Chemical Reactions 2 – Science Revision

1. 1 pts.	In a class, a student accidentally poured sulphur into a jar of iron filings. She decided it would be easiest to separate the two using a magnet. This method would work because
	A.	The elements have formed a compound and so are not joined to each other
	B.	The elements have formed a mixture and so are joined to each other
	C.	The elerments have formed a mixture and so are not joined to each other
	D.	The elements have formed a compound and are joined to each other
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2.
1 pts.

Below is a drawing of an oxygen atom. Which of the diagrams could represent a drawing of a molecule of oxygen?

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3.
1 pts.

Iron is an element. Which of these could be a drawing of two iron atoms?

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4.
1 pts.

Carbon and zinc are elements. Which of the following could be a drawing of a carbon atom and a zinc atom?

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5. 1 pts.	When the elements iron and sulphur are joined together a compound forms. This compound is
	A.	identical to iron
	B.	identical to sulphur
	C.	not like iron or sulphur
	D.	a mixture of lumps of iron and sulphur
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6. 1 pts.	What is used to test for hydrogen gas?
	A.	pH paper
	B.	lime water
	C.	a burning splint
	D.	a glowing splint
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7. 1 pts.	Which of these is a chemical reaction?
	A.	A lake freezes solid.
	B.	Gravel, sand, and water are mixed
	C.	A copper bar is rolled into a flat sheet
	D.	Vinegar bubbles when baking soda is added.
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8.
1 pts.

According to this equation, what happened to the carbon and oxygen?

They combined chemically to form a new compound.

They combined chemically to form carbon and oxygen.

They combined physically to form a new mixture.

They combined physically to form a new element.

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9. 1 pts.	Which process is a physical change?
	A.	Rusting iron
	B.	Burning coal
	C.	Tarnishing silver
	D.	Melting ice
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10. 1 pts.	Because zinc can combine with other substances but cannot be changed into a simpler substance by an ordinary chemical process, zinc is classified as —
	A.	a compound
	B.	a mixture
	C.	an element
	D.	an acid
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11. 1 pts.	A mixture of iron filings and sulphur can easily be separated by —
	A.	placing the mixture in water
	B.	performing a chemical reaction
	C.	heating the mixture
	D.	using a magnet
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12. 1 pts.	Which of these is best classified as a mixture?
	A.	Carbon dioxide
	B.	Water
	C.	Soil
	D.	Iron
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13. 1 pts.	If you break a piece of glass, the shape of the glass changes, but the properties in the fragments remain the same. Which of the following has occurred?
	A.	A chemical change
	B.	A temperature change
	C.	A state change
	D.	A physical change
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14. 1 pts.	A substance made up of two or more elements that have been chemically combined is called —
	A.	an atom
	B.	a compound
	C.	an element
	D.	a mixture
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15. 1 pts.	In an experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are —
	A.	reactants
	B.	products
	C.	elements
	D.	suspensions
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