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.

Select the correct answer. which statement is true about a polarized object? o a. it gains electrons and becomes negatively charged. ob. it gains protons and becomes positively charged. oc. the number of positive and negative charges can be the same. od. it has to be a metal. o e. there is no change in the distribution of the charge in the object. reset next what

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons

How many atoms are there in 5.70 mol of mg