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3 years ago

Dry ice will go directly from a solid to a gas at room temperature. Going directly from a solid to a gas is called_____________

Chemistry

2 answers:

miss Akunina [59]3 years ago

4 0

Answer:

Sublimatiom

Explanation:

Elena L [17]3 years ago

3 0

Answer:

When a solid changes into a gas, it is called sublimation.

Explanation:

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It takes 90 N of force to lift a box of books off my smiths table. If you can only leave the box 25% of the way up, how many new

leva [86]

Answer:3.6 I think sorry if wrong

Explanation:

90 divided by 25

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2 years ago

Describe Write your own caption for this photo.

koban [17]

Answer:

Sit by the fire to warm up

Explanation:

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2 years ago

What is the ratio of [a–]/[ha] at ph 2.75? the pka of formic acid (methanoic acid, h–cooh) is 3.75?

Varvara68 [4.7K]

The dissociation of formic acid is:

$HCOOH \rightleftharpoons HCOO^{-} + H^{+}$

The acid dissociation constant of formic acid, $k_a$ is:

$k_a = \frac{[HCOO^{-}] [H^{+}]}{HCOOH}$

Rearranging the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

pH = 2.75

$pH = -log[H^{+}]$

$[H^{+}]= 10^{-2.75} = 1.78 \times 10^{-3}$

$pk_a = 3.75$

$k_a = 10^{-3.75} = 1.78\times 10^{-4}$

Substituting the values in the equation:

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{k_a}{[H_+]}$

$\frac{[HCOO^{-}]}{[HCOOH]} = \frac{1.78\times 10^{-4}}{1.78\times 10^{-3}}$

Hence, the ratio is $\frac{1}{10}$ .

4 0

3 years ago

Draw the structure of 4-methyl-5-oxohexanal.

aniked [119]

Answer:

Explanation:

The structural formula provides more information which is often used to represent a particular organic substance. A structural formula indicates how the atoms are arranged within the molecule of a substance. From the information, the structure of 4-methyl-5-oxohexanal is represented by using a stick formula where the methyl group falls into position 4 and oxygen group falls into position 5 on the hexanal compound.

The structure is provided in the image attached below for better understanding.

4 0

3 years ago

A chemical reaction resulting in the transfer of electrons or hydrogen atoms from one molecule to another is called a(n) _______

anzhelika [568]

The kind of reaction involving the transfer of electrons or hydrogen away from a molecule is called oxidation.

In the same vein, the molecule that receives the electron or the hydrogen atom is said to be reduced. This means that oxidation cannot exist in isolation without reduction.

In other words, oxidation is defined as:

Loss of electrons
Loss of hydrogen atoms
Gain of oxygen atoms
Gain in oxidation number

While reduction is defined as:

Gain of electrons
Gain of hydrogen atom
Loss of oxygen atom
Reduction in oxidation number

More on oxidation/reduction reactions can be found here: brainly.com/question/3867774

7 0

2 years ago

Read 2 more answers