Chemical Reactions

A chunk of limestone, which is calcium carbonate, reacts with acid at a certain rate. If the limestone were crushed, the rate of the reaction between the acid and limestone would

• decrease

• remain the same

• increase

• not enough information

In terms of energy, the general chemical equation AB + CD + Energy -> AD + CB represents what type of reaction

• exothermic

• endothermic

• formed

• hypnotic

During a chemical reaction, energy is released when chemical bonds are

• intertwined

• formed

• broken

• dancing

What reactant is ALWAYS found in a combustion reaction

• water

• carbon dioxide

• calcium

• oxygen

In a decomposition reaction, there is/are how many reactant (s) and two products

• one

• two

• several

• no

The molar mass of oxygen is

• 12.1 g/mol

• 8 g/mol

• 16.00 g/mol

• 24 g/mol

What is the whole number written in front of the formula for a reactant or product in order to help balance a chemical equation

• coefficient

• subscript

• suspect

• mass

The statement that in chemical reactions, the total mass of the reactants equals the total mass of the products is the law of conservation of

• energy

• oxygen

• endothemic

• matter

Which of the following is a way to speed up the reaction of Alka-seltzer in water? (choose all that apply)

• putting ice cubes in the water to cool the water down

• stirring the tablet in water

• crushing the tablet before putting it in water

Catalysts/Enzymes speed up the rate of chemical reactions by

• increasing the surface area of the reactants

• lowering the energy required to break the reactant's bonds

• increasing the concentration of the reactants

• causing the reactants to move faster