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

Which unit is commonly used for the density of a liquid?

1. AmL/g
2. Bkg
3. Cg/mL
4. Dg·mL

Which method separates two liquids with different boiling points, such as alcohol and water?

1. AUsing a magnet
2. BDistillation
3. CSieving
4. DFiltration

What is the formula of sulfuric acid?

1. AHCl
2. BH₂SO₄
3. CHNO₃
4. DH₂SO₃

A room is at 25 °C. What is this temperature in kelvin?

1. A298 K
2. B−248 K
3. C77 K
4. D248 K

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BMass number falls by 2 and atomic number falls by 4
3. CNeither changes
4. DMass number falls by 4 and atomic number falls by 2

To which family of organic compounds does ethanol, C₂H₅OH, belong?

1. ACarboxylic acids
2. BAlcohols
3. CEsters
4. DAlkanes

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A7
2. B11
3. C14
4. D3

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AShort half-life isotopes are not radioactive
2. BThey emit only alpha particles, which are harmless inside the body
3. CThey give a strong signal for imaging but leave the body's tissues exposed only briefly
4. DThey stay active for many years, so a single dose can be used for every future scan