0.66y = 0.9x + 0.48 If y has a value of 108.45 what is the value of x?

Answer:

R-O-R is the general formula for Symmetrical Ethers,in which both alkyl groups attached on oxygen are same .

Explanation:

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Answer:

Na₂CO₃.

Explanation:

The compound that has a common ion effect is Na₂CO₃.

Answer:

Na2Co3

Explanation:

Answer:

D. 1 × 10⁻⁴ m

Explanation:

Electromagnetic waves travel through space with the speed of light which is approximately 3.0 ×10⁻⁸ m/s.

The speed is calculated as follows:

c=λf

Where λ is the wavelength of the wave, f the frequency and c the speed of light.

Thus λ=c/f

=(3×10⁸ m/s) / (3×10¹²Hz)

Wavelength, λ= 1 × 10⁻⁴ m

Answer:

D

Explanation:

A.P.E.X.

The oxidation state of Na decreases from 1 to 0 in this reaction Li (s) + NaOH (aq) → LiOH(aq) + Na(s).

Oxidation state is also called Oxidation number is defined as the number assigned to atoms in molecules to represent the general distribution of electrons.

A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.

The given chemical reaction is

Li (s) + NaOH (aq) → LiOH(aq) + Na(s)

The oxidation state of Li is zero in the reactant side. The oxidation state of Na in the reactant side is 1. The oxidation state of Li in the product side is 1. The oxidation state of Na in reactant side is 0.

So the oxidation number of Na decreases from 1 to 0.

Thus from the above conclusion we can ay that The oxidation state of Na decreases from 1 to 0 in this reaction Li (s) + NaOH (aq) → LiOH(aq) + Na(s).

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According to Boyle's law, the temperature would double of a gas if the pressure were halved as the number of moles and the volume were held constant. Hence, option A is correct.

Boyle's law states that at constant temperature, the pressure exerted by a gas is inversely proportional to the volume occupied by it.

If temperature is held constant, the equation is reduced to Boyle's law. Therefore, if you decrease the pressure  (P↓) of a fixed amount of gas, its volume (v ↑) will increase.

(P↓) →  (v ↑)

P∝ [tex]\frac{1}{V}[/tex]

However, if you were to maintain a constant volume while decreasing pressure, the temperature would also have to decrease.

Thus, according to Boyle's law, the temperature would double of a gas if the pressure were halved as the number of moles and the volume were held constant.

Hence, option A is correct.

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They have small differences in electronegativity

i think thats right

Answer:

C.) They have small differences in electronegativity

Answer:

159.7

Explanation:

hope this helps

To determine the leftover reactant in the combustion of 5.00 grams of oxygen and 5.00 grams of CH4, the limiting reagent calculation shows that the leftover reactant is 3.75 grams of methane as oxygen is the limiting reagent.

To determine the amount of the leftover reactant in a combustion reaction involving 5.00 grams of oxygen and 5.00 grams of CH4, we need to conduct a limiting reagent calculation. The balanced chemical equation for the combustion of methane (CH4) is:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)

From the balanced equation, we can see that one mole of CH4 reacts with two moles of O2. The molar mass of CH4 is 16.04 g/mol, and the molar mass of O2 is 32.00 g/mol, so we can use these to convert the mass of each reactant to moles:

Since the reaction requires 2 moles of O2 for each mole of CH4, we can calculate the needed moles of O2 for the reaction with the available CH4:

0.3117 mol CH4 × 2 mol O2 / 1 mol CH4 = 0.6234 mol O2 needed

However, we only have 0.15625 mol of O2 available, which is less than 0.6234 mol. This means O2 is the limiting reagent, and there will be some unreacted CH4 left over. Since all of the oxygen will be used up, we can calculate the leftover mass of methane:

0.15625 mol O2 × 1 mol CH4 / 2 mol O2 = 0.078125 mol CH4 reacted

0.3117 mol CH4 - 0.078125 mol CH4 reacted = 0.233575 mol CH4 unreacted

Finally, we convert the moles of unreacted CH4 back to grams:

0.233575 mol CH4 × 16.04 g/mol = 3.75 grams of CH4

Therefore, the amount of the leftover reactant is 3.75 grams of methane.

Answer:

precess a and b

Explanation:

Answer: I believe the answer is A) Process A and Process C !!!!!!!!

Answer:

= 32.39 %

Explanation:

The relative atomic mass of sodium is 23, sulphur 32 while oxygen as a relative atomic mass of 16.

I mole of Na₂SO₄ has a relative mass of 2(23) + 32 + 4(16) = 142 grams

Of the value 142, the contribution of sodium is 2×23 =46

Thus the % composition is calculated:

46/142×100%= 32.39%  

Answer:

B

Explanation:

Water molecules are good at forming and breaking hydrogen bonds.

