Werkblad Scheikunde voor toelatingsexamens verpleegkunde met antwoorden

Which gas is needed for a fuel to burn (combustion)?

1. AOxygen
2. BCarbon dioxide
3. CNitrogen
4. DHelium

What is absolute zero?

1. A−100 °C, the coldest temperature on Earth
2. B0 °C, the point at which pure water freezes into ice
3. C0 K, about −273 °C, the lowest possible temperature
4. D0 °F, the temperature of a salt and ice mixture

What is the half-life of a radioactive isotope?

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

Which halogen is the most reactive?

1. AFluorine
2. BChlorine
3. CBromine
4. DIodine

What is a polymer?

1. AA mixture of several different elements
2. BA small molecule containing only two atoms of one element
3. CA large molecule built from many repeating smaller units called monomers
4. DAn ion with more than one charge

At 20 °C, about 36 g of NaCl dissolves in 100 g of water. If 50 g of NaCl is stirred into 100 g of water at 20 °C, what happens?

1. AAbout 36 g dissolves and about 14 g stays undissolved
2. BNone of the salt dissolves
3. CAbout 14 g dissolves and about 36 g stays undissolved
4. DAll 50 g dissolves

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt stays exactly 7,40, because CO₂ does not affect pH
2. BIt rises, because less CO₂ means fewer H⁺ ions
3. CIt falls, because less CO₂ means more H⁺ ions
4. DIt falls, because oxygen is an acid

Welk type binding komt voor in een stuk koperdraad?

1. AWaterstofbruggen tussen koperatomen
2. BIonbinding tussen koper- en chloride-ionen
3. CCovalente binding met gedeelde paren tussen slechts twee atomen
4. DMetaalbinding: ionen in een zee van elektronen