Review for EST-1

What is the element symbol for aluminium?

• Al

• Am

• AL

• AM

What will happen when water freezes?

• They gain energy and move further apart.

• They lose energy and move further appart

• They lose energy and get closer to each other

• They gain energy and get closer to each other

What apparatus must be used to separate sand from a mixture of sand-water?

• 
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• 
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Magnesium iodide has 1 magnesium atom and 2 iodine atoms. What is the best chemical formula to represent this compound?

• MgIn2

• Mg₂I

• MgI

• MgI₂

Which statement about isotopes is incorrect?

• Isotopes have the same number of protons

• Isotopes have different physical properties

• Isotopes have different number of neutrons

• Isotopes have different chemical properties

What is the relative atomic mass of Ge.

• 72.89

• 73.0

• 74

• 75

Which process does not represent a chemical change?

• Baking a cake

• Respiration

• Photosynthesis

• Melting

Which gas diffuse faster?

• Propane (Relative Molecular Mass = 44)

• Ethane (Relative Molecular Mass = 30)

What is the chemical formula of magnesium sulfide?

• Mg₂S₂

• Mg₂S

• MgS

• MgS₂

What is the chemical formula of aluminium chloride?

• AlC_l2

• AlCl

• Al₃Cl

• AlCl₃