John hypothesized that dissolving salt into water produced a chemical reaction because the salt completely disappeared in the water. He dissolved 10 grams of salt into 500 mL of pure water. After leaving the beaker in the sunlight a few days, the water completely disappeared and salt crystals were left in the bottom of the beaker. Based on this observation, John knew his hypothesis was incorrect because-​

Answer:

Explanation:

John knew his hypothesis was incorrect because he was left with the exact some compounds as he had started with. Something is only a chemical reaction if it changes the actual chemical structure and/or identity of a reactant. In this case, John mistook a physical change for a chemical change. The salt changes forms from solid to aqueous (dissolved in water), but did not change on a molecular level. Also, no new products were produced in the reaction and it did not show any of the 5 indicators of chemical reactions (temperature, colour and/or odour changes, formation of precipitate, production of a gas)

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In Passage 1, the reference to "bonds" (line 5) mainly serves to
A
insert a personal opinion into an otherwise
objective discussion of social rights.
B
suggest that all people must rely on one another
in a state of nature.
emphasize the point that one has to relinquish
some freedom in order to join a community.
call into question the idea that natural liberty
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E
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b.
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PEOPLE HELP I DONT WANT TO FAIL John hypothesized that dissolving salt into water produced a chemical reaction because the salt completely disappeared in the water. He dissolved 10 grams of salt into 500 mL of pure water. After leaving the beaker in the sunlight a few days, the water completely disappeared and salt crystals were left in the bottom of the beaker. Based on this observation, John knew his hypothesis was incorrect because- O A. the salt failed to completely dissolve in the water. B. the sunlight caused the chemical reaction to stop. C. the temperature of the pure water was below room temperature. O D. the salt and water were separated by a physical process. ​

I need help with this. No calculator allowed.

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What is a cookie? I don't understand what the answer is here's 10 points if you give a good answer ;)

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