What is the frequency of a photon with an energy of 3.38 x 10-19 J?​

Answer:

1.2×10²³ atoms.

Explanation:

Data obtained from the question include:

Mole of propanone = 0.20 mole

Number of atoms of propanone =.?

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.022×10²³ atoms.

This implies that 1 mole of propanone also contains 6.022×10²³ atoms.

Thus, we can obtain the number of atoms in 0.20 mole of propanone as illustrated below:

1 mole of propanone contains 6.022×10²³ atoms.

Therefore, 0.20 mole of propanone will contain = 0.2 × 6.022×10²³ = 1.2×10²³ atoms.

Thus, 0.20 mole of propanone contain

1.2×10²³ atoms.

The total number of atoms in 0.20 mole of propanone is 1.2×10²³, i.e. in given mole 1.2×10²³ atoms of propanone is present.

In one mole of any substance 6.022 × 10²³ atoms of that substance will present, and this number is known by the name of Avogadro's number.

We have given moles of propanone = 0.20 mole

No. of atoms present in 0.20 mole of propanone = 0.20  × 6.022×10²³ = 1.2×10²³.

Hence, 1.2×10²³ atoms are present in given moles.

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Answer:

Lonic.an electron will be transferred from potassium to the chlorine atom

[tex]\huge\boxed{Option C}[/tex]

Ionic bond is a type of bond which is formed between metals and non-metals. The group which provide the Metal are IA and IIA i.e. S block elements. The group which mostly provide non-metal is VII A i.e. halogens. The Metals give up their ONLY Valance shell electron which is accepted by the Non-metal. This results in formation of ions, The Metals gets the positive charge thus called cation and The non-metal gets a negative charge thus called anion. These Positive and Negative ion attract each other resulting in the formation of IONIC BOND.

The Ionic bond is formed between The metal and non metal because, the metals have low ionization energy due to which the valence shell is ejected out easily, and The Non-Metals have high electron affinity which means that  they attract an electron with greater force because they need one electron to complete their octet.

Question has given two atoms Potassium and chlorine. Potassium(Group 1) is metal, Chlorine(Group 7) is non metal. As you can se that there is only one electron in the outer shell of Potassium "K" and Chlorine need only one electron to complete its outer shell so Potassium will give its electron to Chlorine. Due to this reason K will become positive and Cl will become negative and they will both attract eachother forming ionic bond.

So the answer is Option C: Electron will be transferred from the potassium to the chlorine atom.

Answer:physical change

Explanation:

Answer:

Oxidation: A process in which an atom loses an electron and therefore increases its oxidation number. ... So oxidation reactions need not involve oxygen. This redox reaction is actually the sum of two separate half-reactions (a reduction half-reaction and an oxidation half-reaction).

Explanation:

Hope this helped!

Oxygen is not a necessary reactant for oxidation reaction.

In chemistry oxidation is called the chemical phenomenon in which an atom, molecule or ion loses one or more electrons, thus increasing its positive charge.

As oxygen is an element that usually accepts these electrons, this type of reaction was called oxidation reactions.

Therefore, we can conclude that oxygen is not a necessary reactant for oxidation reaction.

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Answer:

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Answer: the answer is biotic because dear are a living factor

Explanation:

Answer:

Explanation:

Given isotope;

            C - 12

Unknown:

Atomic number = ?

Atomic mass  = ?

Solution:

Isotopes of an element have the same electronic configuration but only differ in their masses. They have the same atomic number but different mass numbers due to the differences in the number of neutrons in their various nuclei.

 For carbon; atomic number  = 6

        Atomic mass of this isotope  = 12

The atomic number is the number of protons

Atomic mass is the number of protons and neutrons

Answer: 4) Concentrate it

Explanation:

Answer:

The tempreature???

Explanation:

Colder tempreatures lead to a slower chemical reaction and warmer tempreatures lead to a faster  chemical reaction.

Answer:

If the options are

A. It can push objects apart

B. It can pull objects together

C. It acts between charged particles

D. It acts between objects that do not touch

I'm pretty sure it would be C.

Sry if wrong but have nice day! <3

Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature

Answer:

False

Explanation:

Emectromagnetic waves are slowed down by even the most transparent of mediums.

