chemistry unit 1

Question 1

what is the process called when solid turns liquid

Answer 1

melting

Question 2

what is the process called when liquid turns gas

Answer 2

evaporation

Question 3

what is the process called when solid turns gas

Answer 3

sublimation

Question 4

what is the process called when gas turns liquid

Answer 4

condensation

Question 5

what is the process called when liquid turns solid

Answer 5

freezing

Question 6

matter definition

Answer 6

substances made out of atoms

Question 7

element definition & example

Answer 7

only 1 type of atom
H / O

Question 8

compound definition & example

Answer 8

2 or more different elements chemically bonded ( hard to separate )
H2 / O2

Question 9

isotopes definition

Answer 9

atoms that have the same number of protons but different number of neutrons

Question 10

isotopes RMM formula

Answer 10

(abundance (%) x atomic mass ) + (abundance (%) x atomic mass ) / 100

Question 11

proton charge

Answer 11

+

Question 12

neutron charge

Answer 12

no charge

Question 13

electron charge

Answer 13

-

Question 14

what does nucleus contain

Answer 14

proton neutron

Question 15

proton number in neutral element = ?

Answer 15

electron number

Question 16

total proton number = ?

Answer 16

mass number

Question 17

atomic number in neutral element = ?

Answer 17

proton number or electron number

Question 18

mass number = ?

Answer 18

proton number + neutron number

Question 19

isotope = ?

Answer 19

neutron number changes but others don’t change in an atom

Question 20

Mr formula

Answer 20

mass = moles x Mr

Question 21

chromatography Rf formula

Answer 21

distance from the baseline to the spot / distance from the baseline to the solvent

Question 22

volume of gas formula

Answer 22

moles x molar volume