All elements in a period have the same energy level due to which of the following reasons?

a. the same atomic number

b. the same number of neutrons

c. the same number of electrons

d. the same number of electron shells

1. Why does putting baking soda on a fire put it out? A. The baking soda cools the fire off so it can't burn. B. CO2 gas is produced reducing the amount of heat. C. The fuel is covered and not available to the fire. D.

Calculate the mass percent of phosphorus in a strand of DNA that consists of equal amounts of each of the four N-bases.

The reaction CO2 (g) → C (s) + O2 (g) is a decomposition reaction. True False

Definition of isometry.

a gas has a pressure of 1.5 atm, and occupies a volume of 16 L. what will be the new pressure if the volume decreases to 10 L

Which type of bond forms between water molecules? a. strong bond b. hydrogen bond c. covalent bond d. polar bond

Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syndrome? a) ID physical characteristics of someone with the disease.

Which expression is a measurement of denisty

Compare the information provided by a molecules chemical formula to the information provided by its structural formula

How is a circle different from an ellipse