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tia_tia [17]
3 years ago
12

Which is not a compound? oxygen gas water silicon dioxide carbon dioxide gas

Chemistry
1 answer:
olchik [2.2K]3 years ago
7 0

Answer:

Oxygen gas

Explanation:

It is a pure element. The rest are compounds made up of two or more elements. For eg silicon dioxide is made of silicon and oxygen.

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You wish to construct a buffer of pH=7.0. Which of the following weak acids (w/ corresponding conjugate base) would you select?
Alex17521 [72]

Answer:

C.) HOCl Ka=3.5x10^-8

Explanation:

In order to a construct a buffer of pH= 7.0 we need to find the pKa values of all the acids given below

we Know that

pKa= -log(Ka)

therefore

A) pKa of  HClO2 = -log(1.2 x 10^-2)

=1.9208

B) similarly PKa of HF= -log(7.2 x 1 0^-4)= 2.7644

C)  pKa of HOCl= -log(3.5 x 1 0^-8)= 7.45

D) pKa of HCN = -log(4 x 1 0^-10)=  9.3979

If we consider the  Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution

The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.

So, near to value, pH=7.0. , the only option is HOCl whose pKa value is 7.45.

Hence, HOCl will be chosen for buffer construction.

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3 years ago
On January 2, 2020, Nash Company purchases a call option for $290 on Merchant common stock. The call option gives Nash the optio
notka56 [123]

Answer:

Explanation:

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5 0
3 years ago
Which kind of force is a dipole-dipole force?
dexar [7]

Answer:

Explanation:

Types of Attractive Intermolecular Forces. Dipole-dipole forces: electrostatic interactions of permanent dipoles in molecules; includes hydrogen bonding.

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7 0
3 years ago
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What happens if you put sugar in someone's gas tank?
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The sugar reacts with the gas, turning it to a semi-solid and sticky substance; clogging the gas lines along with many other things.
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3 years ago
Which type of substance ionizes completely and creates hydronium ions when dissolved in water?
maw [93]

Answer:

Strong acid

Explanation:

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2. Tetraoxosulphate (VI) acid

3. Trioxonitrate (V) acid

4. Hydroiodic acid

5. Hydrobromic acid

8 0
3 years ago
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