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

Which electrons take part in chemical bonding?

1. AAll electrons take part equally
2. BThe electrons closest to the nucleus
3. COnly the electrons in the first shell
4. DThe valence (outermost) electrons

Che cosa fa un catalizzatore?

1. ARallenta una reazione e si consuma
2. BFornisce i reagenti per una reazione
3. CCambia i prodotti di una reazione
4. DAccelera una reazione senza consumarsi

Which functional group is found in all alcohols?

1. AAmino group (–NH₂)
2. BCarboxyl group (–COOH)
3. CHydroxyl group (–OH)
4. DCarbonyl group (C=O) only

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

What is nuclear fission?

1. AThe burning of uranium in oxygen
2. BThe loss of electrons from an atom
3. CThe joining of two light nuclei to form a heavier nucleus
4. DThe splitting of a heavy nucleus into smaller nuclei

In the ideal gas law, PV = nRT, what does n stand for?

1. AThe number of atoms per molecule
2. BThe density of the gas
3. CThe number of molecules of gas
4. DThe number of moles of gas

A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?

1. A24 atm
2. B2,4 atm
3. C4 atm
4. D1 atm

In the reaction NH₃ + H₂O ⇌ NH₄⁺ + OH⁻, which substance acts as the Brønsted–Lowry acid?

1. ANH₃
2. BOH⁻
3. CH₂O
4. DNH₄⁺ only