Which of the following isotopes is most useful for dating plant and animal remains?

A. potassium - 40

B. Uranium - 238

C. Carbon-14

D. Lead-212

The temperature in Kelvin of 2.0 dm3 of an ideal gas is doubled and its pressure is increased by a factor of four. What is the final volume of the gas

Consider the cells of a plant. Discuss at least two chemical processes that occur due to the various functions carried out by different plant cells.

What is the entropy change for freezing 2.71 g of C2H5OH at 158.7 K? ∆H = - 4600 J/mol. Answer in units of J/K.

Why are enzymes known as biocatalysts?

The salt sodium sulfate, Na2SO4, can be formed by a reaction between ... a. NaOH and HCL. b. NaCl and H2O. c. NaOH and H2SO4. d. NaCl and NH3.

Potassium chlorate (used in fireworks, flares, and safety matches) forms oxygen and potassium chloride when heated. KClO3 (s) → KCl (s) + O2 (g) [unbalanced] What mass of oxygen gas is formed if 26.4 g of potassium chlorate decomposes completely?

Explain the iodine clock reaction.

1 75 ml of lemon juice are added to 50 ml of water. What is the percent by vo of the solute?

How many moles of tungsten atoms are in 4.8 x 1025 atoms of tungsten?

At what speeds do you criuse down the track of a roller coaster