A solution has a pH of 7. Is it considered a (n)

A) acid

B) base

C) neutral substance

How many pencils are in 20 OWLS

On a test, Helena is defining energy. Which must she include in order to get her answer marked correct? making objects more compact the ability to do work carrying through matter and space the bonds of atoms

How did the germ theory of disease become an accepted idea? The work of three scientists brought about scientific consensus. The work of two scientists brought about scientific consensus.

Mg + 2HCI >MgCI2 + H2 What is the answer of the chemical reaction?

Diffrentiate between fuels and fossil fuels

Calculate the percent yield when 500 grams of carbon dioxide react with an excess of water to produce 640 grams of carbonic acid. CO2 + H2O - --> H2CO3

Which of the following is a possible equivalence that can be used in a conversion? A. ten to the negative second power hL over one L B. ten to the negative second power cL over one L C. ten to the first power L over one daL D.

Which process is a chemical change? burning a match boiling water melting ice breaking glass

What form of matter is "vapor"? a. a solid made of a substance that is usually liquid c. a gas made of a substance that is usually solid b. a liquid made of a substance that is usually gas d. a gas made of a substance that is usually liquid

Which of the following atoms releases more energy than oxygen when an electron is added to its valence energy level? Select one: a. helium (He) b. fluorine (F) c. carbon (C) d. nitrogen (N)