1.쉬움
What is the smallest particle of an element that still has the chemical properties of that element?
- AA proton
- BA nucleus
- CAn atom
- DAn electron
2.쉬움
What is an empirical formula?
- AThe simplest whole-number ratio of atoms in a compound
- BA drawing of how the atoms are bonded
- CThe mass of one mole of a compound
- DThe actual number of each atom in one molecule
3.쉬움
In a chemical reaction, what is the limiting reactant?
- AThe catalyst that controls the speed
- BThe reactant that is left over at the end
- CThe reactant that runs out first and stops the reaction
- DThe reactant with the largest mass
4.보통
얼음물에서 얼음이 녹는 동안 온도는 어떻게 되나요?
- A얼음이 모두 녹을 때까지 0 °C로 유지된다
- B그 시간 내내 꾸준히 오른다
- C곧바로 100 °C까지 오른다
- D0 °C 아래로 떨어진다
5.보통
물의 몰 질량은 얼마인가요? (H = 1 g/mol, O = 16 g/mol)
- A10 g/mol
- B18 g/mol
- C17 g/mol
- D32 g/mol
6.보통
What is the molar mass of sodium chloride, NaCl (Na = 23, Cl = 35.5 g/mol)?
- A81.5 g/mol
- B12.5 g/mol
- C58.5 g/mol
- D23 g/mol
7.어려움
Why does a burn from steam at 100 °C usually cause more damage than one from liquid water at 100 °C?
- ASteam particles are hotter than water particles at the same reading
- BSteam releases a large amount of extra energy as it condenses on the skin
- CLiquid water cannot pass any of its heat to the skin
- DSteam carries dissolved acid that damages the skin
8.어려움
Ethanol (CH₃CH₂OH) and dimethyl ether (CH₃OCH₃) have the same formula, C₂H₆O, but ethanol boils at a much higher temperature. Why?
- AEthanol has an O–H group, so its molecules form hydrogen bonds with each other
- BEthanol has more carbon atoms
- CEthanol molecules are heavier than dimethyl ether molecules
- DDimethyl ether is ionic and ethanol is covalent
정답표
- 1. C · An atom
- 2. A · The simplest whole-number ratio of atoms in a compound
- 3. C · The reactant that runs out first and stops the reaction
- 4. A · 얼음이 모두 녹을 때까지 0 °C로 유지된다
- 5. B · 18 g/mol
- 6. C · 58.5 g/mol
- 7. B · Steam releases a large amount of extra energy as it condenses on the skin
- 8. A · Ethanol has an O–H group, so its molecules form hydrogen bonds with each other
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