Which of the following represents a chemical change?

Answer:

Therefore 2 mole H2O will have 2.4088×10^24 hydrogen atoms. one mole of water contains 6.02 x 1023 molecules of water. But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.

Answer:

TRUE!!!!!!!!!!

Explanation:

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Answer:

The reactants would appear at a higher energy state than the products.

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Answer:

Explanation:

The electrons revolved around the nucleus, like the rings revolving around Saturn. In 1911, Rutherford showed that Thomson's model was "wrong": the distribution of positive and negative particles was not uniform. Rutherford showed that the atom contains a small, massive, positively charged nucleus.

The Thomson's atomic model is also called the plum pudding model. His atomic model was discarded after the discovery of Rutherford's model of atom.

According to Thomson's atomic model, an atom is considered as a uniform sphere of positive electricity with electrons embedded throughout which gives the most stable arrangement like raisins scattered in a plum pudding.

Rutherford showed that Thomson's model is wrong, because the distribution of positive and negative particles was not uniform. According to Rutherford's model most of the mass and positive charge of an atom is concentrated in a very small region called the nucleus.

The nucleus at the center of atom is surrounded by negatively charged particles which balance the positive charge on the nucleus. Thus the atom as a whole is electrically neutral.

Thus the negative charge is distributed through out the positive charge is the wrong hypothesis of Thomson's model.

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For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.

The term quantum numbers refer to the numbers that describe the position of electron in an atom.

There are four sets of quantum numbers which are;

For the quantum numbers n = 2, ℓ = 1, mℓ = 1, there can be a maximum of two electrons.

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The molality of the sucrose solution is 1.16 m

The molality of a solution is defined as the mole of solute per unit kilogram (Kg) of water. Mathematically, it can be expressed as:

Molality = mole / mass (Kg) of water

Mole = mass / molar mass

Mole of sucrose = 37.4 / 342.2

Mole of sucrose = 0.109 mole

Molality = mole / mass (Kg) of water

Molality of sucrose = 0.109 / 0.0942

Molality of sucrose = 1.16 m

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Answer:

7

Explanation:

7 mol AgCL * [tex]\frac{1 mol AgNO3}{1 mol AgCl}[/tex]

You can cancel out the "mol AgCl" to get 7 moles of AgNO3

Answer:

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

10 mol NH3 ( 6.022 x 10^23 molecules / 1 mol ) = 6.022x10^24 molecules NH3

The aqueous solution of ammonia is weak alkali because ammonia produces OH- ions in it's water solution. - Initially ammonia doesn't have any kind of OH- or hydroxyl ions. Due to the presence of OH- or hydroxyl ions in the solution,the aqueous solution of ammonia is considered as a weak alkali.

Answer:

your answer is

The aqueous solution of ammonia is weak alkali because ammonia produces OH- ions in it's water solution. - Initially ammonia doesn't have any kind of OH- or hydroxyl ions. Due to the presence of OH- or hydroxyl ions in the solution,the aqueous solution of ammonia is considered as a weak alkali.
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Explanation:

~Zayn

Answer:

Color or colour is the visual perceptual property corresponding in humans to the categories called blue, green, red, etc. Color derives from the spectrum of light interacting in the eye with the spectral sensitivities of the light receptors.Explanation:

Answer:

The process of breaking down stones or rocks into small pieces is called weathering.

Explanation:

Explanation:

refer the above attachment

Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.

Types of Mechanical Weathering

Plant Activity. The roots of plants are very strong and can grow into the cracks in existing rocks. ...

Animal Activity. ...

Thermal Expansion. ...

Frost action. ...

Exfoliaton.

Answer:

B: circulatory system

Explanation:

The circulatory system is made up of blood vessels that carry blood away from and towards the heart. Arteries carry blood away from the heart and veins carry blood back to the heart. The circulatory system carries oxygen, nutrients, and hormones to cells, and removes waste products, like carbon dioxide.

Answer:

Circulatory system

Explanation:

pulmonary artery plays a role of transporting oxygen from the lungs back to the heart...

And also most blood vessels transport nutrients to and from the heart

Answer:

300km/h

Explanation:

Speed=distance/time

Speed=600/2

Speed=300km/h

This answer makes sense because if they go 300 in one hour, then 300*2 would get you 600, which is what the question states, 600km.

Live as if you were to die tomorrow. ...

“That which does not kill us makes us stronger.” ...

“Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.” ...

“We must not allow other people's limited perceptions to define us.”

Radium (Ra) is an example of a chemical element which is not abbreviated based on an ancient name.

A chemical element can be defined as a pure substance that comprise atoms with the same atomic number (number of protons) in its atomic nucleus.

In Chemistry, some examples of a chemical element include the following:

Generally, a chemical symbol is typically used in chemistry to abbreviate an atom of a given element or a chemical element. Also, some chemical elements are not abbreviated based on an ancient name such as Radium (Ra).

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Answer:

An important distinction between molality and molarity is the difference between a solution and a solvent. Molarity is the ratio of the moles of a solute to the total liters of a solution. ... Molality, on the other hand, is the ratio of the moles of a solute to the kilograms of a solvent.

Answer:

b)oxygen

Explanation:

all other options are metal

Answer:Copper

Explanation:

Answer:

Heat is being passed; the reaction is exothermic.

Explanation:

Answer:

heat is being passed; the reaction is exothermic

Explanation:

the molecules are moving fast because heat is being passed which means its exothermic

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Answer:

CO2

cardon dioxide is produced

The urban sprawl is common for the economic upward. Thus, option B is correct.

Urban sprawl is defined as the growth of urban areas with the development of housing, shopping centers, etc. The development of the urban area is processed at the undeveloped land.

The urban sprawl results in the development of the urban area on the underdeveloped land, resulting in the disruption of the environment.

However, with the urban sprawl, the opportunities and the facilities for the rural people developed. The economic extension upwards with the growth.

Thus, it has been the reason for supporting urban sprawl. Hence, option B is correct.

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Answer:

2

Explanation:

As only 2 electrons can present in an orbital, so only 2 electrons in an atom can have this set of quantum numbers.

Answer:

Option no 3

Explanation:

Metallic elements aren't usually crumbled in normal air pressure and conditions.

Answer:

Explanation:

d i think but im not sure

Answer:

per-ma-frost

Explanation: I believe this the answer

Answer:

Electrostatic attraction between oppositely charged ions

Explanation:

involve the formation of an octet of electrons in their valence shells, except for hydrogen which needs a duet of electrons

We need balnce equation first

[tex]\\ \tt\bull\rightarrowtail NaCl+AgNO_3\longrightarrow AgCl+NaNO_3[/tex]

Note:-

Excess reagent is always present in reactant side

Answer:

The answer is 576

Explanation:

There is 12 inches in a foot, divide the amount of inches by 12 to get your answer.

6912/12= 576

Answer:

used in irrigation to transfer water over a barrier

Answer:

The 2s and 3p orbitals would have more nodes than 1s and 2p orbitals.

p orbitals would have  same shape, but 3p would be larger

s orbitals would have same shape, but 2s would be larger

Explanation: