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

Quale elemento ha il simbolo K?

1. APotassio
2. BCarbonio
3. CCalcio
4. DKripton

What does the rule "like dissolves like" mean?

1. AEvery substance dissolves in water
2. BPolar solvents dissolve polar substances, and nonpolar solvents dissolve nonpolar ones
3. CSolids dissolve only in other solids
4. DOnly substances with identical formulas can ever dissolve in each other

What is the smallest particle of an element that still has the chemical properties of that element?

1. AA proton
2. BAn atom
3. CA nucleus
4. DAn electron

What is the normal boiling point of a liquid?

1. AThe temperature at which its particles stop moving
2. BThe temperature at which it first starts to evaporate
3. CThe temperature at which its density is greatest
4. DThe temperature at which its vapour pressure equals 1 atmosphere

Che cosa sono i legami a idrogeno?

1. ALegami all'interno del nucleo dell'idrogeno
2. BLegami ionici tra ioni idrogeno e metalli
3. CLegami covalenti tra due atomi di idrogeno in H₂
4. DAttrazioni tra un idrogeno di una molecola e un atomo di O, N o F di un'altra

How does atomic radius change going down a group?

1. AIt decreases, then increases
2. BIt increases
3. CIt decreases
4. DIt stays the same

Un metallo reagisce con un acido e si sviluppa un gas che brucia con un piccolo scoppio. Di quale gas si tratta?

1. AOssigeno
2. BIdrogeno
3. CAzoto
4. DAnidride carbonica

Gently heating DNA separates its two strands, but each strand stays in one piece. Why?

1. AThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
2. BEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
3. CThe two strands are joined by ionic bonds that melt first
4. DHeat converts DNA into a protein