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