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

DNA belongs to which group of biological molecules?

1. AProteins
2. BLipids
3. CNucleic acids
4. DCarbohydrates

Which state of matter has a fixed volume but takes the shape of its container?

1. ALiquid
2. BPlasma
3. CSolid
4. DGas

Which of these is a polyatomic ion?

1. ASulfate, SO₄²⁻
2. BSodium, Na⁺
3. CChloride, Cl⁻
4. DOxide, O²⁻

Quante moli ci sono in 88 g di anidride carbonica (massa molare 44 g/mol)?

1. A44 mol
2. B3872 mol
3. C0,5 mol
4. D2 mol

For the gas reaction N₂ + 3H₂ ⇌ 2NH₃, what is the effect of increasing the pressure?

1. AThe NH₃ breaks down completely
2. BThe equilibrium shifts to the right, toward NH₃
3. CThe equilibrium shifts to the left, toward N₂ and H₂
4. DThere is no effect on the equilibrium

What are London dispersion forces?

1. AForces that hold protons together in the nucleus
2. BStrong bonds formed by transferring electrons
3. CWeak, temporary attractions caused by shifting electrons in molecules
4. DAttractions between a hydrogen atom and a metal ion

A mixture contains sand, salt and water. Which sequence separates all three?

1. AUse a magnet to remove the salt, then filter the sand
2. BFilter to remove the sand, then distil the filtrate to collect water and leave salt
3. CEvaporate all the water first, then filter the salt away from the dry sand
4. DDistil first to remove the sand, then filter out the salt

A solution of a strong acid has pH 2. It is diluted with water to 10 times its original volume. What is the new pH?

1. A0,2
2. B20
3. C1
4. D3