Susana heats up a sample of red crystals. While the sample is being heated, a gas is released and a blue powder is left after heating. Is the sample of red crystals an element or compound?

Which of the following provides support and protection for many insects a) muscle b) skeleton c) spinal cord d) exoskeleton

Which of the following is true about the products formed during photosynthesis? (5 points) select one: a. they have the same mass as the mass of reactants. b. they are the same set of compounds as the reactants. c. they have more mass than the mass of reactants. d. they are chemically the same as the reactants.

Imagine you are a business executive who wants to pursue an environment policy for your company that limits pollution and uses fewer raw materials but would cost more what might be the discussion to your next broad meeting how would you make your case to your shareholders