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4 years ago

A chemical bond is an interaction between the - of two or more atoms.

1 answer:

4 0

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. The bond may result from the electrostatic force of attraction between oppositely charged ions as in ionic bonds or through the sharing of electrons. Hope that helps!

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Which chemicals would be the best indicator that the unknown substance is a plant?

arlik [135]

Cellulose and starch would be the indicator that the unknown substance is a plant.

6 0

3 years ago

2A (g) + Y (g) <-- --> 3C (g) + D (g)

insens350 [35]

Answer:

A. K = 59.5

Explanation:

Hello there!

In this case, since this reaction seems to start moving leftwards due to the fact that neither A nor Y are present at equilibrium, we should rewrite the equation:

3C (g) + D (g) <-- --> 2A (g) + Y (g)

Thus, the equilibrium expression is:

$K^{left}=\frac{[A]^2[Y]}{[C]^3[D]}$

Next, according to an ICE table for this reaction, we find that:

$[A]=2x$

$[Y]=x$

$[C]=0.651M-3x$

$[D]=0.754M-x$

Whereas x is calculated by knowing that the [C] at equilibrium is 0.456M; thus:

$x=\frac{0.651-0.456}{3} =0.065M$

Next, we compute the rest of the concentrations:

$[A]=2(0.065M)=0.13M$

$[Y]=0.065M$

$[D]=0.754M-0.065M=0.689M$

Thus, the equilibrium constant for the leftwards reaction is:

$K^{left}=\frac{(0.13M)^2(0.065M)}{(0.456M)^3(0.689M)}=0.0168$

Nonetheless, we need the equilibrium reaction for the rightwards reaction; thus, we take the inverse to get:

$K^{right}=\frac{1}{0.0168}=59.5$

Therefore, the answer would be A. K = 59.5.

Regards!

6 0

3 years ago

Why does carbon dioxide not combust and is therefore a bad fuel compared to hydrogen gas?

erma4kov [3.2K]

Answer:

But it is not used as domestic fuel, due to several reasons : Hydrogen is not easily available and cost of production is high Unlike other gases, hydrogen is not readily available in the atmosphere. It requires processes like electrolysis of water for its production. This is a very costly process and time consuming.

Explanation:

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3 years ago

Which of the following groups in the periodic

Dimas [21]

Elements of Group 1 and group 2 in the periodic table contain elements so reactive that they are never found in the free state

<u>Explanation</u>:

The metals in group 1 of periodic table consisting of 'alkali metals' which include lithium, potassium, sodium, rubidium, Francium and caesium. They are highly reactive because they have low ionisation energy and larger radius. The group 2 metals consist of 'alkaline earth metals' which include calcium, strontium, barium, beryllium, radium and magnesium. These alkaline earth metal have +2 oxidation number, hence are highly reactive.

These both group metals are mostly reactive and so are never found in a free state. When they are exposed to air they would immediately react with oxygen. Hence, are stored in oils to avoid oxidation.

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3 years ago

2 Polnts

Marina CMI [18]

Answer:

In chemistry, a symbol is an abbreviation for a chemical element. Symbols for chemical elements normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

Earlier symbols for chemical elements stem from classical Latin and Greek vocabulary. For some elements, this is because the material was known in ancient times, while for others, the name is a more recent invention. For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a new Latin name) because helium was not known in ancient Roman times. Some symbols come from other sources, like W for tungsten (Wolfram in German) which was not known in Roman times.

Explanation:

7 0

4 years ago

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