Glycerol is a subunit molecule of a
a. carbohydrate.
b. nucleic acid.
c. lipid.
d. protein
If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?
A) N2
B) NBr3
C) NaOH
D) HOBr
Answer:
The correct answer is option B.
Explanation:
[tex]3NaOH+2NBr_3\rightarrow 3HOBr+3NaBr+N_2[/tex]
Moles of [tex]NBr_3[/tex] = 40 mol
Moles of NaOH = 48 mol
According to reaction, 3 moles of NaOH reacts with 2 moles [tex]NBr_3[/tex]
Then ,48 moles of NaOH will reacts with:
[tex]\frac{2}{3}\times 48 mol=32 mol[/tex] of [tex]NBr_3[/tex]
Then ,40 moles of [tex]NaBr_3[/tex] will reacts with:
[tex]\frac{3}{2}\times 40 mol=60 mol[/tex] of NaOH
As we can see that 48 moles of sodium will completey react with 32 moles of nitrogen tribromide.
Moles left after reaction = 40 mol - 32 mol = 8 mol
Hence, the [tex]NBr_3[/tex] is an excessive reagent.
Answer : The correct option is (B) [tex]NBr_3[/tex]
Solution : Given,
Moles of [tex]NBr_3[/tex] = 40 mol
Moles of [tex]NaOH[/tex] = 48 mol
Now we have to calculate the limiting and excess reagent.
The balanced chemical reaction is,
[tex]2NBr_3+3NaOH\rightarrow N_2+3NaBr+3HOBr[/tex]
From the balanced reaction we conclude that
As, 3 mole of [tex]NaOH[/tex] react with 2 mole of [tex]NBr_3[/tex]
So, 48 moles of [tex]NaOH[/tex] react with [tex]\frac{48}{3}\times 2=32[/tex] moles of [tex]NBr_3[/tex]
From this we conclude that, [tex]NBr_3[/tex] is an excess reagent because the given moles are greater than the required moles and [tex]NaOH[/tex] is a limiting reagent and it limits the formation of product.
Excess moles of [tex]NBr_3[/tex] = 40 - 32 = 8 moles
Hence, the correct option is (B) [tex]NBr_3[/tex]
Which of the following groups consists of reactive p-block elements?
a. group 1a
c. group 8a
b. group 2a
d. group 3a
If one meter equals 100 million years than what does 1 cm equal to?
To complete the following chemical equation, what coefficients must be added? _____ Cu(OH)2 + _____ H3PO4 yields _____ Cu3 (PO4)2 + _____ H2O
Answer:
3, 2, 1, 6
Explanation:
The unbalanced combustion reaction is shown below as:-
[tex]Cu(OH)_2+H_3PO_4\rightarrow Cu_3(PO_4)_2+H_2O[/tex]
On the left hand side,
There are 1 copper atom and 1 phosphorus atom
On the right hand side,
There are 3 copper atoms and 2 phosphorus atoms
Thus,
Left side, [tex]Cu(OH)_2[/tex] must be multiplied by 3 and [tex]H_3PO_4[/tex] by 2 so to balance copper phosphorus atoms.
[tex]3Cu(OH)_2+2H_3PO_4\rightarrow Cu_3(PO_4)_2+H_2O[/tex]
Left side, 12 H, so [tex]H_2O[/tex] must be multiplied by 6.
Thus, the balanced reaction is:-
[tex]3Cu(OH)_2+2H_3PO_4\rightarrow Cu_3(PO_4)_2+6H_2O[/tex]
How many grams are in 5.6 moles of C6H6
To determine the mass of 5.6 moles of C6H6, calculate the molar mass of benzene (78.108 g/mol) and multiply it by the number of moles, resulting in 437.405 grams.
Explanation:To calculate the mass of 5.6 moles of C6H6 (benzene), we start with determining the molar mass of C6H6. We do this by adding the molar masses of all the atoms present in the molecule:
Carbon (C) has a molar mass of about 12.01 g/mol, and since there are 6 carbon atoms in C6H6, we have 6 x 12.01 g/mol = 72.06 g/mol for carbon.Hydrogen (H) has a molar mass of about 1.008 g/mol, and with 6 hydrogen atoms in C6H6, we have 6 x 1.008 g/mol = 6.048 g/mol for hydrogen.Adding these together gives us the molar mass of C6H6: 72.06 g/mol + 6.048 g/mol = 78.108 g/mol.
Now, to find the number of grams in 5.6 moles of C6H6, we use the following calculation:
5.6 moles x 78.108 g/mol = 437.405 g
Therefore, 5.6 moles of C6H6 weigh 437.405 grams.
Which atomic model was proposed as a result of J. J. Thomson’s work?
the plum pudding model
the indivisible atom model
an atom that had a lot of empty space
an atom that had a concentrated nucleus
Answer: Option (a) is the correct answer.
Explanation:
J.J. Thomson is a renowned scientist who discovered the model of atom which is known as the plum pudding model.
Through this model Thomson stated that an atom consists of small particles. These small particles are positive and negative charges present inside an atom.
Whereas Democritus stated that an atom is indivisible and thus he proposed the indivisible atom model.
Ernest Rutherford discovered that an atom has lot of empty space and this space is nucleus. As he stated that positively charged particles are known as protons which are present inside a nucleus.
Rutherford's gold foil experiment discovered that an atom has nucleus in which most of the mass of an atom is concentrated.
Thus, we can conclude that the plum pudding model was proposed as a result of J. J. Thomson’s work.
What is hydrogen bond??
A hydrogen bond is one of the intermolecular forces and it's a bond between two molecules where hydrogen in one molecule is connected to or attached to either oxygen, fluorine, or nitrogen in another molecule.
What is the correct representation for the subshell with n = 2 and l = 1?
Answer:
2p
Explanation: i just answered this question and it was right
What is the oxidation number of Nitrogen in HNO2?
+1
-1
+3
-3
The oxidation number of Nitrogen in HNO2 is +3. This is determined using the fact that oxygen has an oxidation number of -2, and hydrogen has an oxidation number of +1 in the compound.
Explanation:The oxidation number of Nitrogen in HNO2 (nitrous acid) is +3. When determining oxidation states, we use the rule that oxygen normally has an oxidation number of -2. Since there are two oxygen atoms in nitrous acid, their combined oxidation number is -4. Knowing hydrogen has an oxidation number of +1, we can set up an equation to find the oxidation state of nitrogen (N) in HNO2. Let x represent the oxidation number of nitrogen:
H (+1) + N (x) + 2 O (-2 each) = 0 (since the compound is neutral)
1 + x - 4 = 0
x - 3 = 0
x = +3
Therefore, the oxidation number of nitrogen in HNO2 is +3, which corresponds to one of the given options.
A fluorine atom has 9 positive charge,9 negative charges and a mass of 19. Describe the structure of its atom.
Help please.....I don't understand how do I have to describe the structure of the atom...
In terms of the number of valence electrons, describe one cyclic property that can be observed in the model.
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 16.8g of carbon were burned in the presence of 59.9g of oxygen, 15.1g of oxygen remained unreacted. What mass of carbon dioxide was produced?
Which of the following processes is most likely to multiply exponentially?
A. An uncontrolled nuclear chain reaction
B. A controlled nuclear chain reaction
C. Nuclear fusion
D. Nuclear decay
Answer: -
A. An uncontrolled nuclear chain reaction is most likely to multiply exponentially.
Explanation: -
An nuclear chain reaction produces neutrons. These neutrons then can start new nuclear fissions. In a controlled nuclear fission, the number of neutrons allowed to start new fission is controlled.
In an uncontrolled reaction, the neutrons start fission very fast. These also start new nuclear fission, releasing more neutrons.
