Chemistry, 15.10.2019 11:10 HarryPotterhead7
Based on their descriptions, classify these chemical changes as endothermic or exothermic.
1) a chemical change takes place in a container, making it feel cold to touch.
2) burning wood
3) a chemical change takes place in a container, making it feel hot to touch.
4) pocket hand warmers(used by skiers) start out at room temperature. when you open the air tight packaging, a substance reacts with air, and it quickly begins to feel hot.
5) a "cold pack" (used for sport injuries) starts out a room temperature. but when you squish the liquid around, you cause two substances to mix that were originally kept separate. those substances react and the pack begins to feel cold.
Answers: 1
Chemistry, 21.06.2019 21:00
Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing
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Chemistry, 22.06.2019 10:00
A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?
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Chemistry, 22.06.2019 12:10
Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.
Answers: 1
Based on their descriptions, classify these chemical changes as endothermic or exothermic.
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