7. Justin B. believes that the temperature lowe
causes the color of the leaves to change. He set up an er
ne temperature lowering during the fall months is what
aves to change. He set up an experiment wherein he
placed some plants in 80 degrees rooms and some in 60 deg
es rooms and some in 60 degree rooms. He then
observed the color of the leaves for a total of 1 month. At The
For a total of 1 month. At the end of the month
Justin observed that of the plants in the 60 degree temperature had b
change colors and only 1 of the plants in the 80 degree temperature began to
change color
Independent Variable:
Dependent Variable:

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

може ли да зареждате повече информация, моля

the answer is c.the valence of the atoms combine .