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

What are the units of molarity?

1. AMoles of solute per kilogram of the solvent used
2. BGrams of solute per 100 g of solution
3. CGrams of solute per litre of solution (g/L)
4. DMoles of solute per litre of solution (mol/L)

What is an unsaturated solution?

1. AA solution with undissolved solid at the bottom
2. BA solution with no solute at all
3. CA solution that holds the maximum possible solute
4. DA solution that can still dissolve more solute

What is the SI base unit of mass?

1. APound
2. BNewton
3. CKilogram
4. DGram

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction needs a catalyst
2. BThe reaction is endothermic
3. CThe reaction is at equilibrium
4. DThe reaction is exothermic

How can you get solid salt back from salt water?

1. AUse a magnet
2. BFilter the solution
3. CFreeze the solution and lift out the salt
4. DEvaporate the water

The amino acid glycine has an –NH₂ group and a –COOH group. What are these two groups called?

1. AA phosphate group and a hydroxyl group
2. BAn amino group and a carboxyl group
3. CA carbonyl group and an ester group
4. DA hydroxyl group and a methyl group

Si mescolano 2 mol di H₂ e 2 mol di O₂ che reagiscono come 2H₂ + O₂ → 2H₂O. Quale reagente è limitante?

1. ANessuno dei due, perché le quantità sono uguali
2. BL'acqua, perché è il prodotto
3. CL'idrogeno, perché 2 mol di H₂ usano solo 1 mol di O₂
4. DL'ossigeno, perché ce n'è meno dell'idrogeno

A solution of a strong acid has pH 2. It is diluted with water to 10 times its original volume. What is the new pH?

1. A1
2. B0,2
3. C3
4. D20