Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

What is activation energy?

1. AThe energy stored in the products
2. BThe minimum energy reacting particles need for a reaction to happen
3. CThe energy needed to melt a solid
4. DThe total energy released once the reaction has finished

What does the rule "like dissolves like" mean?

1. AOnly substances with identical formulas can ever dissolve in each other
2. BSolids dissolve only in other solids
3. CEvery substance dissolves in water
4. DPolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones

In a chemical equation, what does the symbol (aq) after a formula mean?

1. ADissolved in water
2. BA pure liquid
3. CA gas
4. DA solid

What is the shape of a water molecule?

1. ATetrahedral
2. BBent
3. CLinear
4. DFlat triangle

Water has a high specific heat capacity. How does this help the human body?

1. AIt makes the blood more acidic
2. BIt allows oxygen to dissolve in water more easily
3. CIt helps keep body temperature stable
4. DIt makes water a poor solvent for salts

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 mixture can be separated physically, for example with a magnet
3. CThe mixture has a fixed ratio of iron to sulfur
4. DThe compound keeps the magnetic properties of iron

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. AH₂O
2. BNH₄⁺ only
3. CNH₃
4. DOH⁻

Welke stof wordt gereduceerd in de reactie CuO + H₂ → Cu + H₂O?

1. AWater, omdat het wordt gevormd
2. BKoper, omdat het elektronen afstaat
3. CKoperoxide, omdat koper elektronen opneemt
4. DWaterstof, omdat het zuurstof opneemt