A change that begins and ends with the same type of matter
100
What is a chemical change?
A change that produces new matter with different properties from the original matter
100
What is an atom?
The smallest division of matter
100
What are the three states of matter?
Solid, liquid and gas
200
Is gas matter?
Yes
200
What are three indicators that a chemical change has occurred?
change in color, odor, presence of light, heat and/or gas
200
What are three indicators that a physical change has occurred?
change in size, shape, position, state
200
What two particles are found in the nucleus?
a) protons and electrons
b) neutrons and electrons
c) protons and neutrons
d) electrons only
c) protons and neutrons
200
What makes matter change from solid, to liquid to gas?
Heat energy
300
Describe how the atoms in a solid are arranged
Very close together
300
Are chemical changes reversible? (Yes or no)
Chemical changes are not reversible
300
Are physical changes reversible? (Yes or no)
Yes
300
Are electrons positively or negatively charged?
negatively
300
What do you call the process that changes an ice cube into liquid water?
Melting
400
Describe how the atoms in a gas are arranged
Very far apart
400
Is the mixing of water and sugar a physical or a chemical change?
physical change. You can reverse the process.
400
Is a rusted penny an example of a physical or a chemical change?
Chemical change. There is a change in color.
400
An atom has the same amount of protons and electrons. True or False
True
400
What do you call the process that changes water vapor into liquid water?
Condensation
500
Give an example of one solid, one liquid and one gas
solid: table, rock, pen etc.
liquid: water, juice, milk etc.
gas: air, oxygen, helium etc.
500
Cutting up a cake into six pieces is an example of a physical or a chemical change?
physical change.
500
If you bite an apple and then leave it on the table for 20 minutes, the apple will start turning dark. This is called oxidation. Is the oxidation of an apple an example of a physical or a chemical change?
Chemical change. There was a change in color.
500
An ion is an atom that has the same number of protons and electrons. True or false.
False. Ions are atoms that have a different number of protons and electrons.
500
Rain an example of:
a) melting
b) condensation
c) freezing
d) evaporation