Робочий аркуш «Хімія для вступних іспитів на медсестринство» з відповідями

What does the rate of a reaction measure?

1. AHow much product forms in total by the end
2. BHow quickly reactants are used up or products are formed
3. CHow hot the reaction gets
4. DHow much energy the final products contain

What does the octet rule state?

1. AEvery stable atom has exactly 8 protons in its nucleus
2. BAn atom can form a maximum of 8 covalent bonds
3. CAtoms tend to gain, lose or share electrons to get 8 outer electrons
4. DEvery stable molecule contains exactly 8 atoms

Which element exists naturally as diatomic molecules (two atoms joined together)?

1. ASodium
2. BOxygen
3. CHelium
4. DIron

Which measurement has three significant figures?

1. A0,0056
2. B0,00560
3. C56
4. D5,0006

У реакції 2H₂ + O₂ → 2H₂O скільки моль води утвориться з 3 моль кисню?

1. A2 mol
2. B3 mol
3. C1,5 mol
4. D6 mol

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A500 g
2. B0,5 g
3. C5 g
4. D50 g

A compound is 40% carbon, 6,7% hydrogen and 53,3% oxygen by mass (C = 12, H = 1, O = 16). What is its empirical formula?

1. AC₂HO
2. BCHO
3. CCH₂O
4. DCH₄O

Зрівноважте __Fe + __O₂ → __Fe₂O₃ найменшими цілими числами. Які коефіцієнти?

1. A4, 3, 2
2. B4, 3, 4
3. C2, 3, 1
4. D2, 1, 1