What is a chemical change? A change in matter from one form to another that doesn't result in a different substance
A gravitational pull that results in a different substance
A reaction or change in a substance that creates more of the same substance
A reaction or change in a substance that results in a different substance

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

How many neutrons does a atom of cobalt have?