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

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

1. ACondensation
2. BSublimation
3. CFreezing
4. DEvaporation

Quale particella ha una massa quasi trascurabile rispetto alle altre in un atomo?

1. AL'elettrone
2. BIl neutrone
3. CIl nucleo nel suo insieme
4. DIl protone

What is an empirical formula?

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

Which reacts more vigorously with water, potassium or sodium?

1. ASodium, because it has fewer electron shells to shield its electron
2. BPotassium, because its outer electron is farther from the nucleus
3. CSodium, because its outer electron is farther from the nucleus
4. DThey react equally, because both are in group 1

What is the name of the compound CaCO₃?

1. ACalcium oxide
2. BCalcium carbonate
3. CCarbon calcium trioxide
4. DCalcium carbide

Magnesium forms Mg²⁺ ions and oxygen forms O²⁻ ions. What is the formula of magnesium oxide?

1. AMgO₂
2. BMgO
3. CMg₂O₂
4. DMg₂O

Hydrogen is usually placed at the top of group 1. Which statement about hydrogen is correct?

1. AIt is an alkali metal that is solid at room temperature
2. BIt always forms H⁺ ions and never shares electrons
3. CIt has a full outer shell like the noble gases
4. DIt has one valence electron like group 1 metals, but it is a nonmetal gas

Orange bromine water is shaken with two hydrocarbons. With hexene it turns colourless; with hexane it stays orange. What does this show?

1. AHexene contains a C=C double bond; hexane does not
2. BBoth contain double bonds, but hexane reacts more slowly
3. CHexane contains a C=C double bond; hexene does not
4. DHexene is an alcohol and hexane is an acid