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

Qual è il pH dell'acqua pura a 25 °C?

1. A14
2. B1
3. C7
4. D0

Quale tipo di legame si forma quando gli elettroni sono condivisi tra atomi?

1. AUn legame covalente
2. BUn legame nucleare
3. CUn legame ionico
4. DUn legame metallico

What is an unsaturated solution?

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

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the reactants
2. BThe reaction becomes endothermic
3. CThe equilibrium shifts toward the products, raising the yield
4. DThe equilibrium does not change

Which substance is a non-electrolyte when dissolved in water?

1. ASodium chloride
2. BHydrochloric acid
3. CPotassium chloride
4. DGlucose

What is the normal boiling point of a liquid?

1. AThe temperature at which its particles stop moving
2. BThe temperature at which it first starts to evaporate
3. CThe temperature at which its density is greatest
4. DThe temperature at which its vapour pressure equals 1 atmosphere

10 g di una sostanza si sciolgono in acqua formando 250 mL di soluzione. Qual è la sua concentrazione in g/L?

1. A40 g/L
2. B2,5 g/L
3. C25 g/L
4. D0,04 g/L

Sugar is heated in a pan. Which observation shows that a chemical change, not just a physical change, has happened?

1. AThe crystals become smaller when crushed
2. BIt turns black and gives off water vapour, leaving a solid that is no longer sweet
3. CIt melts into a clear, runny liquid that sets again when it cools
4. DIt gets hot to the touch