How do you determine the mass number of an atoms

How many centimeters are in 25 kilometers? A. 2.5 x 10 to the power of 6 B. 2.5 x 10 to the power of 4 C. 2.5 x 10 to the power of 3 D. 2.5 x 10 to the power of 5

If 13.0g of CO2 gas has a volume of 0.46L at 310K, what is its pressure in millimeters of mercury?

Identify the solute and solvent in a dilute aqueous solution of potassium chloride

What is the difference between the orbital periods of Mercury and Earth? Select one: a. 0.61 years b. 0.76 years c. 1.24 years d. 1.39 years

Tamara and Tyler are both interested in studying birds. Tamara goes to the park and uses her notebook to record the number and colors of birds that she sees there.

If a net force of 5.0 forward acts on a 0.60 kg toy car, what is it's acceleration?

Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing chromatography sorting

A gas expands in volume from 26.7 to 89.3 mL at constant temperature. Calculate the work done (in joules) if the gas expands (a) against a vacuum, (b) against a constant pressure of 1.5 atm, (c) against a constant pressure of 2.8 atm. (1L⋅atm=101.

Beta particles are emitted from radioactive atom p when it disintegrates spontaneously to form non radioactive atom q. which of these statements is most likely correct about atom p and atom q?

What should I do for the science fair?