692.04 u 1.22m 3.468 g work each of the following problems, observing significant figure rules: three determinations were made of the percentage of oxygen in mer results were 7.40%, 7.43%, and 7.35%. what was the average percentay the percentage of oxygen in mercuric oxide. the a rectangular solid measures 13.4 cm x 11.0 cm x 2.2 cm. calculate solid. 4 cm x 11.0 cm x 2.2 cm. calculate the volume of the ercury is 13.6 g/ml, what is the mass in grams of 3426 ml of the liquid? a copper cylinder, 12.0 cm in radius, is 44.0 cm long. if the density of copper is 8.90 g/cm°, calculate the mass in grams of the cylinder. (assume pi= 3.14)

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

- lead + phosphoric acid = hydrogen + lead(ii) phosphate

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.