Year 9 (2)

Isotopes have

• same nucleon number

• different electrons

• different protons

• different neutrons

Electrolysis of molten PbBr₂ produces

• Lead at the positive electrode

• Hydrogen at the negative electrode

• Bromine at the positive electrode

In both states the particles are touching

• Solids and gases

• liquids and gases

• solids and liquids

Which diagram represents burette

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Substance X melts at -210 ^oC and boils at - 150 ^oC

• X is solid at -230 ^oC

• X is liquid at -140 ^oC

• X is gas at -300 ^oC

Which one of these substances, C, D, E or F, conducts electricity when solid?

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Which one of these substances, C, D, E or F, is soluble in water?

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Which one of these substances, C, D, E or F, is a gas at room temperature?

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Which two of these structures are covalently bonded?

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Which one of these structures is a diatomic molecule?

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