
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A diver exhales a bubble with a volume of 250 mL at a pressure of 2.4 atm and a temperature of 15 °C. What is the volume of the bubble when it reaches the surface where the pressure is 1.0 atm and the temperature is 27 °C? A. 630mLB. 110 mLC. 580 mLD. 1100 mLE. 100 mL
Answer:
A. 630mL
Explanation:
The combined gas law says:
P₁V₁/T₁ = P₂V₂/T₂
Where P₁ is 2,4 atm; V₁ is 250mL; T₁ is 15+273,15 = 288,15K; P₂ is 1,0 atm; V₂ is the final volume; T₂ is 27°C; 27+273,15 = 300,15K.
Thus:
2,4atm×250mL/288,15K = 1,0atm×V₂/300,15K
V₂ = 625mL ≈ A. 630mL
I hope it helps!
Answer:
[tex]\large \boxed{\text{A. 620mL}}[/tex]
Explanation:
We can use the Combined Gas Laws to solve this problem
Data
p₁ = 2.4 atm; p₂ = 1.0 atm
V₁ = 250 mL; V₂ = ?
T₁ = 15°C; T₂ = 27 °C
Calculations
(a) Convert the temperatures to kelvins
T₁ = (15 + 273.15) K = 288.15 K
T₂ = (27 + 273.15) K = 300.15 K
(b) Calculate the new volume
[tex]\begin{array}{rcl}\dfrac{p_{1}V_{1} }{T_{1}} & = & \dfrac{p_{2}V_{2}}{T_{2}}\\\\\dfrac{\text{2.4 atm $\times$ 250 mL}}{\text{288.15 K}} & = & \dfrac{\text{1.0 atm} \times V_{2}}{\text{300.15 K}}\\\\\text{2.08 mL} & = & \dfrac{V_{2}}{300.15}\\\\V_{2} & = & \textbf{620 mL}\\\end{array}\\\text{The volume of the bubble when it reaches the surface is $\large \boxed{\textbf{620 mL}}$}[/tex]