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

What does the rate of a reaction measure?

1. AHow much energy the final products contain
2. BHow quickly reactants are used up or products are formed
3. CHow much product forms in total by the end
4. DHow hot the reaction gets

What is the change from a liquid to a solid called?

1. ACondensation
2. BFreezing
3. CMelting
4. DEvaporation

Which technique is used to separate the different coloured dyes in an ink?

1. AMagnetism
2. BDistillation of the ink
3. CChromatography
4. DFiltration

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

1. ABeta particles (fast electrons)
2. BAlpha particles
3. CX-rays
4. DGamma rays

Which assumption is made about an ideal gas?

1. AIts particles lose energy in every collision
2. BIts particles have no attraction to each other
3. CIts particles stay still at room temperature
4. DIts particles are large, closely packed and strongly attracted

Qual è la disposizione elettronica di un atomo di sodio (11 elettroni)?

1. A8, 2, 1
2. B2, 8, 2
3. C2, 8, 1
4. D2, 9

Each C=O bond in carbon dioxide is polar, yet the CO₂ molecule is nonpolar. Why?

1. ACarbon has lone pairs that cancel the dipoles
2. BThe bonds are ionic, not covalent
3. CThe molecule is linear, so the two bond dipoles cancel out
4. DCarbon and oxygen have the same electronegativity

Starch and cellulose are both made entirely of glucose units, yet humans can digest starch but not cellulose. Why?

1. ACellulose dissolves in water, so it is lost from the gut
2. BThe glucose units are linked differently, and humans lack an enzyme to break cellulose's links
3. CStarch contains nitrogen, which makes it easier to digest
4. DCellulose is really made of amino acids, not glucose, so stomach acid cannot break it