Available Answers

1. 1.

   Explain the term 'chemical formula'. State why the molecular formula of zinc carbonate is 'ZnCO₃'. 

2. 2.

   Write the formula of the following compounds :

   1] Potassium -	a. chloride	b. nitrate	c.carbonate	d. bisulphate
   	e. sulphite	f. dichromate	g. permanganate	h. zincate
   	i. plumbite	j. sulphate	k. bicarbonate	l. aluminate
   	m. hydroxide	n. iodide	o. nitrite	p. bisulphate
   2] Sodium -	a. chloride	b. nitrate	c. carbonate	d. bisulphate
   	e. sulphite	f. dichromate	g. permanganate	h. zincate
   	i. plumbite	j. sulphate	k. bicarbonate	l. aluminate
   	m. hydroxide	n. iodide	o. nitrite	p. bisulphite
   3] Calcium -	a. chloride	b. nitrate	c. carbonate	d. bisulphite
   	e. sulphite	f. sulphate	g. bicarbonate	h. hydroxide
   4] Magnesium -	a. chloride	b. nitrate	c. carbonate	d. sulphate
   	e. bicarbonate	f. hydroxide	g. oxide
   5] Zinc -	a. chloride	b. nitrate	c. carbonate	d. sulphate
   	e. hydroxide	f. oxide
   6] Aluminium -	a. chloride	b. nitrate	c. carbonate	d. sulphate
   	e. hydroxide	f. oxide
   7] Copper -	a. Copper [I] chloride; Copper [II] chloride		b. Copper [I] oxide; Copper [II] oxide
   	c. Copper [II] nitrate; Copper [II] sulphate		d. Tetra amine copper [II] sulphate
   8] Iron -	a. Iron [II] chloride; Iron [III] chloride		b. Iron [II] oxide; Iron [III] oxide
   	c. Iron [II] sulphate; Iron [III] sulphate		d. Iron [II] sulphide; Iron [III] sulphide
   	e. Iron [II] hydroxide; Iron [III] hydroxide
   9] Lead -	a. Lead [II] chloride; Lead [II] oxide;		b. Lead [II] hydroxide; Lead [II] nitrate
   	c. Lead [II] sulphate
   10] Silver -	a. Silver [I]chloride; Silver [II] chloride;		b. Diamine silver chloride

    

3. 3.

   Write the names of the following compounds :

   a. KCIO	b. HCIO	c. NaClO3	d. AlN	e. K2Cr2O7
   f. KMnO4	g. Ca3N2	h. Ca3(PO4)2	i. H2SO3	j. HCI
   k. HNO3	l. H2SO4	m. NH4OH	n. NaOH	o. H2CO3
   p. HNO2	q. Mg(HCO3)2	r. NaAlO2	s. K2PbO2	t. Cr2(SO4)3
   u. Na2O

    

4. 4.

   Explain the term 'chemical equation'. What is meant by 'reactants' and 'products' in a chemical equation.

5. 5.

   Give an example of a chemical equation in which two reactants form -

   1. one product
   2. two products
   3. three products
   4. four products
6. 6.

   2KClO₃ ------^MnO_2-------> 2KCl + 3O₂[g] - is a balanced equation.

   1. State what is a 'balanced equation'.
   2. Give a reason why the above equation is balanced.
   3. State why the compound MnO₂ is written above the arrow.