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

Perché l'acqua viene spesso chiamata il solvente universale?

1. ANon ha cariche parziali in nessun punto della molecola, quindi si mescola con tutto
2. BScioglie completamente ogni sostanza
3. CÈ l'unico liquido presente sulla Terra
4. DScioglie più sostanze di altri liquidi comuni

What is a molecule?

1. AA single atom with a positive charge
2. BThe nucleus of an atom
3. CTwo or more atoms held together by covalent bonds
4. DA mixture of two different elements

Standard atmospheric pressure (1 atm) is equal to how many millimetres of mercury?

1. A1000 mmHg
2. B100 mmHg
3. C120 mmHg
4. D760 mmHg

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. AVolume
2. BDensity
3. CTotal heat content
4. DMass

What feature makes a hydrocarbon an alkene?

1. AOnly carbon–carbon single bonds
2. BA ring of six carbon atoms with no hydrogen
3. CAt least one carbon–carbon double bond
4. DAn –OH group

What is the oxidation number of oxygen in most of its compounds?

1. A−1
2. B−2
3. C0
4. D+2

Which statement correctly distinguishes a scientific law from a scientific theory?

1. ALaws apply only to chemistry, theories only to biology
2. BA theory becomes a law once it is proved
3. CA law is only a guess, while a theory is a proven fact
4. DA law describes what happens; a theory explains why it happens

J.J. Thomson's cathode ray experiments led to which discovery?

1. AElectrons occupy fixed energy levels
2. BThe nucleus contains uncharged neutrons
3. CAtoms contain small, negatively charged particles
4. DAtoms have a dense, positively charged nucleus