1.쉬움
DNA belongs to which group of biological molecules?
- ALipids
- BProteins
- CNucleic acids
- DCarbohydrates
2.쉬움
Which is a sign that a chemical reaction may have taken place?
- ASugar dissolves completely when stirred into water
- BWater freezes into ice when put in a freezer
- CA gas is produced when two liquids are mixed
- DA block of wax melts when it is heated
3.쉬움
Which element has the symbol Fe?
- AFermium
- BFluorine
- CIron
- DFrancium
4.보통
What is the oxidation number of oxygen in most of its compounds?
- A−2
- B0
- C−1
- D+2
5.보통
AgNO₃ + NaCl → AgCl + NaNO₃는 어떤 종류의 반응인가요?
- A단일 치환 반응
- B연소 반응
- C이중 치환 반응
- D분해 반응
6.보통
When diluting a concentrated acid, which method is safe?
- AAdd the water slowly to the acid
- BAdd the acid slowly to the water
- CAdd the water quickly to the acid
- DMix them in any order, as long as it is fast
7.어려움
A solution has a hydroxide ion concentration of 1 × 10⁻³ mol/L. What is its pH at 25 °C?
- A7
- B11
- C14
- D3
8.어려움
물은 작은 분자인데도 끓는점이 유난히 높은 이유는 무엇인가요?
- A분자들 사이의 강한 수소 결합을 끊어야 하기 때문이다
- B이온 화합물이기 때문이다
- C분자가 매우 무겁기 때문이다
- D끓을 때 O–H 결합이 끊어지기 때문이다
정답표
- 1. C · Nucleic acids
- 2. C · A gas is produced when two liquids are mixed
- 3. C · Iron
- 4. A · −2
- 5. C · 이중 치환 반응
- 6. B · Add the acid slowly to the water
- 7. B · 11
- 8. A · 분자들 사이의 강한 수소 결합을 끊어야 하기 때문이다
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