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If you have a furnace in your house that burns natural gas to produce heat why is it important for the safety of your family to make sure the furnace is getting an adequate supply of oxygen?  (2 marks)

The softest mineral on Mohs’ hardness scale is ____. 

Geologists believe that 200 to 225 million years ago all the continents were combined into one gigantic supercontinent called:    

In a single displacement reaction to determine if magnesium, Mg, would replace calcium, Ca, in calcium chloride, CaCl2, you would:

Describe (or draw) what the Bohr-Rutherford diagram for an atom of fluorine would look like (what is in the centre and number of electrons in each orbit or energy level).  (2 marks)

Name the following hydrocarbons. In case you can’t see them well, that is a double bond in b) and a triple bond in c).   (3 marks)

The four visible lines of hydrogen’s emission spectrum are a result of:

Explain why an alcohol, such as ethanol, is soluble in water but hydrocarbons such as alkanes are not soluble in water.  (4 marks)         

isotopes are atoms:

Bohr’s model of the atom was the first model that: