What is the name for the chemical compound NaBr and is it ionic or covalent

Zinc + lead(ii) nitrate yield zinc nitrate + leadwhat's the chemical equation for this?

What is the temperature of one mole of helium gas at stp?

If we compare and contrast electromagnetic waves with sound waves, all but one statement is true. that is a) sound waves require a medium to travel while electromagnetic waves do not. b) electromagnetic waves can travel through the vacuum of space while sound waves cannot. c) electromagnetic waves must have a medium in which to travel, but sound waves can travel anywhere. eliminate d) sound waves must bounce off of matter in order to travel while electromagnetic waves do not require matter to be present.