Where did the Earth's gases first come from?
water
oceans
volcanoes eruptions
rocks
volcanoes
What gases where present in the Earth's early atmosphere? (3 answers)
oxygen
helium
nitrogen
hydrogen
argon
water vapour
Who discovered the positively charged nucleus?
Thompson
Rutherford
The atomic number represents ... (choose 2 answers).
neutrons
electrons
protons
atoms
What common laboratory method is used to determine the unknown concentration of a known reactant?
Titration
Thermal Decomposition
Electrolysis
What is the method used to 'break down' substances using heat?
is the oxide or hydroxide of a metal.
Name the salt corresponding to the type of alkali.
is used to collect gases less dense than air. e.g. hydrogen, oxygen is used to collect gases more dense than air. e.g. chlorine is good for quantitative analysis.
is gain of oxygen is loss of oxygen.
Write some examples of metal extraction methods. Fe2O3 + => 2 + Fe O3 + C => + Al2 CO3 + C=> + Cu
Complete the reactivity series <-----most reactive Platinum <---- least
An is a metal substance made from a mixture of metal elements, and sometimes non-metals.
5 Properties of metals are:
ductility
low melting point
low boiling point
solid at room temperature
high melting point
malleable
high boiling point
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