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

Where are the metalloids found on the periodic table?

1. AIn group 1, at the far left edge of the table
2. BIn group 18, at the far right edge of the table
3. CAlong the staircase line between the metals and the nonmetals
4. DIn the two separate rows at the bottom of the table

Which property is typical of bases?

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

Which technique is used to separate the different coloured dyes in an ink?

1. ADistillation of the ink
2. BMagnetism
3. CChromatography
4. DFiltration

How many molecules are in 2 mol of carbon dioxide?

1. A2,00 × 10²³
2. B3,01 × 10²³
3. C6,02 × 10²³
4. D1,20 × 10²⁴

What is nuclear fission?

1. AThe loss of electrons from an atom
2. BThe burning of uranium in oxygen
3. CThe joining of two light nuclei to form a heavier nucleus
4. DThe splitting of a heavy nucleus into smaller nuclei

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

1. A1
2. B2
3. C3
4. D4

Hyperbaric oxygen therapy places a patient in a chamber with oxygen at higher than normal pressure. Why does this raise the oxygen dissolved in blood plasma?

1. AHigher pressure makes red blood cells divide faster
2. BHigher pressure turns the oxygen into a liquid
3. CHigher pressure lowers body temperature, so the blood can hold much more gas
4. DGas solubility in a liquid increases with the partial pressure of the gas

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AOlive oil has more C=C double bonds, which kink the chains so they cannot pack closely
2. BOlive oil has no C=C double bonds, so its chains stay straight and pack tightly
3. CButter contains more water, which freezes at room temperature
4. DOlive oil molecules are ionic, while butter molecules are covalent