POST-LAB QUESTIONS.
Write and balance the following chemical equations:
a) Al (s) + HCl (aq) → AlCl3 (aq) + H₂ (g)
b) C10H8 (s) + O2 (g) → H₂0 (1) + CO2 (g)
c) Sodium sulfate + barium nitrate → barium sulfate + sodium nitrate
d) Calcium carbonate + heat → calcium oxide + carbon dioxide

The changes that I would make in my experimental procedure to  determine the rate law for the oxidation of the red dye by sodium hypochlorite is that the wavelength at which the dye concentration is calculated would be changed as a result of the operation.

Since there would be an alteration in the wavelength at which the dye concentration, You shouldn't measure at the wavelength where the blue dye absorbs since you would no longer be attempting to detect the rate of oxidation of the blue dye.

Most likely, the red dye absorbs more light at a different, lower wavelength. Decide on the best wavelength to use to measure the red dye concentration, then switch to that wavelength to evaluate the kinetics.

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Mussorgsky dedicated his work Pictures at an Exhibition to a friend, the painter Vladimir Hartmann, who had passed away at the age of 39 at the height of his fame.

Mussorgsky through his music, and Hartmann through his images. The Academy of Fine Arts in St. Petersburg organized an exhibition of Hartmann's artwork in 1874. After visiting the exhibit, Mussorgsky was moved to write his piano piece.

Mussorgsky dedicated his work Pictures at an Exhibition to a friend, the painter Vladimir Hartmann, who had passed away at the age of 39 at the height of his fame. The composer and the larger Moscow artistic community were profoundly affected by the loss of both a close friend and an artistic inspiration.

The design of Hartmann's massive, imposing gate, which was intended to honor the fact that Tzar (king) Alexander the II had survived an attempted assassination, served as the inspiration for the Great Gate of Kiev.

Therefore, the correct answer is option C. It complimented Hartmann's work.

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From the specific heat capacity of mercury, the amount of heat energy required to raise the temperature of 4.0 g of mercury metal from 9.3 °C to 83.0 °C is 77.792 J.

The specific heat capacity of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by one degree Celsius or kelvin.

The specific heat capacity of a substance is a constant that can be used to calculate the amount of heat required to raise the temperature of a given mass of a substance to any temperature.

The specific heat capacity of mercury is 0.140 J/g/k.

The formula for calculating specific heat capacity is given below:

Specific heat capacity, c = Δq/mΔT

where;

Δq = heat change

m = mass of the substance

ΔT = temperature change

The Heat required, Δq, will then be:

Δq = m * c * ΔT

Heat required, Δq = 4.0 * 0.140 * (83.0 - 9.3)

Heat required, Δq = 77.792 J

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Based on the given question about an atom of Calcium and losing electrons, the charge on the ion that forms would be 18.

This refers to the subatomic particle that is positively charged and can be found in the nucleus of every atom.

Calculations and Parameters

Given that:

Ca^2+ represents an ion with 20 protons and 18 electrons.

A calcium atom has 20 protons and 20 electrons.

The 2+ charge close to the symbol shows a loss of two electrons: 20-2=18.

With this in mind, the charge on the ion that forms would be 18.

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The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

A chemical formula can be defined as the expression that states the number and type of atoms present in a molecule of a substance.

When a cation and anion combine to form a compound, there will be transfer of electron form one ion to another creating ionic bond in molecule formed.

The chemical formula for the ionic compound formed by Hg₂²⁺ and CO₃²⁻ is determined as follows;

Hg₂²⁺  + CO₃²⁻  ⇄ HgCO₃

Thus, the chemical formula for the ionic formed by the ions will have have electron transfer from one ion to another.

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The above exercise is designed to help the students understand how living things and non-living things are classified. See the solution for this below.

The items are classified as follows:

Food:

Sports Items:

Furniture:

It is to be noted that The science of living beings or even anything requires classification. It is necessary for understanding the many types of organisms and things. It aids in the identification of different species. It is beneficial to understand the genesis and evolution of organisms.

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Full Question:

In the exercises that follow, arrange the items listed into different groups. Give each group a title indicating what the members of that group have in common.

