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

Che cos'è una mole in chimica?

1. ALa massa in grammi di esattamente un atomo di carbonio-12 sulla scala
2. BUna quantità di sostanza che contiene 6,02 × 10²³ particelle
3. CIl numero di protoni in un atomo
4. DIl volume di un litro di qualsiasi gas

Which two substances must be present for iron to rust?

1. AHydrogen and oxygen gas only
2. BOxygen and water
3. CCarbon dioxide and salt
4. DNitrogen and water

Which quantity is the same for 1 mole of any substance?

1. AThe number of atoms per molecule
2. BThe mass in grams
3. CThe number of particles
4. DThe volume as a liquid

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

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

Come si confronta una soluzione con pH 3 con una a pH 5?

1. AHa lo stesso numero di ioni idrogeno
2. BHa 100 volte meno ioni idrogeno
3. CHa 2 volte più ioni idrogeno
4. DHa 100 volte più ioni idrogeno

In the balanced equation __Mg + __HCl → __MgCl₂ + __H₂, what is the coefficient of HCl?

1. A1
2. B4
3. C2
4. D3

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport
2. BIt produces extra oxygen, which damages the lining of the lungs over time
3. CIt produces nitrogen, which replaces oxygen in the blood
4. DIt produces water vapour, which is toxic

In the Bohr model, what happens when an electron drops from a higher energy level to a lower one?

1. AThe electron leaves the atom
2. BEnergy is released, often as light
3. CThe atom gains a proton
4. DEnergy is absorbed from the surroundings