Give me an easy definition explaining what ions and isotopes are.

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

Given that 1 mi = 1760 yd, determine what conver- sion factor is appropriate to convert 1849 yd to miles; to convert 2.781 mi to yards.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?