What does a chemical reaction always produce?

A) A different phase of matter (solid from liquid, gas from liquid, etc.)

B) A physical change

C) A chemical change

D) Heat

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

What will most likely happen when two bromine atoms bond together?

Which of the following is the molecular formula for a simple sugar? a. cooh b. h2o c. oh d. c6h12o6