CHEMISTRY HIGH SCHOOL

The atoms of Group 7A elements _____ electrons when they form ions.A. share
B. gain
C. lose
D. cannot be determined

Answers

Answer 1
Answer:

There are various kind of elements that are present in periodic table. Some elements are harmful, some are halogens, some are radioactive. Option B is correct option.

What is periodic table?

Periodic table is a table in which we find elements with properties like metals, non metals, metalloids and radioactive element arranges in increasing atomic number.

Periodic table help a scientist to know what are the different types of elements are present in periodic table so that they can discover the new elements that are not being discovered yet.

Group 7A elements includes halogens elements like Fluorine, Chlorine, Bromine and iodine, whose electronegativity is very high in whole periodic table. These element gain electron very easily.

Therefore, the correct option is option B.

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Answer 2
Answer: The answer is B. gain. The elements from group 7a is F, Cl, Br, I... These elements has 7 electrons at the outer shell. And they are likely to gain one electron to stay at stable status.

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Of these nonmetals, which one is likely to be the least reactive?A. nitrogen (N)
B. phosphorous (P)
C. sulfur (S)
D. oxygen (O)

Answers

Answer: Phosphorous

Explanation: Nitrogen(N): 7: 1s^22s^22p^3

Phosphorus(P): 15:1s^22s^22p^63s^23p^3

Oxygen(O): 8:1s^22s^22p^4

Sulphur(S): 16:1s^22s^22p^63s^23p^4

As nitrogen contains half filled configuration, it is stable and does not react. Phosphorous lies below nitrogen and reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.

Oxygen has 4 valence electrons, thus it need to gain two electrons to attain stable configuration. Thus is reactive.

Sulphur lies below oxygen and also need to gain two electrons. Reactivity decreases down a group for non metals as they tend to gain electrons as the valence shell move away from the nucleus.
Reactivity increases upward and decreases leftward for these nonmetals. Thus oxygen would be the most reactive since it is the most rightward and upward.

You fill a rigid steel cylinder that has a volume of 20.0 L with nitrogen gas to a final pressure of 2.00 *10^4 Kpa at 28c How many kilograms of N2 does the cylinder contain

Answers

The quantity of nitrogen the cylinder contains is 4477.8 g

What is pressure?

Pressure is a force exerted in a perpendicular direction in any item.

By ideal gas law

PV = nRT

P =(w)/(M) =(RT)/(V)\n

w = mass

Volume is 20.0 l

Pressure is  2.00 * 10^4 \;Kpa

The molar mass of nitrogen is 28 g/mol

R is gas constant = 0.0821

Temperature is 28 converted into kelvin that is 301 k

Putting the values

197.6 =(w)/(28) =(0.0821 * 301 )/(20\;l)\n\nw = 4477.8 g

Thus, the mass of nitrogen is 4477.8 g.

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Answer : The mass of N_2 gas is, 4477.8 g

Solution :

using ideal gas equation,

PV=nRT\n\nP=(w)/(M)* (RT)/(V)

where,

n = number of moles of gas

w = mass of gas

P = pressure of the gas = 2* 10^4Kpa=197.6atm

conversion :1atm=101.2Kpa

T = temperature of the gas = 28^oC=273+28=301K

M = molar mass of N_2 gas = 28 g/mole

R = gas constant = 0.0821 Latm/moleK

V = volume of gas = 20 L

Now put all the given values in the above equation, we get the mass of gas.

197.6atm=(w)/(28g/mole)* (0.0821Latm/moleK* 301K)/(20L)

w=4477.8g

Therefore, the mass of N_2 gas is, 4477.8 g

An estser is the reaction product between: a. Alcohol and organic acid B. Alcohol and oxygen
C. Ketones and Oxygen.
D. Aldehydes and Alcohol

Answers

An ester is the reaction product between A. alcohol and organic acid. 

All of the following are abiotic factors in an ecosystem except:Minerals
Soil
Plants
Temperature

Answers

Answer:

The correct answer is ' plants'.

Explanation:

Abiotic factors : These are the non living physical and chemical parts of the environment that effects living organism and the ecosystem.For example: miner;as, soil, temperature, pressure etc.

Biotic factors: These are the living organisms which effects the functioning  of the ecosystem and other living beings. For example: plants , animals, microorganism etc.

Final answer:

In an ecosystem, plants are not considered an abiotic factor, but a biotic factor since they are living organisms. Abiotic factors are non-living components such as minerals, soil, and temperature.

Explanation:

In an ecosystem, factors are broken down into two components: abiotic and biotic. Abiotic factors are the non-living components of an ecosystem, which include sunlight, temperature, wind patterns, soil, and minerals. On the other hand, biotic factors are the living components that interact with both the abiotic factors and other biotic factors. Examples of these include plants, animals, fungi, and bacteria.

In your given options, minerals, soil, and temperature are all examples of abiotic factors as they are all non-living components. However, plants are considered biotic factors as they are living organisms that directly interact with both the abiotic and biotic components of the ecosystem. Thus, the answer is plants.

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Explain the process on how the conditions for lightning to strike occurs?

Answers

"A cloud-to-ground lightning strike starts as a channel of negative charges makes its path towards the ground. This occurrence is known as a stepped leader. The stepped leader continues towards the ground in a series of steps that are each about 50 to 100 metres in length. This stepped leader can branch out in many directions. A lightning strike refers to as a lightning flash, is usually made up of more than one stroke of lightning. After the initial strongest stroke, subsequent weaker strokes can follow which usually (but not always) follow the same path of the initial stroke. "

When a chemical reaction is in equilibrium, a. the reaction is proceeding at its maximum rate.
b. there is no net change in the amount of substrates or products.
c. the reaction has stopped.
d. there are equivalent amounts of substrates and products.

Answers

Answer: b. there is no net change in the amount of substrates or products.

Explanation:

The reactions which do not go on completion and in which the reactant forms product and the products goes back to the reactants simultaneously are known as equilibrium reactions.

Equilibrium state is the state when reactants and products are present but the concentrations does not change with time.

A\rightleftharpoons B

For a chemical equilibrium reaction, equilibrium state is achieved when the rate of forward reaction becomes equals to rate of the backward reaction.
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