Chemical Equations and Reactants Quiz

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Questions and Answers

If you react 4 units of A with 10 units of B in the given chemical equation, what is the relationship between the amounts of A and B?

The amounts of A and B are equivalent. (correct)
The amount of A is greater than the amount of B.
The amount of B is greater than the amount of A.
The amounts of A and B are not equivalent.

What is the primary function of a catalyst in a chemical reaction?

A catalyst has no effect on the rate of the chemical reaction.
A catalyst increases the amount of product formed in the reaction.
A catalyst increases the rate of reaction by increasing the activation energy.
A catalyst increases the rate of reaction by decreasing the activation energy. (correct)

Which of the following best describes a limiting reactant?

A limiting reactant is the reactant that determines how much product can be made. (correct)
A limiting reactant is the reactant that has the highest concentration.
A limiting reactant is the reactant that is added in the largest quantity.
A limiting reactant is the reactant that has the lowest concentration.

What is the result of adding neutrons to an atom's nucleus?

The atomic weight of the element is changed. (A) Signup and view all the answers

Which of the following statements about the relationship between an element's atomic number and atomic weight is correct?

An element's atomic number determines the number of protons. (B) Signup and view all the answers

In the chemical equation 2A + 5B → C + 3D, what is the largest amount of C that can be produced from 4 units of A and 10 units of B?

4 units (B) Signup and view all the answers

Which of the following statements about catalysts is true?

A catalyst increases the rate of a reaction by providing an alternative pathway with lower activation energy. (A) Signup and view all the answers

What is the purpose of a bulking agent in a product?

To add volume to the product without altering its quality. (D) Signup and view all the answers

According to the collision theory, which of the following is a necessary condition for a chemical reaction to occur?

The reactants must collide with a minimum kinetic energy. (A) Signup and view all the answers

Which of the following statements about capillary action is correct?

Capillary action is the result of cohesive forces between molecules of the same substance. (C) Signup and view all the answers

Which of the following statements about ion-dipole interactions is correct?

Ion-dipole interactions occur between an ion and a polar molecule. (A) Signup and view all the answers

Which of the following statements about the Big Bang Theory is correct?

The Big Bang Theory suggests that the universe began from a singularity and is expanding. (B) Signup and view all the answers

Which of the following statements about carbon disulfide (CS2) is correct?

CS2 is an example of a non-polar covalent bond. (B) Signup and view all the answers

If a detergent has a pH of 4.5, what can be said about its acidity?

The detergent is acidic. (C) Signup and view all the answers

Which of the following statements about crushing a solid into a powder is correct?

Crushing a solid into a powder increases the reaction rate due to increased surface area. (C) Signup and view all the answers

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Study Notes

Chemical Reactions

A catalyst increases the rate of a reaction by lowering the activation energy.
A limiting reactant determines how much product can be made.
In the equation 2A + 5B → C + 3D, if 4 units of A react with 10 units of B, there are equivalent amounts of A and B.

Atomic Structure

An element's atomic number determines the number of protons.
An element's atomic weight determines the number of protons and neutrons.

Molecular Interactions

Attraction between an ion and a polar molecule is the result of ion-dipole interaction.
Cohesive forces bring about capillary action and are attractions among different molecules.

Chemical Bonding

CS2 is not an example of a polar covalent bond.

Products and Manufacturing

An active ingredient provides the desired and specified effect of a product.
A bulking agent adds volume to a product without altering its quality.
In a tricycle factory, if 270 tires, 90 frames, and 170 pedals are available, tires would limit the number of complete tricycles that can be assembled.