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Brums [2.3K]
2 years ago
10

What reaction is a reaction in which energy is absorbed

Chemistry
1 answer:
Papessa [141]2 years ago
4 0

Answer: endothermic

Explanation: Endothermic Reactions. A system of reactants that absorbs heat from the surroundings in an endothermic reaction has a positive (H), because the enthalpy of the products is higher than the enthalpy of the reactants of the system.

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What instrument is used to find the density of an object
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Hydrometers

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Explanation:

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The metric unit of force is the<br> A. nanometer.<br> B. gram.<br> C. newton.<br> D. kilogram.
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Find the independent variable and the dependent variable :)))
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Calculate the pH of the solution that results when 20 mL of 0.2M HCOOH is mixed with 25mL of 0.2M NaOH solution.(post-equivalenc
Paul [167]

The pH of the solution : 12

<h3>Further explanation</h3>

Reaction

HCOOH    +     NaOH   ⇒     HCOONa   +   H₂O

mol HCOOH =

\tt 20~ml\times 0.2~M=4~mlmol

mol NaOH =

\tt 25~ml\times 0.2~M=5~mlmol

Mol NaOH>mol HCOOH ⇒ at the end of the reaction there will be a strong base remains from mol NaOH, so that the pH is determined from [OH⁻]

ICE method :

HCOOH    +     NaOH   ⇒     HCOONa   +   H₂O

4                          5

4                          4                     4                   4

0                          1                      1                    1

Concentration of [OH⁻] from NaOH :

\tt \dfrac{1~mlmol}{20+25~ml}=0.02

pOH=-log[OH⁻]

pOH=-log 10⁻²=2

pH+pOH=14

pH=14-2=12

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3 years ago
Which substance is not a structural isomer of hexyne?
stich3 [128]

Answer:

c) 3,3-dimethylpent-1-yne

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