Reactions in the Kitchen
This happens when a liquid turns into a solid in very cold temperatures.
Freezing
Name the three main states of matter.
solid, liquid, gas
Is cutting fruit a chemical or physical change?
Physical
Name one example of a natural polymer.
DNA
Rubber
Protein
This happened to the chocolate chips when heated in the oven.
Melting
What happens to a solid when you heat it?
It melts into a liquid.
Is baking a cake a chemical or physical change?
Chemical
What is a polymer?
A long chain of repeating parts called monomers
What do you get when you mix baking soda and vinegar?
bubbles from carbon dioxide gas
What state of matter is steam?
Gas
What clues tell you a chemical change has happened?
New smell, bubbles, color change, can’t go back.
What do we call the small parts that make up a polymer?
Mononmers
What happens when you add lemon juice to milk?
Curdles – a chemical change
What process turns liquid into gas?
Evaporation or boiling
Is melting chocolate a chemical or physical change?
Physical
What ingredient makes slime stretchy?
Glue—it contains polymers
This happens when a solid is placed in a very warm environment.
Melting
How do particles act in a solid?
Particles barely move because they are tightly packed together.
When vinegar and baking soda mix, is that a chemical or physical change?
Chemical—gas is formed
Is slime a chemical or physical change?
Chemical—it forms a new substance