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How can glass be a liquid if it's so hard?

Answer:

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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:

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:

it is number 2

Explanation:

hope this helps it is number 11

Answer:

Mass = 5.33 g

Explanation:

Given data:

Mass of Al = 2.80 g

Mass of Cl₂ = 4.15 g

Theoretical yield of AlCl₃ = ?

Solution:

Chemical equation:

2Al  +  3Cl₂        →       2AlCl₃

Number of moles of Al:

Number of moles = mass/molar mass

Number of moles = 2.80 g/ 27 g/mol

Number of moles = 0.10 mol

Number of moles of Cl₂:

Number of moles = mass/molar mass

Number of moles = 4.15 g/71 g/mol

Number of moles = 0.06 mol

Now we will compare the moles of AlCl₃ with Al and Cl₂.

                    Cl₂           :        AlCl₃

                    3              :          2

                   0.06         :        2/3×0.06 = 0.04

                   Al             :        AlCl₃

                     2            :          2

                   0.10         :        0.10

Number of moles of AlCl₃ produced by chlorine are less so it will be limiting reactant.

Mass of AlCl₃:Theoretical yield

Mass = number of moles ×molar mass

Mass = 0.04 mol × 133.34 g/mol

Mass = 5.33 g

5.33 grams is the theoretical yield of AlCl₃ in this reaction.

Theoretical yield of any reaction tells about the accurate quantity of the product formed by the complete consumption of reactants.

Given chemical reaction is:

2Al + 3Cl₂ → 2AlCl₃

First we convert the mass of reactants into moles by using the formulas:

n = W/M, where

W = given mass

M = molar mass

Given mass of Al = 2.80 g

Moles of Al = 2.80/27 = 0.10 mole

Given mass of Cl₂ = 4.15 g

Moles of Cl₂ = 4.15/71 = 0.06 mole

From this calculation we conclude that Cl₂ is the limiting reagent, so the formation of product depends on Cl₂.

From the stoichiometry of the reaction, it is clear that:

3 moles of Cl₂ = produce 2 moles of AlCl₃

0.06 moles of Cl₂ = produce 2/3×0.06 = 0.04 moles of AlCl₃

Now we calculate the produced mass of AlCl₃ as:

W = 0.04mol × 133.34g/mol = 5.33g

Hence, 5.33g is the produced theoretical yield.

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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:

The number of degrees of longitude that separates New York City from Denver, Colorado is 30.9843 degrees longitude

Explanation:

The longitude of New York City is 74.0060° W

The latitude of New York City is 40.7128° N

The longitude of Denver, Colorado is 104.9903°W

The latitude of Denver Colorado is 39.7392°N

Therefore, the difference the number of degrees of longitude that separates New York City from Denver, Colorado is 104.9903 - 74.0060 = 30.9843°.

Answer:

Once you have identified the limiting reactant, you calculate how much of the other reactant it must have reacted with and subtract from the original amount.

Explanation:

 1.  Write the chemical equation.

   2.Calculate the moles of product from the first reactant.

   3.Calculate the moles of product from the second reactant.

   4.Identify the limiting reactant and the excess reactant.

   5.Calculate the mass of excess reactant used up.

   6.Calculate the mass of unused excess reactant.

   7.Calculate the mass of limiting reactant needed to react with the unused excess reactant.

Answer:

as soon as the pollen reaches the stigma after the pollen grain descends down the style when the pollen tube grows into the ovule when the seed germinates

Explanation:

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:

U

Explanation:

UUUUUUUUUUUUUU

Answer:

silver

Explanation:

The most electrically conductive element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance.

Answer:

A. copper

Explanation:

edge 2021

Answer:

P₂ = 5000 KPa

Explanation:

Given data:

Initial volume = 2.00 L

Initial pressure = 50.0 KPa

Final volume = 20.0 mL (20/1000=0.02 L)

Final pressure = ?

Solution:

The given problem will be solved through the Boly's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

50.0 KPa × 2.00L = P₂ × 0.02 L

P₂ = 100 KPa. L/0.02 L

P₂ = 5000 KPa

Answer: Exosphere

Explanation: Exosphere. This is the outermost layer of the atmosphere. It extends from the top of the thermosphere to 6,200 miles (10,000 km ) above the earth.

the exosphere is the outermost layer of the atmosphere

Answer:

Dipole-dipole forces

Explanation:

A polar compound is that compound which contains atoms that have a difference in charges i.e electrostatic attraction occurs between its constituent atoms. Polar molecules are attracted to other polar molecules with opposite charges and her held together with the aid of certain forces

The attractive force between the negative part of a polar molecule (-) and the positive part of another polar molecule (+) is called DIPOLE-DIPOLE FORCES. This dipole-dipole force gets stronger with an increasing polarity of the molecules involved.

1. ₉¹⁹F

2. Mg(OH)₂

3. 2H₂ + O₂ ⇒ 2H₂O

1. Fluorine, atomic number : 9 , mass number = 19

Symbol : ₉¹⁹F

protons=electrons=atomic number = 9

neutrons = mass number - atomic mass

[tex]\tt n=19-9=10[/tex]

Configuration : [He] 2s² 2p⁵

2. Magnesium hydroxide is an ionic compound and is a strong base consisting of 2 ions:

Positive ion: Magnesium: Mg²⁺

negative ion: Hydroxide: OH⁻

The charges of the two are crossed, so that the compound becomes:

Mg(OH)₂

3. Reaction :

H₂ + O₂ --------> H₂O

give coefficient :

aH₂ + bO₂ --------> H₂O

H, left = 2a, right 2⇒2a=2⇒a=1

O, left = 2b, right 1⇒2b=1⇒b=0.5

Reaction becomes :

H₂ + 0.5O₂ --------> H₂O x 2

2H₂ + O₂ --------> 2H₂O

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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Answer: They Have Waxy Leaves And Stems

Explanation:

:)

Answer:

have waxy leaves and stems

&

produce seeds quickly

Hope this helps good luck :)

Answer:

3 sulphur is more electrically –

Answer:

False

Explanation:

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

Answer: 4) Concentrate it

Explanation:

Answer:a negative charge

Explanation:

while an atom that gains electrons and becomes negatively charged is known as an anion.

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

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:

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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The mass of calcium sulfite produced : 15 g

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.

Reaction

CaO + SO₂ → CaSO₃

mol CaO (MW=56 g/mol)

[tex]\tt \dfrac{7}{56}=0.125[/tex]

Because sulfur dioxide is an excess, so mol CaSO₃ based on mol CaO

From the equation, mol ratio of mol CaSO₃ : mol CaO=1 : 1, so mol CaSO₃ :

[tex]\tt \dfrac{1}{1}\times 0.125=0.125[/tex]

mass CaSO₃ (MW=120 g/mol) :

[tex]\tt 0.125\times 120=15~g[/tex]

Answer:

41.25g

Explanation:

Given parameters:

Half-life of Technetium - 104  = 18minutes

Mass = 165g

Unknown:

Mass of sample remaining after 36minutes = ?

Solution:

The half-life of a radioactive element is the time taken for half of the element to decay;

Now;

                Start           First half life              Second half-life

Time          0                      18min                        36min

 Mass       165g                 82.5g                        41.25g

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