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xeze [42]
3 years ago
12

Which selection contains elements that are NOT all in the same group?

Chemistry
1 answer:
Volgvan3 years ago
4 0

Answer:

Iron, copper , calcium

Explanation:

Iron , copper and calcium are present in three different groups.

Iron is present in group eight.

Copper is present in group eleven.

Calcium is present in group two.

Sodium , potassium and rubidium are present in same group i.e. group one. These are alkali metals.

Fluorine, chlorine and bromine are present in group seventeen. These are halogens.

Argon, Krypton and xenon are present in same group i.e, group eighteen. All are these noble gases.

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Consider the following chemical reaction: 2CH4(g) C2H2(g) + 3H2(g) Describe what is happening within the system when it is at eq
Naddika [18.5K]

Answer:

Equation is: 2CH4(g) <----> C2H2(g) + 3H2(g)

Explanation:

In the reaction above;

1.) At equilibrium, the rate of the forward reaction (CH4 decomposing into C2H2 and H2) is equal to the rate of the reverse reaction (C2H2 and H2 reacting to form CH4). This is because it is a reversible reaction.

2.) At equilibrium, the concentrations of all substances are not changing.

3.) At equilibrium, both the forward and reverse reactions are still occurring.

But if the pressure of the system is increased, the equilibrium position will shift to the left according to le Chatelier's principle since there are fewer number of moles of gaseous atoms at the left.

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3 years ago
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PLEASE HELP!!! A mineral that has no planes of weakness in its lattice structure will not break along straight lines. Which term
nignag [31]
The answer is Cleavage
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What are the different elements that make up a molecule of glucose?
Yanka [14]

Answer:

Glucose has a chemical formula of: C6H12O6 That means glucose is made of 6 carbon atoms, 12 hydrogen atoms and 6 oxygen atoms. You will be building one type of sugar called glucose.

Explanation:

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3 years ago
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Balance these equations​
kiruha [24]

Answer:

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One of the emission lines that provides the green color in fireworks, which com s from barium salts, has a wavelength of 505nm.
PSYCHO15rus [73]

Explanation:

(a)

The relation between frequency and wavelength is shown below as:

c=frequency\times Wavelength&#10;

c is the speed of light having value 3\times 10^8\ m/s

Given, Wavelength = 505 nm

Also, 1 m = 10^{-9} nm

So,  

Wavelength = 505\times 10^{-9} m

Thus, Frequency is:

Frequency=\frac{c}{Wavelength}

Frequency=\frac{3\times 10^8}{505\times 10^{-9}}\ Hz

Frequency=5.94\times 10^{14}\ Hz

(b)

Also, E=\frac {h\times c}{\lambda}

Where,  

h is Plank's constant having value 6.626\times 10^{-34}\ Js

c is the speed of light having value 3\times 10^8\ m/s

So,

E=\frac{6.626\times 10^{-34}\times 3\times 10^8}{505\times 10^{-9}}\ J

E=\frac{10^{-26}\times \:19.878}{10^{-9}\times \:505}\ J

E=3.94\times 10^{-19}\ J

(c)

Electromagnetic spectrum is range of the frequencies and their respective wavelengths of the various type of the electromagnetic radiation.

In order of the increasing frequency and the photon energy and the decreasing wavelength the spectrum are:  

Red , Orange, Yellow, Green, Blue, Indigo, Violet

Increasing wavelength is the opposite trend. Thus, The longest visible wavelength is red and the shortest is violet.

6 0
3 years ago
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