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

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. AVolume and temperature
2. BMass and volume
3. CPressure and volume
4. DPressure and temperature

What is a solution?

1. AA pure compound made of two elements
2. BA mixture that is the same throughout (homogeneous)
3. CA mixture in which particles settle out on standing
4. DA solid that has been melted

Quale gas costituisce la maggior parte dell'aria terrestre?

1. AIdrogeno
2. BOssigeno
3. CAnidride carbonica
4. DAzoto

Qual è la densità di un oggetto con massa 50 g e volume 20 cm³?

1. A1000 g/cm³
2. B70 g/cm³
3. C2,5 g/cm³
4. D0,4 g/cm³

An exothermic reaction is at equilibrium. What happens if the temperature is raised?

1. AThe equilibrium shifts toward the reactants
2. BThe equilibrium does not change
3. CThe equilibrium shifts toward the products, raising the yield
4. DThe reaction becomes endothermic

Quale affermazione descrive un processo endotermico?

1. AAvviene solo a temperature molto alte
2. BAssorbe calore, quindi l'ambiente circostante si raffredda
3. CNon assorbe né libera alcuna energia
4. DLibera calore, quindi l'ambiente circostante si scalda

A student tests whether water temperature affects how fast sugar dissolves. Which set of factors should be kept the same in every trial?

1. AOnly the colour of the cup
2. BThe mass of sugar, the type of sugar, the volume of water and the amount of stirring
3. CThe water temperature and the dissolving time
4. DNothing, because changing several factors at once gives more useful data

Pepsin digests protein in the stomach at about pH 2, but it stops working once food moves into the small intestine, where the pH is higher. Why?

1. AThe change in pH alters the shape of pepsin's active site
2. BPepsin is used up completely in the stomach, just like a reactant
3. CThe small intestine is too cold for any enzyme
4. DPepsin only works on fats in the small intestine