terms

Question 1

chemical formula

Answer 1

a combination of chemical numbers and substances that are used to represent a substance

Question 2

compounds

Answer 2

made of more then 1 atom. H20, C02, etc.

Question 3

elements

Answer 3

hydrogen, oxygen, carbon, sodium, chloride, etc.

Question 4

2H2 + 1O2 = 2H2O

Answer 4

two hydrogen molecules + one oxygen molecule = two water molecules

Question 5

We can make or break compounds by __________

Answer 5

chemical reactions

Question 6

C9H2O8 =

Answer 6

9 carbon dioxide, 2 hydrogen, 4 oxygen

Question 7

atomic mass

Answer 7

protons + nuetrons

Question 8

CO2 = ?

Answer 8

one carbon and two oxygen

Question 9

chemical bond

Answer 9

holds 2 atoms together

Question 10

chemical equations

Answer 10

easy way to show chemical reactions

Question 11

atomic number

Answer 11

number of protons

Question 12

hydrogen and oxygen are mostly found in

Answer 12

gas

Question 13

an element

Answer 13

one kind of atom

Question 14

electrons

Answer 14

a subatomic particle with a negative charge. electrons carry electricity in solids, among other things. they are found in a cloud circling the nucleus

Question 15

proton

Answer 15

a subatomic particle with a positive charge. protons and neutrons are heavier then electrons. they are found in the nucleus at the center of the atom.

Question 16

neutron

Answer 16

a subatomic particle with a neutral charge. they are found in the nucleus. it helps keep the nucleus together.

Question 17

electron cloud

Answer 17

a bunch of electrons circling an atom’s nucleus.

Question 18

nucleus

Answer 18

the center of the atom, contains protons and neutrons