Answer: The correct option is,
A. [tex]5.0\times 10^3[/tex]
Explanation:
Given expression,
[tex](2.5\times 10^{10})\times (2.0\times 10^{-7})[/tex]
[tex]=2.5\times 2.0\times 10^{10-7}[/tex]
( By using product property of exponent i.e. [tex]a^m\times a^n = a^{m+n}[/tex] )
[tex]=5.0\times 10^3[/tex]
Therefore,
OPTION A is correct.
Is so2 a formula unit
Answer:
The molecular formula for Sulfur Dioxide is SO2. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur Dioxide, or 64.0638 grams.
So yes it is a unit
Explanation:
Match the name of the following compound:
MgSO4 · H2O
Magnesium sulfate monohydrate
Magnesium (II) sulfate monohydrate
Magnesium (II) sulfate hydrate
Magnesium sulfate hydrate
Answer:
number 2 is the answer my friend said
Explanation:
Answer:
Magnesium sulfate monohydrate
Explanation:
The compound is a salt, we have a metal connected to an ion.
To name a salt, first of all, we put the name of the cation, which is the first elemental in the compound. It is followed by the name of the anion.
In this case, the cation is the Magnesium and the anion is the anion sulfate. When the cation can have more than one oxidation number, we need to put this number in parenthesis, like this:
Iron (II) sulfate (FeSO4)
Iron (III) sulfate (Fe2(SO4)3)
However, magnesium can only have 2 as oxidation number, because it's from family 2 in the periodic table. So it's unnecessary to put this information.
As the salt has water in its structure, it's a hydrated salt, and this information needed to be in its name. Because it has only one molecule of water, we put the name monohydrate.
hat is the best way to compare a concentrated solution to a dilute solution, given the same volume of solution?
Answer:
Using the molarity of the solution
Explanation:
The concentration of the two solutions can be compared by the use of the number of moles of solute present in each of the solutions. The solution with a higher molarity will be concentrated while the solution with a lower molarity will be dilute.
To compare concentrated and dilute solutions, one looks at the amount of solute in relation to the solvent for the same volume. Calculation of the new concentration after dilution can use the [tex]M_1 \times V_1 = M_2 \times V_2[/tex] equation, applying to stock solutions to reach desired dilutions.
To compare a concentrated solution to a dilute solution while maintaining the same volume, one should examine the ratio of solute to solvent present in the solution. A concentrated solution has a higher concentration of solute, meaning there is a large amount of solute relative to the solvent.
On the other hand, a dilute solution contains a smaller amount of solute hence a lower concentration. This concept can be analogous to the process of making juice from concentrate; you add water to the concentrated juice, thereby increasing the volume while reducing the solute-to-solvent ratio.
When performing calculations, you can use the dilution equation [tex]M_1 \times V_1 = M_2 \times V_2[/tex], where M represents molarity and V represents volume, to determine the new concentration after dilution. For instance, if you have 100 mL of a 2.0 M HCl and dilute it to 500 mL, you can calculate the new molarity ([tex]M_2[/tex]) by applying this equation.
The methodology of dilution typically involves taking a measured volume of a stock solution and adding solvent to reach the desired concentration. This process of diluting adjusts the ratio of solute to solvent, creating a solution of lesser concentration.
Element J is 1s 2s 2p 3s . (i) How many unpaired electrons does J have?
(II) is j a good oxidizing agent or a reducing agent?
(III) state reason for the answer.
Answer:6
Explanation:
3+3
Element J has two unpaired electrons and is likely to be a reducing agent since it can easily lose its single 3s electron.
The electron configuration for element J is understood as 1s² 2s² 2p⁴ 3s₁. To determine how many unpaired electrons it has, we can look at the configuration and see there must be two in the 2p orbital since it can hold up to a maximum of six electrons and there is only four present, thus two are unpaired.
(i) Element J has two unpaired electrons.
(ii) As for it being an oxidizing agent or a reducing agent, elements that easily lose electrons tend to be good reducing agents.
