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

Che cosa mostra un'equazione chimica bilanciata?

1. ALo stesso numero di atomi di ogni tipo da entrambi i lati
2. BPiù prodotti che reagenti
3. CSolo i reagenti della reazione
4. DLo stesso numero di molecole da entrambi i lati della freccia, prima e dopo

Which mixture is a suspension?

1. ASalt dissolved in water
2. BSand stirred into water
3. CSugar dissolved in water
4. DOxygen dissolved in water

What is a cation?

1. AA positively charged ion
2. BA molecule with no charge
3. CA negatively charged ion
4. DA neutral atom

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

1. A+2
2. B−2
3. C0
4. D−1

When two monomers join to form a larger molecule and a water molecule is released, what is the reaction called?

1. ACombustion
2. BCondensation (dehydration synthesis)
3. CNeutralisation
4. DHydrolysis (splitting with water)

Which statement describes a saturated fat?

1. AIt is always liquid at room temperature
2. BIts fatty acid chains have many carbon–carbon double bonds
3. CIts fatty acid chains have no carbon–carbon double bonds
4. DIt contains no carbon atoms

Alpha radiation is stopped by skin, yet an alpha source is very dangerous if swallowed or inhaled. Why?

1. AAlpha particles are only produced at body temperature
2. BStomach acid makes the alpha source more radioactive
3. CAlpha particles turn into much more penetrating gamma rays once inside the body
4. DInside the body, alpha particles deposit all their energy in nearby living cells

At room temperature chlorine (Cl₂) is a gas, bromine (Br₂) is a liquid and iodine (I₂) is a solid. What best explains this trend?

1. AThe covalent bond in I₂ is much stronger than in Cl₂
2. BLarger molecules with more electrons have stronger dispersion forces
3. CIodine forms hydrogen bonds but chlorine does not
4. DChlorine is ionic, while iodine is metallic