정답이 있는 간호학 입학 시험 대비 화학 학습지

소금물에서 소금을 무엇이라고 하나요?

1. A용질
2. B침전물
3. C용매
4. D촉매

Which method separates sand from water?

1. ADistillation
2. BFiltration
3. CChromatography
4. DEvaporation of the sand

Which is a sign that a chemical reaction may have taken place?

1. AWater freezes into ice when put in a freezer
2. BSugar dissolves completely when stirred into water
3. CA gas is produced when two liquids are mixed
4. DA block of wax melts when it is heated

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

1. A0
2. B−1
3. CIt equals the group number
4. D+1

How many molecules are in 2 mol of carbon dioxide?

1. A6.02 × 10²³
2. B3.01 × 10²³
3. C2.00 × 10²³
4. D1.20 × 10²⁴

Which element has the most metallic character?

1. AAluminium (Al)
2. BCaesium (Cs)
3. CSodium (Na)
4. DChlorine (Cl)

Marble chips react with hydrochloric acid, giving off CO₂. The gas is produced quickly at first, then more and more slowly. Why does the rate fall?

1. AThe activation energy steadily increases as the reaction goes on
2. BThe CO₂ produced turns back into acid
3. CThe products act as a catalyst that slows the reaction down
4. DThe acid concentration falls as it is used up, so collisions become less frequent

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

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