chemical equation for dehydration reaction conducted: calculations: (neatly show all calculations, including all units; for more space use back of paper) molar mass of water: molar mass of the anhydrate: mass percent water in hydrate:

Answer:

1s22s22p6

Explanation:

Neon is an element in the periodic table and has an atomic number of 10, which means it has 10 protons in its nucleus and thus since the number of protons and electrons is the same then it has 10 electrons.

Therefore, it has 2 electrons in the first energy shell and 8 electrons in the second energy shell. To elaborate further, the first shell has a single s-sub shell that contains a single s-orbital that can hold two electrons. The second energy shell has a single s-sub-shell whose s-orbital will occupy 2 electrons, and also has a p-orbital which can hold 6 electrons, making the second shell to have 8 electrons.

The balanced redox equation is \(2MnO_2 + 4Ag+ + 4H+\) → \(2MnO^{-4} + 4Ag + 2H_2O.\)

A balanced redox reaction refers to a chemical reaction that involves oxidation and reduction and has balanced charges and atoms on both sides of the reaction equation.

In a balanced redox reaction, the oxidation and reduction reactions take place simultaneously, with the oxidation of the reducing agent leading to the reduction of the oxidizing agent, hence balancing the electrons and charges on both sides of the equation.

The balanced redox reaction of \(MnO_2+Ag^+\)⟶\(MnO^{-4}+Ag+\) is as follows:

\(2MnO_2 + 4Ag+ + 4H+\) → \(2MnO^{-4} + 4Ag + 2H_2O\)

The reaction involves the oxidation of \(MnO_2\)to \(MnO^{-4}\)and the reduction of Ag+ to Ag. The\(MnO_2\) acts as the reducing agent while Ag+ acts as the oxidizing agent. The reaction takes place in an acidic medium with H+ ions.

The electrons involved in the reduction and oxidation reactions are balanced, and the charges on both sides of the equation are equal.

In summary, the balanced redox reaction of \(MnO_2+Ag+\)⟶\(MnO^{-4}+Ag+\) is a chemical reaction that involves oxidation and reduction of the reactants to produce products that have equal charges and atoms on both sides of the equation.

The balanced redox equation is  \(2MnO_2 + 4Ag+ + 4H+\)→ \(2MnO^{-4} + 4Ag + 2H_2O.\)

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you can use this method to balance any equation,

write you elements down , then start balancing them one after the other,

starting from metals , to non metals

it's better to balance hydrogen and oxygen the last and in most cases , they are automatically balanced

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The empirical formula of polyethylene can be determined by converting the given percentages of carbon (C) and hydrogen (H) into grams. To find the grams of each element, we assume a 100.0 g sample of polyethylene.

For carbon:

Mass of carbon = 86.0% × 100.0 g = 86.0 g

For hydrogen:

Mass of hydrogen = 14.0% × 100.0 g = 14.0 g

Therefore, in a 100.0 g sample of polyethylene, there are 86.0 grams of carbon and 14.0 grams of hydrogen.

The empirical formula of a compound represents the simplest whole-number ratio of atoms present in the compound. To determine the empirical formula, we need to find the ratio of carbon to hydrogen in terms of moles.

First, we convert the masses of carbon and hydrogen into moles using their respective molar masses. The molar mass of carbon is approximately 12.01 g/mol, and the molar mass of hydrogen is approximately 1.008 g/mol.

Number of moles of carbon = 86.0 g / 12.01 g/mol ≈ 7.162 mol

Number of moles of hydrogen = 14.0 g / 1.008 g/mol ≈ 13.89 mol

Next, we divide the number of moles of each element by the smallest number of moles to get a simplified ratio.

Carbon: Hydrogen ≈ 7.162 mol : 13.89 mol ≈ 1 : 1.939

Since we want to express the ratio in whole numbers, we multiply both sides by 2 to get a whole number ratio.

Carbon: Hydrogen ≈ 2 : 3.878

Rounding to the nearest whole number, we find that the empirical formula of polyethylene is CH₂.

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There are natural forces such as the one between two surfaces that rub, called friction. Another force is gravity, that pulls us to the center of the Earth.

