A food item that is left out of the refrigerator turns brown and forms bubbles and gas. What are the signs that this is a chemical reaction? Check all that apply.

Heat is produced.
Heat is absorbed.
Bubbles appear.
A precipitate forms.
The color changes.

The modern periodic table has groups.

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

What is the correct lewis structure for chloroform chcl3