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during an investigation, a scientist numbers three beakers. next, she pours 150 ml of liquid into each
beaker. each liquid is different.
then, the scientist adds 5 grams of white solid baking soda (nahco: ) to each beaker and stirs. she
observes the results.
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in which of the beakers does the scientist observe clear evidence of a chemical reaction?
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a beaker 1 only
b. beaker 2 only
c. beaker 3 only
d. beakers 2 and 3
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The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.