Guys please more help and it is an easy question

I am really stuck so please help.

Firstly, am I right: The metal that reacts the fastest is potassium. The metal that reacts the slowest is lithium.

Secondly, if you leave a piece of silver and a piece of gold in the air for the same length of time, the silver tarnishes quicker than the gold, but slower than copper or iron,. Where should we place silver in our reactivity series.

Finally, does copper react slowly with oxygen or does iron react slowly with oxygen

Yes. In your original question, potassium reacts the fastest and lithium the slowest.

If silver tarnishes faster than gold and slower than copper or iron, you place it below copper and iron and above gold.

Copper reacts slower with oxygen compared to iron.

For your first question, I'll assume that you're refering to the alkaline earth metals, in which case, the answer is no. Francium is the one with the fastest reaction. But if you're refering to reactivity series, nope either, since lithium wouldn't be the slowest.

For your second question, it'll be between copper and gold. If yours doesn't have gold, it'll be right at the bottom :).

Lastly, I have no idea. Sorry, but all I know is that iron reacts slowly with steam to form an oxide, but copper does not.

Anyways, good luck with your chem!

second to the bottom

I'm not comfortable with "speed" as the best descriptor to describe the differences in the reactions of Li and K with water. In water, the reaction with potassium is much more vigorous than with lithium. More energy is released when K and H2O react than when Li and H2O react, and it may very well be possible for that for equal amounts of K and Li, with the same particle size, that K will react more quickly than Li. But you must keep in mind that there is a difference between the kinetics and thermodynamics of a reaction.