Many forces can be found acting on the same object. When two forces act in the same direction, we sum the forces to find net force the force. This causes friction the forces are in the movement of the object. speed up, slow down, change direction or

19. An inclined plane is often called a ramp - It is a flat surface.

Force is defined as the product of mass and acceleration. It is a derived quantity and measured in Newtons ( N ). This goes to say that the S.I unit of force is Newton. However, foce is also measured in kilograms per meters squared.

There are two major types of force, there are:

In conclusion, we can now confirm from the explanation given above that force is obtained from the combination of fundamental quantities.

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1. Earthquakes and Eruptions (volcanoes)

2. Divergent plate boundary

3. Apart from a widening valley, it equally contributes to steep mountain sides spreading. A mid-oceanic ridge is naturally produced if two oceanic plates naturally start moving away from each other.

1. When a divergent boundary occurs beneath oceanic lithosphere, the rising convection current below lifts the lithosphere, producing a mid-ocean ridge. Extensional forces stretch the lithosphere and produce a deep fissure. When the fissure opens, pressure is reduced on the super-heated mantle material below. It responds by melting, and the new magma flows into the fissure. The magma then solidifies and the process repeats itself.

2. When two plate diverge from each other also known as divergent (di-apart, vergere- to inclined) plate margin .

Two plate diverge along oceanic ridges where new lithosphere is created.

Now come to the main point: Geological Features

When two oceanic plate diverge then new sea floor is created by a process called sea floor spreading and features like Mid oceanic ridges, volcanoes & Young lava flows forms. Ex. East Pacific Rise, Mid-Adlantic Ridge.

When two continental plates diverge by continental rifting then features like Rift valley, volcanoes are found. Ex of continent continent -East Africa rift vally, Red sea.

3. The major difference between different types is what type of plate the divergent boundary is between. If the boundary is found between two continental plates you are left with a rift valley. ... If two oceanic plates begin moving away from each other it creates a mid-oceanic ridge.

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The concept VSEPR theory is mainly based on the arrangement of electron groups. This theory is generally used to predict the geometry of the molecules.

The Valence shell electron pair repulsion theory is based on the assumption that valence shell electron pairs repel each other and are oriented in space as far apart as possible to minimize mutual repulsion.

Each group around the central atom is designated as a bonding pair or non-bonding pair. For example BeF₂ is a two electron group in which the number of bond pairs on the central 'Be' atom is two.

Similarly the molecule BCl₃ is a three electron group, the number of electron pairs on the 'Be' atom is 3.

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Answer:

Below

Explanation:

2HCl + K2CO3 -> 2KCl + CO2 + H2O

The Brnsted-Lowry acid-base hypothesis states that when a molecule gives a proton (H+ ion) to another molecule, it behaves as an acid. As a result, the right response is (3) donates an H+.

The Arrhenius theory states that acid is a chemical that causes water to create hydrogen ions. Base is a chemical that causes water to form hydroxide ions.

A neutralisation reaction takes place during the acid-base titration. Here, the concentration of a particular base or acid is ascertained by neutralisation against an acid or base of known concentration. This kind of titration begins with a drop of an indicator, which changes colour to show the endpoint.

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To solve this problem, we can use the combined gas law, which states that the ratio of initial pressure, volume, and temperature is equal to the ratio of final pressure, volume, and temperature. The formula is as follows:

(P₁ * V₁) / T₁ = (P₂ * V₂) / T₂

Given:

Initial volume (V₁) = 447 mL

Initial temperature (T₁) = 106 ºC

Final volume (V₂) = 227 mL

We need to find the final temperature (T₂). Let's assume the initial and final pressures are constant, so we can ignore them.

Now, we can plug in the values into the formula:

(447 mL * T₂) / (106 ºC) = (227 mL * T₁) / (106 ºC)

Simplifying the equation:

447 mL * T₂ = 227 mL * 106 ºC

T₂ = (227 mL * 106 ºC) / 447 mL

T₂ ≈ 54 ºC

Therefore, the final temperature of the gas is approximately 54 ºC.

