100 points! plzz - chemistry
question 1 options:
potassium forms ions with a ch...
100 points! plzz - chemistry
question 1 options:
potassium forms ions with a charge of +1 (k+). iodine forms ions with a charge of -1. selenium forms ions with a charge of -2 (
imagine that potassium ions and selenide ions combine to form potassium selenide. what numbers would be in the place of x and y in:
kxsey
(use the number 1 even if it isn't strictly necessary)
x=
y =
you are balancing an ionic compound. let's call it: ab.
ion a has a charge of +2 and ion b has a charge of -3.
therefore, you determine that the ionic compound (ab) will have a ratio of 3 as for every 2 bs.
how would you modify ab in order to show that they have this 3-to-2 ratio?
question 2 options:
a3b2
a3b2
3a2b
calcium forms ions with a charge of +2. iodine forms ions with a charge of -1.
which of the following would represent an ionic compound composed of calcium and iodide ions?
question 3 options:
cai2
cai
ca2i
ca2i
2cai
cai2
question 4 (1 point)
balance the following chemical reaction (or 'equation'):
ca + cl --> cacl2
question 4 options:
ca + cl2 --> cacl2
ca + 2cl --> cacl2
ca + cl --> cacl
question 5 (1 point)
when you are balancing chemical reactions ('equations'), what must you never touch?
question 5 options:
the normal-looking numbers to the left of the molecules or compounds.
the coefficients
the numbers in subscript
question 6 (1 point)
question 6 options:
balance the following reaction:
a2b + dc3 --> ac + d2b3
hint: don't do this in your head. use a piece of paper and a pencil.
when this reaction is balanced, what number must be to the left of ac?
(use numerals such as 1, 2, or 3; not words such as one, two, or three)
question 7 (1 point)
which of the following would represent a single displacement reaction between potassium bromide (k+br-) and iodine (i), which forms iodide (
question 7 options:
kbr + i -> ki + br
kbr + i -> k + ibr
kbr + i -> kbr + i
question 8 (1 point)
a single displacement reaction is
question 8 options:
when two couples are dancing on the floor and they each swap partners. now both men are dancing with a new woman.
when a couple is dancing on the floor and a single man comes up and asks to dance with the woman. then the woman starts dancing with a new partner and the original man is all alone.
question 9 (1 point)
a double displacement reaction is
question 9 options:
when two couples are dancing on the floor and they each swap partners. now both men are dancing with a new woman.
when a couple is dancing on the floor and a single man comes up and asks to dance with the woman. then the woman starts dancing with a new partner and the original man is all alone.
question 10 (1 point)
which represents the double displacement reaction between sodium chloride (nacl) and silver nitrate (agno3)?
charges: na+, cl-, ag+, (no3)-
question 10 options:
nacl + ag(no3) --> ag(no3) + nacl
nacl + ag(no3) --> na(no3) + agcl
nacl + ag(no3) --> cl(no3) + agna
question 11 (1 point)
which is the balanced single displacement reaction between aluminum (al3+) and copper sulfate (cu2+(so4)2-)
question 11 options:
al2 + cu(so4)3 --> cu + al2(so4)3
al + cu(so4) --> cu + al2(so4)3
2al + 3cu(so4) --> 3cu + al2(so4)3
al + cu(so4) --> cu + al(so4)
question 12 (1 point)
which represents the balanced double displacement reaction between sodium chloride (na+cl-) and copper sulfate (cu2+(so4)2-) ?
question 12 options:
nacl + cu(so4) --> na2(so4) + cucl2
2nacl + cu(so4) --> na2(so4) + cucl2
nacl + cu(so4) --> cl(so4) + nacu
nacl + cu(so4) --> na(so4) + cucl
Answers: 1
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