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21
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Consider the half reactions below for a chemical reaction.What is the overall equation for this chemical reaction?
A
Upper Z n (s) plus upper C u superscript 2 plus (a q) right arrow upper Z n superscript 2 plus (a q) plus upper C u (s).
B
Upper Z n (s) plus upper C u superscript 2 plus (a q) right arrow upper C u superscript 2 plus (a q) plus upper Z n (s).
C
Upper Z n superscript 2 plus (a q) plus upper C u (s) right arrow upper C u superscript 2 plus (a q) plus upper Z n (s).
D
Upper Z n superscript 2 plus (a q) plus 2 e superscript minus right arrow upper C u superscript 2 plus (a q) plus 2 e superscript plus.
22
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What is the percent by mass of oxygen in carbon dioxide (CO2)?Use .
A
27.29%B
57.12%C
72.71%D
79.99%23
Which reason best explains why metals are shiny?
A
because their valence electrons reflect lightB
because their valence electrons absorb lightC
because their valence electrons oscillate between bandsD
because their valence electrons move to higher energy levels24
Which statement best describes the properties of metals?
A
They are shiny and bend without breaking.B
They are dull and are good electrical insulators.C
They conduct electricity well and are brittle.D
They can be flattened and do not conduct heat well.25
Which is the Lewis structure for H3PO4?
A
mc013-1.jpg
B
A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right.
C
A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
D
A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
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