Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

Do której grupy należą sód i potas?

1. ADo gazów szlachetnych (grupa 18)
2. BDo fluorowców (grupa 17)
3. CDo berylowców (grupa 2)
4. DDo litowców (grupa 1)

What is the SI unit of energy?

1. AKelvin
2. BWatt
3. CJoule
4. DNewton

What are the units of molarity?

1. AMoles of solute per litre of solution (mol/L)
2. BGrams of solute per litre of solution (g/L)
3. CGrams of solute per 100 g of solution
4. DMoles of solute per kilogram of the solvent used

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

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

How many molecules are in 2 mol of carbon dioxide?

1. A1,20 × 10²⁴
2. B6,02 × 10²³
3. C2,00 × 10²³
4. D3,01 × 10²³

Why does the vapour pressure of a liquid increase as it is heated?

1. AThe attractions between the molecules become stronger
2. BMore molecules have enough energy to escape into the gas phase
3. CThe molecules become heavier and press harder on the surface
4. DThe liquid's volume decreases and squeezes out vapour

A sealed bag of crisps (potato chips) packed at sea level looks puffed up when it is carried to a high mountain. Why?

1. AThe bag becomes thinner and weaker at altitude
2. BThe outside air pressure is lower, so the gas inside expands
3. CThe gas inside the bag is heated strongly by the mountain sunlight
4. DMore gas is produced by the crisps at altitude

Which phase change absorbs energy from the surroundings (is endothermic)?

1. AFreezing
2. BCondensation
3. CDeposition
4. DSublimation