Thus. An uncontrolled nuclear chain reaction is most likely to multiply exponentially.
Answer:A
Explanation:
How can I tell how many neutrons there are in an element
Why does the boiling point of a liquid vary with atmospheric pressure?
The boiling point of a liquid changes with atmospheric pressure because it is the temperature at which the liquid's vapor pressure equals the surrounding pressure.
The boiling point of a liquid varies with atmospheric pressure due to the relationship between vapor pressure and temperature. Vapor pressure is the pressure exerted by the vapor of the liquid in equilibrium with its liquid phase.
As temperature increases, so does vapor pressure, until it equals the surrounding environmental pressure, which is the boiling point. The normal boiling point of a liquid is defined as the temperature at which the vapor pressure equals 1 atm (101.3 [tex]kP_a[/tex]).
Since atmospheric pressure changes with altitude, the boiling point of a liquid also changes. For example, water boils at a lower temperature at higher altitudes due to reduced atmospheric pressure.
The atoms and molecules in a liquid are in constant motion. As temperature decreases, what is true of the particles in the liquid?
the rate of particle movement decreases
the distance between the particles decreases
the attraction between the particles decreases
the potential energy of the particles decreases
Answer: the rate of particle movement decreases.
Explanation:
1) Heat energy or just heat is the kinetic energy of particles (molecules) transferred from a warmer substance (liquid, solid or gas) to a cooler one.
2) Temperature is a measure of the kinetic energy of the particles (molecules) in a substance.
The higher the temperature the higher the kinetic energy; the lower the kinetic energy the lower the temperature.
This is stated by this equation: Average kinetic energy = [3/2]K T.
4) You also must know that kinetic energy is the energy related to motion (speed) according to the equation:
Kinetic energy = [1/2]mass×(speed)².
Therefore, from the two equations, using transitivity property, you see that the lower the temperature the lower the speed, which is what lets you to conclude that as temperature decreases in the liquid the rate of particle movement decreases.
A fish is removed from a contaminated lake. You determine that a particular toxin (X) is present in its cells at concentration X = 1,500 μg/L. You place the fish in a tank full of clean water (X = 0 μg/L), and measure the toxin concentration in the fish cells each day for the next 10 days.
After making your hypothesis, you test it by measuring the toxin levels in the fish at various times during its 10 days in the tank. You observe that the level of toxin in the fish drops from 1,500 μg/L to 750 μg/L and then stabilizes at 750 μg/L. You test the water in the tank and find that after it stabilizes, toxin is present in the water at concentration 750 μg/L also. What can you do to continue to reduce the toxin level in the fish below 750 μg/L?
Perform regular water changes and maintain a clean tank environment to reduce the toxin level in the fish below 750 μg/L.
Explanation:To continue to reduce the toxin level in the fish below 750 μg/L, one option is to perform a water change in the tank. By regularly replacing a portion of the tank water with clean, toxin-free water, the overall concentration of the toxin in the tank will decrease, which can then help lower the toxin level in the fish's cells. Another option is to use activated carbon or other filtration systems in the tank to absorb the toxin from the water.
Besides these actions, it's crucial to monitor and ensure the water in the tank remains clean. This includes maintaining proper filtration, regular water testing, and addressing any sources of contamination. By preventing recontamination and providing a clean environment, the toxin level in the fish can be further reduced.
In summary, to continue reducing the toxin level in the fish below 750 μg/L, performing regular water changes and maintaining a clean tank environment are essential steps.
Learn more about Toxin level reduction here:https://brainly.com/question/32478139
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what is the formula for hydrogen-hydrogen?
[tex]\sf\large{H - H}[/tex]
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Anne adds granulated sugar to water and stirs it until all the sugar dissolves, leaving a sweet, transparent liquid. Under which category should she classify that liquid?
a) solution
b) compound
c) suspension
d) colloid
the answer should be a) solution , a solution is the term used for when two substances that is combined but does not chemically make a third substance .