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Answer:

Left over mass of hydrogen = 0.06 g

Mass of HCl produced = 12.41 g

Explanation:

Given data:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Solution:

Chemical equation:

H₂ + Cl₂    →     2HCl

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

Now we will compare the moles of HCl with H₂ and Cl₂.

                     H₂             :            HCl

                      1               :               2

                   0.2              :           2×0.2 = 0.4

                     Cl₂             :             HCl

                      1               :              2

                    0.17           :            2 × 0.17 = 0.34

Chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:

                          Cl₂               :               H₂

                            1                :                 1

                           0.17            :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

Mass = number of moles × molar mass

Mass = 0.03 mol × 2 g/mol

Mass = 0.06 g

The sum of the mass of HCl produced plus the mass of left over reactants is:

Mass of hydrogen = 0.06 g

Mass of HCl  = 12.41 g

Given:

Mass of H₂ = 0.40 g

Mass of Cl₂ = 12.35 g

Mass of left over reactant = ?

Mass of HCl produced = ?

Number of moles of H₂:

Number of moles = mass / molar mass

Number of moles = 0.40 g/ 2 g/mol

Number of moles = 0.2 mol

Number of moles of Cl₂:

Number of moles = mass / molar mass

Number of moles = 12.35 g/ 71 g/mol

Number of moles = 0.17 mol

The moles of HCl with H₂ and Cl₂.                

  H₂             :            HCl              

     1              :               2          

     0.2          :           2×0.2 = 0.4                

    Cl₂             :             HCl            

        1             :              2          

       0.17         :          2 × 0.17 = 0.34

The chlorine is limiting reactant.

Mass of HCl produced:

Mass = number of moles × molar mass

Mass = 0.34 mol × 36.5 g/mol

Mass = 12.41 g

Leftover mass of hydrogen:                

         Cl₂               :               H₂            

              1             :                 1          

               0.17       :             0.17

Number of moles of H₂ react with Cl₂  are 0.17.

Moles remain unreacted = 0.2 - 0.17 = 0.03 mol

Mass left over:

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Answer:

70.9 grams 3 sig figs

Explanation:

24.1% of 294 grams = 0.241(294 gram) = 70.854 grams ≅ 70.9 grams 3 sig figs

Answer:

0.005712

Explanation:

5.712 grams = 0.005712 kilograms

Answer:

It would be 0.005712

Explanation:

Answer:

c. H2(g) + CuO(s) → Cu(s) + H2O(l)

e. H2(g) + Cl2(g) → 2HCl(g)

Explanation:

A redox reaction is a reaction that involves a changes in oxidation number of the species involved in the reaction.

The oxidizing agent experiences a decrease in oxidation number while the reducing agent experiences an increase in oxidation number.

For H2(g) + CuO(s) → Cu(s) + H2O(l)

Copper is reduced from +2 to 0 while hydrogen is oxidized from 0 to +2 Hence hydrogen is the reducing agent while copper is the oxidizing agent.

For H2(g) + Cl2(g) → 2HCl(g)

Chlorine is reduced from 0 to -1 while hydrogen is oxidized from 0 to +1. Hence chlorine is the oxidizing agent while hydrogen is the reducing agent.

Answer:

Im gonna say its b

Explanation:

b

In an ecosystem, as pollinators bees pollinate plant species that produce food.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.There are different ecosystems present.

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Answer:

Flask A

Explanation:

Cause it has high gas temperature

Answer:

plum pudding model .

Explanation:

the electrons were 'like plums embedded in a pudding'. Also called the Raisin Bread Model.

Empirical formula of Carbon dioxide :

Answer:

The concentration would be 0.76 mol/L.

The most common way to solve this problem is to use the formula

c1V1=c2V2

In your problem,

c1 = 4.2 mol/L; V1 = 45.0 mL

c2 = ?; V2 = 250 mL

c2=c1×V1V2 = 4.2 mol/L × 45.0mL250mL = 0.76 mol/L

This makes sense. You are increasing the volume by a factor of about 6, so the concentration should be about ¹/₆ of the original (¹/₆ × 4.2 = 0.7).

