write and explain ten careers opportunity in chemistry


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HBr, HCl, HClO₄, KBr and NaCl are all classified as strong electrolytes

HBr (hydrobromic acid), HCl (hydrochloric acid), HClO4 (perchloric acid), KBr (potassium bromide), and NaCl (sodium chloride) are classified as strong electrolytes because they dissociate completely or nearly completely into ions when dissolved in water.

In the case of HBr, HCl, and HClO₄, they are strong acids. When they dissolve in water, they release a high concentration of hydrogen ions (H⁺) and their respective anions (Br⁻, Cl⁻, and ClO₄⁻) which can conduct electric current.

KBr and NaCl, on the other hand, are strong ionic compounds. They dissociate completely into potassium (K⁺) and bromide (Br⁻) ions, and sodium (Na⁺) and chloride (Cl⁻) ions, respectively, when dissolved in water. These freely moving ions enable the solution to conduct electricity.

In summary, these compounds are classified as strong electrolytes because they readily produce ions in solution, allowing them to conduct electricity effectively.

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Answer:

234.4 K

Explanation:

Using the combined gas law equation as follows;

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure (atm)

P2 = final pressure (atm)

V1 = initial volume (L)

V2 = final volume (L)

T1 = initial temperature (K)

T2 = final temperature (K)

According to the provided information,

P1 = 1.00atm

P2 = 2.00 atm

V1 = 5.00L

V2 = 2.00L

T1 = 20°C = 20 + 273 = 293K

T2 = ?

Using P1V1/T1 = P2V2/T2

1 × 5/293 = 2 × 2/T2

5/293 = 4/T2

Cross multiply

293 × 4 = 5 × T2

1172 = 5 T2

T2 = 1172 ÷ 5

T2 = 234.4 K

We can classify the pollutants as -

{ 1 } - point - source pollutant.

{ 2 } - non - point - source pollutant.

{ 1 } - non - point - source pollutant.

{ 1 } - point - source pollutant.

{ 1 } - point - source pollutant.

A pollutant or novel entity is a substance or energy introduced into the environment that has undesired effects, or adversely affects the usefulness of a resource.

Given is to classify as a point - source and non - point source pollutant.

We can classify them as -

{ 1 } - point - source pollutant.

{ 2 } - non - point - source pollutant.

{ 1 } - non - point - source pollutant.

{ 1 } - point - source pollutant.

{ 1 } - point - source pollutant.

Therefore, we can classify the pollutants as -

{ 1 } - point - source pollutant.

{ 2 } - non - point - source pollutant.

{ 1 } - non - point - source pollutant.

{ 1 } - point - source pollutant.

{ 1 } - point - source pollutant.

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Answer:

According to the definition of Point source pollutant and Non point source pollutant, The answers for 5 vertical rows are 1, 1, 2, 1, 2, where 1 represents Point source pollutant and 2 represents Non point source pollutant.

What are Point source pollutant and Non point source pollutant?

Point Source: Sources of pollution which are close to the water sources are called point sources. They are discharged directly into water bodies and are more harmful.

Non-point sources: Sources of pollution which are scattered and do not have any specific location are called non-point sources. They are discharged away from water bodies and at various places and are less harmful in comparison to point source water pollution.

Therefore, According to the definition of Point source pollutant and Non point source pollutant, The answers for 5 vertical rows are 1, 1, 2, 1, 2, where 1 represents Point source pollutant and 2 represents Non point source pollutant.

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Answer:

the law of definite proportion states that in a compound the ratio of atom is fixed

for example, hydrogen and oxygen in pure water is always 1:8 by weight

Answer:

b atoms

Explanation:

everything is made up of atoms

H3O+ is overexposed before the equivalency point. By deducting the amount of additional OH- from the amount of starting H3O+ then dividing by the total volume, you may determine the [H3O+].

The capacity of an object is expressed in terms of volume. A cup's capacity is described as 100 ml, for instance, if it can hold 100ml in its brim. The quantity of space a three-dimensional item takes up can also be referred to as volume.

A three-dimensional object's volume, which is expressed in cubic units, is the amount of space it takes up. The cubic units cm3 and in3 are two examples. On the other hand, mass is a measurement of the amount of matter in an item. How much an object weighs is frequently used to determine mass.