(iii) Given that element J readily loses its single 3s electron and has a high ionization energy, it is likely to be a reducing agent, similar to how sodium reacts with oxygen to release energy and oxidize.
what is the primary purpose of a rate law
Answer:
The rate law or rate equation for a chemical reaction is an equation that links the reaction rate with the concentrations or pressures of the reactants and constant parameters. For many reactions the rate is given by a power law such as.
Explanation:
The other person Goggled it. So, pick me as Brainliest.
The primary purpose of a rate law is to provide a mathematical framework that links the rate of a chemical reaction to the concentration of its reactants.
The primary purpose of a rate law is to provide a mathematical expression that describes the relationship between the rate of a chemical reaction and the concentration of its reactants. Through rate laws, scientists can calculate expected yields, determine optimum conditions for economic chemical processes, and understand the course of individual reactions. The derivation of rate laws is essential as they are not directly obtained from chemical equations for ordinary reactions but rather determined from experimental data involving the measurement of concentrations over time.
To ascertain a rate law, the method of initial rates is commonly employed. This involves conducting experiments under varying reactant concentrations and measuring the reaction rates to deduce the reaction order and rate constant. These parameters are indispensable for formulating a rate law, which in turn allows for the calculation of reaction rates under different conditions and aids in the identification of the reaction mechanism.
Which of the following hydrocarbons will most likely be found around cows? A. ethane B. methane C. octane D. decane
Answer:B
Explanation:I know for a fact Its BAnswer:
Methane
Choice B is correct
Explanation:
Methane is a key byproduct of the bacterial breakdown in the gut.
Therefore, Methane is most likely to be found around cows
11) If 352 moles of butane (CH) is mixed with 8.47 moles of oxygen gas, how many grams of water will be produced?
2C,H,0 + 130, 800, + 10 H,0 (balanced)
Answer:
117 g
Explanation:
We are given the amounts of two reactants, so this is a limiting reactant problem.
1. We know we will need an equation with masses and molar masses, so let’s gather all the information in one place.
M_r: 63.55 32.00 18.02
2C₄H₁₀ + 13O₂ ⟶ 8CO₂ + 10H₂O
n/mol: 352 8.47
2. Calculate the amount of water that each reactant can produce
(a) From C₄H₁₀
Moles of H₂O = 352 mol C₄H₁₀ × (10 mol H₂O/2 mol C₄H₁₀) = 704 mol H₂O
(b) From O₂:
Moles of H₂O = 8.47 mol O₂ × (10 mol H₂O/13 mol O₂) = 6.515 mol H₂O
3. Identify the limiting reactant
The limiting reactant is O₂, because it gives fewer moles of H₂O.
4. Calculate the mass of water
Mass of H₂ = 5.515 mol H₂O × (18.02 g H₂)/(1 mol H₂O) = 117 g H₂O
The reaction produces 117 g H₂O.
Calculate the molarity of the solution.
6.02 x 1022 molecules of HCI (molecular weight = 36.5 g/mole) in 2.0 liters of water
M
Answer:
ans. is 0.05
Explanation:
molarity=(mole of solute)/(litre of solution)
Answer:
The molarity of the solution is 0.05 [tex]\frac{moles}{L}[/tex]
Explanation:
Molarity (M) is the number of moles of solute that are dissolved in a given volume.
Molarity is determined by the following expression:
[tex]Molarity (M)=\frac{number of moles of solute}{dissolution volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Then you should know the amount of moles of HCL. For that you should know that:
The Avogadro Number or Avogadro Constant is called the number of particles that constitute a substance (usually atoms or molecules) and that can be found in the amount of one mole of that substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number applies to any substance.
Therefore, applying a rule of three, 6.02*10²² molecules correspond to:
[tex]moles=\frac{6.02*10^{22}*1mole }{6.023*10^{23} }[/tex]
moles=0.1 moles of HCl
Applying the definition of molarity:
[tex]M=\frac{0.1 moles}{2 L}[/tex]
M= 0.05 [tex]\frac{moles}{L}[/tex]
The molarity of the solution is 0.05 [tex]\frac{moles}{L}[/tex]
What is the boiling point in degrees Celsius of water
Answer:
100 degree celsius
Explanation:
Which statement about enzymes is true
Answer:
whats the statment sis
Explanation:
Which type of graph would best to represent a budget?
