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

Which mixture is a suspension?

1. AOxygen dissolved in water
2. BSand stirred into water
3. CSugar dissolved in water
4. DSalt dissolved in water

What are the building blocks (monomers) of proteins?

1. AAmino acids
2. BNucleotides
3. CSimple sugars
4. DFatty acids

What is the change from a gas directly to a solid, skipping the liquid state, called?

1. ADeposition
2. BSublimation
3. CCondensation
4. DFreezing

What is a polymer?

1. AAn ion with more than one charge
2. BA large molecule built from many repeating smaller units called monomers
3. CA mixture of several different elements
4. DA small molecule containing only two atoms of one element

Qual è la carica di uno ione cloruro?

1. A+7
2. B−1
3. C−2
4. D+1

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

1. A6,02 L
2. B1,0 L
3. C22,4 L
4. D273 L

In 2H₂ + O₂ → 2H₂O, 4 g di idrogeno (massa molare 2 g/mol) reagiscono con ossigeno in abbondanza. Quale massa di acqua si forma (massa molare 18 g/mol)?

1. A4 g
2. B18 g
3. C72 g
4. D36 g

What is the percentage by mass of nitrogen in ammonium nitrate, NH₄NO₃ (N = 14, H = 1, O = 16; molar mass 80 g/mol)?

1. A60%
2. B17,5%
3. C35%
4. D28%