You are a scientist working on increasing the efficiency of appliances to waste less electricity. You are running experiments measuring the input, output, and waste energy from 3 light bulbs. Given the data below, determine which model has the lowest percentage of energy lost as waste. Lightbulb 1: 200 joules in, 50 joules wasted, 150 joules out Lightbulb 2: 100 joules in, 30 joules wasted, 70 joules out Lightbulb 3: 150 joules in, 100 joules wasted, 50 joules out

How many neutrons does a atom of cobalt have?

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)