chap2, form 4

Question 1

definition of matter

Answer 1

Something that has mass or occupies space

Question 2

matter is divided into 2. name it

Answer 2

elements and compounds

Question 3

definition of isotope

Answer 3

Atoms of the same element with different no of neutrons and same no of protons

Question 4

what are the 3 subatomic particles

Answer 4

proton, neutron, electron

Question 5

charge, relative mass of proton

Answer 5

+1, 1

Question 6

charge, relative mass of electron

Answer 6

-1, 1/1840

Question 7

charge, relative mass of neutron

Answer 7

neutral, 1

Question 8

acronym of chemists who found structure of atom

Answer 8

JJENJ

Question 9

John dalton found

Answer 9

atom

Question 10

J.J Thomson found

Answer 10

electron and proton

Question 11

Ernest rutherford found

Answer 11

nucleus, and that electrons orbit around it

Question 12

Neils bohr found

Answer 12

shell

Question 13

James Chadwick found

Answer 13

neutron

Question 14

Why does the temperature remain constant at melting/boiling/freezing point?

Answer 14

Heat energy absorbed/released is used to break forces of attraction / pull them closer

Question 15

as heat energy ___, kinetic energy ___

Answer 15

increases, increases

Question 16

formula to find RAM of isotopes

Answer 16

[%]isotope x mass + [%]isotope x mass over 100

Question 17

use of cobalt-60

clue: medical

Answer 17

radiotherapy, cancer

Question 18

use of iodine-131

clue: medical

Answer 18

treat thyroid disorders

Question 19

use of phosphorus-32

clue: agriculture

Answer 19

plant metabolism

Question 20

use of uranium-235

Answer 20

generate electricity

Question 21

use of carbon-14

Answer 21

carbon dating

Question 22

use of lead-210

Answer 22

determine age of rock, earth

Question 23

use of hydrogen-3

Answer 23

treat sewage and liquid waste

Question 24

use of sodium-24

Answer 24

detect leakage in underground pipes

Question 25

electronic structure of atom has these 2 features

Answer 25

label nucleus with atom | electron arrangement

Question 26

atomic structure of atom has this feature

Answer 26

in nucleus, write number of proton and neutron

Question 27

limit for 3rd shell of electrons

Answer 27

18

Question 28

Why is a water bath used?

Answer 28

To ensure even heating of substance.

Question 29

Why is naphthalene not heated directly using Bunsen Burner?

Answer 29

To avoid direct heating which can produce poisonous and flammable vapour gas

Question 30

Why is naphthalene stirred continuously, and boiling tube cooled inside a conical flask?

Answer 30

To ensure that an even cooling process is carried out