Reaction A has a high activation energy, whereas reacton B has a low activation energy. Which of the statements about reaction A and reaction B are true? Reaction B is likely to occur at a faster rate than reaction A. Reaction A is more likely to occur at all than reaction B. Reaction B is more likely to occur at all than reaction A. Reaction A is likely to occur at a faster rate than reaction B.

Answers

Answer 1

Answer:

The statement about reaction A and reaction B are true is: A. Reaction B is likely to occur at a faster rate than reaction A.

An activation energy can be defined as the minimum quantity of energy that must be provided for reacting chemical elements, so as to undergo a chemical reaction. Thus, the activation energy of a chemical reaction must first of all be reached by its combining chemical elements (reactants) before it can start or begin.

As a general rule, the lower the activation energy of a chemical reaction, the faster is the rate of a chemical reaction and vice-versa. This ultimately implies that, the activation energy of a chemical reaction should be lowered, in order for it to occur fast (quickly) enough over a short period of time.

In conclusion, reaction B is likely to occur at a faster rate than reaction A because of its low activation energy.

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You are given mixture made of 290 grams of water and 14.2 grams of salt. Determine the % by mass of salt in the salt solution.

Answers

Answer:

Solution is 4.67% by mass of salt

Explanation:

% by mass is the concentration that defines the mass of solute in 100g of solution.

In this case we have to find out the mass of solution with the data given:

Mass of solution = Mass of solute + Mass of solvent

Solute: Salt → 14.2 g

Solvent: Water → 290 g

Solution's mass = 14.2 g + 290g = 304.2 g

% by mass = (mass of solute / mass of solution) . 100

(14.2 g / 304.2g) . 100 = 4.67 %

6. A sample of nitrogen gas weighs 130 g. Write the chemical formula for nitrogen gas. Howmany molecules of elemental nitrogen is this? How many atoms of nitrogen are in this sample?

Answers

Chemical formula for nitrogen gas is N₂.

To find the number of molecules in the given sample, we have to convert the mass of the sample to moles by using the molecular mass of elemental nitrogen (N₂).

$130gN_2\cdot(1molN_2)/(28gN_2)=4.64molN_2$

Now, we have to use Avogadro's number (6.022x10^23) that indicates the number of molecules in one mole of substance:

$4.64molN_2\cdot(6.022*10^(23)molecules)/(1molN_2)=2.79*10^(24)molecules$

It means that there are 2.79x10^24 molecules of elemental nitrogen.

To find the number of atoms we just have to multiply the number of molecules by 2, which is the number of atoms of nitrogen per molecule of elemental nitrogen:

$2.79*10^(24)molecules\cdot(2atoms)/(1molecule)=5.59*10^(24)atoms$

There are 5.59x10^24 atoms of nitrogen in the sample.

Which is not a product of the fractional distillation of petroleum?A) Gasoline
B) Jet Fuel
C) steel

Answers

Answer:
Option-C, STEEL is not a product of the fractional distillation of petroleum.

Explanation:
Petroleum is the mixture of Hydrocarbons *carbon and hydrogen containing compounds) present beneath the Earth's surface. Petroleum is formed from the remains of animals and plants beneath earth's surface in an anaerobic conditions.
Petroleum contains from small hydrocarbons (gases) to medium (liquids) and long chain hydrocarbons (Solids). These hydrocarbons are separated from each other by Fractional Distillation method (separation due to difference in boiling points)
Gasoline is a derivative of one of the fraction of petroleum used in internal combustion engines.
Jet Fuel is also derived from Kerosene and Naphtha fractions of petroleum.
While, Steel is inorganic Alloy (mixture of metals) composed of mainly Iron, Carbon and other elements.

Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g) Which of the following actions would not change the measured cell potential? Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s) Sn2+ (aq) + H2 (g) Which of the following actions would not change the measured cell potential? addition of more tin metal to the anode compartment increasing the pressure of hydrogen gas in the cathode compartment lowering the pH in the cathode compartment increasing the tin (II) ion concentration in the anode compartment Any of the above will change the measured cell potential. Request Answer

Answers

Answer:

The only thing that will not affect the potential is the adition of solid Sn.

Explanation:

The potencial of a cell is linked to the concentration of the substances involved in the reactions by the equation of Nernst. So a change of one of them would change the cell potential.

$E=E^(\circ)-(R*T)/(n*F)*ln(Keq)$

The Keq for this reaction is:

$K_(eq)=([Sn^(2+)]*[H_2])/([H^+])$

Sn is not included because it's in solid state.

As can be seen, changing the concentrations of H2 (increasing the pressure), H+ (lowering the pH) or Sn2+ will affect the potential.

The only thing that will not affect it is the adition of solid Sn.

Based on the equilibrium constant equation, addition of Sn will not affect cell potential.

What is cell potential?

Cell potential refers to the potential difference that exists between two points in an electrochemical cell.

The Nerst equation shows the relationship between the cell potential and the concentration of the substances involved in the reactions.

$E=E^(\circ)-(R*T)/(n*F)*ln(Keq)E=E ∘ − n∗FR∗T ∗ln(Keq)$

Any change of one values results in a change in the cell potential.

The equilibrium constant for this reaction is given as follows:

$K_(eq)=([Sn^(2+)]*[H_2])/([H^+])$

Based on equilibrium constant equation, changing the amount of Sn will not affect cell potential since it is not included in the equilibrium constant equation.

Therefore, addition of Sn will not affect cell potential.

Learn more about cell potential at: brainly.com/question/19036092

Explain the arrangement of the first 20 elements in the periodic table. Please help! Will give brainliest!

Answers

There are various kind of elements that are present in periodic table. Elements that are metals are kept on left side of periodic table and elements which are non metals are kept on right side of periodic table.

What is periodic table?

Periodic table is a table in which we find elements with properties like metals, non metals and metalloids element arranges in increasing atomic number.

The first 20 elements of periodic table are Hydrogen, Helium, Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen, Fluorine, Neon, Sodium, Magnesium, Aluminum, Silicon, Phosphorus, Sulfur, Chlorine, Argon, Potassium and Calcium. Out of these Lithium, Beryllium, Sodium, Magnesium. Potassium and Calcium are metals so they are kept on the left side of the periodic table while others are non metals so they are kept on right side of periodic table.

Learn more about periodic table, here:

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Elements are arranged from left to right and top to bottom in order of increasing atomic number.

What is the solubility of substance?

Answers

Explanation:

Solubility is a chemical property referring to the ability for a given substance, the solute, to dissolve in a solvent. It is measured in terms of the maximum amount of solute dissolved in a solvent at equilibrium. The resulting solution is called a saturated solution.

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