What is the salt produced when sulfuric acid (h2so4) reacts with potassium hydroxide (koh)?

a)so4k
b)k2so4
c)kso4
d)h2o

When balancing a chemical equation:

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

What was bohr’s contribution to the planetary model