Describe the physical and chemical changes that take place during digestion

What does the law of convservation of matter show?

Which of the molecules are polar? A) CH3F B) NH3 C) HF D) H2O E) CH4 F) BeCl2

At STP, which 4.0-gram zinc sample will react fastest with dilute hydrochloric acid? (1) lump (3) powdered (2) bar (4) sheet metal

What happens to electrons during an oxidation reduction reaction

The forces between water molecules are stronger than the forces between ethanol molecules. Which liquid would probably be most difficult for an insect to walk on? Explain your answer.

What is the PH of a solution whose [H+] is 0.0007

What was concluded about the structure of the atom as the result of the gold foil experiment? (1) A positively charged nucleus is surrounded by positively charged particles. (2) A positively charged nucleus is surrounded by mostly empty space.

Andre is predicting the products of chemical reactions. In one reaction, a hydrocarbon is the only reactant. What is the best prediction and explanation of this reaction? Two new compounds form as the hydrocarbon undergoes a synthesis reaction.

What evidence is there that electrons move around in definite pathways around the nucleus? What evidence is there that electrons m

Are greenhouse gases good for us?