Volume 1
1.19. CHECK YOUR KNOWLEDGE
The first module of our course has come to an end and it is now time to check your knowledge (if you wish). Good luck!
1. Provide chemical names for the following substances: H2, O2, CuO, Cu2O, K2O, Al2O3, ZnO, Ba(OH)2, Fe(OH)2, Fe(OH)3, Na2CO3, MgSO4, CaCl2, H3PO4, HF, O3, KHSO4, Sr(NO3)2, SnCl2, Al2(SO4)3. What class of substances does each of the species belong to? Answer
2. Write chemical formulas for the following substances: water, hydrochloric acid, copper (II) oxide, copper (I) oxide, copper (I) chloride, cupric chloride, cuprous chloride, copper (II) chloride, sulfuric acid, phosphoric acid, nitric acid, tin (II) chloride, iron (III) chloride, iron (II) chloride, hydrobromic acid, potassium hydroxide, sodium bicarbonate. Answer
3. Are SO2 and SO3 allotropes? Answer
4. All simple substances that are solid and exhibit the characteristic silvery color are metals. True or false? Answer
5. Mercury is the only metal that is a liquid at room temperature (around 23 oC). Many metals dissolve in liquid mercury to give liquid alloys. What are such alloys called? Are they homogeneous or heterogeneous mixtures? Answer
6. Like hydrogen, oxygen, nitrogen, chlorine, and bromine, all other nonmetals are either gases or liquids at ambient temperature and atmospheric pressure. True or false? Answer
7. Is milk a homogeneous or heterogeneous mixture? Answer
8. Write a balanced chemical equation for the reaction of baking soda with HCl. Answer
9. You received from a supplier a bottle containing 100 g of concentrated HCl (36%). For your experiments, you need 20% HCl. How much water do you have to add to the concentrated HCl in the bottle to obtain 20% HCl? Answer
10. A thoroughly blended mixture of gases can be either homogeneous or heterogeneous. True or false? Answer
11. How can Ca(OH)2 be made from CaCO3? Answer
12. Only one of the two reactions below can occur. Which one?
(a) Hg(NO3)2 + Zn = Zn(NO3)2 + Hg
(b) Zn(NO3)2 + Hg = Hg(NO3)2 + Zn
Answer
13. How much pure KNO3 should be added to 50 g of 10% solution of KNO3 in order to make a 20% solution? Answer
14. There is a solid mixture of NaCl, sugar, sand (SiO2), and BaSO4. How can pure NaCl be isolated from this mixture? Answer
15. Write balanced chemical equations for the following reactions: (a) decomposition of hydrogen peroxide; (b) reduction of copper (II) oxide with hydrogen; (c) reaction of iron (III) hydroxide with sulfuric acid; (d) reaction of magnesium sulfate with barium chloride; (e) full neutralization of phosphoric acid with potassium hydroxide; (f) reaction of copper (II) oxide with hydrochloric acid; (g) combustion of white phosphorus in air; (h) reaction of sodium silicate with sulfuric acid; (h) reaction of sodium hydroxide with iron (II) sulfate; (i) combustion of methane; (j) reaction of sodium sulfate with sulfuric acid; (k) thermal decomposition of copper hydroxide; (l) reaction of zinc metal with sulfuric acid; (m) reaction of copper metal with phosphoric acid. Answer
16. Mother liquor is (a) a solution obtained as a result of filtration; (b) a solution after the dissolved substance has crystallized out; (c) the special liquor that some individuals give to their mothers on Mother's Day. Answer
17. In chemistry, sublimation is (a) a process where a solid becomes a gas without melting first; (b) a process where a gas becomes a solid without condensing to a liquid first; (c) a highly violent chemical reaction. Answer
18. The reaction of sodium with water is widely used in chemical laboratories to make hydrogen gas. True or false? Answer
19. Most metal hydroxides are easily soluble in water. True or false? Answer
20. Oxygen gas is a very important chemical compound. True or false? Answer
1. Provide chemical names for the following substances: H2, O2, CuO, Cu2O, K2O, Al2O3, ZnO, Ba(OH)2, Fe(OH)2, Fe(OH)3, Na2CO3, MgSO4, CaCl2, H3PO4, HF, O3, KHSO4, Sr(NO3)2, SnCl2, Al2(SO4)3. What class of substances does each of the species belong to? Answer
2. Write chemical formulas for the following substances: water, hydrochloric acid, copper (II) oxide, copper (I) oxide, copper (I) chloride, cupric chloride, cuprous chloride, copper (II) chloride, sulfuric acid, phosphoric acid, nitric acid, tin (II) chloride, iron (III) chloride, iron (II) chloride, hydrobromic acid, potassium hydroxide, sodium bicarbonate. Answer
3. Are SO2 and SO3 allotropes? Answer
4. All simple substances that are solid and exhibit the characteristic silvery color are metals. True or false? Answer
5. Mercury is the only metal that is a liquid at room temperature (around 23 oC). Many metals dissolve in liquid mercury to give liquid alloys. What are such alloys called? Are they homogeneous or heterogeneous mixtures? Answer
6. Like hydrogen, oxygen, nitrogen, chlorine, and bromine, all other nonmetals are either gases or liquids at ambient temperature and atmospheric pressure. True or false? Answer
7. Is milk a homogeneous or heterogeneous mixture? Answer
8. Write a balanced chemical equation for the reaction of baking soda with HCl. Answer
9. You received from a supplier a bottle containing 100 g of concentrated HCl (36%). For your experiments, you need 20% HCl. How much water do you have to add to the concentrated HCl in the bottle to obtain 20% HCl? Answer
10. A thoroughly blended mixture of gases can be either homogeneous or heterogeneous. True or false? Answer
11. How can Ca(OH)2 be made from CaCO3? Answer
12. Only one of the two reactions below can occur. Which one?
(a) Hg(NO3)2 + Zn = Zn(NO3)2 + Hg
(b) Zn(NO3)2 + Hg = Hg(NO3)2 + Zn
Answer
13. How much pure KNO3 should be added to 50 g of 10% solution of KNO3 in order to make a 20% solution? Answer
14. There is a solid mixture of NaCl, sugar, sand (SiO2), and BaSO4. How can pure NaCl be isolated from this mixture? Answer
15. Write balanced chemical equations for the following reactions: (a) decomposition of hydrogen peroxide; (b) reduction of copper (II) oxide with hydrogen; (c) reaction of iron (III) hydroxide with sulfuric acid; (d) reaction of magnesium sulfate with barium chloride; (e) full neutralization of phosphoric acid with potassium hydroxide; (f) reaction of copper (II) oxide with hydrochloric acid; (g) combustion of white phosphorus in air; (h) reaction of sodium silicate with sulfuric acid; (h) reaction of sodium hydroxide with iron (II) sulfate; (i) combustion of methane; (j) reaction of sodium sulfate with sulfuric acid; (k) thermal decomposition of copper hydroxide; (l) reaction of zinc metal with sulfuric acid; (m) reaction of copper metal with phosphoric acid. Answer
16. Mother liquor is (a) a solution obtained as a result of filtration; (b) a solution after the dissolved substance has crystallized out; (c) the special liquor that some individuals give to their mothers on Mother's Day. Answer
17. In chemistry, sublimation is (a) a process where a solid becomes a gas without melting first; (b) a process where a gas becomes a solid without condensing to a liquid first; (c) a highly violent chemical reaction. Answer
18. The reaction of sodium with water is widely used in chemical laboratories to make hydrogen gas. True or false? Answer
19. Most metal hydroxides are easily soluble in water. True or false? Answer
20. Oxygen gas is a very important chemical compound. True or false? Answer