ATI TEAS: CHEMICAL REACTIONS

Which term best describes the substances that are present

before a chemical reaction occurs?

A) Catalysts

B) Products

C) Reactants

D) Results

In the chemical reaction: 2H2 + O2 → 2H2O, what are the

reactants?

A) H2 and H2O

B) O2 and H2O

C) H2 and O2

D) Only H2O

What do you call substances that are formed as a result of

a chemical reaction?

A) Reactants

B) Catalysts

C) Compounds

D) Products

Which type of reaction involves two reactants combining

to form one product?

A) Combination

B) Decomposition

C) Displacement

D) Double displacement

In the reaction: 2K + Cl2 → 2KCl, what type of reaction is

this?

A) Combination

B) Decomposition

C) Displacement

D) Combustion

Which type of reaction involves a single compound

breaking down into two or more simpler substances?

A) Decomposition

B) Displacement

C) Combination

D) Combustion

In a balanced chemical reaction, the number of atoms of

each element in the reactants is equal to the number of atoms of each

element in the ______.

A) Products

B) Catalysts

C) Mixtures

D) Solvents

When zinc reacts with hydrochloric acid, zinc chloride and

hydrogen gas are formed. Which type of reaction is this?

A) Decomposition

B) Combustion

C) Displacement

D) Combination

In the reaction: AgNO3 + NaCl → AgCl + NaNO3, which type of reaction is observed?

A) Combination

B) Decomposition

C) Displacement

D) Double displacement

In which type of reaction is oxygen combined with a

substance and energy is released as heat and light?

A) Combustion

B) Decomposition

C) Combination

D) Displacement

The number placed before the formula of a reactant or

product in a chemical equation is called a:

A) Coefficient

B) Subscript

C) Superscript

D) Exponent

In the reaction: CH4 + 2O2 → CO2 + 2H2O, how many moles of oxygen react with one mole of methane?

A) 1

B) 2

C) 3

D) 4

If 4 moles of hydrogen gas react with 2 moles of oxygen

gas to produce water, how many moles of water will be formed?

A) 1

B) 2

C) 3

D) 4

A substance that speeds up a chemical reaction without

getting consumed in the process is known as a:

A) Product

B) Catalyst

C) Reactant

D) Solvent

Which of the following best describes an endothermic

reaction?

A) A reaction that releases energy

B) A reaction that absorbs energy

C) A reaction where no energy change occurs

D) A reaction where energy remains constant

What do you call a small whole number that appears as a

factor in front of a formula in a chemical equation?

A) Coefficient

B) Subscript

C) Atomic number

D) Periodic number

Which type of chemical reaction is represented by the

equation: AB + CD → AD + CB?

A) Combination

B) Decomposition

C) Single displacement

D) Double displacement

Which of the following reactions represents a combustion

reaction?

A) N2 + 3H2 → 2NH3

B) 2H2O → 2H2 + O2

C) CH4 + 2O2 → CO2 + 2H2O

D) Na + Cl → NaCl

The total mass of reactants in a chemical reaction is

always equal to the total mass of the products. This statement is known as:

A) Law of conservation of energy

B) Law of conservation of momentum

C) Law of conservation of mass

D) Newton's third law of motion

Which type of reaction involves a single reactant breaking

down to form two or more products?

A) Combination

B) Decomposition

C) Displacement

D) Double displacement

What do you call the amount of substance that contains

as many entities as there are atoms in 12 g of carbon-12?

A) Gram

B) Mole

C) Atom

D) Molecule

Given the balanced chemical equation 2H2O2 -> 2H2O + O2, how many moles of hydrogen peroxide (H2O2) will be required to produce 4 moles of water (H2O)?

A) 1

B) 2

C) 4

D) 8

Which type of reaction is represented by the general

form: A + BC → B + AC?

A) Combination

B) Decomposition

C) Single displacement

D) Double displacement

In a chemical equation, if the number of atoms of an

element is not the same on both sides of the equation, the equation is:

A) Balanced

B) Unbalanced

C) Complete

D) Neutral

Which of the following is NOT a product of the

combustion of propane (C3H8)?

A) CO2

B) H2O

C) O2

D) Heat

If a chemical reaction can proceed in both forward and

reverse directions, it is called a:

A) Single reaction

B) Double reaction

C) Reversible reaction

D) Permanent reaction

What does the symbol "↑" typically indicate in a chemical

equation?

