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KengaRu [80]
3 years ago
8

How do I solve question 18

Chemistry
2 answers:
Anni [7]3 years ago
6 0
To solve number 18 you have to add the positive and negative to equal zero. For example for 18a it would be K2S ( the 2 is a subscript ) because you need 2 positives to cancel out the 2 negatives. 
castortr0y [4]3 years ago
4 0
18. You can cross over the + - number on the top to each other or make them = 0.
<span>a. K2S ........K+ => K 2 from S2.... S2- => S
b. CaO........ 
c. Na2O
d. AIN

19. 
</span><span>a. BaCl2 
b. MgO
c. Li2O
d. CaF2

20. 
</span><span>b. Li, Cl 

d. I, Na</span>
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