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

What is plasma, as a state of matter?

1. AThe liquid part of blood
2. BA solid that conducts electricity
3. CA very hot gas in which atoms have lost electrons and become ions
4. DA liquid that has been cooled below its freezing point

What is the change from a liquid to a solid called?

1. AFreezing
2. BEvaporation
3. CMelting
4. DCondensation

What is a hydrocarbon?

1. AA carbon atom with a positive charge
2. BA compound made of hydrogen and oxygen
3. CA compound made of only hydrogen and carbon
4. DAny compound that dissolves in water

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A3
2. B5
3. C6
4. D2

Which reacts more vigorously with water, potassium or sodium?

1. APotassium, because its outer electron is farther from the nucleus
2. BSodium, because its outer electron is farther from the nucleus
3. CSodium, because it has fewer electron shells to shield its electron
4. DThey react equally, because both are in group 1

Which element has the most metallic character?

1. ASodium (Na)
2. BAluminium (Al)
3. CCaesium (Cs)
4. DChlorine (Cl)

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

Zinc reacts as Zn + 2HCl → ZnCl₂ + H₂. What mass of zinc (65 g/mol) reacts completely with 50 mL of 2 M HCl?

1. A3,25 g
2. B65 g
3. C1,63 g
4. D6,5 g