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mihalych1998 [28]
3 years ago
7

What method of heat transfer occurs when your skin feels hot outside on a sunny, summer day?

Chemistry
2 answers:
Stolb23 [73]3 years ago
4 0

Answer:

i checked it again it's B

Explanation:

radiation sorry

slavikrds [6]3 years ago
3 0

Answer:

B. Radiation

Explanation:

Lol this weekend I got a rlly bad sunburn and ik a lot ab the sun

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Which of the following is always a reactant in a combustion reaction? (5 points)
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Answer:

A

Explanation:

Combustion reaction always has something hydrocarbon plus oxygen gas which equals to carbon dioxide and water. Always being a reactant in a combustion reaction is oxygen, since reactants are what we start off the reaction with.

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__NH4NO3 ---> _N2 + _H2O + _O2
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It is decomposition synthesis Combustion.

Explanation:

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david’s mom wants to calculate how much it will cost to drive from los angeles, ca, to san francisco, ca. gas costs $4.00 a gall
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A substance that will change shape to fit its container but has a definite volume is in a phase of matter?
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What is the ph of a buffer prepared by adding 0.809 mol of the weak acid ha to 0.608 mol of naa in 2.00 l of solution? The disso
Anarel [89]

The pH of the buffer is 6.1236.

Explanation:

The strength of any acid solution can be obtained by determining their pH. Even the buffer solution strength of the weak acid can be determined using pH. As the dissociation constant is given, we can determine the pKa value as the negative log of dissociation constant value.

pKa=-log[H] = - log [ 5.66 * 10^{-7}]\\ \\pka = 7 - log (5.66)=7-0.753=6.247\\\\pka = 6.247

The pH of the buffer can be known as

pH = pK_{a} + log[\frac{[A-]}{[HA]}}]

The concentration of [A^{-}] = Moles of [A]/Total volume = 0.608/2 = 0.304 M\\

Similarly, the concentration of [HA] = \frac{Moles of HA}{Total volume} = \frac{0.809}{2} = 0.404

Then the pH of the buffer will be

pH = 6.247 + log [ 0.304/0.404]

pH = 6.247 + log 0.304 - log 0.404=6.247-0.517+0.3936=6.1236

So, the pH of the buffer is 6.1236.

5 0
3 years ago
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