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

Quale sostanza è una base?

1. AAceto (acido acetico)
2. BSucco di limone (acido citrico)
3. CAcido cloridrico (HCl)
4. DIdrossido di sodio (NaOH)

Which quantity is the same for 1 mole of any substance?

1. AThe number of particles
2. BThe number of atoms per molecule
3. CThe mass in grams
4. DThe volume as a liquid

Which three elements make up carbohydrates?

1. ACarbon, hydrogen and oxygen
2. BHydrogen, nitrogen and phosphorus
3. CCarbon, nitrogen and sulfur
4. DCarbon, hydrogen and nitrogen

Sulfur has 16 electrons. In which period of the periodic table is it?

1. APeriod 3
2. BPeriod 16
3. CPeriod 2
4. DPeriod 6

Si diluiscono 100 mL di una soluzione 2 M fino a un volume totale di 400 mL. Qual è la nuova concentrazione?

1. A1 M
2. B0,5 M
3. C2 M
4. D8 M

How does a catalyst speed up a reaction?

1. AIt raises the temperature of the reactants so they move faster
2. BIt adds extra reactant to the mixture
3. CIt provides a different pathway with a lower activation energy
4. DIt makes the reaction more exothermic

Which phase change absorbs energy from the surroundings (is endothermic)?

1. ASublimation
2. BCondensation
3. CFreezing
4. DDeposition

Na⁺, Mg²⁺, F⁻ and O²⁻ all have 10 electrons. Which ion is the largest?

1. ANa⁺
2. BF⁻
3. CMg²⁺
4. DO²⁻