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

Where are the metalloids found on the periodic table?

1. AIn the two separate rows at the bottom of the table
2. BIn group 18, at the far right edge of the table
3. CAlong the staircase line between the metals and the nonmetals
4. DIn group 1, at the far left edge of the table

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

1. AFreezing
2. BSublimation
3. CEvaporation
4. DCondensation

In a chemical reaction, what is the limiting reactant?

1. AThe reactant that runs out first and stops the reaction
2. BThe catalyst that controls the speed
3. CThe reactant with the largest mass
4. DThe reactant that is left over at the end

Which is larger, a sodium atom (Na) or a sodium ion (Na⁺)?

1. AThey are the same size
2. BIt depends on the temperature
3. CThe sodium ion
4. DThe sodium atom

Which property stays the same whether you have a small sample or a large sample of a pure substance?

1. ATotal heat content
2. BDensity
3. CVolume
4. DMass

What is the shape of a water molecule?

1. AFlat triangle
2. BBent
3. CTetrahedral
4. DLinear

Which of these is a redox reaction?

1. AAgNO₃ + NaCl → AgCl + NaNO₃
2. BZn + CuSO₄ → ZnSO₄ + Cu
3. CNaOH + HCl → NaCl + H₂O
4. DCaCO₃ → CaO + CO₂

Una reazione assorbe 50 kJ di energia dall'ambiente circostante. Quale affermazione è vera?

1. AÈ endotermica e i prodotti hanno più energia dei reagenti
2. BNon c'è stato alcun cambiamento di energia, perché l'energia si conserva
3. CÈ endotermica e i prodotti hanno meno energia dei reagenti
4. DÈ esotermica e i prodotti hanno meno energia dei reagenti