Chemistry Year 10

Where did the Earth's gases first come from?

What gases where present in the Earth's early atmosphere? (3 answers)

Who discovered the positively charged nucleus?

The atomic number represents ... (choose 2 answers).

What common laboratory method is used to determine the unknown concentration of a known reactant?

What is the method used to 'break down' substances using heat?

[blank_start]A base[blank_end] is the oxide or hydroxide of a metal.

Name the salt corresponding to the type of alkali.

[blank_start]Upward delivery[blank_end] is used to collect gases less dense than air. e.g. hydrogen, oxygen [blank_start]Downward delivery[blank_end] is used to collect gases more dense than air. e.g. chlorine [blank_start]Syringe collection[blank_end] is good for quantitative analysis.

[blank_start]Oxidation[blank_end] is gain of oxygen [blank_start]Reduction[blank_end] is loss of oxygen.

Write some examples of metal extraction methods. Fe2O3 + [blank_start]C[blank_end] => [blank_start]CO[blank_end]2 + Fe [blank_start]Al2[blank_end]O3 + C => [blank_start]CO2[blank_end] + Al2 [blank_start]Cu[blank_end]CO3 + C=> [blank_start]CO3[blank_end] + Cu

Complete the reactivity series [blank_start]Potassium[blank_end] <-----most reactive [blank_start]Sodium[blank_end] [blank_start]Lithium[blank_end] [blank_start]Calcium[blank_end] [blank_start]Magnesium[blank_end] [blank_start]Iron[blank_end] [blank_start]Zinc[blank_end] [blank_start]Tin[blank_end] [blank_start]Lead[blank_end] [blank_start]Copper[blank_end] [blank_start]Silver[blank_end] [blank_start]Gold[blank_end] Platinum <---- least [blank_start]reactive[blank_end]

An [blank_start]alloy[blank_end] is a metal substance made from a mixture of metal elements, and sometimes non-metals.

5 Properties of metals are: