**Control work 1**

1. Calculate the number of particles contained in 0.5 mol of sulfur dioxide gas.

2. Calculate the mass of 2 mol of nitric acid.

3. Calculate the number of particles contained in 10 g of water.

4. Calculate the mass fractions of the elements in potassium permanganate.

5. Determine the molecular formula of a substance consisting of nitrogen and hydrogen if the mass fraction of hydrogen in this substance is 18%.

6. Characterize element P (position in PCE, atom structure, possible oxidation states, formulas of complex substances).

7. What type of bonding and type of crystal lattice is formed between atoms with charges +15 and +1. Make molecular, electron-dot and structural formulas of such a compound.

8. To 200 g of 5% sodium nitrate solution added 5 g of nitrate and 20 g of water. Calculate the mass fraction of nitrate in the new solution.

9. Which of the following substances will lead(II) chloride interact with: hydrochloric acid, sodium hydroxide, aluminum hydroxide, sodium nitrate? Write the equation of reaction in molecular and ionic form.

10. Calculate the volume of gas that will be released when ammonium chloride interacts with 5 g of calcium hydroxide.

**Term paper №1**

1. Calculate the number of particles contained in 0.5 mol of sulfur dioxide gas.

2. Calculate the mass of 2 mol of nitric acid.

3. Calculate the number of particles contained in 10 g of water.

4. Calculate the mass fractions of the elements in potassium permanganate.

5.Determine the molecular formula of a substance consisting of nitrogen and hydrogen if the m ass fraction of hydrogen in this substance is 18%.

6. Characterize element P (position in PCE, atom structure, possible oxidation states, formulas of complex substances).

7. What type of bonding and type of crystal lattice is formed between atoms with charges +15 and +1. Make molecular, electron-dot and structural formulas of such a compound.

8. To 200 g of 5% sodium nitrate solution added 5 g of nitrate and 20 g of water. Calculate the mass fraction of nitrate in the new solution.

9.Which of the following substances will lead(II) chloride interact with: hydrochloric acid, sodium hydroxide, aluminum hydroxide, sodium nitrate? Write the equation of reaction in molecular and ionic form.

10. Calculate the volume of gas that will be released when ammonium chloride interacts with 5 g of calcium hydroxide.

**Term paper №1**

**Option I**

1. Calculate the number of particles contained in 0.1 mol of carbon dioxide.

2. Calculate the mass of 5 mol of sulfuric acid.

3. Calculate the number of particles contained in 5 g of hydrogen chloride.

4. Calculate the mass fractions of the elements in potassium silicate.

5.Determine the molecular formula of a substance composed of carbon and oxygen if the mass fraction of oxygen in this substance is 57%.

6. Characterize element C (position in PCCE, atom structure, possible oxidation states, formulas of complex substances).

7. What type of bonding and type of crystal lattice is formed between atoms with charges +14 and +1. Make molecular, electron-dot and structural formulas of such a compound.

8. To 300 g of 15% potassium nitrate solution added another 200 g of water. Calculate the mass fraction of nitrate in the new solution.

9. With which of the following substances will manganese nitrate (II) interact: sulfuric acid, potassium hydroxide, iron (III) hydroxide, sodium nitrate? Write the equation of reaction in molecular and ionic form.

10. Calculate the mass of salt formed in the interaction of barium chloride with 10 g of sulfuric acid.

**Control work №1**

**Option 2**

1. Calculate the number of particles contained in 5 mol of carbon monoxide.

2. Calculate the mass of 4 mole of orthophosphoric acid.

3. Calculate the number of particles contained in 1 g of hydrogen sulfide.

4. Calculate the mass fractions of the elements in barium carbonate.

5. Determine the molecular formula of a substance consisting of phosphorus and oxygen if the mass fraction of oxygen in this substance is 43.6%.

6. Characterize element Si (position in PCCE, atom structure, possible oxidation states, formulas of complex substances).

7. What type of bonding and type of crystal lattice is formed between atoms with charges +6 and +1. Make molecular, electron-dot and structural formulas of such a compound.

8. To 120 g of 15% salt solution add 2 g of salt. Calculate the mass fraction of salt in the new solution.

9. Which of the following substances will iron (II) chloride interact with: hydrochloric acid, sodium hydroxide, zinc hydroxide, potassium nitrate? Write the equation of reaction in molecular and ionic form.

10. Calculate the mass of salt formed in the interaction of silver nitrate with 15 g of hydrochloric acid.