How much work must be done on a 1,000-kg car to increase its speed from 1 m/s to 2 m/s?
a. 1,000 j
b. 2,000 j
c. 1,500 j
d. 1 j

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

The element that has the greatest electronegativity is

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.)