Because the deep roots of big trees hold the soil and don't let it slip away simply by rain or wind.

Answer:

the roots of the trees keep the soil in place opposed to a barren landscape that has little to no plants to keep the soil in place

hope this helps (╹ڡ╹ )

Answer:

Warm and cold ocean currents can affect the climate of an area along the coast if the winds blow in from the ocean. Warm ocean currents heat the air above the water and carry the warm air to the land, increasing the temperature of the coastal region.

Explanation:

Ocean currents are important to coastal regions for a number of reasons.

Distribute heat. Ocean currents distribute heat around the globe, which helps to moderate the climate in coastal regions. For example, the Gulf Stream brings warm water from the Gulf of Mexico to the coasts of Europe, which helps to keep Europe's climate warmer than it would be otherwise.

Transport nutrients. Ocean currents transport nutrients from the ocean's depths to the surface, which supports marine life. For example, the California Current brings nutrients from the deep ocean to the surface, which supports a rich marine ecosystem off the coast of California.

Diversify marine life. Ocean currents help to diversify marine life by transporting different species to different parts of the ocean. For example, the Kuroshio Current brings warm water from the western Pacific Ocean to the eastern Pacific Ocean, which has helped to diversify the marine life in this region.

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#SPJ6

Answer:

hot

Explanation:

Answer:

The Answer is (Empty)

Answer:

soluble starch, maltose and various dextrins.

Explanation:

To quote the passage: "...a small hot object can have a

higher temperature but less thermal energy than a large cold object."

In other words, a small object can have a high average thermal energy, and therefore a high temperature, but since the object is smaller, the magnitude of thermal energy present in the object is by default less than that in the larger object.  As the passage indicates, every object has thermal energy.  So, despite the fact that the larger object is colder, it still has a greater thermal energy due to the number of molecules that comprise the larger object.

Based on the passage, an object with a lot of thermal energy might be cold but very large.

Answer:

red supergiants is the answer

Answer:

31 N left and 32 N right because

Explanation:

It’s the only one movement because when you subtract them there’s still 1 left

Answer:

Oiling is done on a regular basis to sewing Machine because in the machine there are lots of machinery parts i.e. wheels and axels, etc. which are in continuous use and they possess so much frictional force between them that wear tear may be observed in those parts.

For Frictionless sewing

Answer:

Oxygen needs access to two electrons to reach a full octet. Each calcium atom has two valence electrons that it prefers to lose to obtain a full octet. Therefore, one oxygen atom and one calcium atom complement each other and form an ionic bond.

Explanation:

The bond between oxygen and calcium must be ionic given the fact that the electronegativity difference between them is about 2.44.

Calcium prefers to loose two electrons while oxygen receives these two electrons hence the both atoms attain the octet structure.

Recall that an ionic bond is formed by the loss and gain of electrons by two bonding atoms (complete transfer of electrons). Thus the bond between each calcium and oxygen atom is ionic.

Answer:

3 sulphur is more electrically –

Answer:

Number of neutrons in the nucleus.

Explanation:

Mass number is protons plus neutrons. Protons do not change from isotope to isotope

Answer:

0.375 g/mL

Explanation:

Given data:

Volume occupy by wood = 200 mL

Mass of wood = 75 g

Density of wood = ?

Solution:

Formula:

d = m/v

by putting values,

d = 75 g/ 200 mL

d = 0.375 g/mL

Answer:

There are 11 protons in an atom T.

Explanation:

In chemistry, the scientific word for proton is also known as atomic number so the proton number will be 11.

Answer:

11

Explanation:

Answer:

5

Explanation:

The correct coefficient of oxygen is 5.

The question is incomplete, the complete question is;

Examine the chemical reaction C3H8 + O2---->  4H2O + 3CO2. What coefficient of O2 should be added so the number of atoms of oxygen is conserved on both sides of the reaction equation?

A: 3

B: 5

C: 7

D: 10​

The principle of balancing chemical reaction equation is that the number of atoms of each element at the right hand side of the reaction equation must be equal to the number of atoms of the same element at the left hand side of the reaction equation.

Given the reaction;  C3H8 + O2---->  4H2O + 3CO2, it will only become balanced when the coefficient of O2 is 5.

Hence, we can write; C3H8 + 5O2---->  4H2O + 3CO2

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