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

What does the prefix "milli-" mean?

1. AOne-thousandth (10⁻³)
2. BOne-hundredth (10⁻²)
3. COne thousand (10³)
4. DOne-millionth (10⁻⁶)

What are enzymes?

1. AMinerals that build bone
2. BSugars that store energy in the liver
3. CBiological catalysts, usually proteins
4. DFats that form most of the cell membrane

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AEndothermic
2. BExothermic
3. CA combustion reaction
4. DA neutralisation reaction

Quale proprietà è tipica dei composti ionici come NaCl?

1. AAlti punti di fusione; conducono quando sono sciolti
2. BCondurre elettricità allo stato solido secco
3. CEssere teneri e facilmente piegabili come i metalli
4. DBassi punti di fusione ed essere gassosi a temperatura ambiente

Which substance is a non-electrolyte when dissolved in water?

1. ASodium chloride
2. BPotassium chloride
3. CGlucose
4. DHydrochloric acid

Which halogen is the most reactive?

1. ABromine
2. BIodine
3. CFluorine
4. DChlorine

Why are the radioactive tracers used for medical imaging usually chosen to have short half-lives?

1. AShort half-life isotopes are not radioactive
2. BThey stay active for many years, so a single dose can be used for every future scan
3. CThey emit only alpha particles, which are harmless inside the body
4. DThey give a strong signal for imaging but leave the body's tissues exposed only briefly

How does a rise in temperature affect how much carbon dioxide gas can dissolve in a soft drink?

1. AThe gas turns into a solid at higher temperature
2. BTemperature has no effect on gas solubility
3. CMore gas dissolves, so warm drinks stay fizzy for longer
4. DLess gas dissolves, so warm drinks go flat faster