A student added 5 grams of calcium chloride, a white solid substance, to 15 grams of water at 220 C. Several observations were made and the student inferred that a chemical reaction occurred. Which observation best supports the student's inference that a chemical reaction occurred?

A. The calcium chloride dissolved in the solution.
B. The mass of the solution totals 20 grams.
C. The temperature of the solution is 350 C.
D. The solution became lighter in color

Explanation:

ur backkk thanks again Jon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r + 2bhe has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

Jon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4bJon and Lexi are playing a marble game. According to their rules, 6 points are awarded for each red marble collected and 2 points are awarded for each blue marble collected. Which expression represents Jon's total score if he has r red marbles and b blue marbles?

Group of answer choices

6r − 2b

6r + 2b

8rb

6r − 4b

well, they made a movie about how animals lived there.

rotten tomato score 95%

note: mark other user brainliest.!

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.