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

According to collision theory, what must happen for particles to react?

1. AThey must collide with enough energy and the right orientation
2. BThey must have the same mass
3. CThey must stay completely still next to each other
4. DThey must both be in the solid state at the same time

What are the building blocks of carbohydrates such as starch?

1. AMonosaccharides (simple sugars) such as glucose
2. BNucleotides
3. CFatty acids joined to a glycerol molecule
4. DAmino acids

What does the law of conservation of mass state?

1. AThe mass of products is always greater than the mass of reactants
2. BMass is neither created nor destroyed in a chemical reaction
3. CMass is lost as heat in every reaction
4. DGases have no mass

What is the molar mass of sulfuric acid, H₂SO₄ (H = 1, S = 32, O = 16 g/mol)?

1. A49 g/mol
2. B50 g/mol
3. C98 g/mol
4. D96 g/mol

Which measurement has three significant figures?

1. A5,0006
2. B0,00560
3. C56
4. D0,0056

Which gas forms when hydrochloric acid reacts with calcium carbonate?

1. ACarbon dioxide
2. BHydrogen
3. CChlorine
4. DOxygen

Hyperbaric oxygen therapy places a patient in a chamber with oxygen at higher than normal pressure. Why does this raise the oxygen dissolved in blood plasma?

1. AHigher pressure turns the oxygen into a liquid
2. BGas solubility in a liquid increases with the partial pressure of the gas
3. CHigher pressure makes red blood cells divide faster
4. DHigher pressure lowers body temperature, so the blood can hold much more gas

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AThe outside air pressure is lower, so the gas inside expands
2. BThe bag becomes thinner and weaker at altitude
3. CThe gas inside the bag is heated strongly by the mountain sunlight
4. DMore gas is produced by the crisps at altitude