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Number of moles of CO2 which are produced when 13 mol of C2H6 are used up is 36.

Moles is defined as the ratio of given mass of compound to the molar mass of compound.

Moles = given mass/ molar mass

Molar mass of compound is defined as the sum of atomic mass of all elements forming that compound.

2C2H6 + 7O2 = 4CO2 + 6H2O

As we noticed from the reaction that 2 moles of C2H6 produces 4 moles of CO2.

So, 1 moles of C2H6 produces 4/2 moles of CO2, means 2 moles of CO2.

Therefore, 13 moles of C2H6 produces 2 × 13 moles of CO2, means 26 moles of CO2.

Thus, we concluded that the number of moles of CO2 which are produced when 13 mol of C2H6 are used up is 36.

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Answer:

5240

Explanation:

I'm not sure tho sorry

Answer:

See explanation

Explanation:

The law of conservation of matter states that "matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same."(Virginia)

Hence, the quantity of matter present before and after the candle burn must remain the same in accordance with this law stated above.

Hence, my friend was not correct.

Answer:

the wave model of light is useful for explaining brightness, color, and the frequency-dependent bending of light at a surface between media. For example, students could observe some of the wave behaviors or light by observing that when light passes through a small opening the waves spread out. They could observe that if the wavelength is short, the waves spread out very little, whereas longer wavelengths spread out more

Explanation:

Answer:

E

Explanation:

When the temperature is increased while keeping the volume constant, the equilibrium will shift in the direction that consumes heat. This is known as Le Chatelier's principle. In an exothermic reaction (ΔH°rxn < 0), the forward reaction releases heat. Therefore, by increasing the temperature, the equilibrium will shift in the direction that absorbs heat, which is the reverse reaction.

In this case, the reverse reaction is the formation of N₂O₄(g) from 2NO₂(g). By increasing the temperature, the equilibrium will shift to the left, favoring the formation of more reactants (NO₂) and reducing the amount of product (N₂O₄).

To summarize, when the temperature is increased while the volume is kept constant, the equilibrium of the given chemical reaction will shift to the left, favoring the formation of more reactants (NO₂) and reducing the amount of product (N₂O₄).

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If the nucleotide compared to the shoulder, displacements of the hip joints are larger.

The comparison of the nucleotid to the shoulder can be used to understand the movement of the hip joints as well. As the shoulder extends downward, the hip can originate from a point of flexion before it extends up and outward.

This is a result of the vertical pull of the shoulder being countered by the equal and opposite force of the hip pulling in the opposite direction. The hip is able to take some of the load off the shoulder, allowing for a greater range of motion in the shoulder movement. With the hip helping to counter the shoulder movement, a larger range of motion is achieved.

When it comes to displacing the hip joints, it is important to understand the mechanics of the movement. Movement of the hip joint often begins with a slight posterior rotation of the pelvis which helps bring the femur back into a neutral position before it extends up and outward.

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Answer:

869 g Cl₂O

Explanation:

To find the theoretical yield of Cl₂O, you need to (1) convert moles SO₂ to moles Cl₂O (via mole-to-mole ratio from reaction coefficients) and then (2) convert moles Cl₂O to grams Cl₂O (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to reflect the sig figs of the given amount (10.0 moles).

1 SO₂ (g) + 2 Cl₂ (g) ----> 1 SOCl₂ (g) + 1 Cl₂O (g)

Molar Mass (Cl₂O): 2(35.453 g/mol) + 15.998 g/mol

Molar Mass (Cl₂O): 86.904 g/mol

10.0 moles SO₂         1 mole Cl₂O            86.904 g
------------------------  x  ----------------------  x  ------------------  = 869 g Cl₂O
                                    1 mole SO₂              1 mole

Some molecules have more than four electron groups around a central atom, such as SF₆,  the likely arrangement of the six electron groups will be Octahedral

In chemistry, compounds containing six atoms or groups of atoms or ligands symmetrically grouped around a central atom; consist octahedral molecular geometry which is also known as square bipyramidal. The prefix octa refers to the octahedron, which has eight faces.

