chapter 2 and 3

Question 1

is all made up of elements

Answer 1

Matter

Question 2

substances that cannot be broken down into simpler substances by ordinary chemical means. There are 94 naturally occurring.

Answer 2

elements

Question 3

the building block of matter. Billions could fit on the head of a pin!

Answer 3

atoms

Question 4

Atoms of the same element can have a
a different number of neutrons.

Answer 4

isotopes

Question 5

when two or more of the same type
of atoms bond together

Answer 5

molecule

Question 6

a pure substance formed when
two or more different elements combine

Answer 6

compound

Question 7

The chemical bond that forms
when electrons are shared is
called

Answer 7

covalent bonds

Question 8

a substance that releases hydrogen
ions (H³) when dissolved in water

Answer 8

Acid

Question 9

substances that release hydroxide
ions (OH¯) when dissolved in water

Answer 9

Base

Question 10

the measurement of H³ in a solution.
7 is normal

Answer 10

pH

Question 11

mixtures that can react with acids or bases to keep the pH within a
particular range

Answer 11

Buffers