1. Make Observe an event. State only what we can
or .
2. Ask
Ask a question that helps us find out and the event happened. We must be
able to answer the question with , or . We may need to our question several times before it is.
3. Construct a
State the answer we think we’ll get when we ask
our question. This is called a
. It’s based on our best
understanding of the event.
4. Test the hypothesis with an

Test whether the hypothesis is .
During the investigation, we collect that
answers the testable question we asked.

Becquerel expected to find ( he developed the photographic plate that had sun-exposed minerals on top of it. becquerel expected to find ( he developed the photographic plate that had been in the closed drawer.

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer