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

What is a beta particle?

1. AA wave of visible light
2. BA neutron that leaves the nucleus
3. CA helium nucleus with two protons and two neutrons
4. DA high-energy electron released from a nucleus

Which property is typical of bases?

1. AThey taste sour
2. BThey have a pH below 7
3. CThey feel slippery
4. DThey turn blue litmus red

Which gas is needed for a fuel to burn (combustion)?

1. AHelium
2. BOxygen
3. CCarbon dioxide
4. DNitrogen

In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which species loses electrons?

1. AZn
2. BZn²⁺
3. CCu
4. DCu²⁺

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 leaks through tiny holes in the glass
4. DWater vapour in the air condenses on the cold glass

How does a catalyst speed up a reaction?

1. AIt adds extra reactant to the mixture
2. BIt raises the temperature of the reactants so they move faster
3. CIt makes the reaction more exothermic
4. DIt provides a different pathway with a lower activation energy

In the reaction 2Na + Cl₂ → 2NaCl, which substance is the oxidising agent?

1. ANa⁺
2. BNa
3. CNaCl
4. DCl₂

Un palloncino contiene 2,0 L di gas a 300 K. A pressione costante viene riscaldato a 450 K. Qual è il nuovo volume?

1. A1,3 L
2. B2,0 L
3. C4,5 L
4. D3,0 L