7. Why is the development of a battery system essential for the effective use of wind power?
a. Windmills require batteries to turn them.
Ob. Batteries supply power for transporting
electricity from one place to another.
O c. Batteries store excess power for use when the
wind does not blow.
d. Battery farms use less land than wind farms
commonly do.

Will give brainliest it is a lab from k12 here is the linkfor each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. type your answer here. (score for question 3: of 5 points) were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. type your answer here. (score for question 4: of 5 points) make a general statement about the reactivity of the metals in this experiment. type your answer here.

Compare and contrast physical changes with chemical changes.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3 -> a2cr(no3)3 + a3ag2so4