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

What is the molar mass of oxygen gas, O₂ (O = 16 g/mol)?

1. A8 g/mol
2. B32 g/mol
3. C16 g/mol
4. D48 g/mol

What is an acid–base indicator?

1. AA gas given off by acids
2. BA device that measures temperature
3. CA substance that changes colour depending on pH
4. DA substance that neutralises every acid

What is an unsaturated solution?

1. AA solution with undissolved solid at the bottom
2. BA solution that holds the maximum possible solute
3. CA solution that can still dissolve more solute
4. DA solution with no solute at all

In the balanced equation __Mg + __HCl → __MgCl₂ + __H₂, what is the coefficient of HCl?

1. A1
2. B3
3. C4
4. D2

Why does keeping food in a refrigerator slow down spoilage?

1. ALower temperatures raise the activation energy of every reaction
2. BCold temperatures add preservatives to the food
3. CCold air contains no oxygen
4. DLower temperatures slow down chemical and microbial reactions

Which statement describes a saturated fat?

1. AIts fatty acid chains have many carbon–carbon double bonds
2. BIts fatty acid chains have no carbon–carbon double bonds
3. CIt is always liquid at room temperature
4. DIt contains no carbon atoms

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

Due isotopi dello stesso elemento differiscono per quale proprietà?

1. ALe reazioni chimiche a cui partecipano
2. BIl numero di elettroni nell'atomo neutro
3. CIl numero atomico
4. DIl numero di massa