Unit 3 Lesson 1

What happened when the steel wool was burned?

• Its mass decreased because metal melted off.

• Its mass increased because it reacted with air to form a new metal

• It did not burn because metal does not burn

A chemical reaction occurs. Which statement is true of the reactants and products in the reaction?

• The atoms in the products were regrouped into different molecules to form reactants.

• The atoms in the reactants were regrouped to form the products.

• The atoms in the products were destroyed and new molecules appeared to form reactants.

• The atoms in the reactants were destroyed and new molecules appeared to form the products.

Which process is an example of a chemical reaction occuring?

• Cooking a steak

• Chopping a tree

• Heating a cup of tea

• Drying clothes in the dryer

Describe how matter and energy are transformed when a log is burned. Are matter and energy created or destroyed?

When a log is burned...