120 g of KI at 0 °C solution is
​

Answer:

There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.

Explanation:

There are a total of 56 ethnic groups in China, with 56 ethnic groups and 56 family members.

Answer:

4C2H5NH2(g) + 15O2(g) →  8CO2(g) + 14H2O(g) + 2N2(g)

Explanation:

The balanced chemical equation  for the given chemical reaction is 4 C₂H₅NH₂(g) + 15 O₂(g) →  8 CO₂(g) + 14 H₂O(g) + 2 N₂(g).

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

Learn more about chemical equation,here:

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Answer:

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CONTENTS

PHYSICAL GEOLOGY

Chapter 2 Minerals

2.1 Electrons, Protons, Neutrons, and Atoms

All matter, including mineral crystals, is made up of atoms, and all atoms are made up of three main particles: protons, neutrons, and electrons. As summarized in Table 2.1, protons are positively charged, neutrons are uncharged and electrons are negatively charged. The negative charge of one electron balances the positive charge of one proton. Both protons and neutrons have a mass of 1, while electrons have almost no mass.

Table 2.1 Charges and masses of the particles within atoms

Elementary Particle Charge Mass

Proton +1 1

Neutron 0 1

Electron −1 ~0

The element hydrogen has the simplest atoms, each with just one proton and one electron. The proton forms the nucleus, while the electron orbits around it. All other elements have neutrons as well as protons in their nucleus, such as helium, which is depicted in Figure 2.2. The positively charged protons tend to repel each other, and the neutrons help to hold the nucleus together. The number of protons is the atomic number, and the number of protons plus neutrons is the atomic mass. For hydrogen, the atomic mass is 1 because there is one proton and no neutrons. For helium, it is 4: two protons and two neutrons.

For most of the 16 lightest elements (up to oxygen) the number of neutrons is equal to the number of protons. For most of the remaining elements, there are more neutrons than protons, because extra neutrons are needed to keep the nucleus together by overcoming the mutual repulsion of the increasing numbers of protons concentrated in a very small space. For example, silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28. The most common isotope of uranium has 92 protons and 146 neutrons. Its atomic number is 92 and its atomic mass is 238 (92 + 146).

helium atom

Figure 2.2 A depiction of a helium atom.

The dot in the middle is the nucleus, and the surrounding cloud represents where the two electrons might be at any time. The darker the shade, the more likely that an electron will be there. An angstrom (Å) is 10-10m . A femtometre (fm) is 10-15m. In other words, a helium atom’s electron cloud is about 100,000 times bigger than its nucleus.

Electrons orbiting around the nucleus of an atom are arranged in shells — also known as “energy levels.” The first shell can hold only two electrons, while the next shell holds up to eight electrons. Subsequent shells can hold more electrons, but the outermost shell of any atom holds no more than eight electrons. The electrons in the outermost shell play an important role in bonding between atoms. Elements that have a full outer shell are inert in that they do not react with other elements to form compounds. They all appear in the far-right column of the periodic table: helium, neon, argon, etc. For elements that do not have a full outer shell, the outermost electrons can interact with the outermost electrons of nearby atoms to create chemical bonds. The electron shell configurations for 29 of the first 36 elements are listed in Table 2.2.

Answer:

41.184 pounds

Explanation:

Calculate the total grams first.

180 x 104 = 18,720 grams

Convert that into kilograms (kg)

18,720g         1 kg

------------ X  -------------  = 18.720 kg

     1              1000 g

Convert kilograms into pounds.

18.729 kg         2.2 lb

---------------  X  -----------   =  41.184 lb  (pounds)

       1                 1 kg

Answer:

I think it's A and C. Please tell me if I am wrong.

Explanation:

Answer:

Alright so I did this quiz a while ago it's A and C now could i have brainliest?

Explanation:

Answer:

It's false. We can not alter the formula of the substance involved in a chemical reaction.

Molarity as Stoikiometri

Equatuions od Molarity :

M = m/Mr × 1000/V

Mr Lithium Dichromate (Li2CrO4)

= Ar Li (2) + Ar Cr + Ar O (4)

= 7 (2) + 52 + 16 (4)

= 14 + 52 + 64

= 130 g/mol

Molarity

= m/Mr × 1000/V

= 19.5 g/130 g/mol × 1000/95 mL

= 0.15 mol × 10.53 /L

= 1.5795 mol/L

So, the molarity of the solution is 1.5795 mol/L

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Answer:

B. A compound

Explanation:

An ion is defined as a charged particle, so it's not going to be that. Ions can be positively or negatively charged.

