Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

At sea level, at what temperature does pure water freeze?

1. A0 °C (32 °F)
2. B−32 °C (−26 °F)
3. C100 °C (212 °F)
4. D32 °C (90 °F)

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A32 g/mol
2. B16 g/mol
3. C8 g/mol
4. D48 g/mol

What is the change from a liquid to a solid called?

1. AFreezing
2. BMelting
3. CCondensation
4. DEvaporation

Wat is de formule van aluminiumoxide, opgebouwd uit Al³⁺- en O²⁻-ionen?

1. AAl₂O₃
2. BAlO₃
3. CAlO
4. DAl₃O₂

What is the oxidation number of oxygen in most of its compounds?

1. A−1
2. B+2
3. C0
4. D−2

When mercury(II) oxide is heated, it reacts as 2HgO → 2Hg + O₂. What type of reaction is this?

1. ASingle replacement
2. BDecomposition
3. CSynthesis
4. DCombustion

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AThey stay active for many years, so a single dose can be used for every future scan
2. BThey give a strong signal for imaging but leave the body's tissues exposed only briefly
3. CThey emit only alpha particles, which are harmless inside the body
4. DShort half-life isotopes are not radioactive

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. AThe HCl molecules diffuse faster than NH₃ molecules
2. BThe lighter NH₃ molecules diffuse faster than HCl molecules
3. CBoth gases diffuse at the same speed
4. DThe white ring forms where the gases are heaviest