The breaking and reforming of hydrogen bonds in liquid water can absorb a large amount of heat, making water resistant to temperature change.

Answer:

Because it does

Explanation:from sun light DUHHHH

Answer:

Explanation:

In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster. ... In liquids, particles are quite close together and move with random motion throughout the container.

Gas particles moving through the air due to random motion is called Brownian motion.

Gas have no definite volume and gases have not a definite shape it can take the shape of container in which it filled. Gases can flow easily. They are highly compressible. They have low density. Gases have very weak intermolecular force and very large intermolecular space.

Brownian motion is also called as Brownian movement is defied as the zig-zag motion of particles suspended in a medium. The gas particles moves randomly in Brownian motion.

Thus from the above conclusion we can say that Gas particles moving through the air due to random motion is called Brownian motion.

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Answer:

Ea = 35 kJ.

Explanation:

Activation energy (Ea) is the difference between the potential energy of intermediate "activated complex/ peak" and reactants.

Ea = P.E. of products - P.E. of reactants = 65 kJ - 30 kJ = 35 kJ.

kindly find the attached image.

Answer:

simple salad

Explanation:

Hi.

Anwers : Vegetable salad.

Achievements.

Answer:

Approximately 1.9 kilograms of this rock.

Explanation:

Relative atomic mass data from a modern periodic table:

To answer this question, start by finding the mass of Pb in each kilogram of this rock.

89% of the rock is [tex]\rm PbS[/tex]. There will be 890 grams of [tex]\rm PbS[/tex] in one kilogram of this rock.

Formula mass of [tex]\rm PbS[/tex]:

[tex]M(\mathrm{PbS}) = 207.2 + 32.06 = 239.26\; g\cdot mol^{-1}[/tex].

How many moles of [tex]\rm PbS[/tex] formula units in that 890 grams of [tex]\rm PbS[/tex]?

[tex]\displaystyle n = \frac{m}{M} = \rm \frac{890}{239.26} = 3.71980\; mol[/tex].

There's one mole of [tex]\rm Pb[/tex] in each mole of [tex]\rm PbS[/tex]. There are thus [tex]\rm 3.71980\; mol[/tex] of [tex]\rm Pb[/tex] in one kilogram of this rock.

What will be the mass of that [tex]\rm 3.71980\; mol[/tex] of [tex]\rm Pb[/tex]?

[tex]m(\mathrm{Pb}) = n(\mathrm{Pb}) \cdot M(\mathrm{Pb}) = \rm 3.71980 \times 207.2 = 770.743\; g = 0.770743\; kg[/tex].

In other words, the [tex]\rm PbS[/tex] in 1 kilogram of this rock contains [tex]\rm 0.770743\; kg[/tex] of lead [tex]\rm Pb[/tex].

How many kilograms of the rock will contain enough [tex]\rm PbS[/tex] to provide 1.5 kilogram of [tex]\rm Pb[/tex]?

[tex]\displaystyle \frac{1.5}{0.770743} \approx \rm 1.9\; kg[/tex].

Answer:

Explanation:

The given pH = 8.55

Unknown:

[H₃O⁺] = ?

[OH⁻] = ?

In order to find these unknowns we must first establish some relationship.

                      pH = -log[H₃O⁺]

                   8.55 = -log[H₃O⁺]

                    [H₃O⁺] = inverse log₁₀(-8.55) = 2.82 x 10⁻⁹moldm⁻³

To find the [OH⁻],

                     pH + pOH = 14

                               pOH = 14 - pH = 14 - 8.55

                                pOH = 5.45

              pOH = -log[OH⁻]

               [OH⁻] = inverse log₁₀ (-5.45) = 3.55 x 10⁻⁶moldm⁻³

The solution is basic because it has more concentration of OH⁻ ions compared to H⁺ ions.

Answer:

[tex]\boxed{ \text{0.75 mol}}[/tex]

Explanation:

(a) Balanced equation

2NaBH₄ + H₂SO₄ ⟶ 2H₂ + Na₂SO₄ + B₂H₆

(b) Calculation

You want to convert moles of NaBH₄ to moles of B₂H₆

The molar ratio is 1 mol B₂H₆:2 mol NaBH₄

[tex]\text{Moles of B$_{2}$H$_{6}$} =\text{1.5 mol NaBH$_{4}$} \times \dfrac{\text{1 mol B$_{2}$H$_{6}$}}{\text{2 mol NaBH$_{4}$}} = \textbf{0.75 mol B$_{2}$H$_{6}$}\\\\\text{The reaction will produce }\boxed{ \textbf{0.75 mol of B$_{2}$H$_{6}$}}[/tex]

Answer:

elta H = Potential Energy of the Products - Potential Energy of the Reactants.  

