Explain specifically how an electron gives off light in an atom.

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Answer:

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A chemical reaction is when reactants are converted into another substance (also called products). Their reaction rearranges the constituent atoms of the reactants to give different substances as products.

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Answer:c

Explanation: atoms make matter

Atoms are the basic building blocks of matter. The correct option is C.

Atoms are the basic unit and building block of matter. They are the smallest unit, but they can be divided. They do not emit charge on dividing into the further, the smallest parts.

Atoms are further divided into electrons, protons, and neutrons. They are the charged particles that revolve in the shell of the atom. A nucleus is also present in the between of the atom.

Atoms are considered the building blocks of matter, as all matter is made up of many atoms. The configuration of the atom defines the state of matter.

Thus, the correct option is C. The basic building blocks of matter.

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Answer:

An ice cube melting is a physical change because melting doesn't change the composition of the element. Paper burning is a chemical change because combustion occurs. Bubbles forming in a soda does involve chemical changes. Hard-boiling an egg is a chemical change because the egg's composition changed.

Answer:

Enter your numerical answer to 1 decimal place. Do not include the units of "g". Question: Question 14 1 pts Consider the following reaction, where A and E are hypothetical elements. A+3E --> AE The atomic mass of A is 42.1 amu. The atomic mass of Eis 56.2 amu. If 42.6 g of A fully reacts, how many grams of AE, are expected to form?

Answer:

474. 64 mm Hg

Explanation:

using Boyle's Law that is

P1. V1 = P2. V2

655 × 10 = P2 × 13. 8

[tex]P2 = \frac{655 \times 10}{13.8} [/tex]

P2 = 474. 64 mm Hg

Answer:

Organ System

Explanation:

These organs are helping each other process food and therefore be an Organ System

Answer:

Explanation:

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Answer:

1. False

2. True

3. False

4. False

5. True

6. False

7. True

8. True

9. True

Answer:

It is called standard solution.

Explanation:

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Answer:

E....H+

Explanation:

coz when hydrogen ions are formed they automatically join to form hydrogen

Answer:

How many distinct monochlorinated products can result when methylcyclohexane is subjected to free radical chlorination under UV light.

Explanation:

Consider 1-methylcyclohexane:

Its structure is shown below:

It has primary [tex]1^o[/tex], secondary [tex]2^o[/tex]and tertiary [tex]3^o[/tex] carbons as shown in the image.

So, the following mono chlorinated product will be formed.

Sodium has a mass number of 23amu. Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Answer:

Chloroplasts?

Explanation:

Hi there!

[tex]\large\boxed{3.203 * 10^{22} atoms}[/tex]

We can use the following conversions to solve:

Total mass --> amount of mols --> amount of atoms (Avogadro's number)

Begin by calculating the amount of boron trifluoride in 3.61 grams:

3.61 g * (1 mol BF₃ / 67.8 g) ≈ 0.0532 mol BF₃

Use avogadro's number to convert:

0.0532 mol * 6.02× 10²³atoms / 1 mol = 3.203 × 10²² atoms

Answer:

global warming

Explanation:

Applying smart electric grid technologies can potentially reduce CO2 emissions.

Answer: The heat energy produced is 53831.25KJ

Explanation:

METHANE is the main component of natural gas. It can undergo combustion reaction in air with a bright blue flame to produce carbondioxide and water. The heat of reaction (enthalpy) is negative because heat is absorbed during the chemical reaction. To calculate the heat energy produced by the combustion of one kilogram (1 kg) of methane the following steps are taken:

Molecular mass of methane =16 gm/mol.

So moles of 1 kg methane =

Given mass of methane ÷ molecular weight of methane

But the given mass = 1kg = 1000g

Therefore,

moles of 1000g methane = 1000÷16

= 62.5 moles

Hence, energy evolved = (moles of methane) × (heat of combustion)

Therefore,

heat energy produced= 62.5 × (-861.3kj)

= -53831.25kj

​

The heat energy produced by the combustion of one kilogram of methane is –53831.25 KJ

We'll begin by calculating the number of mole in 1 Kg of CH₄

Mass of CH₄ = 1 kg = 1000 g

Molar mass of CH₄ = 12 + (4×1) = 16 g/mol

Mole = mass /molar mass

Mole of CH₄ = 1000 / 16

CH₄ + 2O₂ —> CO₂ + 2H₂O ΔH = –861.3 KJ

From the balanced equation above,

1 mole of CH₄ reacted to produce –861.3 KJ.

Therefore,

62.5 moles of CH₄ will react to produce = 62.5 × –861.3 = –53831.25 KJ

Thus, –53831.25 KJ of heat energy is produced.

