Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

In a chemical equation, what are the reactants?

1. AThe new substances formed, written to the right of the arrow
2. BThe starting substances, written to the left of the arrow
3. CThe numbers written in front of each formula
4. DThe catalysts written above the arrow

What does organic chemistry study?

1. ACompounds made of metals
2. BOnly the noble gases
3. CCompounds based on carbon
4. DOnly compounds found in plants

What is the melting point of a substance?

1. AThe temperature at which its solid turns into a liquid
2. BThe temperature at which it dissolves in water
3. CThe temperature at which its liquid turns into a gas
4. DThe temperature at which it catches fire

A room is at 25 °C. What is this temperature in kelvin?

1. A−248 K
2. B77 K
3. C248 K
4. D298 K

Why does ice float on liquid water?

1. AIce has a higher mass than the same volume of water
2. BIce contains trapped air from the freezer
3. CIce is less dense than liquid water
4. DIce is denser than liquid water

In the balanced equation __Mg + __HCl → __MgCl₂ + __H₂, what is the coefficient of HCl?

1. A4
2. B2
3. C1
4. D3

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

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

Why does food cook faster in a pressure cooker?

1. AThe higher pressure lowers the boiling point
2. BPressure itself breaks down the food, regardless of temperature
3. CSteam is trapped, so the water boils at a lower temperature
4. DThe higher pressure raises the boiling point, so the water is hotter