Q. Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He​

Answer:

heat is released in going from reactants to products

Explanation:

hope this helps

Answer:

A-1,

B-2,

C-3 is the answer of this queation

Answer:

biofuel as it have many benefits and are emitted with greater advantages

Answer:

the number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge

Explanation:

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Answer:

Explanation:

Let's start b writing down coordinates of all points:

A(0,0,0)

B(0,5,0)

C(3,5,0)

D(3,0,0)

E(3,0,4)

F(0,0,4)

G(0,5,4)

H(3,5,4)

a.) When we reflect over xz plane x and z coordinates stay same, y coordinate  changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.

A(0,0,0)

Reflecting

A(0,0,0)

B(0,5,0)

Reflecting

B(0,-5,0)

C(3,5,0)

Reflecting

C(3,-5,0)

D(3,0,0)

Reflecting

D(3,0,0)

b.)

A(0,0,0)

Moving

A(-2,-3,1)

B(0,-5,0)

Moving

B(-2,-8,1)

C(3,-5,0)

Moving

C(1,-8,1)

D(3,0,0)

Moving

D(1,-3,1)

ANSWER

= 238.09cm³

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Answer:

Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.

Explanation:

Atom refers to the smallest constituent unit of a chemical element. Molecules refer to a group of two or more atoms that are held together due to chemical bonds.

Answer: Atoms are single neutral particles while molecules are neutral particles made of two or more atoms bonded together

Answer:  1 g H2 gas

Explanation:  

8g O2 = 0.25 moles

1g H2 = 0.50 moles [I assume you mean H2, not H.  If it is H, then moles = 1.0 moles H

7g N2 = 0.25 moles

1.5 g He = 0.43 moles

===============

The moles above are based on molecules.  All but He are multiplied by 2 to give the number of atoms.  If H2 is correct, it has the greatest number of atoms.  (Not if it is just H).

Now lets she s-subshell structure .

Take an element Berylium

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}}[/tex]

You can see the S-orbital has only space for 2electrons .

Come to p-orbital

Take an element Neon

[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}\overset{2p^6}{\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow} }}[/tex]

The 2 means its L shell .

It has 8 electrons only and full filled .

Answer:  1 mole of stacked pennies would reach a height of 5.69x10^17 miles.

Explanation:   The U.S. penny has a thinkness of 1.52mm.  One mole of pennies would have:

(1 mole pennies)(6.02x10^23 pennies/mole)*(1.52mm/penny) = 9.15x10^23 mm for 1 mole of pennies.  One mile = 1.609x10^6 mm.

(9.15x10^23 mm)/( 1.609x10^6 mm/mile) = 5.69x10^17 miles for 1 mole of pennies.  

That would reach Alpha Centauri (5.69x10^17 miles/2.6 x 10^13 miles)= 2.19x10^4 times.  

There is a coin shortage in the US, so good luck.  Send me your spare pennies.

[Note:  I did this quickly, so please check the work.  A mole is indeed a big number, but . . .]

Answer:

If you increase the mass at a given force the rate of acceleration slows. Therefore, mass is inversely proportional to acceleration. ... Force is directly proportional to acceleration (force ~ acceleration) As force increases acceleration increases.

acceleration slows down .

Explanation:

if we increase the mass at a given force the rate of acceleration slows

Answer:

21.09 g of AgCl

Explanation:

Hopefully the picture is clear and the method is understandable.

For more information go to

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Explanation:

just take the given moles and multiply it with the ratio of molecules to moles to get your answer

The number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

Avogadro's number( 6.02 × 10²³) is equal to the number of molecules in 1 mole of substance.

That is,

1 mole of N2 = 6.02 × 10²³

6 moles of N2 = 6 × 6.02 × 10²³

= 36.12 × 10²³

= 3.6 × 10²⁴

Therefore, the number of nitrogen molecules in 6.0 moles of N2 is = 3.6 × 10²⁴

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Since we know that 1.245g of Cu(OH)2 was obtained after the solid precipitated in water, it means that the remaining has to be CuSO4. Thus, we can take the difference between the two masses to get the mass for CuSO4.

After that, divide the mass of CuSO4 by the overall mass of the impure substance, multiply it by 100, and you will get the percentage of purity.

