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

Which three elements make up carbohydrates?

1. AHydrogen, nitrogen and phosphorus
2. BCarbon, hydrogen and nitrogen
3. CCarbon, nitrogen and sulfur
4. DCarbon, hydrogen and oxygen

What is an electrolyte?

1. AA gas that dissolves in blood
2. BA substance that dissolves as whole molecules without forming any ions
3. CA substance that forms ions and conducts electricity when dissolved in water
4. DA metal that conducts electricity as a solid

What is an acid–base indicator?

1. AA gas given off by acids
2. BA device that measures temperature
3. CA substance that changes colour depending on pH
4. DA substance that neutralises every acid

A temperatura costante il volume di un gas si dimezza. Che cosa accade alla sua pressione?

1. ARaddoppia
2. BDiventa quattro volte più piccola
3. CResta uguale
4. DSi dimezza

Si diluiscono 100 mL di una soluzione 2 M fino a un volume totale di 400 mL. Qual è la nuova concentrazione?

1. A8 M
2. B2 M
3. C1 M
4. D0,5 M

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AWater vapour in the air condenses on the cold glass
2. BWater leaks through tiny holes in the glass
3. CThe ice evaporates through the glass
4. DThe glass releases water when it gets cold

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. AO²⁻
2. BF⁻
3. CNa⁺
4. DMg²⁺

A compound is 40% carbon, 6,7% hydrogen and 53,3% oxygen by mass (C = 12, H = 1, O = 16). What is its empirical formula?

1. ACH₄O
2. BC₂HO
3. CCH₂O
4. DCHO