Chemical Equations and Reactions Review

A product is:

• material acted upon

• material made in the reaction

• starting material

• process of reacting

Which of the following is not a word equation?

• flour + water + yeast → bread

• sodium + water → sodium hydroxide + hydrogen

• drive down highway → don't get lost

• silver nitrate + sodium chloride → silver chloride + sodium nitrate

The proper form for a chemical equation is:

• reactants → products

• reactants produce products

• products → reactants

• products are formed from reactants

The symbol Δ in a chemical equation means:

• change in volume

• change in rate

• material is heated

• material is cooled

When a chemical symbol is written above the yield arrow in a chemical equation, that means:

• the chemical is one of the reactants

• the chemical is a catalyst in the reaction

• the chemical is a product

• the chemical is added after the reaction starts

Which of the following is used to describe the physical state of a reactant or product?

• w

• p

• l

• r

In a chemical formula, the subscript stands for the number of:

• atoms of an element in the compound

• molecules in the reaction

• products that will be formed

• reactants needed for the reaction to proceed

Balancing equations relies on the law of:

• conservation of energy

• conservation of momentum

• conservation of mass

• conservation of heat

Only one of the following techniques is used in balancing chemical equations:

• change subscripts

• change coefficients

• add extra materials

• only balance key reactants

Atoms cannot be created or destroyed.

• True

• False