P45-54 Flashcards
1
Q
International System of Units (SI)
A
The system of units (SI) used by scientists to measure the properties of matter
2
Q
mass
A
A measure of how much matter is in an object
3
Q
density
A
The ratio of the mass of a substance to its volume
4
Q
physical change
A
A change in a substance that does not change its identity
5
Q
Chemical change
A
A change in which one or more substances combine or break apart to form new substances
6
Q
law of conservation of mass
A
The principle that the total amount of matter is neither created nor destroyed during any chemical or physical change
7
Q
endothermic change
A
A change in which energy is taken in
8
Q
energy
A
The ability to do work or cause change
9
Q
exothermic change
A
A change in which energy is given off