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Answer:

wavelength

Explanation:

Answer:

in order of their atomic mass

The first periodic table created by Mendeleev was based on the atomic masses of elements. Later Mosely modified it based on the atomic number.

Periodic table is the classification of all the known  elements based on their atomic number. There are 118 elements in periodic table now. They are classified into different groups and periods.

Mendeleev was first to create periodic table for the easy classification of elements. He classified elements based on their atomic masses. At that time there were only 60-65 elements discovered.

Later Mosley modified it to modern periodic table based on the increasing order of atomic number of elements. Therefore, the first arrangement was based on atomic masses.

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Answer:

1.5057×10^22 atom

Explanation:

As we

1 mole of argon = 40 g of argon

i.e 40 g of argon = 1 mole of argon

1 g of argon = 1/40 mole of argon

1 mole of argon = 6.023×10^23 atom of argon

1/40 mole if argon = 1/40 ×6.023×10^23

= 1.5057×10^22

The number of atoms of Argon in 1 g would be 1.51 × 10²²

To find out the number of atoms of Argon in 1 g of Argon, the number of moles has to be calculated from which the number of atoms can be derived.

The molecular mass of Argon is 40. The number of moles of Argon is calculated as:

Number of moles of Argon = [tex]\frac{Mass of Argon in grams}{Molecular mass of Argon}[/tex]

Substituting molecular mass as 40 and mass in grams as 1. we get:

Number of moles of Argon = [tex]\frac{1}{40}[/tex] = 0.025 mol

Number of atoms in 1 mole of any substance is given by Avogadro's number as 6.022 × 10²³.

Thus, number of atoms of Argon in 0.025 moles would be

= 0.025 × 6.022 × 10²³

= 0.151 × 10²³ or 1.51 × 10²²

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Answer: The molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.

Explanation:

Given: Mass = 198 g

Volume = 2.0 L

Molarity is the number of moles of solute present in liter of a solution.

Moles is the mass of a substance divided by its molar mass. So, moles of barium iodide (molar mass = 391.136 g/mol) is calculated as follows.

[tex]Moles = \frac{mass}{molar mass}\\= \frac{198 g}{391.136 g/mol}\\= 0.506 mol[/tex]

Now, molarity is calculated as follows.

[tex]Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.506 mol}{2.0 L}\\= 0.253 M[/tex]

Thus, we can conclude that the molarity of 198 g of barium iodide [tex](BaI_{2})[/tex] in 2.0 L of solution is 0.253 M.

Answer:

Hope that will help you

Explanation:

Text me for more answers

Answer:

overall I think one answer

Answer:

True

Explanation:

The answer is True...

Answer:

i think true

Explanation:

if right than tag me brilliant

What is a polyatomic compound?

➡A polyatomic ion is an ion that contains more than one atom. This differentiates polyatomic ions from monatomic ions, which contain only one atom.

Answer:

4.. increases

5..lowers

6.. increases

7.. increases

8.. speed

Answer:

When a substance is heated, its temperature rises because its molecules move faster and gain thermal energy. Temperature measures the "hotness" or "coldness" of an object. The term heat refers to thermal energy being transferred from a hotter system to a cooler one.

Answer:

C. T>617 K

Explanation:

We are given that

[tex]\Delta H=176KJ/mol[/tex]

[tex]\Delta S=0.285KJ/K\cdot mol[/tex]

We have to find the temperature at which the reaction is spontaneous.

When

[tex]\Delta H>0, \Delta S>0[/tex]

Therefore, the reaction is spontaneous at certain range of temperature.

Option A is not true.

[tex]\Delta G=\Delta H-T\Delta S[/tex]

When [tex]\Delta G[/tex] is negative, then  the reaction is spontaneous.

[tex]\Delta G=176-0.285T[/tex]

When T<50

Suppose T=49 K

[tex]\Delta G=176-49\times 0.285>0[/tex]

Therefore, [tex]\Delta G is positive[/tex].Hence, the  reaction is not spontaneous.

Option B is wrong.

C.T>617K

Suppose T=618 K

[tex]\Delta G=176-0.285\times 618=-0.13<0[/tex]

Therefore, [tex]\Delta G is negative[/tex].Hence, the  reaction is spontaneous.

So, option C is true.

D.T<617 K

Suppose T=616 K

[tex]\Delta G=176-0.285\times 616=0.44>0[/tex]

Therefore, [tex]\Delta G is positive[/tex].Hence, the  reaction is not spontaneous.

So, option D is not true.

Answer:

it is option (d)

it has more mass than any of the other planets of the inner solar system