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

Which form of sugar dissolves fastest in a cup of tea?

1. AGranulated sugar
2. BAll forms dissolve at the same rate
3. CA sugar cube
4. DA large lump of rock sugar

What range does the common pH scale cover?

1. A−7 to +7
2. B1 to 10
3. C0 to 100
4. D0 to 14

What is an alpha particle made of?

1. A2 protons and 2 neutrons
2. BPure electromagnetic energy
3. CA single high-energy electron
4. D1 proton and 1 electron

Drops of water form on the outside of a glass of ice water. Where does this water come from?

1. AThe glass releases water when it gets cold
2. BThe ice evaporates through the glass
3. CWater vapour in the air condenses on the cold glass
4. DWater leaks through tiny holes in the glass

A plastic block has a density of 0,8 g/cm³. What happens when it is placed in water (density 1,0 g/cm³)?

1. AIt dissolves
2. BIt stays suspended halfway down
3. CIt sinks
4. DIt floats

Che tipo di reazione è Zn + 2HCl → ZnCl₂ + H₂?

1. ASintesi
2. BDecomposizione
3. CDoppio scambio
4. DScambio semplice

A salt is dissolved in water in an insulated cup, and the water temperature falls from 25 °C to 20 °C. Which statement is correct?

1. ADissolving is endothermic; the dissolving salt took heat from the water
2. BDissolving is endothermic; the water took heat from the salt
3. CDissolving is exothermic; the dissolving salt released heat into the water
4. DNo energy change occurred, because the temperature fell

Methane burns as CH₄ + 2O₂ → CO₂ + 2H₂O. What mass of CO₂ (44 g/mol) forms from 16 g of CH₄ (16 g/mol)?

1. A88 g
2. B16 g
3. C22 g
4. D44 g