14. Many different gases are found in car exhaust fumes. Some of these gases are produced
by the combustion of petrol in car engines.
The pie chart shows the gases present in the exhaust fumes of a car.
oxygen
+% nitrogen oxides
carbon dioxide
water vapour
carbon
monoxide
55
nitrogen
71%
What evidence in the pie chart shows that incomplete combustion of petrol has

Long term exposure to waves can cause sunburns and skin cancer. a) visible b) infrared c) gamma rays d) ultraviole

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

George is a dalmatian puppy. describe what happens to light that allows you to see george’s black and white coat.