Химия для вступительных экзаменов на сестринские программы: лист заданий с ответами

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

1. ADistillation
2. BUsing a magnet
3. CSieving
4. DFiltration

What is activation energy?

1. AThe minimum energy reacting particles need for a reaction to happen
2. BThe total energy released once the reaction has finished
3. CThe energy stored in the products
4. DThe energy needed to melt a solid

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A0,5
2. B1
3. C2
4. D3

What is nuclear fission?

1. AThe burning of uranium in oxygen
2. BThe splitting of a heavy nucleus into smaller nuclei
3. CThe joining of two light nuclei to form a heavier nucleus
4. DThe loss of electrons from an atom

Why do group 1 metals such as sodium react so easily?

1. ATheir nuclei contain no neutrons
2. BThey easily gain one extra electron
3. CThey have a full outer shell of electrons
4. DThey have one outer electron that is easily lost

Why can a very high fever disrupt the body's chemical reactions?

1. AHigh temperatures can change the shape of enzymes so they stop working
2. BHigh temperatures turn enzymes into fats
3. CHigh temperatures make every enzyme work faster without any limit
4. DHigh temperatures remove the water from blood

Which compound contains both ionic and covalent bonds?

1. AMethane, CH₄
2. BWater, H₂O
3. CSodium sulfate, Na₂SO₄
4. DSodium chloride, NaCl

How many grams of NaCl are in 250 mL of 0,9% (w/v) normal saline?

1. A22,5 g
2. B9 g
3. C2,25 g
4. D0,9 g