Science U1T: Substances & Mixtures

What is an example of the chemical reaction?

• Melting ice

• Evaporating water

• Burning bread

What is an example of a phase change?

• Burning a marshmallow

• Boiling water on the stove

• Combining two substances and a chemical reaction occurs

What is an example of a chemical reaction?

• Evaporating tea

• Mixing lemonade

• Burning a cake

What is an example of a phase change?

• Boiling coffee

• Burning a pancake

• The combination of two substances whose atoms rearrange

A chemical reaction occurs when substances interact and their atoms _______________?

• Despair

• Change size

• Creating new atoms

• Rearrange

What is always true of when a substance undergoes a phase change?

• A new substance with new properties will form

• The substance becomes a liquid as it heats up

• The melting point of the substance changes

• The substance is made up of the same type of molecules

What is the ONLY way to know if a chemical reaction occurred?

• You see the evidences (bubbles, light given off, heat given off, color change, smell is released)

• You test the properties to make sure that they are different

• You test to see if the space between and movement of the atoms/molecules changes

What changes during a phase change?

• Atoms rearrange

• The space and movement of atoms/molecules

• New substance is created