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

How is percent yield calculated?

1. A(Mass of reactants ÷ mass of products) × 100
2. BActual yield − theoretical yield
3. C(Theoretical yield ÷ actual yield) × 100
4. D(Actual yield ÷ theoretical yield) × 100

Quale gas costituisce la maggior parte dell'aria terrestre?

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

An instant cold pack feels cold when the substance inside dissolves. How is this dissolving process classified?

1. AA combustion reaction
2. BExothermic
3. CEndothermic
4. DA neutralisation reaction

Which type of radiation can be stopped by a sheet of paper?

1. AX-rays
2. BAlpha particles
3. CBeta particles (fast electrons)
4. DGamma rays

How does a mixture of iron filings and sulfur powder differ from the compound iron sulfide?

1. AThe mixture is formed by a chemical reaction between the two elements
2. BThe compound keeps the magnetic properties of iron
3. CThe mixture can be separated physically, for example with a magnet
4. DThe mixture has a fixed ratio of iron to sulfur

What are isomers?

1. ACompounds with the same structure but different molecular formulas
2. BCompounds with the same molecular formula but different structures
3. CAtoms of the same element with different numbers of neutrons
4. DMolecules that contain the same number of bonds

A nurse wipes a patient's arm with an alcohol swab and the patient says the skin feels cold. What explains this?

1. AThe alcohol blocks the skin's nerve endings for warmth
2. BThe alcohol is stored at a much lower temperature than the room
3. CThe alcohol absorbs heat from the skin as it evaporates
4. DThe alcohol reacts with the skin in an endothermic chemical reaction

Under which conditions does a real gas behave least like an ideal gas?

1. AHigh pressure and low temperature
2. BLow pressure and low volume of particles
3. CHigh temperature and large container
4. DLow pressure and high temperature