topic one mid unit revision

Question 1

atom?

Answer 1

smallest piece of an element that can exist

Question 2

element?

Answer 2

contains only one type of atom

Question 3

compound?

Answer 3

two or more different elements chemically combined together

Question 4

mixture?

Answer 4

2 or more substances mixed but not chemically combined

Question 5

molecule?

Answer 5

2 atoms chemically joined

Question 6

example of an atom?

Answer 6

oxygen

Question 7

example of a compound?

Answer 7

carbon dioxide

Question 8

example of a mixture?

Answer 8

sand and salt

Question 9

filtration?

Answer 9

separation of insoluble solids from liquids

Question 10

distillation?

Answer 10

separating two liquids or a liquid from a soluble solid

Question 11

fractional distillation?

Answer 11

separating many liquids

Question 12

evaporation?

Answer 12

separating a soluble solid from a liquid

Question 13

chromotography?

Answer 13

separating solid substances

Question 14

atomic number = ??

Answer 14

atomic number = no of protons = no of electrons

Question 15

mass number = ??

Answer 15

no of protons + electrons

Question 16

neutrons = ??

Answer 16

neutrons = mass no - atomic no

Question 17

ions?

Answer 17

atoms that have lost or gained electrons

Question 18

what is an isotope?

Answer 18

isotopes are different atoms of the same element

Question 19

info about protons and electrons with isotopes?

Answer 19

isotopes have the SAME number of protons and electrons (atomic number) but with different number of neutrons (mass number)

Question 20

RAM relative atomic mass calculation?

Answer 20

(mass no of 1st isotope x abundance)
_______________________________________
100

Question 21

number of electrons in outer shell = ??

Answer 21

number of electrons in outer shell is equal to the group number (column number)

Question 22

no of shells is equal to ??

Answer 22

no of shells is equal to period (row) number