Describe the different abiotic and biotic parts of an ecosystem. Identify and explain what organisms lie on each of the trophic levels.

To form an oxygen molecule to oxygen atoms share two pairs of electrons what kind of bond is shown below by the electron dot diagram of o2

What is a ionic compound made up of?

If a pure substance consists of hydrogen and oxygen and a mixture consists of hydrogen and oxygen: both the pure substance and the mixture will be identical the pure substance will still keep the properties of both the hydrogen and the oxygen the

Which of the following is NOT a property of acids? A) Acids turn litmus paper red. B) Acids dissolve many metals. C) Acids have a sour taste. D) Acids have a slippery feel. E) All of the above are properties of acids.

Each of the compounds that you tests contained chlorine, which is a poisonous gas. Why was this test safe to perform (it was, or your lungs would have turned to mush) without a gas mask?

Which of the following compounds, when added to water, is most likely to increase the solubility of HgS? A. KNO3 B. Na2SO4 C. KCl

Evidence that best supports the theory of biological evolution was obtained from the

You may normally expect a slow reaction if a low activation energy is required.

What do 2 different neutral isotopes of the same element have in common?

Why are oceans salty