정답이 있는 간호학 입학 시험 대비 화학 학습지

A blown-up balloon is put in a freezer. What happens to its volume?

1. AThe balloon bursts
2. BIt decreases
3. CIt increases
4. DIt stays exactly the same

How many electrons are shared in a double covalent bond?

1. A6
2. B4
3. C8
4. D2

What is plasma, as a state of matter?

1. AA liquid that has been cooled below its freezing point
2. BA solid that conducts electricity
3. CThe liquid part of blood
4. DA very hot gas in which atoms have lost electrons and become ions

Which coefficients balance __Na + __Cl₂ → __NaCl?

1. A1, 1, 1
2. B2, 2, 1
3. C2, 1, 2
4. D1, 2, 1

How does a catalyst speed up a reaction?

1. AIt adds extra reactant to the mixture
2. BIt raises the temperature of the reactants so they move faster
3. CIt makes the reaction more exothermic
4. DIt provides a different pathway with a lower activation energy

A radioactive isotope has a half-life of 5 days. A sample starts with 80 g. How much is left after 10 days?

1. A20 g
2. B40 g
3. C10 g
4. D0 g

Cotton soaked in ammonia (NH₃) and cotton soaked in hydrogen chloride (HCl) are placed at opposite ends of a glass tube. A white ring of ammonium chloride forms closer to the HCl end. What does this show?

1. AThe lighter NH₃ molecules diffuse faster than HCl molecules
2. BBoth gases diffuse at the same speed
3. CThe white ring forms where the gases are heaviest
4. DThe HCl molecules diffuse faster than NH₃ molecules

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