Phiếu bài tập Hóa học cho kỳ thi đầu vào điều dưỡng có đáp án

Between which kinds of elements do covalent bonds usually form?

1. ATwo nonmetals
2. BA metal and a noble gas
3. CA metal and a nonmetal
4. DTwo group 1 metals

What is an electrolyte?

1. AA substance that forms ions and conducts electricity when dissolved in water
2. BA substance that dissolves as whole molecules without forming any ions
3. CA metal that conducts electricity as a solid
4. DA gas that dissolves in blood

Which two substances must be present for iron to rust?

1. ANitrogen and water
2. BCarbon dioxide and salt
3. CHydrogen and oxygen gas only
4. DOxygen and water

In a closed container, 10 g of substance A reacts completely with 5 g of substance B. What is the total mass of the products?

1. A50 g
2. B15 g
3. C5 g
4. D10 g

What is nuclear fission?

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

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 remove the water from blood
3. CHigh temperatures turn enzymes into fats
4. DHigh temperatures make every enzyme work faster without any limit

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A24 atm
2. B4 atm
3. C2,4 atm
4. D1 atm

A carboxylic acid reacts with an alcohol in the presence of an acid catalyst. What are the products?

1. AAn alkane and oxygen
2. BA salt and hydrogen
3. CAn ester and water
4. DAn amino acid and carbon dioxide