Calculate the atomic mass for zinc given the following data for its natural isotopes:

64Zn 63.929 amu 48.89 %

66Zn 65.926 amu 27.81 %

67Zn 66.927 amu 4.11 %

68Zn 67.925 amu 18.57 %

70Zn 69.925 amu 0.62 %

What challenges does fishing pose to biodiversity? What do you think should be done and why?

A chemical is placed in a beaker containing 20 g of soil and 500 mL of water. At equilibrium, the chemical is found in the soil ast a concentration of 100 mg. kg-1 of soil.

Anything with mass creates gravity, but the amount of gravity is proportional to the amount of mass. Question 3 options: True False

Identify objects that are good conductors of heat. (Choose all that apply.) A. Dirt B. Metal C. Paper D. Water

A 4.236 g sample of a hydrocarbon is combusted to give 3.810 g of h2o and 13.96 g of co2. what is the empirical formula of the compound?

What should I do for the science fair?

Which compounds yield hydrogen ions as the only positive ions in an aqueous solution? (1) H2CO3 and HC2H3O2 (2) H2CO3 and NaHCO3 (3) NH3 and HC2H3O2 (4) NH3 and NaHCO3

4. How does the kinetic theory of gases explain the weather changes happening in the troposphere? You can also research on the Internet using keywords such as troposphere, atmospheric layers, and weather changes.

Is the earth older than any of they rock layers

What will be the charge of sulfur