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lys-0071 [83]
3 years ago
6

PLEASE HELP WITH MY CHEM ASSIGNMENT!!!

Chemistry
1 answer:
aalyn [17]3 years ago
6 0

Answer: 209.2

Explanation:

4. q = mcat

    q = 5g(4.184)(40-50)

    q = -209.2

the negative sign indicates that heat is given off

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I know the photo trash but i need answers for the top middle and last question please :)
Firlakuza [10]

Answer:

Middle: Self heating containers are really expensive but are useful because they are easy to use, portable, and can be recycled, unlike a camp stove which is not as easily moved.

Explanation:

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6 0
2 years ago
A solution with a [H+] of 1.22x10-3M has a pH of _____________________.
Kryger [21]

Answer:

2.91

Explanation:

pH=-log(H3O+)

- Hope that helps! Please let me know if you need further explanation.

7 0
3 years ago
Calculate the mass of 12.044*10^23atom of carbon
Keith_Richards [23]

Answer: 24 gram is a final Answer.

Explanation:1 mol of carbon weight is 12 gram then

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4 0
3 years ago
All of the following can be used to define an acid except
Norma-Jean [14]

Answer: a substance that increases the hydroxide ion concentration of a solution

Explanation: According to Arrhenius concept, an acid is a substance which donates hydronium ions  [H^+] ions when dissolved in water and base is a substance which donates hydroxide ions [OH^-] ions in water.

According to the Bronsted Lowry conjugate acid-base pair, an acid is a substance that donates protons and a base is a substance that accepts protons.

According to Lewis concept, an acid is the substance which accepts electron pairs and abase is a substance which donates electron pairs.

Thus a substance that increases the hydroxide ion concentration of a solution is an Arrhenius base.

8 0
3 years ago
What precautions must be taken when you introduce a mixture of compounds to be separated onto a liquid chromatography column?
earnstyle [38]

<span>The slim exit of the column is first persisted with glass wool or a permeable plate in order to sustain the column packing element and keep it from getting out of the tube. Then the adsorbent solid, which is usually a silica, is firmly packed into the glass tube to make the separating column. The packing of the non-moving phase into the glass column must be done with precaution to create an even distribution of material. An even distribution of adsorbent material is very important to lessen the existence of air bubbles and/or channels inside the column. To finish preparing the column, the solvent to be used as the mobile phase is delivered through the dry column. Then the column is said to be "wetted" and the column must stay wet throughout the entire procedure. Once the column is properly prepared, the sample to be separated is placed at the top of the wet column.</span>

5 0
3 years ago
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