Chemical Changes MCQ Test 2 Answers

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1 pt(s).		 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
correct answer choice answer choice you marked 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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1 pt(s).		 Below is a drawing of an oxygen atom. Which of the diagrams could represent a drawing of a molecule of oxygen?
correct answer choice answer choice you marked A.
B.
C.
D.
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1 pt(s).		 Iron is an element. Which of these could be a drawing of two iron atoms?
A.
B.
C.
correct answer choice answer choice you marked D.
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1 pt(s).		 Carbon and zinc are elements. Which of the following could be a drawing of a carbon atom and a zinc atom?
A.
B.
C.
correct answer choice answer choice you marked D.
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1 pt(s).		 When the elements iron and sulphur are joined together a compound forms. This compound is
A. identical to iron
B. identical to sulphur
correct answer choice answer choice you marked C. not like iron or sulphur
D. a mixture of lumps of iron and sulphur
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1 pt(s).		 What is used to test for hydrogen gas?
A. pH paper
B. lime water
correct answer choice answer choice you marked C. a burning splint
D. a glowing splint
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1 pt(s).		 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
correct answer choice answer choice you marked D. Vinegar bubbles when baking soda is added.
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1 pt(s).		 According to this equation, what happened to the carbon and oxygen?
correct answer choice answer choice you marked A. They combined chemically to form a new compound.
B. They combined chemically to form carbon and oxygen.
C. They combined physically to form a new mixture.
D. They combined physically to form a new element.
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1 pt(s).		 Which process is a physical change?
A. Rusting iron
B. Burning coal
C. Tarnishing silver
correct answer choice answer choice you marked D. Melting ice
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1 pt(s).		 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
correct answer choice answer choice you marked C. an element
D. an acid
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1 pt(s).		 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
correct answer choice answer choice you marked D. using a magnet
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1 pt(s).		 Which of these is best classified as a mixture?
A. Carbon dioxide
B. Water
correct answer choice answer choice you marked C. Soil
D. Iron
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1 pt(s).		 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
correct answer choice answer choice you marked D. A physical change
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1 pt(s).		 A substance made up of two or more elements that have been chemically combined is called —
A. an atom
correct answer choice answer choice you marked B. a compound
C. an element
D. a mixture
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1 pt(s).		 In an experiment combining vinegar and baking soda, gas is given off. In this chemical reaction, the vinegar and baking soda are —
correct answer choice answer choice you marked A. reactants
B. products
C. elements
D. suspensions

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