A flask contains oxygen, carbon dioxide,

and nitrogen gases. The partial pressures

of each are 11.4 atm, 5.6 atm, and 8.7

atm, respectively.

What is the total pressure in the flask in

atm?

Solid objects have no mass in space

Which statement explains the most realistic way to model energy flow in an ecosystem? A. A food chain is most realistic because many organisms eat one type of food, and energy moves through a single pathway. B.

Which of the labeled structures breaks down food molecules to make ATP? the centrioles the nucleus the mitochondria the Golgi bodies

How many electrons can be described by the quantum numbers n = 7, l = 1?

Of the following, when can a compound be treated like an element when balancing chemical equations? A. When there is no change to the atoms in the compound. B. When the compound is made of anions. C. When the compound is made of cations. D.

What are some chemacial changes in your school?

Which of the following is an example of a double-replacement reaction? A. 3K + AlCl3à 3KCl + Al B. KOH + HBr à KBr + H2O C. CH4 + 2O2à CO2 + 2H2O D. Cu + 2H2SO4à CuSO4 + SO2 + 2H2O

Distinguish between thermal cracking and catalytic cracking

At the end of the reaction you washed the chemicals into a beaker using water. Why was it OK to use water to do this if Grignard reagents are very reactive towards water?

What happens when the electron moves from the first energy level to the second energy level? Energy is absorbed, and an emission line is produced. Energy is released, and an emission line is produced. Energy is absorbed by the atom.