Q: A change in the environment that causes a response is known as a

OPTIONS:
- stimulus
- habit
- reflex
- source
A: stimulus
Q: The chemical formula for water is H_{2}O. What does the formula show about each element in the compound?

OPTIONS:
- the number of valence electrons
- the charge of the compound
- the mass of protons in each atom
- the number of atoms of each element
A: the number of atoms of each element
Q: A student wants to find the relationship between the diameter of several plastic disks and the circumference of each disk. Which of these types of graphs should be constructed to determine this relationship?

OPTIONS:
- pie graph
- line graph
- scatterplot
- box-and-whisker plot
A: line graph
Q: Which action illustrates a chemical change?

OPTIONS:
- painting a wood chest
- sawing a wood plank
- burning wood chips
- cutting down a tree
A:
burning wood chips