chapter 8

Question 1

particles can exist in the form of…?

Answer 1

atoms molecules and ions

Question 2

what is an atom

Answer 2

an atom is the basic unit of an element

Question 3

what is an atom made of

Answer 3

electron neutron proton

Question 4

what are electron neutron proton classified under

Answer 4

subatomic particles

Question 5

relative mass of electron proton neutron

Answer 5

1/1840, 1 , 1

Question 6

relative charge of electron proton neutron

Answer 6

-1, 0, +1

Question 7

explain why an atom is electrically neutral

Answer 7

it does not carry an overall charge beacuse the number of electron adn protons are the same hence the positive and negative charges are equal

Question 8

how to find proton number in an element

Answer 8

it is the atomic number (no. abv period table element)

Question 9

how to find electron in an element

Answer 9

same as proton

Question 10

how to find neutron in an element

Answer 10

mass number - atomic number (bigger-smaller) mass number is made out of proton and neutron

Question 11

define what a molecule is

Answer 11

2 or more atoms chemically combined tgth

Question 12

what is a molecule of an element

Answer 12

consists 2 or more of one singular type of atom

Question 13

what is molecule of a compound

Answer 13

consists of 2 or more diff types of atom

Question 14

what is symbol for oxygen

Answer 14

O

Question 15

what is chemical formulae for oxygen

Answer 15

O2

Question 16

with o2 u can tell that…

Answer 16

there are two atoms in oxygen

Question 17

in H2O u can tell that

Answer 17

there are two hydrogen atoms and one singular oxygen atom

Question 18

composition of air

Answer 18

(O2) oxygen is a molecule of element
(CO2) carbon dioxide is a molecule of compound
(N2) nitrogen is molecule of element
(H2O)water vapour is molecule of compound
(He)helium is an atom

Question 19

whats an ION

Answer 19

if a atom loses electrons, it is positively charged
if an atom gains electrons, it is negatively charged

Question 20

both atom and molecules are …. type of partical

Answer 20

neutrally charged