Scheda di esercizi di Chimica per i test di ammissione a infermieristica con soluzioni

Standard atmospheric pressure (1 atm) is equal to how many millimetres of mercury?

1. A100 mmHg
2. B1000 mmHg
3. C120 mmHg
4. D760 mmHg

What are enzymes?

1. ASugars that store energy in the liver
2. BMinerals that build bone
3. CBiological catalysts, usually proteins
4. DFats that form most of the cell membrane

Which property is typical of bases?

1. AThey taste sour
2. BThey feel slippery
3. CThey have a pH below 7
4. DThey turn blue litmus red

According to the Brønsted–Lowry definition, what is an acid?

1. AA proton (H⁺) acceptor
2. BAn electron pair donor
3. CA proton (H⁺) donor
4. DA hydroxide ion donor

Water can act as an acid in some reactions and as a base in others. What is such a substance called?

1. AAmphoteric
2. BIsotonic
3. CNeutral
4. DSaturated

What is the molar mass of calcium carbonate, CaCO₃ (Ca = 40, C = 12, O = 16 g/mol)?

1. A100 g/mol
2. B84 g/mol
3. C116 g/mol
4. D68 g/mol

Why does drinking seawater make dehydration worse?

1. ASeawater contains no water molecules the body can use
2. BSeawater is hypertonic, so the body loses extra water getting rid of the salt
3. CSeawater is isotonic, so it cannot be absorbed
4. DSeawater is hypotonic, so water rushes into cells and makes them burst

Making ammonia (N₂ + 3H₂ ⇌ 2NH₃) is exothermic. A low temperature would give a higher yield, yet factories use a moderately high temperature. Why?

1. AThe catalyst only works when the reaction is endothermic
2. BAt low temperatures the reaction is too slow to be useful
3. CHigher temperatures shift the equilibrium toward more ammonia
4. DLow temperatures would make the ammonia explode