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What colour does blue litmus paper turn in an acid?

1. APurple
2. BBlue (no change)
3. CRed
4. DGreen

According to the Arrhenius definition, what does an acid produce in water?

1. ASodium ions (Na⁺)
2. BHydroxide ions (OH⁻)
3. COxide ions (O²⁻)
4. DHydrogen ions (H⁺)

In a solution, what is the solvent?

1. AThe substance that is dissolved, usually present in the smaller amount
2. BAny solid that will not dissolve, however long it is stirred
3. CThe gas given off when a solid dissolves
4. DThe substance that does the dissolving, usually present in the larger amount

What is the name of the molecular compound CO?

1. ACarbon dioxide
2. BCarbon oxide
3. CMonocarbon oxide
4. DCarbon monoxide

Which measurement has three significant figures?

1. A56
2. B0,00560
3. C0,0056
4. D5,0006

What are London dispersion forces?

1. AForces that hold protons together in the nucleus
2. BAttractions between a hydrogen atom and a metal ion
3. CStrong bonds formed by transferring electrons
4. DWeak, temporary attractions caused by shifting electrons in molecules

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

A compound is a gas at room temperature, does not conduct electricity in any state, and is made of two nonmetals. What kind of substance is it most likely?

1. AA metal with delocalised electrons
2. BA giant covalent network solid
3. CA simple molecular (covalent) substance
4. DAn ionic compound (a lattice of ions)