year 8 chemistry quiz

Which is the particle diagram for pure gas?

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Which have the strongest intermolecular forces holding particles in their positions?

• Liquids

• Gases

• solids

All metals are solids at room temerature except...

• Copper

• Aluminium

• Tin

• Mercury

Alloys are a mixture of other metals. Which list are all alloys?

• Iron, Gold, Silver

• Tin, Lead, Copper

• Brass, Bronze, Chrome

• Aluminium, Platinum, Nickel

Which is a list of the properties of copper?

• it is rigid, not flexible and does not conduct electricity

• it dissolves easily in water and is a good insulator

• it is ductile, can be made into wire, and conducts electricity well

• it flows like sand and can be easily squashed

Robert Brown observed particle movement in a random motion. Which diagram shows this?

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Brown had an idea (an hypothesis) that the movement was because the pollen grains were alive. How did he test this hypothesis?

• He "borrowed" research from other scientists which agreed with his ideas.

• He randomly used other things and guessed until he proved he was right.

• He tested something he knew was not alive (stone dust that had been part of the Sphinx), He proved his idea was wrong,

Viscosity is the ability to flow. Some solids can flow but we think of this more as a property of liquids. The more viscous a substance, the more slowly it flows. Which of these statements is false?

• honey is more viscous than lemon juice

• water is more viscous than ketchup

• slime is more viscous than water

Which can be compressed to decrease the volume it takes up?

• solid - e.g.metals

• liquid - e.g. water

• gas - e.g.air

The graph shows the solubility of CO₂ is in different water temperatures. Which of these statements is true.

• The solubility of CO₂ decreases as water temperature increases

• The solubility of CO₂ increases as water temperature increases

• The solubility of CO₂ decreases as water temperature decreases

• The solubility of CO₂ remains the same at all water temperatures