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

What does the prefix "milli-" mean?

1. AOne-thousandth (10⁻³)
2. BOne thousand (10³)
3. COne-millionth (10⁻⁶)
4. DOne-hundredth (10⁻²)

What are the units of molarity?

1. AGrams of solute per litre of solution (g/L)
2. BMoles of solute per kilogram of the solvent used
3. CGrams of solute per 100 g of solution
4. DMoles of solute per litre of solution (mol/L)

What is radioactivity?

1. AThe flow of electrons through a metal wire
2. BThe glow produced by any hot object
3. CThe release of radiation by unstable atomic nuclei
4. DThe release of heat and light when fuels burn in air

Which reacts more vigorously with water, potassium or sodium?

1. ASodium, because its outer electron is farther from the nucleus
2. BSodium, because it has fewer electron shells to shield its electron
3. CThey react equally, because both are in group 1
4. DPotassium, because its outer electron is farther from the nucleus

A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?

1. A750 mmHg
2. B253 mmHg
3. C760 mmHg
4. D600 mmHg

Which list is in order from smallest to largest mass?

1. AKilogram, gram, milligram
2. BMilligram, kilogram, gram
3. CMilligram, gram, kilogram
4. DGram, milligram, kilogram

Яка з цих кислот слабка?

1. AНітратна кислота
2. BХлоридна кислота
3. CСульфатна кислота
4. DОцтова кислота (в оцті)

A strip of magnesium is burned in air and the white ash weighs more than the original strip. Why?

1. AOxygen from the air has combined with the magnesium
2. BMass was created during the reaction
3. CThe ash absorbed water from the flame
4. DMagnesium atoms became heavier when heated