2. An element's atomic number is the A. number of protons in an atom's nucleus. B. mass of the atom. C. weight of the atom. D. sum of the protons and neutrons in an atom.

A 3.50 g sugar cube (sucrose: C12H22O11) is dissolved in a 350 mL teapot containing 80∘ C water (density of water at 80∘ C = 0.975 g/mL). What is the molality of the sugar solution?

Which of the following would shift the following equilibrium system to the right? C2H2 (g) + H2O (g) ⇌ CH3CHO (g) Removing H2O (g) from the system Adding CH3CHO (g) to the system Removing C2H2 (g) from the system Adding H2O (g) to the system

Molecular chlorine and molecular fluorine combine to form a gaseous product. Under the same conditions of temperature and pressure it is found that one volume of cl2 reacts with three volumes of f2 to yield two volumes of the product.

Which of the following is true of an electrolytic cell? a. An electric current causes an otherwise non-spontaneous chemical reaction to occur. b. Reduction occurs at the anode c. A spontaneous electrochemical reaction produces an electric current d.

True or False: a one celled organism is not a living thing

A rigid cylinder with a movable piston contains a 2.0-liter sample of neon gas at STP. What is the volume of this sample when it's temperature is increased to 30 degrees Celsius while its pressure is decreased to 90 kilopascal

Write a speech aimed at year 7 to explain why some metals lose their shine over time but gold does not.

How many moles of co2 could fit in a 475 ml bag at - 22c and 1.125 atm?

How mant atoms are in 3N2

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.