If the universe were contracting what would happen to the light from the other galaxy as it reached earth

a it would dimmer
b it would be brighter
c it would be blue shift
d it would be red shifted

The answer for #3 is c but i don't know why

Asolution of sodium hydroxide was titrated against a solution of sulfuric acid. how many moles of sodium hydroxide would react with 1 mole of sulfuric acid?

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.