Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

Which method separates sand from water?

1. ADistillation
2. BFiltration
3. CEvaporation of the sand
4. DChromatography

What does the coefficient 3 in "3H₂O" mean?

1. AWater has a charge of 3
2. BEach water molecule has three oxygen atoms
3. CEach molecule of water contains three hydrogen atoms
4. DThere are three molecules (or moles) of water

What is an unsaturated solution?

1. AA solution with no solute at all
2. BA solution with undissolved solid at the bottom
3. CA solution that can still dissolve more solute
4. DA solution that holds the maximum possible solute

How many lone (non-bonding) pairs of electrons are on the oxygen atom in a water molecule?

1. A0
2. B2
3. C1
4. D4

Jakie jest stężenie procentowe masowe soli w roztworze przygotowanym z 15 g soli i 135 g wody?

1. A15%
2. B11%
3. C90%
4. D10%

On an energy diagram, the products are at a lower energy than the reactants. What kind of reaction is shown?

1. AReversible only
2. BNuclear
3. CEndothermic
4. DExothermic

Which element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁵?

1. AArgon
2. BSulfur
3. CFluorine
4. DChlorine

Water is split as 2H₂O → 2H₂ + O₂. What volume of O₂ at STP (0 °C and 1 atm) forms from 2 mol of water?

1. A11,2 L
2. B22,4 L
3. C44,8 L
4. D67,2 L