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[tesfaw]

Which of the following make reactions and which do not?

Copper and silver +1
Copper and Hydrogen +1

Iodine and Sodium Chloride
Iodine and Potassium Bromide

[kyle1990]

Refer to the activity series. More reactive metals replace least reactive metals and more reactive halogens replace the less reactive halogens.

The question then becomes:

Is copper more reactive than silver?

Is copper more reactive than hydrogen?

Is iodine more reactive than chlorine?

Is iodine more reactive than bromine?

Again, refer the the activity series to see which substances are more reactive than others. It's a good idea to become familiar with the series so you can predict single-replacement reactions such as these (if any occur)