Chemia na egzaminy wstępne na pielęgniarstwo: karta pracy z odpowiedziami

A blown-up balloon is put in a freezer. What happens to its volume?

1. AThe balloon bursts
2. BIt increases
3. CIt decreases
4. DIt stays exactly the same

According to the Arrhenius definition, what does an acid produce in water?

1. ASodium ions (Na⁺)
2. BHydrogen ions (H⁺)
3. CHydroxide ions (OH⁻)
4. DOxide ions (O²⁻)

Która substancja jest zasadą?

1. AWodorotlenek sodu (NaOH)
2. BSok z cytryny (kwas cytrynowy)
3. COcet (kwas octowy)
4. DKwas solny (HCl)

0,5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?

1. A0,125 M
2. B0,5 M
3. C125 M
4. D2 M

Jaka jest masa molowa wody (H = 1 g/mol, O = 16 g/mol)?

1. A17 g/mol
2. B32 g/mol
3. C10 g/mol
4. D18 g/mol

Which halogen is the most reactive?

1. AChlorine
2. BFluorine
3. CIodine
4. DBromine

Frying an egg turns the clear egg white solid and white. What happens to the proteins?

1. AThey are converted into fats
2. BThey are denatured: their shape changes, but the peptide bonds stay intact
3. CThey are hydrolysed, so the peptide bonds break into separate amino acids
4. DThey are burned to carbon dioxide and water

A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?

1. A11
2. B14
3. C3
4. D7