Worksheets and Answers Chemical Formulas, Nomenclature, Reaction Equations, and Basic Laws of Chemistry

1. The name of the compound Mg3N2 is... A. manganese nitrogenide B. manganese nitride C. magnesium nitrogenide D. magnesium nitride E. magnesium nitrate

2.  The correct chemical formula for nitrogen pentoxide is... A. N2O5 D. N2O B. N2O4 E. NO C. N2O3 

3. Calcium ions combine with phosphate ions to form calcium phosphate compounds with the chemical formula... A. CaPO3 D. Ca2(PO4)3 B. CaPO4 E. Ca2(PO3)2 C. Ca3(PO4)2

 4. The correct name for the compound CH3COOH is... A. oxalic acid D. acetic acid B. carbonic acid E. carboxylic acid C. chromic acid 

5. Know the equation for the reaction MgO(s) + H2SO4 (aq) --> MgSO4 (aq) + H2O (l) The names of the reactants (reactants) in the above reaction are.. A. magnesium oxide and sulfuric acid B. manganese oxide and sulfuric acid C. manganese oxide and hydrogen sulfide D. magnesium oxide and hydrogen sulfide E. magnesium monoxide and sulfuric acid



6. The name of the compound with the chemical formulas Na2S, KNO2, and CaCO3 is ... A. sodium sulfate, potassium nitrate, and calcium carbonate B. sodium sulfide, potassium nitrate, and calcium carbonite C. sodium sulfide, potassium nitrite, and calcium carbonate D. sodium sulfide, potassium nitrate, and calcium carbonite E. sodium sulfate, potassium nitrate, and calcium carbonate 

7. The following equation is known: MnO2(s) + HCl (l) ----> aMnCl2(aq) + bH2O(l) + cCl2(g) If it is equalized, then the prices of a, b, c are... A. 1-1-1 D. 1-1-2 B. 1-2-1 E. 2-1-1 C. 2-2-1

 8. The combustion reaction of butane gas (C4H10) is written by the reaction equation: aC4H10(g) + bO2(g) ------> cCO2(g) + dH2O(l) after equating, then apply ... A. a = c+d D. b = 1/2 d B. if a = 1, then the price of b = 7 E. b = c+1/2d C. b = c+d

 9. Zinc metal reacts with hydrochloric acid solution to produce zinc chloride solution and hydrogen gas. The statement in a chemical reaction is written as... A. Zn(s) + HCl (aq) -----> ZnCl(aq) + H (g) 

10. from the reaction equation: Mg3N2(s) + H2O(l) ----> Mg(OH)2(aq) + NH3(g) after being balanced, then the coefficient of H2O is ... A. 2 B. 3 C. 4 D. 5 E. 6

11. The equation for the reaction is known: MnO2(s) + HCl(aq) -----> MnCl2(aq) + H2O(l) + Cl2(g) After balancing, the coefficient of hydrochloric acid is... A. 1 B. 2 C. 3 D. 4 E. 5 

12. Magnesium powder with a mass of 3 grams reacts with a certain amount of sulfur powder to produce a compound of magnesium sulfide with a mass of 7 grams. The mass of sulfur powder that has reacted is... A, 10 g B. 7 g C. 4 g D. 3 g E. 1 g 

13. Iodine crystals with a mass of 10 grams are reacted with 10 grams of hydrogen gas. After reacting, it turns out that 2.5 grams of hydrogen iodide gas are obtained. The mass of the unreacted substance is... C. (10 + 10) - 2.5 g 

14. In the CaS compound, the ratio of the mass of Ca: S = 5: 4. If 10 grams of calcium is reacted with 9 grams of sulfur powder, the mass of CaS produced is .. A. 9 grams B. 9.5 grams C. 10 grams D. 18 grams E. 19 grams 

15. If in FeS compound the ratio of mass of Fe : S = 7 : 4, then to produce 4.4 grams of FeS compound, Fe and S are required as much as ... A. 4.0 grams and 0.4 grams B. 3.7 grams and 0.7 grams C. 2.8 grams and 1.6 grams D. 3.0 grams and 1.4 grams E. 3.2 grams and 1.2 grams



16. Elements A and B form two kinds of compounds with the following composition:


compound Mass A Mass B
I 60% 40%
II 50% 50%


The ratio of the masses of A in compounds I and II at a constant mass B is


A. 1:1 C. 2:1 E. 3:2


B. 1:2 D. 2:3





17. Sulfur dioxide gas is reacted with oxygen gas with the following equation:


SO2(g) + O2(g) ----> SO3(g)


If the volume is measured at the same temperature and pressure, then the ratio of the volume of gas SO2: O2: SO3 is...


