Barbara completed an assignment for extra credit in science class. She used a pH meter to find the pH of different substances. After she finished measuring the pHs, she created a diagram that showed the substances arranged in order from the most acidic to the most basic.

If Barbara added lemon juice—pH 2.2—to her investigation, where should it appear in her diagram?
A.
between milk and water
B.
to the left of cola
C.
between soap and bleach
D.
between water and blood

Achemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. an example of a chemical reaction is the formation of water from hydrogen and oxygen gas. in a physical change, a substance changes its physical appearance but not its chemical identity. an example of physical change is the formation of liquid water from solid water, a familiar process called melting. physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? oxygen gas changes to ozone during thunderstorms carbon dioxide is produced by the combustion of gasoline in an automobile engine. when coal, oil, and natural gas are decomposed in landsills they produce methane gas. freezing rain develops when a warm air mass overrides a cold air mass. fog forms from water vapor when the temperature drops below the dew point

How does concentration affect reaction rate

What conclusion can you draw from this experiment about the components of the black ink?