Steak, football, sausage, chair, table, bacon, sofa, baseball bat, cleats, ham, bookcase

Answer:

Explanation:

was up yo boi

The balanced molecular chemical equation for the reaction in an aqueous solution for ammonium sulfate and iron(II) chloride is

[tex]2AlCl_3(aq) + 3Na_2S(aq) = Al2S_3(aq) + 6NaCl(aq)[/tex]

This is further explained below.

Generally, Equations are a way to depict chemical processes by using chemical formulas and symbols, and these equations may be found online.

In a chemical equation, the reactants are indicated on the left-hand side of the equation, while the products are shown on the right-hand side.

Generally, the Chemical equation is mathematically given as

AlCl_3 + Na_2S ---> Al2S3 + NaCl.

Hence we balance as

[tex]2AlCl_3 + 3Na2_S = Al2S_3 + 6NaCl,[/tex]

After that, we bring in the states. Because the reaction is taking place in an aqueous solution, we need to inject (aq)

[tex]2AlCl_3(aq) + 3Na_2S(aq) = Al2S_3(aq) + 6NaCl(aq)[/tex]

Thus our required After that, we bring in the states. Because the reaction is taking place in an aqueous solution, we need to inject (aq)is

[tex]2AlCl_3(aq) + 3Na_2S(aq) = Al2S_3(aq) + 6NaCl(aq)[/tex]

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The electronic configuration of Bromine is 1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁵.

The electronic configuration of an element refers to the arrangement of electrons in orbitals around the nucleus of an atom of the element.

Electrons in an atom are arranged in orbitals and are fed into the orbitals based on the energy level of the electrons.

The orbitals in which electrons in an atom are placed include:

s-orbital - can take up to 2 electrons

p-orbitals - can take up to six electrons

d-orbital - can take up to 10 electrons

f-orbitals - can take up to 4 electrons

The atomic number of an element determines the electronic configuration of an element.

The atomic number of Bromine is 35.

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Burning 1.09g of a fuel causes the water in a calorimeter to increase by 13.6 °C. If the calorimeter has a heat capacity of 3.09 kJ/°C, what is the energy density of the fuel is - 38.55 kJ/g.

given that:

c =  3.09 kJ/°C

ΔT = 13.6 °C

heat capacity equation is given by :

q = c ΔT

q = 3.09 kJ/°C ×  13.6 °C

q = 42.02 kJ

according to law of conservation of energy sum of heat released by fuel and absorbed by calorimeter is zero

qf + qcal = 0

qf = - q cal = -42.02 kJ

now, The energy density of fuel = - 42.02 kJ / 1.09 g

                                                      = - 38.55 kJ/g

Thus, Burning 1.09g of a fuel causes the water in a calorimeter to increase by 13.6 °C. If the calorimeter has a heat capacity of 3.09 kJ/°C, what is the energy density of the fuel is - 38.55 kJ/g.

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A gas sample is prepared by mixing 15.0 g Cl₂ (70.90 g/mol) with 15.0 g Cl₂ (159.8 g/mol) to a total pressure of 862 mmHg . The partial pressure in mm Hg of Br₂ in the mixture is 262.91 mmHg.

Dalton's law of partial pressures :

The mole fraction of gas × total pressure = partial pressure

mass of Cl₂ = 15.0 g

molar mass = 70.90 g/mol

no. of moles = mass / molar mass

                    = 15.0 g / 70.90 g/mol

                    = 0.211 mol

mass of Br₂ = 15.0 g

molar molar = 159.8 g/mol

no. of moles = mass / molar mass

                    = 15.0 / 159.8 g/mol

                    = 0.093 mol

Total moles = 0.211 mol + 0.093 mol

                    = 0.304 moles

Mole fraction of Br₂ = no. of moles of Br₂ / total moles

                                 = 0.093 / 0.304

                                 = 0.305

Total pressure = 862 mmHg

now putting the values in formula :

partial pressure of  Br₂ = mole fraction of Br₂ × total pressure

                                      = 0.305 × 862 mm Hg

                                      = 262.91 mm Hg

Thus, A gas sample is prepared by mixing 15.0 g Cl₂ (70.90 g/mol) with 15.0 g Cl₂ (159.8 g/mol) to a total pressure of 862 mmHg . The partial pressure in mm Hg of Br₂ in the mixture is 262.91 mmHg.

