Mat & Chem Chg - Section 4

What is a chemical reaction?

When two or more substances combine to form new substances

What are reactants?

The materials at the start of a chemical reaction

What are products?

The new materials made after a chemical reaction

What is an exothermic reaction?

A chemical reaction that releases heat

What is an endothermic reaction?

A chemical reaction that absorbs heat

What is corrosion?

When iron reacts with oxygen to form rust

What is cellular respiration?

A reaction where food and oxygen produce water and carbon dioxide

What does the law of conservation of mass state?

Mass of reactants equals mass of products (in a closed system)

What is a catalyst?

A substance that speeds up a reaction without being used up

What are enzymes?

Catalysts that help break down food in the body

How does concentration affect a chemical reaction?

Higher concentration makes the reaction happen faster

How does temperature affect reaction rate?

Higher temperature increases reaction rate

How does surface area affect a reaction?

More surface area means faster reaction rate