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

According to the kinetic molecular theory, how do gas particles move?

1. ASlowly in fixed positions
2. BConstantly, randomly and in straight lines between collisions
3. CAlways in a single direction, set by the pull of gravity
4. DOnly when heated, and then in neat lines between the walls

Qual è il simbolo chimico del sodio?

1. ASo
2. BS
3. CNa
4. DN

What is an alloy?

1. AA nonmetal that conducts electricity
2. BA compound formed when a metal reacts with oxygen
3. CA pure metal in its natural state
4. DA mixture of a metal with one or more other elements

Water can act as an acid in some reactions and as a base in others. What is such a substance called?

1. AIsotonic
2. BSaturated
3. CNeutral
4. DAmphoteric

A red blood cell is placed in a concentrated (hypertonic) salt solution. What happens?

1. AThe cell stays the same size and shape
2. BWater enters the cell, which swells and may burst
3. CWater leaves the cell, which shrinks
4. DSalt leaves the cell, which swells

At STP (0 °C and 1 atm), what volume does 1 mole of an ideal gas occupy?

1. A1,0 L
2. B273 L
3. C6,02 L
4. D22,4 L

Marble chips react with hydrochloric acid, giving off CO₂. The gas is produced quickly at first, then more and more slowly. Why does the rate fall?

1. AThe products act as a catalyst that slows the reaction down
2. BThe acid concentration falls as it is used up, so collisions become less frequent
3. CThe CO₂ produced turns back into acid
4. DThe activation energy steadily increases as the reaction goes on

Perché l'acqua ha un punto di ebollizione insolitamente alto per una molecola così piccola?

1. AI suoi legami O–H si rompono quando bolle
2. BÈ un composto ionico
3. CSi devono rompere i forti legami a idrogeno tra le sue molecole
4. DLe sue molecole sono molto pesanti