Which of the following happens during a chemical change? Check all of the boxes that apply
0 One atom or more changes into atoms of another element.
New substances with different properties are formed.
O Solids, liquids, or gases may form.
0 Reaction mixtures always give off some heat.
0 Reaction mixtures always need to be heated.

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Which three statements represent the benefits of performing experiments using computer simulations?

According to the passage, which of these is true about gray water systems? a) gray water systems use plants that require less water. eliminate b) gray water systems require the use of less fossil fuels. c) gray water systems reduce the amount of fresh water used. d) gray water systems reduce the amount water used by shower heads.