During a solar flare, it is most likely that

24-karat gold is considered to be pure gold. 18-karat gold is considered to be about 75% gold. What is 18-karat gold considered a mixture rather than a pure substance?

A 100.0 ml sample of 0.10 m ca (oh) 2 is titrated with 0.10 m hbr. determine the ph of the solution after the addition of 400.0 ml hbr. the chemical equation is below. ca (oh) 2 (aq) + 2hbr (aq) → cabr2 (aq) + h20 (l)

The volume of a given quantity of a gas must increase if:

In the combined gas law, if the volume is decreased, what happens to the temperature if pressure remains constant? a. The temperature decreases. b. The temperature increases. c. The temperature remains the same.

At STP, what is the volume of 1.0 mole of carbon dioxide?

Which statement is the best description of a chemical bond? A. A chemical bond connects 2 different molecules. B. A chemical bond holds atoms together. c. A chemical bond turns molecules into atoms. D. A chemical bond identifies atoms in a molecule.

Is the atom indicated with an arrow nucleophilic, electrophilic, acidic, more than one of these choices, or none of these choices? (For purposes of this question, acidic is defined as pKa ≤ 25.) Select all that apply.

Na and Mg ions each have ten electrons surrounding their nuclei. which ion would you expect to have the larger radius? Explain your answer

A bowl of trail mix and a bowl of soup are examples of what type of matter? 9 (a) solution (b) heterogeneous mixture (c) element (d) compound

What's difference between "formula unit" and "molecule"?