How many neutrons are in an atom with the atomic number of 15 and an atomic mass number of 34?

? 19

? 15

? 34

Which corresponds to the composition of the ion typically formed by magnesium?

How do people use selective breeding to change a species?

A gas occupies 4.31 liters at a pressure of 101.325 kPa. Determine the new volume at 80.8 kPa.

The best fit curve line to an absorbance vs. concentration plot for standard solutions of a dye has a slope of 0.1815 mL/mg and intercept of 0.0477. A sample solution prepared of the same dye has an absorbance of 0.

Which of the following is an example of a double replacement reaction? (a) 3Fe + 2O2 Fe3O4 (b) BaCl2 + K2CO3 BaCO3 + 2KCl (c) NiCO3 NiO + CO2 (d) Cl2 + 2NaBr 2NaCl + Br2

According to the ph scale, what is the approximate ph of acid rain? a. 4.0 b. 4.5 c. 5.0 d. 5.5

You find a little bit (0.150g) of a chemical marked Tri-Nitro-Toluene, and upon combusting it in oxygen, collect 0.204 g of CO2 and 0.030 g H2O (we'll assume that these are the products, along with nitrogen).

What reaction occurs when two amino acids are put together?

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains of water at. During the reaction of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath.

An aluminum can has a height of 4.83 inches, a diameter of 2.60 inches, and a uniform wall/end thickness of 0.0112 inches.