Why the statement all atoms of one element have the same mass is false

Which of the following sentence best describes a buffer? A. Buffer is A substance that resists small change in the acidity of a solution when an acid or base is added to the solution. B.

How many millimeters of cl2 gas must you have to obtain 0.20 g at STP?

Based on the chemical formula of glucose (C6H12O6), select all the true statements. a. The mass percent of carbon and oxygen in glucose is the same. b. In 1 molecule of glucose there are 6 atoms of carbon. T c.

How many neutrons are present in a nucleus whose atomic number is one and whose mass number is one?

Which of the following would not be considered an ionic compound? CuCO3 Ca (OH) 2 co2 Naci

Two clear solutions are placed in separate beakers. The first solution has a pH of 4, and the pH of the second solution is unknown. If the two solutions are mixed and the resulting pH is 5, the second solution must have

Based on its location on the periodic table, which element (s) have properties similar to N? Choose all that apply. * P C O Bi

What conclusion can be drawn from the statement that an element has low electron affinity, low electronegativity, and a low ionization energy?

A scientist performs an experiment in which a radium-226 (Ra-226) atom decays into radon-222 (Rn-222). The scientist concludes that some energy must have been added to the system to cause this reaction to begin.

Which suitable method can be used to separate a mixture of sand and paraffin