Þ. Some chemical reactions require a substance called a catalyst. The main purpose of a catalyst is a) To warm up the reaction
b) To speed up the reaction
c) To create more reactants
d) To stop the reaction

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

Why is silver chloride is an ionic compound

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude