Chemical Reactions

Front

In a chemical reaction, no new atoms are created, and no atoms are destroyed.

Back

True

Front

Why is a chemical change different from a physical change?

Back

A new substance is formed and in a physical change no new substance is formed.

Front

The left side of the equation below is called

Back

Reactants

Front

The right side of the equation is called the

Back

products

Front

Which statement is not a description of a chemical reaction? Options: A solid is dropped into a beaker of liquid and a gas is released., Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker., A solid is dropped into a beaker of liquid and an explosion occurs., A liquid is heated in the sun and half of it evaporates.

Back

A liquid is heated in the sun and half of it evaporates.

Front

A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.

Back

Coefficient

Front

A chemical reaction that absorbs heat

Back

Endothermic

Front

In a chemical reaction, what happens to the atoms of the reactants?

Back

The atoms of the reactants unbond, rearrange, and then rebond to form the products.

Front

Balance the equation: __K + __Br₂ --> __KBr

Back

2, 1, 2

Front

If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be: 4CO₂ + 3H₂O, 3CO₂ + 4H₂O, 2CO₂ + 3H₂O, 3CO + 4H₂O

Back

3CO₂ + 4H₂O