What are complex compounds produced by living organisms called

What amounts to use in sulfur foods?

When water is heated, bubbles form in the water. Is this evidence of a chemical reaction? Why? Question 2 options: No, boiling water is a physical change. Yes, the formation of a gas is evidence of a chemical reaction.

Which of the following is not an example of a compound? A substance comprised of: atoms of the same element atoms of two different elements positive particles of one element attracted to negative particles of a different element positive particles

Bob is investigating whether the density of water changes with temperature. Which of the following variables should he change in his experiment?

When a beaker of water is heated over a Bunsen burner, the volume increases slightly. What is the most likely reason for the small increase in volume? A The water molecules are getting smaller. B The water molecules are getting bigger.

How many valence electrons are in atom of sulfur?

My sister needs this answered! Donald is creating an experiment to determine if fertilizer affects plant color. He makes this statement: "If each plant receives a different amount of fertilizer, then the plant's color intensity will change.

What would happen to life if earth were in a different location within the solar system

Substance that undergoes a change in a chemical reaction is a. a product c. a reactant. b. a chemical. d. an enzyme.

List the number of protons, neutrons, and electrons in Iodine-127. (atomic number is 53)