1.쉬움
What kind of carbon–carbon bonds do alkanes contain?
- AAt least one double bond
- BAt least one triple bond
- CIonic bonds
- DOnly single bonds
2.쉬움
What should a student always wear to protect the eyes when working with chemicals?
- AReading glasses
- BSunglasses
- CContact lenses
- DSafety goggles
3.쉬움
What is the SI unit of pressure?
- ANewton (N)
- BPascal (Pa)
- CJoule (J)
- DLitre (L)
4.보통
A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?
- AThe reaction needs a catalyst
- BThe reaction is at equilibrium
- CThe reaction is exothermic
- DThe reaction is endothermic
5.보통
Why must temperatures be in kelvin in gas law calculations?
- ACelsius can only be used for liquids
- BGas volume and pressure are proportional to the absolute temperature
- CThe kelvin scale has smaller degrees, which gives more precise answers
- DKelvin values are always below 100
6.보통
During digestion, large molecules are broken down by adding water across their bonds. What is this reaction called?
- APolymerisation
- BCombustion
- CCondensation
- DHydrolysis
7.어려움
A sealed rigid can holds gas at 2 atm and 27 °C. It is heated to 327 °C. What is the new pressure?
- A4 atm
- B1 atm
- C24 atm
- D2.4 atm
8.어려움
Frying an egg turns the clear egg white solid and white. What happens to the proteins?
- AThey are denatured: their shape changes, but the peptide bonds stay intact
- BThey are hydrolysed, so the peptide bonds break into separate amino acids
- CThey are converted into fats
- DThey are burned to carbon dioxide and water
정답표
- 1. D · Only single bonds
- 2. D · Safety goggles
- 3. B · Pascal (Pa)
- 4. C · The reaction is exothermic
- 5. B · Gas volume and pressure are proportional to the absolute temperature
- 6. D · Hydrolysis
- 7. A · 4 atm
- 8. A · They are denatured: their shape changes, but the peptide bonds stay intact
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