2. Is the hydrogen peroxide and yeast chemical reaction an endothermic or exothermic reaction? Use data and observations
as evidence to support your answer.

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

When the chemicals iron sulfide (fes) and hydrochloric acid (hcl) are combined, bubbles appear from the mixture. 1. does the appearance of bubbles indicate a physical or chemical change? 2. why do the bubbles indicate this change? 3. what property is this?

Match the term to its description match term definition chemical energy a) internal energy caused by vibrations of atoms and molecules electrical energy b) electromagnetic energy that travels in waves radiant energy c) the movement of an electrical charge thermal energy d) potential energy stored in the bonds between atoms