Answer:
Line or a bar graph
Explanation:
Answer:
I'm pretty sure it's the pie chart
Explanation:
A circle is centered at the point (5, -4) and passes through the point (-3, 2). The equation of this circle is (x + )2 + (y + )2 = . Reset
Answer:
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
Explanation:
We have been given the center of the circle as (5, -4) and a point on the circumference as (-3, 2). We first determine the radius of the circle. The radius is the distance from the center to any point on the circumference. Using the distance formula, we have;
[tex]radius=\sqrt{(5--3)^{2}+(-4-2)^{2}}\\radius=\sqrt{64+36}=10[/tex]
The radius of the circle is thus 10 units.
The equation of a circle with center (a,b) and radius r units is given as;
[tex](x-a)^{2}+(y-b)^{2}=r^{2}[/tex]
Plugging in the values given we have;
[tex](x-5)^{2}+(y+4)^{2}=100[/tex]
Which sentence from Holes contains an implied personality trait?
Stanley and his parents had tried to pretend that he was just going away to camp for a while, just like rich kids do.
He'd just been in the wrong place at the wrong time.
Stanley felt somewhat dazed as the guard unlocked his handcuffs and led him off the bus.
Stanley nodded to show he understood
Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
Although the excerpt from Holes is missing from your question an answer is provided based on the principle of implied personality trait
An implied personality trait is used to describe the character of a person based on his actions and thought. also implied personality trait are used to make inferences about an individual.
As seen in the sentence " Stanley and his parents had tried to pretend that he was just going away like rich kids do " the inference /conclusion contained in this sentence is that Stanley and his parents are pretending
Hence we can conclude that ; Stanley and his parents had tried to pretend that he was just going away like rich kids do ( A ) is an implied personality trait
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Which of the following represents the ester functional group?
A. -COO-
B. -CHO
C. -COOH
D. C=O
Answer:
D. C=O
Explanation:
Esters are formed by the condensation of alcohols and acids with minus water. During the reaction, at least one -OH group is replaced by an O- alkyl group. The resulting compound is an ester and has a characteristic fruity smell. Its functional group is C=O
Answer: A. -COO-
Explanation:
Functional groups are specific group of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules.
A. Esters have functional group [tex]-O=C-OR[/tex].
Example: methyl ethanoate with molecular formula [tex]CH_3COOCH_3[/tex]
B. Aledydes have functional group [tex]-O=CH[/tex].
Example: Ethanal with molecular formula [tex]CH_3CHO[/tex]
C. Acids have functional group [tex]-O=C-OH[/tex].
Example: Ethanoic acid with molecular formula [tex]CH_3COOH[/tex]
D. Ketones have functional group [tex]-C=O[/tex].
Example: Propanone with molecular formula [tex]CH_3COCH_3[/tex]
Which is the most likely way an automotive engineer would use chemistry
Final answer:
An automotive engineer would most likely use chemistry to design and improve automobile catalytic converters, ensuring efficient combustion and reduced toxic emissions. They also work on reformulating gasoline to meet environmental standards and improve engine performance.
Explanation:
The most likely way an automotive engineer would use chemistry is through the design and development of automobile catalytic converters. Scientists have engineered catalytic converters to significantly reduce the toxic emissions resulting from gasoline burned in internal combustion engines. By implementing a blend of catalytically active metals, these converters facilitate the complete combustion of carbon-containing compounds into carbon dioxide, while also diminishing the output of nitrogen oxides.
Another aspect of chemistry in automotive engineering involves the reformulation of gasoline. Removing substances like tetraethyllead, which hampers exhaust catalysts, and decreasing the presence of highly volatile and unsaturated hydrocarbons are critical to reduce photochemical smog and increase engine efficiency.
Which of the following is a testable hypothesis?
A. If I brush my teeth, I will get fewer cavities than if I don't brush my
teeth.
B. Green toothpaste tastes better than blue toothpaste or red
toothpaste.
C. Smart, careful, healthy people always brush their teeth.
D. It's wrong to not brush your teeth before you have an important
conversation with someone.
Answer:
If I brush my teeth, I will get fewer cavities than if I don't brush my teeth.
Explanation:
apex
Which of the following is the best name for a compound made from calcium and bromine? (CaBr2) calcium bromide calcium dibromide monocalcium dibromide calcium bromine II
Answer:
Calcium bromide
Explanation:
When naming compounds, the use of prefixes depend on the type of bond made. In this case, calcium and bromine form a ionic bond because calcium is a metal and bromine is a non-metal.
Ionic bonds are not named using prefixes. So no matter how many atoms there are, you will simply write the name of the element for the first element.
For the second element, you name it as well, but only use the root name and end it with -ide.
18.A 2.50 L sample of dry air in a cylinder exerts a pressure of
3.00 atm at a temperature of 25 C. The cylinder is reduced to
1.00 atm. What is the volume of the gas without a change in
temperature?
Answer:
[tex]\boxed{\text{7.50 L}}[/tex]
Explanation:
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rclrcl}p_{1}& =& \text{3.00 atm}\qquad & V_{1} &= & \text{2.50 L} \\p_{2}& =& \text{1.00 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculations:
[tex]\begin{array}{rcl}3.00 \times 2.50 & =& 1.00V_{2}\\7.500 & = & 1.00V_{2}\\V_{2} & = &\textbf{7.50 L}\\\end{array}\\\text{The volume of the gas is } \boxed{\textbf{7.50 L}}[/tex]
Using Boyle's law, which states that pressure and volume are inversely related at a constant temperature, we find that the volume of the dry air sample increases to 7.50 L when the pressure is reduced to 1.00 atm.
Explanation:The question you asked involves the property of gases described by Boyle's law. This law states that at a constant temperature, the pressure and volume of a gas are inversely proportional. In other words, if the pressure of a fixed amount of gas is decreased, its volume will increase accordingly, assuming the temperature remains the same.
To find the new volume of the gas, we can use the formula P1V1 = P2V2, where P1 is the initial pressure, V1 is the initial volume, P2 is the final pressure, and V2 is the final volume we're looking for. We know that P1 = 3.00 atm, V1 = 2.50 L, and P2 = 1.00 atm. Plugging these values into the equation, we get: 3.00 atm * 2.50 L = 1.00 atm * V2. Solving for V2, we find that V2 = 7.50 L. So, the volume of the gas after reducing the pressure to 1.00 atm, without changing the temperature, is 7.50 L.
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what tool did Maurice use when studying dna???
Answer:
He used the X-ray tool
Explanation:
Answer:
a x ray
Explanation: mark me brainliest plzzz
How will the rate at which a solid solute dissolves change if the solution is stirred?
The rate at which the solute dissolves will stay the same.
The rate at which the solute dissolves will increase.
The rate at which the solute dissolves will decrease.
The rate at which the solute dissolves will fluctuate.
Answer:
The rate at which the solute dissolves will increase.
Explanation:
If a solution is stirred, the rate at which a solute dissolves would increase substantially provided the solution is not yet saturated.
Stiring would cause more of the solution to come in contact with every part of the solute. It will increase the surface area of contact for the solution to act which will shoot up the rate of reaction. Stiring helps to bring solutes in solutions into a more close contact with the molecules or compounds of the medium.
8. What happens to matter during a chemical reaction
Answer: A new substance(product) is made from different elements(reactants) joined by chemical bonds
Explanation: To have a chemical reaction the chemical properties must change. Atoms are never created or destroyed during chemical reaction but at least one chemical bond is broken or formed. Evidence of a chemical change include: change of odor, change of color (for example, silver to reddish-brown when iron rusts), and change in temperature or energy, such as the production (exothermic) or loss (endothermic) of heat.
A chemical company produces ammonia using the following reaction:
N2 + 3H2 → 2NH3
They run a reaction meant to fill an order for a customer who would like to purchase 500.0g of ammonia. When the reaction is complete, the company finds they produced only 430.0g of ammonia. What it their percent yield for that reaction?
