Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

What is the formula of methane, the main gas in natural gas?

1. ACH₂
2. BCO₂
3. CC₂H₆
4. DCH₄

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction releases heat
2. BThe reaction needs a catalyst
3. CThe reaction is reversible
4. DThe reaction is very fast

What is the half-life of a radioactive isotope?

1. AThe time taken for the mass of a sample to double in size
2. BHalf the number of protons in the nucleus
3. CThe time taken for half of the radioactive atoms in a sample to decay
4. DHalf the time it takes for all the atoms to decay

How does dissolving salt in water affect the water's boiling point?

1. AIt raises the boiling point slightly
2. BIt makes the water boil at room temperature
3. CIt has no effect on the boiling point
4. DIt lowers the boiling point slightly

Wat gebeurt er met de druk van een gas dat wordt verhit in een stijve, afgesloten houder?

1. ADie neemt toe
2. BDie blijft gelijk
3. CDie neemt af
4. DDie daalt tot nul

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AThe glass releases water when it gets cold
2. BWater leaks through tiny holes in the glass
3. CWater vapour in the air condenses on the cold glass
4. DThe ice evaporates through the glass

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. ANa⁺
2. BO²⁻
3. CF⁻
4. DMg²⁺

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. ACellulose is really made of amino acids, not glucose, so stomach acid cannot break it
2. BStarch contains nitrogen, which makes it easier to digest
3. CThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
4. DCellulose dissolves in water, so it is lost from the gut