1. Identify the salts from the following formulas: Which of the following sets consists only of salts? 1) Na2SO3

1. Identify the salts from the following formulas:
Which of the following sets consists only of salts?
1) Na2SO3, KCl, H3PO4
2) Fe2(SO4)3, CuCl, AgNO3
3) SO3, Ba(NO3)2, CuС12
4) CaSO4, Cs(OH)2, K2CO3

2. Determine which substance is not an alkali:
1) NaOH
2) Ba(OH)2
3) KOH
4) Cu(OH)2

3. Identify the acid with the formula H2SO4:
1) sulfurous
2) sulfite
3) hydrogen sulfide
4) sulfuric

4. Provide the formula for calcium carbonate:
1) Ca(NO3)2
2) Ca(OH)2
3) CaCO3
4) Ca(CO3)3

5. Determine the name of the substance Mn(OH)2:
1) manganese(II) hydride
2) copper(II) hydroxide
3) manganese(II) hydroxide
4) manganese(II) oxide

6. Identify the acid present in gastric juice:
1) sulfuric
2) sulfurous
3) hydrochloric
4) hydrogen sulfide

7. Count the number of acids among the given substance formulas: Cu(OH)2, H2SO4, K2SO3, Ba(NO3)2, CuSO4, Na3PO4, KОН, H3PO4
The number of acids is:
1) 1
2) 2
3) 3
4) 4

8. Determine the values of x and y in the formula Alx(SO4)y:
1) 2 and 1
2) 1 and 2
3) 3 and 2
4) 2 and 3

9. In an acidic environment, what color does litmus indicator turn?
1) blue
2) red
3) colorless
4) violet

10. Calculate the number of particles in 10 moles:
1) 0.6 x 10^23
2) 6 x 10^24
3) 3 x 10^23
4) 0.3 x 10^23

11. What does 8.96 liters correspond to in moles?
1) 0.1 mole
2) 0.2 mole
3) 0.3 mole
4) 0.4 mole

12. Match the substance formulas with their names:
A) K3PO4
B) KOH
C) K2O
D) K2CO3
The names of the substances are:
1) potassium carbonate
2) potassium fluoride
3) potassium phosphate
4) potassium oxide
5) potassium sulfite
6) potassium hydroxide

13. Calculate the masses of salt and water needed to prepare a 500 g 12% solution.

14. What volume of hydrogen gas will be produced when 2.7 g of aluminum reacts with hydrochloric acid?

15. Balance the chemical equations and specify the types of chemical reactions:
1) MgO + HNO3 → Mg(NO3)2 + H2O
2) Fe(NO3)2 → FeO + NO2 + O2
3) Cl2O7 + H2O → HClO4