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

What is a hydrocarbon?

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

What kind of carbon–carbon bonds do alkanes contain?

1. AAt least one triple bond
2. BIonic bonds
3. COnly single bonds
4. DAt least one double bond

A blown-up balloon is put in a freezer. What happens to its volume?

1. AIt decreases
2. BThe balloon bursts
3. CIt increases
4. DIt stays exactly the same

How does an antacid tablet relieve heartburn caused by excess stomach acid?

1. AIt turns the acid into a gas that is absorbed
2. BIt coats the stomach and stops all acid production
3. CAn acid in it lowers the stomach pH further
4. DA weak base in it neutralises some of the acid

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number falls by 4 and atomic number falls by 2
2. BNeither changes
3. CMass number stays the same and atomic number rises by 1
4. DMass number falls by 2 and atomic number falls by 4

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

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

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA giant covalent network solid
2. BA metal with delocalised electrons
3. CA simple molecular (covalent) substance
4. DAn ionic compound (a lattice of ions)

Magnesium burns as 2Mg + O₂ → 2MgO. What mass of MgO (40 g/mol) forms from 48 g of Mg (24 g/mol)?

1. A80 g
2. B160 g
3. C40 g
4. D48 g