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

Which positive ion is found in the highest concentration inside most body cells?

1. ASodium (Na⁺)
2. BCalcium (Ca²⁺)
3. CMagnesium (Mg²⁺)
4. DPotassium (K⁺)

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A32 g/mol
2. B16 g/mol
3. C48 g/mol
4. D8 g/mol

What should a student always wear to protect the eyes when working with chemicals?

1. AReading glasses
2. BContact lenses
3. CSafety goggles
4. DSunglasses

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A25%
2. B75%
3. C5%
4. D133%

How is 0,00045 written in scientific notation?

1. A4,5 × 10⁻⁵
2. B4,5 × 10⁴
3. C4,5 × 10⁻³
4. D4,5 × 10⁻⁴

Che cosa accade alla temperatura dell'acqua con ghiaccio mentre il ghiaccio fonde?

1. ASale subito a 100 °C
2. BScende sotto 0 °C
3. CResta a 0 °C finché tutto il ghiaccio non è fuso
4. DSale costantemente per tutto il tempo

Bilancia l'equazione __C₃H₈ + __O₂ → __CO₂ + __H₂O. Qual è il coefficiente di O₂?

1. A3
2. B5
3. C4
4. D10

Burning a match is strongly exothermic, so why does it not catch fire until it is struck?

1. AStriking pushes extra oxygen into the chemicals of the match head
2. BThe match must first absorb all its energy from the air
3. CStriking makes the reaction endothermic
4. DStriking supplies the activation energy to start the reaction