Astronomers have observed that the universe is expanding and is accelerating in all directions. Using this evidence, astronomers
have hypothesized that a huge explosion called the big bang created the universe. Which of the following correctly describes the big bang? Fact
Theory
Opinion
None of these
A scientific theory is a well-tested explanation for a wide range of observations or experimental results. A hypothesis is a possible answer to a question. When does a hypothesis become a scientific theory?
after the hypothesis is first formed by a scientist
after a hypothesis is shown to correct in one experiment
after the hypothesis has been confirmed through extensive testing
after a competing hypothesis has failed
Nicolas has completed the experimental portion of the lab. Which of these should he do while he works on the analysis questions?
talk to his friends who are still collecting data
keep his safety goggles on
keep his gloves on
work on another experiment he thought of
How do the independent and dependent variables in an experiment compare?
They are the exact same as one another.
They have no effect on one another.
The dependent variable controls the independent variable.
The independent variable controls the dependent variable.
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Ammonium Chloride NH4CI Fertilizer-grade NH4Cl usually contains 25% N. About two-thirds of the world capacity for manufacture of this material is located in Japan, with the remaining one-third situated in India and China.
