States of Matter
What is an example of solids in real life?
Rock, table, metal
What is an atom?
Particles so tiny that is invisible to the naked eye, uncuttable
What does it mean to go through a physical change?
No new substances are made. It can go back to its original form.
What does it mean to go through a chemical change?
New substances are made. It can't go back to its original form.
What is a characteristic of a gas?
It fills up the space.
What are the three parts of an atom?
Neutrons, protons, and electrons.
What is another term for physical changes?
Reversible change.
What is another term for chemical changes?
Irreversible change.
When you change liquids to gas, what is it called?
Evaporation
What charge does the neuron have?
None, neutral.
True or false: Baking bread is a physical change.
False
True or false: Baking bread is a chemical change.
True
When you change liquids to solids, what is it called?
Freezing
Why does the nucleus have a positive charge?
Because of protons.
Give an example of physical change other than water.
Chopping wood, cutting paper
Give an example of chemical change other than cooking or baking.
Fire burning, rusting metal
When you change solids to gases, what is it called?
Sublimation
What does an electron do?
It orbits around the nucleus.
Why is boiling water a physical change?
Because the water that you boil can evaporate into gas and that gas can cool down back into liquid, going back to its original form.
Why is digesting food in your stomach a chemical change?
Because your stomach acid is breaking down the food you ate so your body can absorb it easily. You also cannot undigest food.