17. The atomic number of the element 3s²3p¹ : A) 12 B) 17 C) 13 D) 14 18. Potassium has the number of energy levels: A) 3 B) 5 C) 1 D) 4
19. The number of neutrons in the atom A) 17 B) 15 C) 16 D) 14
20. What mass of hydrogen gas is produced when 48 g of Mg metal reacts with sulfuric acid solution? Mg+H₂SO₄→MgSO₄+H₂
A) 2g B) 8g C) 6g D) 4g
21. The chemical reaction: 2Ca + O₂ → 2CaO is a:
A) Decomposition B) Сombination C) Single displacement D) Double displacement
22. The chemical reaction BaCl₂ + H₂SO₄ → BaSO₄ + 2HCl is a:
A) Decomposition B) Сombination C) Single displacement D) Double displacement
23. From which group and period atom with 1s² 2s² 2p⁶ 3s²
A) 2A group and 3 period B) 4A group and 3period C) 3A group and 4 period D) 2A group and 4 period
24. 96g of magnesium (Mg) was burned in oxygen gas. Calculate the mass of magnesium oxide formed. 2Mg + O₂ → 2MgO
A) 100g B) 180g C) 160g D) 140g
25. Calculate the relative density of chlorine gas (С

elvinpirimov1    3   15.02.2021 12:02    0