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

Which process is exothermic (releases heat)?

1. AEvaporating water
2. BPhotosynthesis
3. CBurning methane gas
4. DMelting a block of ice

Come si chiama una colonna verticale della tavola periodica?

1. AUn gruppo
2. BUna serie
3. CUn periodo
4. DUn guscio

Quale tipo di legame si forma quando gli elettroni sono condivisi tra atomi?

1. AUn legame metallico
2. BUn legame covalente
3. CUn legame nucleare
4. DUn legame ionico

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

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

Which statement describes a saturated fat?

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

How does dissolving salt in water affect the water's boiling point?

1. AIt has no effect on the boiling point
2. BIt raises the boiling point slightly
3. CIt makes the water boil at room temperature
4. DIt lowers the boiling point slightly

What is (8 × 10⁶) ÷ (2 × 10⁻²)?

1. A4 × 10⁻¹²
2. B4 × 10⁸
3. C16 × 10⁴
4. D4 × 10⁴

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. ABoth are unreactive because they are in the same period
2. BA is a nonmetal and B is a metal
3. CBoth are metalloids
4. DA is a reactive metal and B is a reactive nonmetal