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Answer: Categorical data

Explanation: As the name implies, are usually grouped into a category or multiple categories. Similarly, numerical data, as the name implies, deals with number variables.

Hope this helps!!! :)

Answer:
0.022

Explanation:

The first number is:
0.0204, and has 4 sig figs (bolded numbers are sig fig contributors)
The second number is:
0.002 and has 3 sig figs

The answer we get must have the same number of sig gifs as the lowest sig fig count of the given values. In this case, the answer would have 3 sig figs and not 4 because the smaller one is 3.
Do the calculations and then round.

0.0204 + 0.002 = 0.0224, and since we only want 3 sig figs, go from the right of the period and count 3 numbers, which would be 0.0224, and notice how the 4 isn't included. This means that the final answer should be 0.022

Answer: Bro you can use Bartleby for this answer

Explanation:

A snow globe is a suspension combination because it shakes up with snow all over it, which eventually settles.

Glycerin, a transparent liquid that is often manufactured from vegetable oils, is one of the secrets to making a snow globe. It is used frequently to reduce the impact of glitter and agitated water on the appearance of snowfall. Your snow globes risk drying out, cracking, and color fading if the right precautions aren't taken to protect them. In general, you should store your snow globes away from hot surroundings, bright sunlight, and other risky places where they could break.

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The liquid filtrate that you collect after filtering your solid product will be acidic no its not acidic its basic

Filtration is a technique used either to remove solid impurities from an organic solution or to isolate an organic solid and the two types of filtration commonly used in organic chemistry laboratories are gravity filtration and vacuum or suction filtration

Filtration is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that permits the fluid to pass through but retains the solid particles and either the clarified fluid or the solid particles removed from the fluid may be the desired product and when we filtrate the liquid part then precipitation is stick means solid part is stick to the filter paper and other liquid part is filtered and this ppt is not the acidic its a basic part

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The energy of the electron is obtained as -0.85 eV.

From the Bohr model of the atom, we know that the electrons that can be found in the shells of hydrogen do have a specific energy level where they could be found. As such the reason being the spectrum of the hydrogen atom is the movement of an electron from one energy level to another.

We can be able to obtain the energy of each of the orbits of the hydrogen atom by the use of;

E = -13.6/n^2

Where n is the principal quantum number.

E =  -13.6/(4)^2

E = -0.85 eV

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Answer: CH40 ( the 4 is not a whole number )

Explanation: If we assume that we have a sample of 100g of the compound, then that would mean we have 37.47 grams (3.12 moles) of carbon, 12.61 grams (12.48 moles) of hydrogen, and 49.92 grams (3.12 moles) of oxygen. The molar ratio of C:H:O is 3:12:3, reducing to 1:4:1, giving the empirical formula of CH4O.

Daniel’s field of study is related to science, and Sanya’s field of study is related to the study of Earth and Space

This is further explained below.

Generally, According to the information that was provided, the researcher named Daniel was doing research on the impact that tropical storms have on the erosion of coastal areas.

These types of research are under the umbrella of the Earth and Space Studies discipline.

Earth, due to the fact that coastal erosions are a part of the study, and Space, due to the fact that storms, which are something that is connected to space, are studied.

When it comes to Sanya, it is quite evident that the emphasis of her research is on the discharges from the industrial facility that have an influence on the freshwater marshes. To be more specific, she is looking into the pH concentration, which is a topic covered in chemistry.

This demonstrates that Daniel majors in Earth and Space Sciences whereas Sanya focuses on Chemistry.

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If 200 g of [tex]KClO_3[/tex] decomposes to produce 135 g of KCl, the amount of oxygen produced should be 65 g.

In every decomposition reaction, the mass of the original substance must be equivalent to the sum of the masses of the products of decomposition.

This is known as the law of mass conservation. If a difference exists between the mass of the decomposing substance and the sum of the masses of the products of its decomposition, then the law of conservation of mass has not been obeyed.

Thus, in the reaction:

[tex]KClO_3 (s) --- > KClO (s) + O_2 (g)[/tex]

Mass of  [tex]KClO_3[/tex] = 200 g

Mass of KClO = 135 g

Mass of  [tex]KClO_3[/tex] = mass of KClO + mass of [tex]O_2[/tex]

Mass of  [tex]O_2[/tex] = mass of [tex]KClO_3[/tex] - mass of KClO

                   = 200 - 135

                      = 65 g

Hence, the mass of  [tex]O_2[/tex] produced will be 65 g.

