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

Apart from mercury, which element is a liquid at room temperature?

1. AIodine
2. BChlorine
3. CSodium
4. DBromine

Quale tipo di legame si forma quando gli elettroni sono condivisi tra atomi?

1. AUn legame covalente
2. BUn legame ionico
3. CUn legame metallico
4. DUn legame nucleare

In a chemical reaction, what is the limiting reactant?

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

Which statement describes a saturated fat?

1. AIts fatty acid chains have no carbon–carbon double bonds
2. BIts fatty acid chains have many carbon–carbon double bonds
3. CIt contains no carbon atoms
4. DIt is always liquid at room temperature

A reaction has a theoretical yield of 20 g, but only 15 g of product is collected. What is the percent yield?

1. A75%
2. B133%
3. C25%
4. D5%

Which assumption is made about an ideal gas?

1. AIts particles are large, closely packed and strongly attracted
2. BIts particles lose energy in every collision
3. CIts particles stay still at room temperature
4. DIts particles have no attraction to each other

10 g di una sostanza si sciolgono in acqua formando 250 mL di soluzione. Qual è la sua concentrazione in g/L?

1. A25 g/L
2. B0,04 g/L
3. C40 g/L
4. D2,5 g/L

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. A3
2. B20
3. C1
4. D0,2