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What kind of carbon–carbon bonds do alkanes contain?

1. AIonic bonds
2. BAt least one double bond
3. CAt least one triple bond
4. DOnly single bonds

Boyle's law describes the relationship between which two properties of a gas, at constant temperature?

1. APressure and temperature
2. BPressure and volume
3. CMass and volume
4. DVolume and temperature

According to the Arrhenius definition, what does a base produce in water?

1. AHydrogen ions (H⁺)
2. BHydroxide ions (OH⁻)
3. CCarbonate ions (CO₃²⁻)
4. DChloride ions (Cl⁻)

Why does keeping food in a refrigerator slow down spoilage?

1. ACold air contains no oxygen
2. BCold temperatures add preservatives to the food
3. CLower temperatures slow down chemical and microbial reactions
4. DLower temperatures raise the activation energy of every reaction

Which substance is a non-electrolyte when dissolved in water?

1. AGlucose
2. BHydrochloric acid
3. CPotassium chloride
4. DSodium chloride

A room is at 25 °C. What is this temperature in kelvin?

1. A298 K
2. B248 K
3. C−248 K
4. D77 K

A salt is dissolved in water in an insulated cup, and the water temperature falls from 25 °C to 20 °C. Which statement is correct?

1. ADissolving is endothermic; the water took heat from the salt
2. BNo energy change occurred, because the temperature fell
3. CDissolving is exothermic; the dissolving salt released heat into the water
4. DDissolving is endothermic; the dissolving salt took heat from the water

What is a triglyceride made of?

1. AOne fatty acid joined to three glycerol molecules
2. BThree glucose molecules joined together
3. COne glycerol molecule joined to three fatty acids
4. DThree amino acids joined by peptide bonds