Two fossils with reptilian characteristics are part of a shipment of fossils sent to a museum. The only difference is that one of the fossils shows evidence that the organism had feathers. Which fossil is probably older and why?

When a consumer purchases a tomato, smell is one of the factors affecting selection. Researchers in Japan have thus analyzed the volatile components of tomatoes using a novel method.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

Are there any vegetarian Italian Sausages?

Explain why iron, cobalt, and nickel are not in the same group of elements

Which of the following is a nonrenewable energy source? A) Nuclear Energy B) Wind Energy C) Hydroelectric Power D) Solar Energy

Suppose that you measure a pen to be 10.5 cm long. Convert this to meters.

How are amounts of hydrogen and oxygen gas made from the electrolytic decomposition of water related to the chemical formula of water?

Hydrogen peroxide decomposes to water and oxygen at constant pressure by the following reaction: 2H2O2 (l) → 2H2O (l) + O2 (g) ΔH = - 196 kJ Calculate the value of q (kJ) in this exothermic reaction when 3.

What is the concentration of hydronium in each of the following cases: [OH-] = 10-12 M? [OH-] = 10-2 M?

Which statement best explains why elements are matter? An element is a physical substance that has mass and takes up space. Elements are pure substances that cannot be divided chemically. Each element is a pure substance composed of one type of atom.