Why isn't the mass of the electron included in the mass of an atom on the periodic table?

Calculate the heat change associated with cooling a 350.0 g aluminum bar from 70.0/C to 25.0/C. Is the change endothermic or exothermic? Why? (-14.2 kJ)

A voltaic cell is set up and a chemical reaction proceeds spontaneously. Which of the following will not occur in this reaction? a. The electrons will migrate through the wire b. The cations in the salt bridge will migrate to the anode half-cell c.

What is hydrocarbon?

What color does red and yellow make?

Through which medium do sound waves travel most slowly?

When does a spring tide take place? At the beginning of spring Only during the spring season Only after spring is over At any time

The highest cloud are known as

What is the mass of 4.85 X 10^22 atoms of iron (Fe) ?

If element x has 95 protons how many electrons does it have

Which of the following when dissolved in deionized water would make a good conducting solution? a) methanolb) sugarc) baking soda