CHEMISTRY HIGH SCHOOL

As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element(1) decreases
(2) increases
(3) remains the same

Answers

Answer 1
Answer:

As the elements in Group 17 are considered in order of increasing atomic number, the chemical reactivity of each successive element decreases.

What is reactivity?

The impetus for a chemical substance to undergo a chemical reaction, either by itself or with other materials, with an ease and overall release of energy is referred to as reactivity.

Group 17 are the halogens group and on moving from top to bottom across that group atomic size of the atoms increases due to the increase in the number of energy shells. As a result of which it decreases the affect of nuclear attraction force to the outer most valence shell decreases.

Hence, reactivity decreases.

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Answer 2
Answer: It decreases, because there is less attraction between the outermost shell and the nucleus - called the shielding effect - meaning it's harder for the element to attract the last electron

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Answer:

a rain of asteroids coming from space

Explanation:
Meteor showers occur when dust or particles from asteroids or comets enter Earth's atmosphere at very high speed. When they hit the atmosphere, meteors rub against air particles and create friction, heating the meteors. The heat vaporizes most meteors, creating what we call shooting stars.

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1m=1000mm

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Answer:hello

Explanation:

Task masters

Is correct! It should be answer(4) or (D)

What is the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K ? Express your answer using three significant figures. Would the volume be different if the gas was argon (under the same conditions)? The volume would be the lower for argon gas. The volume would be the same for argon gas. The volume would be the greater for argon gas.

Answers

Answer: 2.93 L

Explanation:

AI-generated answer

To find the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K, we can use the ideal gas law equation:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

Rearranging the equation to solve for V:

V = (nRT) / P

Plugging in the given values:

n = 0.108 mol

R = 0.0821 L·atm/(mol·K) (the ideal gas constant)

T = 306 K

P = 0.909 atm

V = (0.108 mol * 0.0821 L·atm/(mol·K) * 306 K) / 0.909 atm

Calculating this expression, we find that the volume occupied by 0.108 mol of helium gas at a pressure of 0.909 atm and a temperature of 306 K is approximately 2.93 L.

Now, let's consider the second part of the question: Would the volume be different if the gas was argon (under the same conditions)?

The volume would be the same for argon gas.

According to the ideal gas law, at the same temperature, pressure, and number of moles, the volume occupied by a gas is the same regardless of the gas's identity. Therefore, if we replaced helium gas with argon gas while keeping the same conditions of pressure, temperature, and number of moles, the volume occupied by argon gas would be the same, approximately 2.93 L.

Which is the electronic configuration for oxygen?1s2 2s2 2p1
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p6

Answers

Answer:

                     1s², 2s², 2p⁴

Explanation:

                      Electronic configuration is the distribution of electrons of an atom in atomic orbitals. As we know Oxygen is a non metal and is present in group 6 and period 2 with atomic number 8. The atomic number in fact specifies the number of protons. Hence, for a neutral oxygen atom there must be 8 electrons to balance the charges of protons.

                        These 8 electrons are distributed in two main energy levels i.e. n = 1 and 2 and sub energy levels i.e. s and p. According to certain rules like Aufbau Principle, Pauli's Exclusion Principle and Hund's Rule the electronic configuration for eight electrons is as,

                                           1s², 2s², 2px², 2p¹, 2p¹

Final answer:

The electronic configuration for oxygen is 1s2 2s2 2p4.

Explanation:

The electron configuration for oxygen is 1s2 2s2 2p4.



In the electron configuration, the numbers represent the energy levels (1s, 2s, 2p), and the superscripts represent the number of electrons in each orbital. The electron configuration follows the Aufbau principle, which states that electrons fill the lowest energy levels first.



In the case of oxygen, there are 8 electrons in total. The first two electrons fill the 1s orbital, the next two fill the 2s orbital, and the remaining four fill the 2p orbital (with two electrons each in the three 2p orbitals).

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How can the use of biotechnology lead to the increase in soil practices

Answers

Biotechnology is the use of biological processes for industrial use. This is especially used in the manipulation of microorganisms for producing antibiotics, hormones and other products. Today, biotechnology has been the center of research and development. Using this for developing soil practices will surely help people and will have a great impact. Through biotechnology, we can increase soil health and the nutritive value of the soil for plants.

Answer:

A) Biotechnology use can lead to a decrease in pesticide and herbicide use, maintaining soil quality.

Explanation:

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