What element is used as a shield to protect people from radioactive substances?

Which pair of elements do you expect to be most similar in their chemical properties? a. AgAg and KrKr b. OO and SS c. PbPb and OO d. AlAl and CaCa

At constant volume, you cool a sealed, air-filled can, and the pressure reduces by half. What happens in this situation? The number of collisions per unit area doubles. The spaces between the gas molecules shrink.

The average kinetic energy of gas particles depends on which factor?

Using table 9.4, calculate an approximate enthalpy (in kj) for the reaction of 1.02 g gaseous methanol (ch3oh) in excess molecular oxygen to form gaseous carbon dioxide and gaseous water. (hint, remember to first write the balanced equation.)

8. Which of the given atoms has the smallest atomic radius? Provide an explanation a. Bi b. P C. N d. As

If this fossil is 65 million years old, what could this fossil suggest about organisms alive today? A. If it is similar to any two modern species, it could be a common ancestor of these species. B.

A compound composed of electrically chargerd atoms is called?

If 5.0mL of HC2H30 require 4.96mL of 0.9581 M NaOH to just consume the HC2H302, what is the concentration of the HC2H3O2? If necessary, show the calculation on a separate sheet of paper, scan, and submit with your lab report.

How many formula units of CaSO4 are in 17g of CaSO4?

Which of these would be an appropriate way to describe the concentration of orange candies? Check all that apply the number of orange candies divided by total number of candies the mass of orange candies divided by total mass of candies the volume