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3 years ago

Explain why the atomic radius decreases across a period and increases down a group ?

Chemistry

1 answer:

andreyandreev [35.5K]3 years ago

4 0

Answer:

In general, atomic radius decreases across a period and increases down a group. ... Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.

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Without performing any calculations, determine whether the entropy of the system increases or decreases in the photosynthesis of

e-lub [12.9K]

Answer:

2. Decreases

Explanation:

From the combined concept of entropy and the second law of thermodynamics, it can be concluded that during the positive change in entropy, the degree of randomness of a system increases.

But in case of photosynthesis, we see a negative entropy change because in the process of photosynthesis plants take disordered things as $CO_2$ from the atmosphere and water from soil and finally make a highly ordered molecule Glucose, which is further used as a food product and source of energy by the plants. Thus it is clear that degree of randomness in decreasing in the process of photosynthesis and it is a negative change in entropy.

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3 years ago

A sample of gas in a syringe has a volume of 9.66 mL at a pressure of

Zolol [24]

The answer is 6.58mL or 0.00658L. How I got this answer step by step is included in the photo below. Hope this helps!

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4 years ago

A positive charge is placed at rest at the center of a region of space in which there is a uniform, three-dimensional electric f

Vladimir [108]

Answer:

Ans- It will decrease as the charge travels towards the electrical field.

Explanation:

Ans- It will decrease as the charge travels towards the electrical field.

As we have learn, F= qE i.e. the electrical field will exert a force on the positively charged in the direction of the electrical field, this will accelerate the positive charge resulting in the conversion of potential energy into kinetic energy.

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4 years ago

One<br> 63 Cu atom has a mass of 1.045 x 10-22 g. Calculate the mass of 3.0 moles of 63Cu atoms

12345 [234]

The mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

<h3>Stoichiometry</h3>

From the question, we are to calculate the mass of 3.0 moles of ⁶³Cu atoms.

From the given information,

One ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

First, we will determine the number of atoms present in 3.0 moles of ⁶³Cu atoms

Using the formula,

Number of atoms = Number of moles × Avogadro's constant

Number of ⁶³Cu atoms present = 3.0 × 6.022 × 10²³

Number of ⁶³Cu atoms present = 18.066 × 10²³ atoms

Now, we will determine the mass of 18.066 × 10²³ ⁶³Cu atoms

If 1 ⁶³Cu atom has a mass of 1.045 × 10⁻²² g

Then,

18.066 × 10²³ ⁶³Cu atoms will have a mass of 18.066 × 10²³ × 1.045 × 10⁻²²

18.066 × 10²³ × 1.045 × 10⁻²² = 188.7897 g

≅ 188.8 g

Hence, the mass of 3.0 moles of ⁶³Cu atoms is 188.8 g

Learn more on Stoichiometry here: brainly.com/question/13654901

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2 years ago

Partitioning of toxic chemicals in the environment refers to:

shtirl [24]

Answer:

The correct answer is b movement between different compartments(Such as between water and air).

Explanation:

The partitioning of a particular substance refers to the distribution of that substance into different compartments.

By the same way partitioning of toxic compounds in the environment refers to movement of toxic substances between different compartments of environment which includes air,water etc.

3 0

3 years ago

Explain why the atomic radius decreases across a period and increases down a group ?​

Explain why the atomic radius decreases across a period and increases down a group ?