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

Which process is exothermic (releases heat)?

1. AEvaporating water
2. BPhotosynthesis
3. CMelting a block of ice
4. DBurning methane gas

Which acid is found in the stomach?

1. ANitric acid
2. BHydrochloric acid
3. CAcetic acid
4. DSulfuric acid

What is the melting point of a substance?

1. AThe temperature at which its liquid turns into a gas
2. BThe temperature at which it dissolves in water
3. CThe temperature at which it catches fire
4. DThe temperature at which its solid turns into a liquid

Quali sono i prodotti della combustione completa di un idrocarburo come il metano?

1. AMonossido di carbonio e idrogeno
2. BOssigeno e acqua
3. CCarbonio e idrogeno gassoso
4. DAnidride carbonica e acqua

Why does stirring help a solid dissolve faster?

1. AIt raises the temperature of the solvent by friction a great deal
2. BIt increases the amount of solute that can dissolve in total
3. CIt brings fresh solvent into contact with the solid's surface
4. DIt turns the solid into a liquid

When a nucleus emits a beta particle, how do its mass number and atomic number change?

1. AMass number stays the same and atomic number rises by 1
2. BBoth fall by 1
3. CMass number falls by 4 and atomic number falls by 2
4. DMass number rises by 1 and atomic number stays the same

Element A has 1 valence electron and element B has 7 valence electrons, both in period 3. Which statement best compares them?

1. AA is a reactive metal and B is a reactive nonmetal
2. BBoth are unreactive because they are in the same period
3. CBoth are metalloids
4. DA is a nonmetal and B is a metal

What is the oxidation number of manganese in potassium permanganate, KMnO₄?

1. A+1
2. B+7
3. C−1
4. D+4