An atom of sodium has 11 protons, 11 electrons, and 12 neutrons, what is its atomic number and mass number?

How many moles of carbon are in 7.87x10' carbon atoms?

Why different fuels are used in different vehicles?

Elements in the same group on the periodic table have the same number of electrons number of protons number of neutrons number of valence electrons

What happens to water when dry ice is added?

How many molecules are there in 0.250 moles of oxygen?

The word atom means invisible?

A pycnometer weighs 25.60 g empty and 35.55 g when filled with water at 20°C. The density of water at 20°C is 0.9982 g/ml. When 10.20 g lead is placed in the pycnometer and the pycnometer is again filled with water at 20°C, the total mass is 44.83 g.

How does weathering affect the surface area of a rock? Explain your answer.

How would each of the following procedural errors affect the results to be expected in this experiment? Give your reasoning in each case. (A) Not all of the liquid was vaporized when the flask was removed from the water bath.

What volume of 2.00 m must be added to 150.0 ml of 1.00 m chloroacetic acid to produce a buffer solution having a ph of 3.30?