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

Which element is a metalloid?

1. ASulfur
2. BArgon
3. CSilicon
4. DSodium

At sea level, at what temperature does pure water freeze?

1. A−32 °C (−26 °F)
2. B100 °C (212 °F)
3. C32 °C (90 °F)
4. D0 °C (32 °F)

What does the double arrow (⇌) in a chemical equation show?

1. AThe reaction releases heat
2. BThe reaction is reversible
3. CThe reaction needs a catalyst
4. DThe reaction is very fast

How does evaporation differ from boiling?

1. AEvaporation produces a solid, while boiling produces a gas
2. BEvaporation needs a higher temperature than boiling
3. CEvaporation happens only at the surface and at any temperature; boiling happens throughout the liquid at a set temperature
4. DEvaporation happens throughout the liquid at a set temperature; boiling happens only at the surface

Qual è la formula dell'ossido di alluminio, formato da ioni Al³⁺ e O²⁻?

1. AAlO
2. BAl₂O₃
3. CAlO₃
4. DAl₃O₂

What is carbon-14 dating used for?

1. AEstimating the age of material that was once alive
2. BDetecting carbon monoxide in a room
3. CMeasuring body temperature
4. DFinding the exact age of rocks that are billions of years old

For N₂ + 3H₂ → 2NH₃, 1 mol of N₂ is mixed with 2 mol of H₂. Which reactant is limiting?

1. AN₂, because there is less of it
2. BNeither, because both are used up exactly
3. CH₂, because 1 mol of N₂ would need 3 mol of H₂
4. DNH₃, because it is the product

In 2H₂ + O₂ → 2H₂O, 4 g di idrogeno (massa molare 2 g/mol) reagiscono con ossigeno in abbondanza. Quale massa di acqua si forma (massa molare 18 g/mol)?

1. A72 g
2. B18 g
3. C36 g
4. D4 g