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The net ionic equation for the precipitation of calcium phosphate from aqueous solution is  Ca²+ (aq)+ S²- (aq)=>CaS(s)-----> CaS(s).

For a precipitation reaction, the net ionic equation is written by first knowing the precipitate, then use the solubility rules (if there are any).

Then one can write down the precipitate's formula that was made to the right of an arrow. The ions that react to get the precipitate as the reactants to the left of the arrow should have their formulas written down also:

Hence:

Since the molecular fomular is: H2S(aq) + CaCl2(aq) -------> CaS(s) + 2HCl(aq)

Then the full ionic equation will be: 2H^+(aq) + S²-(aq) + Ca²+(aq) + 2Cl^-(aq) -------> CaS(s) + 2H^+(aq) + 2Cl^-(aq)

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The heat is released in the formation of 75.0 g of water is 14.78 kJ.

Chemical equation is defined as a chemical reactions are represented symbolically in which the reactants and products are expressed in terms of their respective chemical formulae.

There are basically five types of chemical equation.

SiO2 (s) + 4KF(g) --> SiF4(g)+ 2H2O(l)

According to the reaction

ΔH = -184 / 2 moles of water

N(water) = Q / ΔH

N(water) = 75 / - 184 / 2 moles of water

N(water) = 0.82 mole

M(water) = 18.02 g/mole

M(water) = N(water) = 0.82 x 18.02 g/mole

                                 = 14.78 kJ

Thus, the heat is released in the formation of 75.0 g of water is 14.78 kJ.

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its neutron

Explanation:

Neutrons are located in the nucleus with the protons. Along with protons, they make up almost all of the mass of the atom. The number of neutrons is called the neutron number and can be found by subtracting the proton number from the atomic mass number.

The atomic mass of rubidium is 86.09 amu as rubidium has two common isotopes, rubidium-85 and  rubidium-87 is 84.42 amu.

Abundance of Rubidium-85 = 72.1%

Abundance of Rubidium-87 = 26.7%

To calculate average atomic mass of rubidium -

The percentage of abundances are divided by hundred to obtain a decimal value.

The obtained value of each isotope is multiplied by its atomic mass.

All the isotopic values are added.

So,

Rb-85 = 72.1 = 0.721

              100

Rb-87 = 26.7 = 0.267

              100

Atomic mass of Rb-85 = 0.721 × 84.91

                                     = 61.22 amu

Atomic mass of Rb-87 = 0.267 × 86.91

                                     = 23.20 amu

Hence,

the average atomic mass = 61.22 amu + 23.20 amu

                                            = 84.42 amu

Therefore, atomic mass of rubidium is 84.42 amu.

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Answer:

nuclear is the center part of an atom

Explanation:

it contains neutron and proton (positive charged)

it gets revolved by electron

We have the following balanced equation:

They also give us the heat of reaction equal to -764 kJ, i.e. it is an exothermic reaction.

By observing the reaction, we can deduce that for this heat to be generated, one mole of methanol is needed. Now let's see how many grams that mole of methanol equals. We will use the molecular weight equal to 32.04 g/mol

Now we know the grams of methanol that generate 764 kJ, because the heat of reaction is directly proportional to the mass of the reactants, we can apply a rule of three to know the grams needed to produce a heat of reaction equal to 701 kJ:

So, 29.4 g of methanol must be found to produce 701 kJ of heat

The properties of an alloy are similar to the properties of its components. The elements in an alloy are not combined in fixed proportions is an alloy not considered a compound

Although the physical characteristics of the alloy are intermediate to those of its component metals, the chemical characteristics of each element are unaltered. Physical methods can be used to separate an alloy (separated by melting). A compound is a collection of several components that are connected by chemical connections.

Metal mixes or blends of a metal and another element are known as alloys. A combination of metallic phases or a solid solution of metal elements, known as an alloy, are both possible (a heterogeneous mixture of two or more solutions).

An alloy is a combined, homogenous combination of a metal with other metals or non-metals.

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Answer: Answer is B and C

b: the properties of an alloy are similar to the properties of its components.

c: The elements in an alloy are not combined in fixed propo

Explanation: