1. how many negative ones (-1) would you need to balance out one positive 2 (+2)?

question options:

two negative ones balance out two positive twos

one negative one balances out one positive two

two negative ones balance out one positive two

one negative one balances out two positive twos

2. potassium forms ions with a charge of +1 (ka+). 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 =

3. 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 options:

3a2b

a3b2

a3b2

4. 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 options:

cai2

cai

ca2i

ca2i

2cai

cai2