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

What is the name of the polyatomic ion NH₄⁺?

1. AAmmonium
2. BNitrate
3. CAmmonia
4. DNitride

What do the letters STP stand for in gas chemistry?

1. AStandard temperature and pressure
2. BSpecific temperature and particles
3. CStandard time and pressure
4. DStable temperature point

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

1. ADeposition
2. BFreezing
3. CCondensation
4. DSublimation

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThere is no effect on the equilibrium
2. BThe equilibrium shifts to the right, toward NH₃
3. CThe NH₃ breaks down completely
4. DThe equilibrium shifts to the left, toward N₂ and H₂

Which reacts more vigorously with water, potassium or sodium?

1. AThey react equally, because both are in group 1
2. BPotassium, because its outer electron is farther from the nucleus
3. CSodium, because its outer electron is farther from the nucleus
4. DSodium, because it has fewer electron shells to shield its electron

Quale proprietà è tipica dei composti ionici come NaCl?

1. ACondurre elettricità allo stato solido secco
2. BBassi punti di fusione ed essere gassosi a temperatura ambiente
3. CAlti punti di fusione; conducono quando sono sciolti
4. DEssere teneri e facilmente piegabili come i metalli

Un elemento ha la disposizione elettronica 2, 8, 7. Quale ione formerà con più probabilità?

1. AUno ione 1+
2. BUno ione 7+
3. CUno ione 2−
4. DUno ione 1−

Water is split as 2H₂O → 2H₂ + O₂. What volume of O₂ at STP (0 °C and 1 atm) forms from 2 mol of water?

1. A22,4 L
2. B44,8 L
3. C67,2 L
4. D11,2 L