All of the following are clues to a chemical change EXCEPT a. The production or transfer of heat
b. When the substance changes shape
c. When a precipitate forms
d. When smoke or gas is produced

Figure 10-1 study figure 10-1. the strong nuclear force felt by a single proton in a large nucleus

How does a scientist the government? a. the scientist tells people in society what to do. b. the scientist determines the policies that the government spends money on. c. the scientist provides unbiased information to the government. d. the scientist makes laws based on his or her research results.

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?