Which gas is the most abundant of the trace gases?
Which statement correctly describes the phosphate ion, PO3-/4?
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion.
It is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge on the phosphorus atom.
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge distributed over the entire ion.
It is composed of one phosphorus atom and four oxygen atoms ionically bonded together, and there is a –3 charge on the phosphorus atom.
B is not the correct answer. The -3 charge is distributed over the entire ion, so the correct answer is A.
Final answer:
The correct description of the phosphate ion, PO43-, is that "it consists of one phosphorus atom and four oxygen atoms covalently bonded, with a –3 charge spread over the entire ion". The phosphorus has five valence electrons and phosphates form through covalent bonds.
Explanation:
The correct statement describing the phosphate ion, PO43-, is that it is composed of one phosphorus atom and four oxygen atoms covalently bonded together, and there is a –3 charge distributed over the entire ion. In a phosphate ion, the phosphorus atom is at the center with four oxygen atoms surrounding it, creating a tetrahedral shape. The charges in polyatomic ions like phosphate are not localized on a single atom but are spread over the entire ion, and these ions are formed through covalent bonds, not ionic bonds, between the phosphorus and oxygen atoms.
When calculating the charge of the phosphate ion, the valence electrons of phosphorus (which are 5) minus twice the number of oxygen atoms (4 in this case) give us the overall charge of the ion: 5 - (2 × 4) = –3. This polyatomic ion can be found in various compounds such as calcium phosphate, and Ca3(PO4)2, and is essential in biological systems and various chemical reactions.
What is the total number of valence electrons in a sulfide in th ground state?
which option is an example of physical properties?
A. toxicity
B. melting point
C. rusting ability
D. flammability
Chemistry : the atomic number of an element is 73. Is this paramagnetic or diamagnetic? :) ...?
Answer:
paramagnetic
Explanation:
Paramagnetic are those which has unpaired electrons and diamagnetic are those in which all electrons are paired.
Given the atomic number - 73
The electronic configuration is -
[tex]1s^22s^22p^63s^23p^63d^{10}4s^24p^64d^{10}5s^25p^64f^{14}5d^36s^2[/tex]
The electrons in 5d orbital = 3
These 3 will be unpaired as electrons are first singly filled.
Thus, the element is paramagnetic as the electrons are unpaired.
The periodic law states that the physical and chemical properties of elements are periodic functions of their?
elements are periodic functions of their atomic.
a. Masses b. numbers c. radii d. structures
Which reason best explains why metals are shiny? because their valence electrons reflect light/ because their valence electrons absorb light/ because their valence electrons oscillate between bands/ because their valence electrons move to higher energy levels
Answer: Option (c) is the correct answer.
Explanation:
It is known that metals have free electrons. These free electrons when come in contact with light, vibrate or oscillate at their respective position. As a result, the electrons gain small amount of energy and when this energy is released the surface of metal shines.
Thus, we can conclude that metals are shiny because their valence electrons oscillate between bands.
Which of the following characterizes the sodium-potassium pump?
A) Sodium ions are pumped out of a cell against their gradient.
B) Potassium ions are pumped into a cell against their gradient.
C) The pump protein undergoes a conformational change.
D) Only A and B are correct.
E) A, B, and C are all correct.
Which diatomic molecule is formed when the two atoms share six electrons
The diatomic molecule that is formed when two atoms share six electrons is N2.
The atomic number of nitrogen is 7 and its electronic configuration is 2,5. This implies that, nitrogen has 5 electrons in its outermost shell. To attain the octet structure, it needs 3 electrons more. To form a diatomic molecule, two nitrogen atoms come together and each donate three electrons, which are equally shared between the two, thus, each ends up having 8 electrons in its outermost shell.
In the compound H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming ____. (1 point)
cations
ionic bonds
nonpolar molecules
polar bonds