A. 1:1:1 C. 2:1:1 E. 3:2:1


B. 1:2:1 D. 2:1:2














18. Propane gas (C3H8) is completely burned by the reaction:


C3H8(g) + O2(g) ----> CO2(g) + H2O(g)


To burn completely every liter of propane gas, it takes as much oxygen gas as ..


A. 1 liter C. 3.5 liter E. 5.0 liter


B. 3 liters D. 4.0 liters














19. Every 1 liter of nitrogen gas is used up, it reacts with 2.5 liters of oxygen gas to form 1 liter of nitrogen oxide gas. If the volume is measured at the same temperature and pressure, the molecular formula for the nitrogen oxide is...
A. N2O C. N2O3 E. N2O5
B. NO D. NO2


20. Complete combustion of ammonia gas requires oxygen gas with the reaction equation:
NH3(g) + O2(g) ----> NO2(g) + H2O (g)
Assuming that the oxygen content in the air is 20%, then the volume of air needed to burn 4 liters of ammonia gas is...
A. 5 liters C. 10 liters E. 35 liters
B. 7 liters D. 20 liters


21. Consider the following equation for the formation of a gas: 3Cu(s) + 8HNO3(aq) ----> 3Cu(NO3)2(aq) + 2NO(g) + 4H2O(l) The name of the substance that is not involved in the equation is... A. nitric acid C. nitrogen dioxide E. water B. copper(II) nitrate D. nitrogen monoxide 

22. The ratio of the masses of the elements in a compound is always the same everywhere. It is known that the element H in H2O is 4 grams, while the ratio of the elements H and O in a compound is 1:8. The mass of element O in the compound is ... grams A. 4 C. 10 E. 40 B. 8 D. 32 

23. Consider the following equation for the formation of SO3 gas: 2SO2(g) + O2(g) ----> 2SO3(g) If the oxygen gas that has reacted is 12 liters, then the volume of SO3 gas produced is... A. 6 liters C. 18 liters E. 36 liters B. 12 liters D. 24 liters 

24. Consider the following reaction equation: Ca3(PO4)2(s) + SiO2(s) + C(s) ----> CaSiO3(s) + CO(g) + P4(s) The name of the compound that is not involved in the equation is... A. calcium silicate C. carbon monoxide E. potassium phosphate B. calcium phosphate D. silicon dioxide 

25. A total of 2 liters of methane gas is burned completely according to the following equation: CH4(g) + 2O2(g) ---> CO2(g) + 2H2O(g) The volume of oxygen gas required is... A. 2 liters C. 4 liters E. 6 liters B. 3 liters D. 5 liters 

26. Reacted a number of magnesium metal with a solution of hydrochloric acid to produce a solution of magnesium chloride and hydrogen gas. The correct equation for this reaction is... B. Mg(s) + 2HCl(aq) ---> MgCl2(aq) + H2(g)




27. A mixture of CH4 and C3H8 gases with a volume of 10 liters is completely burned with O2 gas. If measured at the same temperature and pressure, it turns out that the volume of CO2 gas is 24 liters. The volumes of CH4 gas and C3H8 gas are respectively... A. 3 liters and 7 liters C. 5 liters and 5 liters E. 7 liters and 3 liters B. 4 liters and 6 liters D. 6 liters and 4 liters 

28. Among the following groups of compounds which is the empirical formula is ... A. P2O5 and CH2O C. CH3COOH and C6H6 E. C3H8 and C6H14 B. P4O10 and C4H8 D. C6H12O6 and C2H6O 

29. Known reaction: aC3H8(g) + bO2(g) ----> cCO2(g) + dH2O(g) If the reactions are balanced, then the values ​​of a, b, c, and d are... A. 2,5,6,2 C. 2,10,4,4 E. 1,5,3,4 B. 1,3,3,4 D. 1,4,3,2 

30. In the reaction: aK2MnO4(aq) + bHCl(aq) ---> MnO2(aq) + cKMnO4(aq) + dKCl(aq) + eH2O(l) The values ​​for a, b, c, d and e are... A. 3-4-2-4-2 C. 3-2-4-2-4 E. 3-2-2-4-2 B. 2-4-2-3-2 D. 1-4-2-3-2 

31. On complete combustion 160 mL. A mixture of methane (CH4) and propane (C3H8) gas requires 500 mL of oxygen gas. The volume percentage of propane gas in the mixture is... A. 37.5% C. 56.6% E. 75% B. 43.7% D. 62.5%