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

At sea level, at what temperature does pure water freeze?

1. A−32 °C (−26 °F)
2. B32 °C (90 °F)
3. C0 °C (32 °F)
4. D100 °C (212 °F)

Which of these is a polyatomic ion?

1. AOxide, O²⁻
2. BSulfate, SO₄²⁻
3. CChloride, Cl⁻
4. DSodium, Na⁺

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ACondensation
2. BSublimation
3. CFreezing
4. DDeposition

What is a polymer?

1. AA mixture of several different elements
2. BA large molecule built from many repeating smaller units called monomers
3. CA small molecule containing only two atoms of one element
4. DAn ion with more than one charge

Which type of radiation can be stopped by a sheet of paper?

1. ABeta particles (fast electrons)
2. BX-rays
3. CAlpha particles
4. DGamma rays

What is the oxidation number of sulfur in H₂SO₄?

1. A+4
2. B+6
3. C+2
4. D−2

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA giant covalent network solid
2. BA metal with delocalised electrons
3. CA simple molecular (covalent) substance
4. DAn ionic compound (a lattice of ions)

Which of these is a redox reaction?

1. AZn + CuSO₄ → ZnSO₄ + Cu
2. BNaOH + HCl → NaCl + H₂O
3. CAgNO₃ + NaCl → AgCl + NaNO₃
4. DCaCO₃ → CaO + CO₂