Chemical Equations

Question 1

Sodium Bromide

Answer 1

NaBr

Question 2

Methane+Oxygen->

Answer 2

Carbon Dioxide+Water

Question 3

Charge of atoms in Group 1

Answer 3

+Charge

Question 4

Charge of atoms in Group 2

Answer 4

2+Charge

Question 5

Charge of atoms in Group 3

Answer 5

3+Charge

Question 6

Charge of atoms in Group 5

Answer 6

3-Charge

Question 7

Charge of atoms in Group 6

Answer 7

2-Charge

Question 8

Charge of atoms in Group 7

Answer 8

-Charge

Question 9

Aliminium Chloride

Answer 9

AlCl3

Question 10

Calcium Sulfide

Answer 10

CaS

Question 11

Name 5 Covalent Compounds

Answer 11

CO2, SO2, S03, NH3, PCl3

Question 12

Are the properties of a compound the same as the elements that make it up?

Answer 12

No

Question 13

Producing an element from a compound involves….

Answer 13

Chemical Change

Question 14

How do you calculate the relative mass of compounds?

Answer 14

work out how many atoms of each element there are in the chemical formula. add together the Afor all the atoms of each element present.

Question 15

How do you calculate the percentage by mass of an element in a compound?

Answer 15

To calculate the mass percent of an element in a compound, we divide the mass of the element in 1 part of the compound by the compound’s total mass and multiply the result by 100.

Question 16

Molecule

Answer 16

A group of atoms held together by covalent bonds

Question 17

7 Covalent Compounds

Answer 17

CO, CO2, SO2, SO3, PCl3, PCl5, NH3