Explanation:

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Answer:

Option D

Explanation:

The switch safely opens and closes the circuit

The order of increasing ionic property is;

WO3 < ZrS2 < MnS2< ZnS < MnS

Ionic compounds are compounds that contain an ion pair. Typically, ionic compounds are formed between metals and nonmetals.

The degree of ionic character depends on the type of metal involved and the magnitude of charge it carries.

Typically, first row transition metals form ionic compounds. The degree of ionic character depends on the row in which the metal is found and the magnitude of charge it carries.

Hence, the order of ionic character of the compounds from most ionic to least Ionic is; WO3 < ZrS2 < MnS2< ZnS < MnS.

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Answer:

\(Cl_2\) is the limiting reactant

Explanation:

To identify the limiting reactant, we can calculate the number of moles of each reactant and divide it by its stoichiometric coefficient. By doing this, we will obtain the mole ratio of reactants required by the chemical reaction. The reactant with the smallest mole ratio will be the limiting reactant.

So the number of moles for each reactant:

Number of moles of Al (Molar Mass = 27 g/mol) = 34/27 = 1.26 moles

Number of moles of \(Cl_2\) (Molar mass = 71 g/mol)= 39/71 = 0.55 moles

Then, we divide these numbers over their stoichiometric coefficient:

For Al = 1.26/2 = 0.63

For \(Cl_2\) = 0.55/3 = 0.18

Then, Cl2 is the limiting reactant

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Answer:

B Layer Z, deep in the earth

Explanation:

Fossils are found almost exclusively in sedimentary rocks-rocks that form when sand, silt, mud, and organic material settle out of water or air to form layers that are then compacted into rock.

Because the speed limit sign is in kilometres per hour and the driver is accustomed to miles per hour, no other cars are passing too quickly. The permitted speed is roughly 62 mph.

A regulatory sign is the speed limit sign. The purpose of speed limit signs is to inform drivers of the legal maximum and minimum speeds that are required of them. Drivers are not permitted to go over the limit stated by the sign.

When approaching or passing a troop, police, or military procession, or when driving past construction workers fixing roads, a motor vehicle's driver must travel at a pace of no more than 25 kph.

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making up an answer:

I hypothesize that water will evaporate quicker under an incubator than on the counter.

The experiment; Equal amounts of water in the same type of containers, one under an incubator, and one on a counter with even temperature.

There are 6.13 moles of Ni in 360.0 grams.

1st) We need to know the atomic mass of Ni. We can find it in the Periodic Table of Elements.

Ni atomic mass: 58.69 g/mol

2nd) With a mathematical Rule of Three we can calculate the number of moles in 360.0 grams of Ni:

So, there are 6.13 moles in 360.0 grams of Ni.

Answer:

6.134 moles

Explanation:

Ni atomic mass is 58.6934 g/ mol so I divide 360 to this to get around 6.134

It is consistent and does not need to change with new discoveries is false in the field of science as the science is always change due to new discoveries. Thus option C is correct.

The research questions are completely different from normal question as it involve with specific objective, must be testable,  proven repeatedly.

It should have facts for every questions and can be answered by using data analysis.

The types of research questions are Verification questions, Theory questions, Experimental questions

The verification question involves collection of data from different observation, which include characteristics or properties of a subject.

A theory question means an imaginative exercise, depend on prior knowledge of the phenomenon.

The scientific question or an experimental question used to compare the element of a system when altered, it involves variables and set up of a protocol to test them.

Thus option C is correct.

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Answer:25,06 kJ of energy must be added to a 75 g block of ice.

ΔHfusion(H₂O) = 6,01 kJ/mol.

T(H₂O) = 0°C.

m(H₂O) = 75 g.

n(H₂O) = m(H₂O) ÷ M(H₂O).

n(H₂O) = 75 g ÷ 18 g/mol.

n(H₂O) = 4,17 mol.

Q = ΔHfusion(H₂O) · n(H₂O)

Q = 6,01 kJ/mol · 4,17 mol

Q = 25,06 kJ.

Explanation: