Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

What does the rate of a reaction measure?

1. AHow hot the reaction gets
2. BHow much product forms in total by the end
3. CHow much energy the final products contain
4. DHow quickly reactants are used up or products are formed

Which of these is a chemical property?

1. AFlammability
2. BDensity
3. CBoiling point
4. DColour

Elements in the same period of the periodic table have the same number of what?

1. ANeutrons
2. BProtons
3. CValence electrons
4. DOccupied electron shells

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

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

How does a catalyst speed up a reaction?

1. AIt provides a different pathway with a lower activation energy
2. BIt adds extra reactant to the mixture
3. CIt makes the reaction more exothermic
4. DIt raises the temperature of the reactants so they move faster

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 compound keeps the magnetic properties of iron
4. DThe mixture has a fixed ratio of iron to sulfur

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANaCl
2. BNa⁺
3. CNa
4. DCl₂

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. ABoth are metalloids
2. BA is a reactive metal and B is a reactive nonmetal
3. CA is a nonmetal and B is a metal
4. DBoth are unreactive because they are in the same period