A) Precipitation

B) Gas evolution

C) Catalyst addition

D) Heat absorption

If you know the quantities of reactants used and the

quantities of products formed in a chemical reaction, you are dealing with:

A) Qualitative analysis

B) Stoichiometric calculations

C) Isotopic distribution

D) Atomic assessment

The coefficients in a balanced chemical equation

represent:

A) Atomic numbers

B) Molar ratios of reactants and products

C) Mass ratios of reactants only

D) Volume of reactants and products

When zinc metal is added to hydrochloric acid, the

resulting reaction is an example of which type of reaction?

A) Combination

B) Double displacement

C) Single displacement

D) Decomposition

When equal masses of reactants are mixed, the one which

gets completely consumed determines the:

A) Theoretical yield

B) Limiting reagent

C) Excess reagent

D) Actual yield

Which type of chemical reaction is represented by the

equation: A + B → AB?

A) Combination

B) Decomposition

C) Displacement

D) Double displacement

The smallest whole-number ratios in which different

types of atoms combine in a compound are represented by:

A) Atomic masses

B) Molar masses

C) Empirical formulas

D) Molecular formulas

What type of reaction involves the exchange of electrons

between two species?

A) Decomposition

B) Double displacement

C) Oxidation-reduction

D) Neutralization

In the balanced chemical equation N2+3H2→2NH3N2+3H2 →2NH3, the "3" in front of H2H2 is an example of a:

A) Subscript

B) Coefficient

C) Product

D) Reactant

If a chemical reaction absorbs heat from its

surroundings, it is termed as:

A) Exothermic

B) Endothermic

C) Catabolic

D) Anabolic

Which reaction showcases the breakdown of a compound

into simpler substances?

A) Combination

B) Double displacement

C) Decomposition

D) Single displacement

In a balanced equation, the number of each type of atom

on the reactant side is ___ to the number on the product side.

A) Greater than

B) Less than

C) Equal to

D) Unrelated

A chemical reaction that requires an input of energy to

proceed is said to be:

A) Exergonic

B) Endergonic

C) Exothermic

D) Catalytic

The type of chemical reaction where an acid and a base

combine to produce water and a salt is known as:

A) Oxidation

B) Reduction

C) Hydrolysis

D) Neutralization

In a combustion reaction, the reactants always include:

A) Water

B) Salt

C) Oxygen

D) Hydrogen

Which of the following is true about balanced chemical

reactions?

A) They violate the law of conservation of mass.

B) They only display the actual ratios in which reactants combine.

C) They ensure that the same amount of atoms are present on both sides.

D) They always involve the formation of a gas.

Which of the following describes the conversion of a

liquid to a gas?

A) Freezing

B) Melting

C) Vaporization

D) Sublimation

A process in which a solid directly changes to gas

without passing through a liquid phase is termed:

A) Vaporization

B) Condensation

C) Sublimation

D) Deposition

If a silver spoon tarnishes, the type of reaction occurring

is:

A) Neutralization

B) Reduction

C) Oxidation

D) Combustion

When hydrogen and oxygen combine to form water, this

type of reaction is:

A) Decomposition

B) Combustion

C) Displacement

D) Combination

Which among the following is NOT a sign of a chemical

reaction?

A) Formation of gas bubbles

B) Change in temperature

C) Precipitate formation

D) Boiling of liquid

A reaction in which a single compound splits into two or

more simpler substances is:

A) Double displacement

B) Decomposition

C) Single displacement

D) Combination

What type of reaction involves an element reacting with

a compound and displacing another element from it?

A) Single displacement

B) Double displacement

C) Combination

D) Decomposition

The small whole number that appears in front of a

formula in a balanced chemical equation represents:

A) Atomic number

B) Mole

C) Coefficient

D) Subscript

In a chemical reaction, the sum of the masses of the

reactants will always ___ the sum of the masses of the products.

A) Equal

B) Be less than

C) Exceed

D) Fluctuate with

A chemical reaction in which both oxidation and reduction

processes occur is termed:

A) Redox reaction

B) Combustion

C) Neutralization

D) Hydrolysis

Which of the following is an example of a combustion

reaction?

A) Mixing vinegar and baking soda

B) Burning a candle

C) Rusting of iron

D) Photosynthesis in plants

In a balanced chemical equation, if you change the

coefficient of a reactant or product, you must adjust:

A) The subscripts in the chemical formula

B) The charges on the ions

C) Other coefficients in the equation to maintain balance

D) The states of the reactants and products

Which among the following describes a process where a

solid turns into a liquid?

A) Deposition

B) Condensation

C) Freezing

D) Melting

In a combustion reaction involving hydrogen gas, which of

the following products is formed?

A) Carbon Dioxide (CO2)

B) Methane (CH4)

C) Hydrogen Peroxide (H2O2)

D) Water (H2O)