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

What does the subscript 2 in H₂O tell you?

1. AThere are two water molecules
2. BEach molecule contains two hydrogen atoms
3. CEach molecule contains two oxygen atoms
4. DWater has a charge of 2

What causes the pressure of a gas in a container?

1. AGas particles colliding with the container walls
2. BGas particles sticking to the walls
3. CThe weight of the container pressing on the gas inside
4. DGas particles stopping and pushing outward

What does organic chemistry study?

1. AOnly compounds found in plants
2. BCompounds made of metals
3. CCompounds based on carbon
4. DOnly the noble gases

Which gas forms when hydrochloric acid reacts with calcium carbonate?

1. ACarbon dioxide
2. BOxygen
3. CChlorine
4. DHydrogen

What does Avogadro's law state?

1. AThe pressure of a gas doubles when its temperature is halved
2. BEqual volumes of gases at the same temperature and pressure contain equal numbers of molecules
3. CEqual masses of all gases contain equal numbers of molecules under any conditions
4. DOne mole of any gas has a mass of 22,4 g

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

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

A mixture contains sand, salt and water. Which sequence separates all three?

1. AUse a magnet to remove the salt, then filter the sand
2. BEvaporate all the water first, then filter the salt away from the dry sand
3. CFilter to remove the sand, then distil the filtrate to collect water and leave salt
4. DDistil first to remove the sand, then filter out the salt

In the reaction NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq), which ions are spectator ions?

1. AAg⁺ and Cl⁻
2. BNa⁺ and Cl⁻
3. CAg⁺ and NO₃⁻
4. DNa⁺ and NO₃⁻