정답이 있는 간호학 입학 시험 대비 화학 학습지

What is an acid–base indicator?

1. AA device that measures temperature
2. BA gas given off by acids
3. CA substance that neutralises every acid
4. DA substance that changes colour depending on pH

In a solution, what is the solvent?

1. AThe substance that is dissolved, usually present in the smaller amount
2. BThe substance that does the dissolving, usually present in the larger amount
3. CThe gas given off when a solid dissolves
4. DAny solid that will not dissolve, however long it is stirred

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

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

How many oxygen atoms are in one formula unit of calcium nitrate, Ca(NO₃)₂?

1. A3
2. B2
3. C6
4. D5

Which type of bond holds the two atoms together in a nitrogen molecule, N₂?

1. AA single covalent bond
2. BAn ionic bond
3. CA triple covalent bond
4. DA double covalent bond

What is the oxidation number of an element in its uncombined (elemental) form, such as Fe or O₂?

1. A0
2. BIt equals the group number
3. C−1
4. D+1

Burning a match is strongly exothermic, so why does it not catch fire until it is struck?

1. AStriking makes the reaction endothermic
2. BStriking supplies the activation energy to start the reaction
3. CThe match must first absorb all its energy from the air
4. DStriking pushes extra oxygen into the chemicals of the match head

Olive oil is liquid at room temperature, while butter is solid. Which explanation is correct?

1. AButter contains more water, which freezes at room temperature
2. BOlive oil has no C=C double bonds, so its chains stay straight and pack tightly
3. COlive oil has more C=C double bonds, which kink the chains so they cannot pack closely
4. DOlive oil molecules are ionic, while butter molecules are covalent