#1: a concentration in terms of volume/volume is used to describe which of the following types of solutions?

a. solutions with a solid solvent and a solid solute

b. solutions with a liquid solvent and a liquid solute

c. solutions with a solid solute and a liquid solute

d. solutions with a liquid solvent and a solid solute

**i'm not really sure on this one : ( what do you think?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)

Acandle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. the wick is usually surrounded by wax. which is the most important property of covalent compounds that makes them useful for making candle wax? a low boiling point a low melting point a high boiling point a high melting point