1.やさしい
What is the smallest particle of an element that still has the chemical properties of that element?
- AA nucleus
- BAn atom
- CA proton
- DAn electron
2.やさしい
Which gas is needed for a fuel to burn (combustion)?
- ACarbon dioxide
- BNitrogen
- CHelium
- DOxygen
3.やさしい
ある原子は、陽子 6 個、中性子 6 個、電子 6 個をもつ。質量数はいくつか。
- A0
- B6
- C12
- D18
4.ふつう
0.5 mol of KCl is dissolved to make 250 mL of solution. What is its molarity?
- A125 M
- B0.125 M
- C0.5 M
- D2 M
5.ふつう
What is the name of the compound CaCO₃?
- ACalcium oxide
- BCalcium carbide
- CCarbon calcium trioxide
- DCalcium carbonate
6.ふつう
Water has a high specific heat capacity. How does this help the human body?
- AIt makes water a poor solvent for salts
- BIt makes the blood more acidic
- CIt allows oxygen to dissolve in water more easily
- DIt helps keep body temperature stable
7.むずかしい
Gently heating DNA separates its two strands, but each strand stays in one piece. Why?
- AEach strand is held together by hydrogen bonds, while the two strands are joined by covalent bonds
- BHeat converts DNA into a protein
- CThe strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
- DThe two strands are joined by ionic bonds that melt first
8.むずかしい
正しく釣り合っている反応式はどれか。
- A2Na + Cl₂ → 2NaCl
- BNa + Cl → NaCl₂
- CNa + Cl₂ → NaCl
- D2Na + Cl₂ → NaCl₂
解答
- 1. B · An atom
- 2. D · Oxygen
- 3. C · 12
- 4. D · 2 M
- 5. D · Calcium carbonate
- 6. D · It helps keep body temperature stable
- 7. C · The strands are held together by weak hydrogen bonds, while each strand's backbone is covalent
- 8. A · 2Na + Cl₂ → 2NaCl
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