70.00%
86.00%
116.3%
93.00%
HELPPP PLEASE
Answer:
[tex]\boxed{\text{ 86.00\,\%}}[/tex]
Explanation:
[tex]\text{\% yield} = \dfrac{\text{actual yield}}{\text {theoretical yield}} \times\text{100 \%}[/tex]
Data:
Actual yield = 430.0 g
Theoretical yield = 500.0 g
Calculation:
[tex]\text{\% yield} = \dfrac{\text{430.0 g}}{\text {500.0 g}} \times\text{100 \%} = \boxed{\text{86.00 \%}}[/tex]
Which of these is the result of scientific research and not engineering?
A. A new shoe design that features air cushioning for more comfort
and protection
B. The creation of glass with UV protection.
C. A conclusion about diet commonalities among diabetics.
D. The development of a smaller, more compact missile.
Answer:C
Explanation: This is because you did research to find the conclusion, but a new object/invention for the other ones.
Answer:
c. a conclusion about diet commonalities among diabetics.
Explanation:
how many moles of oxygen react with 12 moles of aluminum
Answer:
If, for example, we want to know how many moles of oxygen will react with 17.6 mol ... Write the balanced chemical reaction for the combustion of C 5H 12
Explanation:
Complete the following statements to describe
solids,
liquids, and gases. Select the correct answer from each drop-down menu.
A solid
a definite volume and
a definite shape.
A liquid
a definite volume and
a definite shape.
A gas
a definite volume and
a definite shape
Answer : The correct option is,
A solid : a definite volume and a definite shape.
Explanation :
As we know that there are 3 states of matter :
Solid state : It is defined as a state in which the particles are closely packed and does not have any space between them. This state have a definite shape and volume. For example : iron metal
Liquid state : It is defined as a state in which the particles are present in random and irregular pattern. The particles are closely arranged but they can move from one place to another. This state have a definite volume but does not have a fixed shape. For example : water
Gaseous state : It is defined as a state in which the particles are loosely arranged and have a lot of space between them. This state have indefinite volume as well as shape. For example : Any type of gas like, helium gas.
Hence, the correct answer is, a solid has a definite volume and a definite shape.
How many atoms are in 2 mol of Iron
Answer:
It is equal to Avogadro's number (NA), namely 6.022 x1023. If we have one mole of water, then we know that it will have a mass of 2 grams + 16 grams = 18 grams. Since we only have 0.001 grams, that means that we have NA * = 3.35*1019 molecules of water!
Explanation:
I'm just smart.
15 points!!!
describe the characteristics of a molecule of ammonia (NH3). the lewis structure and table of electronegative are given.
the bond polarities are BLANK, the molecular shape is BLANK 2, and the molecule is BLANK 3.
blank 1 options: nonpolar, polar
blank 2 options: bent, linear, tetrahedral, trigonometry planar, trigonal pyramidal.
Blank 3 options: nonpolar, polar
each blank has one option.
Answer:
The bond polarities are polar, the molecular shape is trigonal pyramidal, and the molecule is polar.
Explanation:
y =‐1x + 7 If y has a value of ‐24 what is the value of x?
Answer:
x = 31
Explanation:
-24 = -1x + 7
subract 7 from both sides.
-31 = -1x
divide both sides by -1
31 = x
Calculate number of CO2 molecules in 0.250 mol of co2
This calculation yields 1.506 × 10²³ molecules of CO₂.
Calculating the Number of CO₂ Molecules in 0.250 mol of CO₂
To determine the number of CO₂ molecules in 0.250 mol of CO₂, we can use Avogadro's number, which is the number of particles (atoms, molecules, ions, etc.) in one mole of a substance.
Step-by-Step Explanation:
Avogadro's number is 6.022 × 10²³ molecules/mol.
We are given 0.250 mol of CO₂.
Multiply the number of moles by Avogadro's number to find the number of molecules:
Calculation:
0.250 mol × 6.022 × 10²³ molecules/mol
= 1.506 × 10²³ molecules
Therefore, there are 1.506 × 10²³ molecules of CO₂ in 0.250 mol of CO₂.
How has the scientific community addressed the safety of chemicals?
A. Chemicals are repeatedly tested, even those that have existed for
a long time.
B. Existing chemicals are tested if they have never been tested
before.
c. Chemicals are tested if they are suspected to have caused a
problem.
D. Only new chemicals are tested.
Answer:
A
Explanation:
Chemicals are repeatedly tested, even those that have existed for
a long time.