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

What is an empirical formula?

1. AThe mass of one mole of a compound
2. BThe simplest whole-number ratio of atoms in a compound
3. CThe actual number of each atom in one molecule
4. DA drawing of how the atoms are bonded

Nella reazione A + B → AB, che tipo di reazione è rappresentata?

1. ADecomposizione
2. BSintesi (combinazione)
3. CCombustione
4. DScambio semplice

What kind of carbon–carbon bonds do alkanes contain?

1. AOnly single bonds
2. BAt least one double bond
3. CIonic bonds
4. DAt least one triple bond

Quale composto si forma tra calcio (Ca²⁺) e cloro (Cl⁻)?

1. ACa₂Cl₃
2. BCaCl₂
3. CCaCl
4. DCa₂Cl

Which equation shows a combustion reaction?

1. AC₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
2. BCaCO₃ → CaO + CO₂
3. CNaOH + HCl → NaCl + H₂O
4. DZn + CuSO₄ → ZnSO₄ + Cu

Sulfur has 16 electrons. In which period of the periodic table is it?

1. APeriod 2
2. BPeriod 3
3. CPeriod 16
4. DPeriod 6

Methane (CH₄) has four bonding pairs and no lone pairs on carbon. What is its shape?

1. ATrigonal pyramidal
2. BTetrahedral
3. CBent
4. DSquare planar

CO₂ in blood forms carbonic acid: CO₂ + H₂O ⇌ H₂CO₃ ⇌ H⁺ + HCO₃⁻. An anxious patient hyperventilates and breathes off extra CO₂. What happens to blood pH?

1. AIt rises, because less CO₂ means fewer H⁺ ions
2. BIt falls, because oxygen is an acid
3. CIt falls, because less CO₂ means more H⁺ ions
4. DIt stays exactly 7,40, because CO₂ does not affect pH