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

What is an acid–base indicator?

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

In a chemical equation, what are the reactants?

1. AThe new substances formed, written to the right of the arrow
2. BThe numbers written in front of each formula
3. CThe starting substances, written to the left of the arrow
4. DThe catalysts written above the arrow

What colour does blue litmus paper turn in an acid?

1. ARed
2. BGreen
3. CPurple
4. DBlue (no change)

What is the name of the molecular compound CO?

1. ACarbon dioxide
2. BMonocarbon oxide
3. CCarbon oxide
4. DCarbon monoxide

Quali sono i prodotti della combustione completa di un idrocarburo come il metano?

1. AAnidride carbonica e acqua
2. BMonossido di carbonio e idrogeno
3. CCarbonio e idrogeno gassoso
4. DOssigeno e acqua

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

1. AAl₃O₂
2. BAlO
3. CAlO₃
4. DAl₂O₃

Half-normal saline (0,45% NaCl) is compared with blood plasma, which has about the same concentration as 0,9% NaCl. How is 0,45% NaCl described, and what happens to red blood cells placed in it?

1. AHypertonic; salt moves into the cells, which then swell
2. BHypotonic; water tends to move into the cells, which swell
3. CHypertonic; water tends to move out of the cells, which shrink
4. DIsotonic; water moves equally in and out, so the cells keep their shape

Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?

1. A88 g
2. B22 g
3. C44 g
4. D16 g