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

How many moles of oxygen atoms are in 1 mole of carbon dioxide, CO₂?

1. A1
2. B2
3. C0,5
4. D3

Come sono disposti gli elementi nella tavola periodica moderna?

1. AIn ordine crescente di numero di neutroni
2. BIn ordine alfabetico dei simboli
3. CIn ordine crescente di numero atomico
4. DIn base alla data di scoperta

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ASublimation
2. BDeposition
3. CCondensation
4. DFreezing

Which substance is a non-electrolyte when dissolved in water?

1. APotassium chloride
2. BSodium chloride
3. CHydrochloric acid
4. DGlucose

When a nucleus emits an alpha particle, how do its mass number and atomic number change?

1. AMass number falls by 2 and atomic number falls by 4
2. BMass number stays the same and atomic number rises by 1
3. CNeither changes
4. DMass number falls by 4 and atomic number falls by 2

A gas mixture contains nitrogen at 600 mmHg, oxygen at 150 mmHg and other gases at 10 mmHg. What is the total pressure?

1. A253 mmHg
2. B760 mmHg
3. C750 mmHg
4. D600 mmHg

Why does a sodium ion (Na⁺) have almost the same mass as a sodium atom?

1. AIons and atoms always have exactly the same mass
2. BThe only difference is one electron, which has a tiny mass
3. CThe ion has one fewer proton, which has a tiny mass
4. DThe ion gains a neutron that balances the loss

Sulfuric acid reacts with sodium hydroxide: H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O. How many moles of NaOH neutralise 0,5 mol of H₂SO₄?

1. A0,5 mol
2. B0,25 mol
3. C2 mol
4. D1 mol