Properties of Substances

Properties of Substances

HW Unit 1.4chemical Economics-formula

1. The correct formula for copper (II) nitrate is

  1. CuNO3
  2. Cu(NO3)2
  3. Cu2NO3
  4. Cu2N3

2. The compound N2O4 is called

  1. Nitrogen monoxide
  2. Nitrogen dioxide
  3. Dinitrogen tetroxide
  4. Dinitrogen trioxide

3. The correct formula for lithium sulphide is

  1. LiS
  2. Li2S
  3. LiS2
  4. Li2S2

4. Z is a non-metal. It forms a compound with magnesium with the formula Mg3Z2. The non-metal Z must belong to group

  1. 4
  2. 5
  3. 6
  4. 7

5. The formula mass of the compound magnesium nitrate is

  1. 54.5
  2. 86.5
  3. 126.5
  4. 148.5

6. The mass of 5 moles of carbon is

  1. 12 g
  2. 36 g
  3. 60 g
  4. 84 g

7. The mass of 0.5 moles of water is

  1. 9 g
  2. 18 g
  3. 36 g
  4. 90 g

8. The number of moles of copper (II) nitrate contained in 18.75 g of copper (II) nitrate is

  1. 0.1
  2. 0.2
  3. 0.4
  4. 0.5

9. Calculate the number of moles of solute that need to be dissolved to make 200cm3 of a 0.5 moll-1magnesium chloride solution.

A 0.1 moles

B 100 moles

C 400 moles

D 0.4 moles

10. Calculate the number of moles of 200cm3 of a 2 moll-1copper sulphate solution.

A 0.1 moles

B 100 moles

C 400 moles

D 0.4 moles

11. Calculate the volume of a 1 moll-1copper chloride solution containing 10 moles of solute.

A 1 cm3

B 10 cm3

C 0.1 cm3

D 0.01 cm3

12. The equation for the reaction between sodium and water can be written as:

wNa + xH2O  yNaOH + zH2

where w, x, y and z are numbers.

The values for w, x, y and z (in order) are

  1. 2, 2, 2, 1
  2. 1, 1, 1, 2
  3. 1, 2, 2, 1
  4. 2, 2, 2, 2

13. The equation for the reaction between phosphorus and oxygen can be written as:

xP + yO2  zP2O5

where x, y and z are numbers.

The values for x, y and z (in order) are

  1. 2, 3, 2
  2. 4, 5, 2
  3. 4, 5, 1
  4. 2, 4, 2

14. The equation for the reaction between ammonia and oxygen can be written as:

wNH3 + xO2  yNO + zH2O

where w, x, y and z are numbers.

The values for w, x, y and z (in order) are

  1. 2, 2, 2, 3
  2. 4, 4, 4, 6
  3. 2, 4, 2, 3
  4. 4, 5, 4, 6

15. The balanced equation for the reaction of propane burning in oxygen is

C3H8 + 5O2  3CO2 + 4H2O

If 22 g of propane is burned completely in oxygen, the mass of carbon dioxide produced is

  1. 6.6 g
  2. 13.2 g
  3. 66 g
  4. 132 g

16. The manufacture of nitric acid from ammonia is known as the Ostwald process. In the first stage of the process ammonia gas is reacted with oxygen gas to produce nitrogen monoxide gas and steam. The reaction is exothermic. A platinum gauze catalyst is also used.

In the second stage of the process the nitrogen monoxide is allowed to react with more oxygen to form the brown gas nitrogen dioxide.

In the third stage of the process the nitrogen dioxide is reacted with water and oxygen to produce nitric acid (HNO3) as the only product.

a)Write a word equation for the first stage of the above process.

b)What is the chemical formula for nitrogen dioxide?

c)Write a word equation for the third stage of the process.

d)Write a chemical equation for the second stage of the process.

e)Write the ionic formula for nitric acid.

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