2 years ago

Which statement describes what it means for energy to be conserved?

Chemistry

2 answers:

Aloiza [94]2 years ago

5 0

• Energy released by a reaction is gained by the surroundings.

ch4aika [34]2 years ago

3 0

Answer:

energy released by a reaction is gained by the surroundings.

Explanation:

umm... I'm not 100% sure about this

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Determine the pH at the equivalence point for the titration of 40.0 mL of 0.1 M HNO2 by 0.200 M KOH (Example 16.7). (The pKa of

Fynjy0 [20]

Answer:

$pH=13.28$

Explanation:

Nitrous acid

$HNO_2 \longrightarrow H^+ + NO_2^-$

$Ka=\frac{[H^+][NO_2^-]}{[HNO_2]}$

$pKa=-log(Ka)=3.36$

$Ka=4.36*10^{-4}$

<u>Balance: </u>

$[H^+]=X$

$[NO_2^-]=X$

$[HNO_2]=0.1-X$

$Ka=\frac{X*X}{0.1-X}$

$4.36*10^{-4}=\frac{X^2}{0.1-X}$

$4.36*10^{-5}-4.36*10^{-4}*X=X^2$

Solving:

$X=6.4*10^{-3}$

The NaOH is in excess:

$[NaOH]_f=0.2-0.0064=0.1936$

$pH=14+log([OH^-])$

$pH=14+log(0.1936)=13.28$

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2 years ago

Hello can you please help me to solve above questions. .

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2 years ago

What is the difference between a sodium atom (Na) and a sodium ion (Na1+) ?

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One deals with electrons while the other protons.

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3 years ago

What Is the difference between organic and inorganic matter?

Charra [1.4K]

Organic compounds are compounds that contain carbon atoms.

Organic matter is any waste product that occurs naturally (i.e. snake skin, feces, and other traces of life).

Inorganic matter would lack carbon compounds. Radioactive waste at nuclear power plants is inorganic.

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3 years ago

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For the reaction C + 2H2 → CH4, how many grams of hydrogen are required to produce 13.1 moles of methane, CH4 ?

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Answer:

7.0

Explanation:

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2 years ago