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

What is a hydrocarbon?

1. AAny compound that dissolves in water
2. BA compound made of only hydrogen and carbon
3. CA compound made of hydrogen and oxygen
4. DA carbon atom with a positive charge

Какова химическая формула воды?

1. AH₂O
2. BH₂O₂
3. CHO₂
4. DOH

What is an element?

1. AA substance made of only one kind of atom
2. BA particle with an electric charge
3. CA substance of two or more elements chemically bonded together
4. DA physical mixture of different substances

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe mixture is formed by a chemical reaction between the two elements
2. BThe compound keeps the magnetic properties of iron
3. CThe mixture can be separated physically, for example with a magnet
4. DThe mixture has a fixed ratio of iron to sulfur

How should the volume of water in a graduated cylinder be read?

1. AFrom above the cylinder, at the top edge of the curved surface
2. BFrom below, at the highest point the water touches the glass
3. CAt any angle, from the middle of the cylinder
4. DAt eye level, from the bottom of the curved surface (meniscus)

A bag of 5% (w/v) glucose solution (called 5% dextrose in the US) contains 5 g of glucose per 100 mL. How many grams of glucose are in 1 L?

1. A0,5 g
2. B5 g
3. C50 g
4. D500 g

Zinc reacts as Zn + 2HCl → ZnCl₂ + H₂. What mass of zinc (65 g/mol) reacts completely with 50 mL of 2 M HCl?

1. A65 g
2. B6,5 g
3. C1,63 g
4. D3,25 g

Why is gamma radiation used to sterilise sealed medical supplies such as syringes?

1. AIt heats the items to very high temperatures, so the microbes are burned away inside the pack
2. BIt passes through the packaging and kills microbes without making the items radioactive
3. CIt adds a protective chemical coating to the items
4. DIt is stopped by the packaging, so it only cleans the outside