Chemistry

Question 1

what is covalent bonding

Answer 1

sharing of electrons (non-metals bonding with other non-metals)

Question 2

what is an element

Answer 2

pure substances made of only one type of atom.

Question 3

how to determine atomic mass

Answer 3

atomic number (z) + neutrons

Question 4

determine neutrons?

Answer 4

atomic mass (A) - atomic number (z)

Question 5

group names on periodic table

Answer 5

group 1 = alkali metals 
group 2 = alkali earth metals
between group 2&3 = transition metals
group 17 = halogens
group 18 = noble gases

Question 6

properties of metals

Answer 6

Conduct heat 
Conduct electricity
Malleable 
Ductile 
Most metals react with acid

Question 7

properties of non-metals

Answer 7

Do not conduct heat 
Do not conduct electricity
Dull
Brittle
Not ductile
Do not react with acid

Question 8

Polyatomic ions:

Answer 8

Ammonium ion: NH4+

Hydroxide: OH-
Nitrate: NO3-
Nitrite: NO2-

Sulphate: SO42-
Sulphite: SO32-
Carbonate: CO32-

Phosphate: PO43-

Question 9

Write chemical formulae for the following:

ammonium nitrate:

Answer 9

ammonium nitrate: NH4NO3

Question 10

chemical formulae for:

copper sulphate:

Answer 10

copper sulphate: CuS

Question 11

chemical formulae for:

ammonium oxide:

Answer 11

ammonium oxide: (NH4)2O

Question 12

chemical formulae for:

magnesium hydroxide:

Answer 12

magnesium hydroxide: Mg(OH)2

Question 13

chemical formulae for:

potassium hydroxide:

Answer 13

potassium hydroxide: KOH

Question 14

chemical formulae for:

lithium carbonate:

Answer 14

lithium carbonate: LiCO3

Question 15

chemical formulae for:

sodium phosphate:

Answer 15

sodium phosphate: NaPO4

Question 16

chemical formulae for:

aluminium sulphite:

Answer 16

aluminium sulphite: Al(SO3)3

Question 17

chemical formulae for:

Nickel(III) nitrite:

Answer 17

Nickel(III) nitrite: Ni(NO2)3

Question 18

chemical equation ?

(a) Fe+ Cl2 −−→ FeCl3

Answer 18

(a) 2 Fe+3 Cl2 −−→ 2 FeCl3

Question 19

chemical equation?

(d) C4H6O3 + H2O −−→ C2H4O2

Answer 19

(d) 1 C4H6O3 +1 H2O −−→ 2 C2H4O2

Question 20

Polyatomic ions:

Answer 20

Ammonium ion: NH4+

Hydroxide: OH-
Nitrate: NO3-
Nitrite: NO2-

Sulphate: SO42-
Sulphite: SO32-
Carbonate: CO32-

Phosphate: PO43-

Question 21

Write chemical formulae for ammonium nitrate:

Answer 21

(NH4) + (NO3) = (NH4) (NO3)

Question 22

examples of diatomic molecules

hint, “Have No Fear Of Ice Cold Beer”

Answer 22

Hydrogen, Nitrogen, Flourine, Oxygen, Iodine, Chlorine, and Bromine.

Question 23

what is Ionic bonding

Answer 23

the transfer of electrons occuring (metal bonds with a non-metal)

Question 24

examples of ionic bonding

Answer 24

NaCl - Sodium Chloride
KF - Potassium Fluoride
MgO - Magnesium Oxide

Question 25

what is a compound?

Answer 25

two or more elements that have chemically bonded