Electrons are tiny particles, smaller than an atom, that revolve around the nucleus. They have a negative charge. So they are not neutral either

Protons are also a part of atoms, like electrons are. An atom is neutral overall. This is because protons have a positive charge that balances out the negative charge of electrons.

So, the only answer option we have left is for a compound. So, that's our answer!

Answer:

c. an electron

Explanation:

A neutral charge is the electrochemical occurrence where an atom has an equal number of electrons and protons. Such an atom is neither positively charged nor negatively charged because the protons and electrons balance each other out

Explanation:

New kinetic energy= ½mv'²

v' =4m/s

m= 2000kg

KE = ½ (2000) (4)²

=16000 Joules

Answer:

I believe it is D sorry if I am wrong

Explanation:

Answer:

D.

Explanation:

Answer:

The Answer is B.

Explanation:

I love your name and pfp its awesome!

~Hope this helps!

Answer:

It reflects the amount of force an object exerts. It states that every object attracts another object.

Answer:

7.96 x 10^-22 J

Explanation:

Answer:

8 electróns

Explanation:

because the Last protons

Answer:

An isotope is one of two or more forms of the same chemical element. Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Explanation:

I hope you have a nice day and please mark me(:

Answer: Elements are simply what you see on the periodic table. E.g. carbon, oxygen, hydrogen etc. Isotopes are elements with different masses. ... So isotopes have the same amount of protons but with different amounts of neutrons.

Explanation: plz mark brainliest!

Answer:

44   98  

Explanation:

Carbon Dioxide (CO2) - Has 1 carbon and 2 oxygens,

C=12 O=16,

Relative atomic mass(Ar) = 12 + (16 x 2),

Relative formula mass(Mr)= 44

Sulphuric Acid (H2SO4) - Has 2 hydrogens, 1 sulphur and 4 oxygens,

H=1 S=32 O=16,

Relative atomic mass(Ar) = (1 x 2) + 32 + (16 x 4)

Relative formula mass(Mr)= 98

Answer:

Physical

Explanation:

Nothing has chemically happened and the change is permenant therefore it is physical

3d < 4s  is NOT a correct ordering of subshells in the periodic table because 4s is at a lower energy level than 3d.

According to the Aufbau principle,   The electron configuration of an element tells how electrons of that element are arranged in thier subshells from their lowest energy state before the highest energy state.

For example, before a 2s subshell can be occupied, A 1s subshell must be filled.

The orbitals are filled in this order:

1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s,

For example, Na (sodium) with 11 atomic number is written as 1s2 2s2 2p6 3s1

Therefore,

2p < 3s   True

3d < 4p   True

3d < 4s     False

4s < 4p   True

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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\[/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

[tex]n = \frac{5.65 \times {10}^{26} }{6.02 \times {10}^{23} } \\ = 938.5382[/tex]

We have the final answer as

Hope this helps you

Answer:

helloo!!!!!!! I am 12 :)

Answer:

Filtration is the removal or filtering of the toxins and waste products from the blood by the kidney. They are excreted from the body through urine. In general, filtration refers to the passing of a liquid through a filter. In the human body, the kidney functions as a filter.

Explanation:

Answer:

if you subtract 88 from 226 you get 138

so uour answer would be C.

Answer:

138

the conversion of an atom of one element into a different element through nuclear changes

A nuclear equation is balanced according to mass number. A chemical equation is balanced according to the total mass before and after the change

82

Some of the matter is converted to energy

Explanation:

I've used this website enough I think its time for me to give back.

If you are talking about an atom with a full octet, then it would just have a full shell of 8 valence electrons.

Answer:

valence

Explanation:

the hydrogen moves to an excited state and electrons will move to higher energy levels

Answer:

12 protons, 12 neutrons and 10 electron

Answer:  See below

Explanation:  a.  The mass of an element is composed of:

protons:     1 amu each

neutrons:   1 amu each

electrons:   0 amu each

Only the protons and neutrons are counted in the atomic mass of an element

b.  Electrons are assigned a mass of 0.  They do have a mass, but it is exceedingly small compared to the protons and neutrons, so they are left out of the calculation of an element's mass.

c.  An element becomes unstable if the neutrons exceed the protons by a certain ratio, dependent on the element.

Answer:

[tex]1m ^ {3}[/tex]

Explanation:

UwU