Physical and Chemical Reactions

Physical and Chemical Reactions

Key 8 Slideshow

Multiple Choice

The law of conservation of mass states

• matter can not be created or destroyed

• matter can be created and destroyed

• matter can be changed and created

• matter can be rearranged and destroyed

Multiple Choice

What is a sign of a physical change?

• odor produced

• change in state of matter

• light

• temperature change

Multiple Select

Which of these are consider physical changes (multiple answers):

• Crushing a can

• chopping wood

• mixing sugar into water

• shredding paper

Multiple Choice

Using the image above determine if a physical or chemical change has occurred in Model B.

• A chemical change has occurred in model B. In the second cup you can see that the molecules have just rearranged.

• A chemical change has occurred in model B. In the second cup you can see a bond (black line) has formed between the green and blue molecule and new light pink/light blue molecules have also formed.

• A physical change has occurred in model B. In the second cup you can see that the molecules have just rearranged.

• A physical change has occurred in model B. In the second cup you can see a bond (black line) has formed between the green and blue molecule and new light pink/light blue molecules have also formed.

Multiple Select

Which of these is a chemical change?

• Digesting food

• cooking an egg

• Rotting Banana

• Cutting an orange

Multiple Choice

What is a sign of a chemical change?

• change in state of matter

• change in size

• change in shape

• temperature change

Multiple Choice

In a chemical reaction, mass is conserved. This means that

• The mass of the products stays the same during a chemical reaction

• The mass of the products is always twice the mass of the reactants

• The mass of the reactants stays the same during a chemical reaction

• The type and number of atoms in the reactants equals the type and number of atoms in the products

Multiple Choice

In a chemical reaction, mass is conserved. This means that

• The mass of the products stays the same during a chemical reaction

• The mass of the products is always twice the mass of the reactants

• The mass of the reactants stays the same during a chemical reaction

• The type and number of atoms in the reactants equals the type and number of atoms in the products

Multiple Choice

In a chemical reaction, mass is conserved. This means that

• The mass of the products stays the same during a chemical reaction

• The mass of the products is always twice the mass of the reactants

• The mass of the reactants stays the same during a chemical reaction

• The type and number of atoms in the reactants equals the type and number of atoms in the products

Multiple Choice

In a chemical reaction...

• The atoms of the reactants always stay together to form the products

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

• New atoms are formed which combine to make the products

• Some atoms disappear while others multiply to form the products

Multiple Choice

A chemical change is different than a physical change because in a chemical change...

• Chemicals are used

• Molecules do not physically touch

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

• The change can be seen but in a physical change it cannot