This would be C-A = delta H  

The activation energy would be B-A  

This is the energy necessary to start the reaction

Answer:

its the relationship between energies and the coeficcients on the graph.

Explanation:

Answer: C. Primary Consumers

Explanation:

Answer:

Primary consumer.

Explanation:

Food chain may be defined as the sequential flow of food energy from one level to the next tropic level. Producers are the first organism that occupies the first tropic level in the food chain.

Producers prepare their food by themselves. Primary consumers get their food by eating directly the producers. Primary consumers are generally feed on the plants and grass.

Thus, the correct answer is option (C).

Answer:

chlorination

Explanation:

Answer: chlorination

Explanation: DDT is made from the

of unsaturated hydrocarbons.

Hello There!

This is called a "Chemical Change"

A chemical change is when the composition of a substance changes. There are many signs of chemical changes. When a chemical change occurs, you can see a change in color. When a new color is visible that means that a new substance has been created. There also is a new smell "odor" this hints that a new substance has been formed.

Answer:

A- Small ice pellets that may fall to the ground in a mixture of rain and snow in the form of a solid

Explanation:

Small ice pellets that may fall to the ground in a mixture of rain and snow in the form of a solid  best describes hail.

Small ice pellets that may fall to the ground in a mixture of rain and snow in the form of a solid describe Hail.

Hail is a form of precipitation, or water that can easily fall to the ground from the atmosphere. Hail is former when water droplets freeze together in the clouds. The ice that formed are called hailstones.

Hailstones length is between 5 millimeters and 15 centimeters

Therefore, Small ice pellets that may fall to the ground in a mixture of rain and snow in the form of a solid describe Hail.

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Answer:

cell wall

chloroplasts

central vacuole

Explanation:

Plant cells have a cell wall, chloroplasts, and a central vacuole. These structures are not found in animal cells.

The structures of three cells present in the cells in plant, but not animal cell are Cell wall, Chloroplast and Plastids.

Animal cell only contain cell membrane whereas plant cell has both cell wall and cell membrane. Unlike animal cell, plant cell makes their own food. The plants come under autotrophs and animals come under heterotrophs.

For this purpose, there is chloroplast in a plant cell. The major function of chloroplast is to produce food through photosynthesis. Plastids are the pigment containing cell organelles which is responsible for the color of plant cell.

Answer:

Explanation:

Group           Most Likely Ionic Charge               Number of Valence Electrons

   I                                 +1                                                           1

   II                                 +2                                                         2

   III                                +3                                                          3

   IV                           +4 or -4                                                     4

   V                                  -3                                                         5

   VI                                 -2                                                         6

  VII                                 -1                                                          7

  VIII                                 0                                                          8

For elements in group IV and above, their ionic charge is (8-number of their valence electrons.)

Explanation:

Valence electrons are defined as the electrons which are present in the outermost shell of an atom.

The number of valence electrons in a particular group will be equal to the group number.

Number of valence electrons = Group number

The given table follows:

Group       Most likely ionic charge      No. of valence electrons

   I                                  +1                                            1

  II                                 +2                                            2

 III                                 +3                                            3

 IV                             +4 or -4                                       4

  V                                -3                                              5

 VI                                -2                                              6

 VII                                -1                                              7

VIII                                 0                                             8

Answer:

prophase I

Explanation:

Homologous chromosomes pair up during prophase I of meiosis.

Explanation:

Nuclear reactions are defined as the reaction in which there occurs change in the nucleus of an atom due to change in number of protons or neutrons of an atom.

For example, [tex]^{2}_{1}H + ^{2}_{1} \rightarrow ^{4}_{2}He[/tex] is a nuclear reaction.

Hence, identity of the element changes in a nuclear reaction. Also, nuclear reaction can occur at varied rates as they are not affected by temperature, pressure or catalyst.

Whereas a chemical reaction is defined as the reaction where there occurs exchange of electrons between the combining atoms.

For example, [tex]2Na(s) + Cl_{2}(g) \rightarrow 2NaCl[/tex] is a chemical change.

Thus, we can conclude that nuclear reactions are different from chemical reactions as follows.

Answer:

80.04 gram

Explanation:

mass = moles × relative formula mass

= 0.58×138

= 80.04

Answer:

4 significant figures as zeros after decimal should not be counted

Explanation:

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Answer:

4 significant figures

Answer:

restrict population growth ( second choice).