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

Which positive ion is found in the highest concentration inside most body cells?

1. ASodium (Na⁺)
2. BPotassium (K⁺)
3. CMagnesium (Mg²⁺)
4. DCalcium (Ca²⁺)

What is the melting point of a substance?

1. AThe temperature at which it catches fire
2. BThe temperature at which it dissolves in water
3. CThe temperature at which its solid turns into a liquid
4. DThe temperature at which its liquid turns into a gas

For a given substance, in which state do its particles move fastest?

1. AThey move at the same speed in all states
2. BGas
3. CLiquid
4. DSolid

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A2, 2, 1
2. B2, 1, 2
3. C1, 2, 1
4. D1, 1, 1

In a reaction at equilibrium, a product is continuously removed. What happens?

1. AMore product keeps forming as the equilibrium shifts to the right
2. BThe reaction rate drops to zero
3. CThe reactants run out immediately
4. DThe equilibrium shifts to the left to form more reactants

Which equation shows a combustion reaction?

1. AC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
2. BNaOH + HCl → NaCl + H₂O
3. CCaCO₃ → CaO + CO₂
4. DZn + CuSO₄ → ZnSO₄ + Cu

At the top of a high mountain, air still contains about 21% oxygen. Why do climbers still get less oxygen with each breath?

1. AThe total air pressure is lower, so the partial pressure of oxygen is lower
2. BThe percentage of oxygen in the air falls sharply as you climb higher
3. COxygen is heavier, so it all sinks to sea level
4. DCold air contains no oxygen

Uranium-238 (atomic number 92) undergoes alpha decay. Which nucleus is formed?

1. AThorium-234 (atomic number 90)
2. BProtactinium-234 (atomic number 91)
3. CPlutonium-242 (atomic number 94)
4. DThorium-238 (atomic number 90)