Question 9 9. The motions of comets ans asteroids in our solar system are
predictable because they are
A. smaller than planets
B. nearly spherical in shape
C. in orbit around the sun
D. controlled by Earth's gravity

Compare and contrast physical changes with chemical changes.

In 1901, thomas edison invented the nickel-iron battery. the following reaction takes place in the battery. fe(s) + 2 nio(oh)(s) + 2 h2o(l) fe(oh)2(s) + 2 ni(oh)2(aq) how many mole of fe(oh)2, is produced when 5.35 mol fe and 7.65 mol nio(oh) react?

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5