Reviewing Chemical Reactions

Front

What is a chemical reaction?

Back

A process where substances (reactants) undergo a transformation to form new substances (products) with different properties.

Front

What happens to atoms during a chemical reaction?

Back

Atoms are rearranged to form new substances; they are neither created nor destroyed.

Front

What is the law of conservation of mass?

Back

In a closed system, the total mass of reactants equals the total mass of products; mass is conserved.

Front

What are some indicators of a chemical reaction?

Back

Change in color, formation of a gas, temperature change, and formation of a precipitate.

Front

What is thermal energy?

Back

The energy that comes from the temperature of matter; it is the total kinetic energy of particles in a substance.

Front

How can you measure the effectiveness of a hand warmer?

Back

By measuring the temperature change before and after activation, and during use.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings, resulting in a decrease in temperature.

Front

What is an exothermic reaction?

Back

A reaction that releases heat to its surroundings, resulting in an increase in temperature.

Front

What is a reactant?

Back

A substance that undergoes a chemical change in a reaction.

Front

What is a product?

Back

A substance that is formed as a result of a chemical reaction.