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1.Carbon dioxide is-------------- a)Element b)Compound c)Mixture
b)Compound
2. Copper is shiny and good electric conductors so it is---------------- a)Metal b) Non-metal c)Semi-metal
a)Metal
3. All gases are considered----------------------- a) Metal b)Non-metal c)Semi-metal
b)Non-metal
A type of matter formed of one type of atoms is: a)Element. b)Compound. c)Neutrons.
a)Element.
Ahmed has a piece of element, he does not know if it is a metal or non-metal. Suggest how he can decide if it is a metal or non-metal.
He should check its properties, if it is shiny, good heat conductor and good electric conductor, then it is a metal. If not so it is non-metal
What is the best material to be used for making cooking pans? Justify.
Metals because they are good heat conductors.
a) Water is------------------- (Element – compound)
compound
b) Water molecule is made up of ---------------- atoms. (2 – 3 – 4)
3
c) If one more oxygen atom is added to the molecule------------------ (Water keeps the same properties - Water changes its properties)
Water changes its properties