Answer:

4 ans is 3,5ans is iv i know only this much

Answer:

A beam of light (implicitly a plane wave) in vacuum or in an isotropic medium propagates in the particular fixed direction specified by its Poynting vector until it encounters the interface with a different medium. The light causes the charges (electrons, atoms, or molecules) in the medium to oscillate and thus emit additional light waves  that can travel in any direction (over the sphere of 4π steradians of solid angle). The  oscillating particles vibrate at the frequency of the incident light and re-emit energy  as light of that frequency (this is the mechanism of light “scattering”). If the emitited light is “out of phase” with the incident light (phase difference ∼= ±π radians),  then the two waves interfere destructively and the original beam is attenuated. If the  attenuation is nearly complete, the incident light is said to be “absorbed.” Scattered  light may interfere constructively with the incident light in certain directions, forming  beams that have been reflected and/or transmitted. The constructive interference of  the transmitted beam occurs at the angle that satisfies Snell’s law; while that after  reflection occurs for θreflected = θincident. The mathematics are based on Maxwell’s  equations for the three waves and the continuity conditions that must be satisfied  at the boundary. The equations for these three electromagnetic waves are not difficult to derive, though the process is somewhat tedious. The equations determine the  properties of light on either side of the interface and lead to the phenomena of:

1. Equal angles of incidence and reflection;

2. Snell’s Law that relates the incident and refracted wave;

3. Relative intensities of the three waves;

4. Relative phases of the three light waves; and

5. States of polarization of the three waves.

Explanation:

Answer:

I've short trick for you to remember litmus

BRA = Blue to Red ➜ Acid

RBB = Red to Blue ➜ Base

0 to 7 ➜ Acidic

7 ➜ Neutral

7 to 14 ➜ Basic

Ans 1:

Ans 2:

Ans 3:

Ans 4:

-TheUnknownScientist

Answer:silicon (Si) and geranium (Ge)

Explanation:

Silicon and germanium have the same valency. So the correct option is C.

Valence is also referred valency, in the field of chemistry is  defined as the property of an element which will determine how many other atoms can this atom combine with

This term was introduced in the year 1868. It is mainly used to present the combination ability of an element in general and also the numerical value of that power of combination.

A major challenge for the chemists of the 19th century was the explanation and the systematization of valency.

When there was an absence of a determination of its cause, the efforts started to centre on the development of empirical rules for determining the numerical values of valences.

The number of atoms of hydrogen with which an atom of the atom can combine or can replace a compound is defined as the characteristic valences for the elements.

Therefore the correct option is C.

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Answer:

Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, most wildfires are because of human carelessness such as arson, campfires, discarding lit cigarettes, not burning debris properly, playing with matches or fireworks.

Answer:

A

Explanation:

Answer:

Iron shavings

Explanation:

A substance that has a fixed chemical composition throughout and a mixture is when two or more substances are combined, but they are not combined chemically.

bronchial tube is organ of the respiratory system is located inside the lungs

The process in which the living cells of an organism obtains energy by taking in oxygen and release carbon dioxide as waste product called as respiration.

In human, the air can be ventilated into the  alveoli of the lung and pulmonary gas exchange occur from the alveoli into the pulmonary capillaries.

Gas transport from the pulmonary capillaries through the circulation to the peripheral capillaries in the organs.

Secondly the breathing where the air inhaled through the nose passes to pharynx, larynx, trachea and into the lungs. The air is exhaled back through the same way.

The exchange of Gases occur between Lungs and Bloodstream, means the inhaled oxygen enter into pulmonary capillaries and bind with hemoglobin and is pumped through the bloodstream.

The carbon dioxide from the blood enters into the alveoli and is expelled out by the process of exhalation.

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Advantages

Chemistry helps you to understand the world around you.

Basic knowledge of chemistry helps you to read and understand product labels.

Chemistry can help you make informed decisions.

Chemistry is at the heart of cooking.

A command of chemistry can help keep you safe!

Disadvantages

It isn't a sustainable form of energy.

It can be expensive.

Some forms of chemical energy are quite rare.

It can produce harmful waste.

It can be used to create devastating weapons.

It offers short-term benefits for long-term consequences.

Answer:A bobcats

Explanation:

Answer:

option A bobcats is correct because fox and bobcats both use to eat small mammals , and that make them to compete

Answer:

the net force is 5. I believe the boat with move to the left due to the increase amount of force the boy is using to push the boat.

Answer:  Protons plus neutrons

Explanation:  Atomic mass of an element is the sum of protons and neitrons.  They are 1 amu (atomic mass unit) each.  Electrons are negligible mass and are left out of the calculation.

The mass number of an atom  is  calculated by adding  proton plus neutrons , therefore option (b) is correct.

An atom’s mass number, also called atomic mass number is the total number of protons and neutrons present in an atomic nucleus.

Protons and neutrons are collectively known as nucleons.

An electron is almost negligible in weight. Thus, the atomic mass of an atom is almost the same as its mass number.

The total number of protons and neutrons present in one atom of an element is known as its mass number.

Mass number = Number of protons + Number of neutrons

The mass number of an atom  is  calculated by adding  proton plus neutrons , hence option (b) is correct.

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Answer:

becoz vvv is always with you

Answer:

Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable