An atom has a mass number of 25 and 13 neutrons. what is the atomic number of this atom? express your answer as an integer.

A student analyzed an unknown sample that contained a single anion. The sample gave a yellow precipitated upon addition of a solution of AgNo3 which did not dissolve in ammonia.

Which of the following elements are not main-group elements? Check all that apply. Pb Mo Cs Br Al

Which is not a characteristic of chemical equilibrium

At 325 k, the pressure inside a gas-filled container is 467 kpa. If the pressure inside decreases to 233 kpa, but the volume remains the same, what is the final temperature of the gas?

11. what is the volume of 80.0 g of ether if the density of ether is 0.70 g/ml? a) 5.6 x 10^1 ml b) 1.1 x 10^2 ml c) 8.8 x 10^-3 ml d) 8.0 x 10^1 ml

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