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Which of these particles is the smallest? A. an atom B. a nucleus C. a proton D. an electron

One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now, how old will you be when light that is leaving Arcturus today reaches earth?

What can be added to an atom to cause a nonvalence electron in the atom to temporarily become a valence electron? energy mass neutrons electrons

What are elements?

11. If the pH of a solution increases from 2.0 to 4.0, the H3O^ + ion concentration O a decreases by a factor of 2. b. decreases by a factor of 100. c. increases by a factor of 3. O d. increases by a factor of 1000,

Why is it incorrect to balance a chemical equation by changing the subscripts?

Mendeleev's arrangement of elements in the periodic table was based on the observations and experiments of his predecessors who studied mass and properties of elements. True or false?

How many moles do you need to prepare 1.675 L of a 8.50 M NaOH solution? Round your answer to 2 decimal places.

For the following SN1 solvolysis reaction, select the correct rate equation and the overall reaction order (note: CH3OH is the solvent for the reaction). (CH3) 3CCl + CH3OH → (CH3) 3OCH3 + HCl

Which of the following is not a possible sublevel? 1s 2p 3f 4d