Ions are formed when atoms  A) gain or lose electrons          B) gain or lose protons         C) gain or lose neutrons    D) None of these 

A Compound is _____.A)     a pure substance that can be broken down into simpler substances by a chemical change. B)      a substance that is composed of two or more types of matter that can be separated by physical changes.C)      a pure substance that cannot be broken down into simpler substances by chemical changes.D)     a mixture that can be broken down into simpler substances by physical changes.

The wavelength of blue light is 0.000039 m. Express this wavelength in scientific notation. 

Type your answer in the box. All work must be shown for mathematical based problems. For the mathematical problems: Do not round between steps. Round your final answers to 3 significant figures. All answers must have units if needed. Partial credit may be given if work is shown. Some questions will require conversion factors. Please refer to Periodic Table handout. I found some Maydupium (My) lying around, and it contained: 78.99% 24My (23.99 amu), 10.00% 25My (24.99 amu), and 11.01% 26My (25.98 amu). What is the average atomic mass of the Maydupium?

Which of the following is not a physical property?A)     SolubilityB)      State of matterC)      ReactivityD)     Boiling pointE)      Odor

 Which of the following is not part of Dalton’s Atomic Theory? A)     All atoms of a given element have the same mass and other properties that distinguish them from the atoms of other elements. B)      Atoms combine in simple, whole-number ratios to form compounds. C)      Most of the atom’s mass and all of its positive charge is contained in a small core called the nucleus. D)     Each element is composed of tiny indestructible particles called atoms. E)      All of the above are part of the atomic theory. 

Type your answer in the box. All work must be shown for mathematical based problems. For the mathematical problems: Do not round between steps. Round your final answers to 3 significant figures. All answers must have units if needed. Partial credit may be given if work is shown. Some questions will require conversion factors. Please refer to Periodic Table handout. Convert the following7.41 in/min=_____cm/hour

Mass is the force that gravity exerts on an object.

Choose the following Metalloid:A)      Be                   B)  Cr                      C)  Pr                      D) I                          E) None of the above

What is the common charge for an element in group 6A when they react to form a compound with another element?