Which scenario describes a physical change?
The bright blue color of a concentrated copper (II) sulfate solution fades as it is diluted by the

addition of water.

When a solid copper penny and a solution of nitric acid are mixed, a reddish-orange gas is
produced.

When hydrochloric acid is poured over white pellets of sodium hydroxide, the pellets dissolve,
and the solution is warm to the touch.

When two clear solutions of lead (1) acetate and potassium iodide are mixed in a test tube, a
bright yellow precipitate forms. a

Which of the following terms describe a liquid molecule that has only single bonds between its carbon atoms

Which of the following conclusions can be drawn

In german cockroaches, curved wing (cv) is recessive to normal wing (cv+). bill, who is raising cockroaches in his dorm room, finds that the frequency of the gene for curved wings in his cockroach population is 0.6. in his friend joe’s apartment, the frequency of the gene for curved wings is 0.2. one day joe visits bill in his dorm room, and several cockroaches jump out of joe’s hair and join the population in bill’s room. bill estimates that, now, 10% of the cockroaches in his dorm room are individual roaches that jumped out of joe’s hair. what is the new frequency of curved wings among cockroaches in bill’s room? 0.69 0.4 0.5 0.31 0.20