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4 years ago

What happens when elements combine to form compounds?

1 answer:

7 0

When the elements combine form compounds, they do it to become stable. They give and taker the outside electrons or by sharing outer ring electrons.

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The specific heat capacity of lead is 0.13 J/g-K. How much heat (in J) is required to raise the temperature of 15 g of lead from

Alona [7]

Answer:

c. 29 J

Explanation:

Step 1: Given data

Specific heat capacity of Pb (c): 0.13 J/g.K (= 0.13 J/g.°C)

Mass of Pb (m): 15 g

Initial temperature: 22 °C

Final temperature: 37 °C

Step 2: Calculate the temperature change

ΔT = 37 °C - 22 °C = 15 °C

Step 3: Calculate the heat (Q) required to raise the temperature of the lead piece

We will use the following expression.

Q = c × m × ΔT

Q = 0.13 J/g.°C × 15 g × 15 °C = 29 J

6 0

3 years ago

List the procedural steps, from start to finish, that are required to convert 2‑naphthol and allyl bromide into allyl 2‑naphthyl

elena-14-01-66 [18.8K]

<h3>Procedural steps are: - </h3>

On a small scale, the reaction is carried out by combining the alcohol, the haloalkane, and the phase transfer catalyst in a conical vial.
To start the reaction, sodium hydoxide (base) is added.
To prevent solvent evaporation, the reaction flask is covered and stirred during the reaction.
TLC monitors the reaction's progress to ensure that no time is wasted.
To remove any remaining water, the reaction solution is dried over calcium chloride.
Column chromatography is used to purify the product, and evaporation is used to collect it.

<h3>What is Catalysis?</h3>

Catalysis is the process of boosting the pace of a chemical reaction by using a catalyst. Catalysts are not consumed in the reaction and so survive it.

To learn more about catalysis from the given link

brainly.com/question/1372992

#SPJ4

8 0

2 years ago

In the chart, the organism Rr represents a genetically _____________ individual.

GalinKa [24]

Organism<span>. ' s rate of mutation is directly proportional to its adaptability. .... D. The cell membrane contains </span>genetic<span> information of the cell. .... </span>What<span> cellular structure was the dialysis tubing most likely</span>representing<span> in this experiment? ...... C </span>Rr<span> and </span>rr<span> only ... A healthy </span>individual<span> is a carrier of a lethal allele but is unaffected by it.</span>

4 0

3 years ago

Read 2 more answers

Which of the following has the lowest Ka?a. carbonic acid b. dihydrogen phosphate c. phosphoric acid d. bicarbonate

Naya [18.7K]

Explanation:

A compound or molecule which will have least dissociation and that is not able to given hydrogen ion easily upon dissociation will also have a low value of $K_{a}$ .

Dissociation of the given compounds or species will be as follows.

$H_{2}CO_{3} \rightleftharpoons H^{+} + HCO^{-}_{3}$

$H_{2}PO^{-}_{4} \rightleftharpoons H^{+} + HPO^{-}_{4}$

$H_{3}PO_{4} \rightleftharpoons H_{+} + H_{2}PO^{-}_{4}$

As, chemical formula of bicarbonate is $HCO^{-}_{3}$ and due to the presence of a negative charge it is difficult to lose a positively charged hydrogen ion. This is because oppositely charged ions will be bonded by strong force of attraction.

Hence, it will not easily lose a hydrogen ion due to which bicarbonate has the lowest $K_{a}$ .

Thus, we can conclude that out of the given species bicarbonate has the lowest $K_{a}$ .

7 0

3 years ago

Which career is most concerned with the study of radioactive isotopes? biochemist nuclear chemist organic chemist nuclear engine

natali 33 [55]

A person who studies radioactive isotopes is known as a nuclear chemist.

Hope it helped!

4 0

4 years ago

Read 2 more answers