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

Which type of radiation is the most penetrating?

1. AGamma rays
2. BAlpha particles
3. CBeta particles
4. DThey are all equally penetrating

Which property is typical of bases?

1. AThey have a pH below 7
2. BThey taste sour
3. CThey feel slippery
4. DThey turn blue litmus red

What is a dilute solution?

1. AOne in which the solute has reacted with the solvent
2. BOne with a small amount of solute in a lot of solvent
3. COne with no solvent at all
4. DOne with a large amount of solute in a little solvent

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the reactants
2. BThe equilibrium does not change
3. CThe reaction becomes endothermic
4. DThe equilibrium shifts toward the products, raising the yield

Как более высокая температура обычно влияет на то, сколько твёрдого вещества растворяется в воде?

1. AНа твёрдые вещества она не влияет
2. BТвёрдое вещество превращается в газ
3. CРастворяется больше твёрдого вещества
4. DРастворяется меньше твёрдого вещества

What is the oxidation number of sulfur in H₂SO₄?

1. A+4
2. B+6
3. C−2
4. D+2

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. ABoth gases diffuse at the same speed
2. BThe lighter NH₃ molecules diffuse faster than HCl molecules
3. CThe white ring forms where the gases are heaviest
4. DThe HCl molecules diffuse faster than NH₃ molecules

Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same formula, C₂H₆O, but ethanol boils at a much higher temperature. Why?

1. AEthanol has an O–H group, so its molecules form hydrogen bonds with each other
2. BDimethyl ether is ionic and ethanol is covalent
3. CEthanol has more carbon atoms
4. DEthanol molecules are heavier than dimethyl ether molecules