SF₆ also consists of six atoms making octahedral geometry. In SF₆ 4 atoms will place themselves in a plane, one atom places itself above the plane, and one places, itself below the plane, resulting in an octahedral geometry.

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Answer:

Phosphorus-30

Explanation:

In hyphen notation, the mass number is written after the name of the element. An element that has 15 electrons and 15 neutrons would also contain 15 protons. Since the mass number of an element is the sum of the protons and neutrons in an atom of that element, the mass number of this element is 30.

Also, the number of protons (or electrons for a neutral atom) present in an atom of that element is known as the atomic number of that element.

In the periodic table of elements, the element with atomic number 15 is phosphorus. Thus, phosphorus has 15 protons, 15 electrons and 15 neutrons. Its mass number = 30. In hyphen notation, it is written as: Phosphorus-30

If a nurse researcher is seeking to answer a question about the effectiveness of a particular treatment, the most appropriate type of study would be a randomized controlled trial (RCT).

In an RCT, participants are randomly assigned to different groups: one group receives the treatment being investigated (the experimental group), while another group receives either a placebo or standard care (the control group). The groups are followed over a specific period, and the outcomes are compared to determine the effectiveness of the treatment.

RCTs are considered the gold standard for evaluating the effectiveness of interventions because they allow for control of confounding factors and provide a basis for establishing cause-and-effect relationships. Random assignment helps ensure that any differences observed between the groups are due to the treatment and not other factors.

Additionally, blinding techniques can be used in RCTs to minimize bias. This includes single-blind studies (where participants are unaware of their group assignment) or double-blind studies (where both participants and researchers are unaware).

By comparing outcomes between the treatment and control groups, an RCT provides rigorous evidence to determine the effectiveness of a particular treatment and supports evidence-based decision-making in healthcare.

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1) When the powdered sulfur are placed together in a metal beaker, the both are examples of pure substances

2) When the both substances are heated such that magnesium sulfide is formed, it is no more a mixture but a compound.

The term mixture has to do with a combination of two or more substances that are not chemically combined together. Let us note that a mixture would always retain the properties of the individual substances that do make up the mixture as it were.

When the components of a mixture react chemically then it is no more a mixture because a chemicals bond now exists between the substances and they can no more be separated by means of a physical method.

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Answer:1,01

Explanation:

A 2.7 mol sample of CO2 contains 44.0 grams of CO2. This is because 1 mol of CO2 has a molar mass of 44.01 g/mol.

Therefore, the calculation would be 2.7 mol x 44.01 g/mol = 44.0 grams of CO2.  To find the answer, we need to calculate the molar mass of CO2 first. This can be done by adding up the atomic weights of the atoms present in a molecule of CO2, which is one carbon atom and two oxygen atoms. The atomic weight of carbon is 12.01 g/mol and the atomic weight of oxygen is 15.99 g/mol. Therefore, the molar mass of CO2 is 12.01 + 15.99 + 15.99 = 44.01 g/mol.

To calculate the grams of CO2 in the sample, we need to multiply the molar mass of CO2 (44.01 g/mol) with the amount of moles of CO2 in the sample, which is 2.7 mol. Therefore, the calculation will be 2.7 mol x 44.01 g/mol = 44.0 grams of CO2.

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30.1%

do not ask why it just is.

The number of moles of bromine liquid produced in the experiment is 0.089 mol

To calculate the number of moles of bromine liquid produced, we need to use the formula:

moles = mass / molar mass

First, we need to find the molar mass of bromine, which is 79.904 g/mol. Then we can plug in the values:

moles = 7.1g / 79.904 g/mol

moles = 0.089 mol

Therefore, the number of moles of bromine liquid produced in the experiment is 0.089 mol (rounded the answer to 2 significant digits).

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Mass of hydrate + crucible = 47.29 g

Mass of anhydrous salt = 2.7 g

Molar mass of anhydrous salt CuSO4 = 159.5 g

Given,

mass of empty crucible = 42.45 g

mass of hydrate salt= 4.84 g

mass of crucible after first heating = 46.1 g

mass of crucible after second heating= 45.153 g

mass of crucible after third heating= 45.15 g

so, as per the question we need to find...

Mass of hydrate + crucible = ? g

Mass of anhydrous salt = ? g

Molar mass of anhydrous salt CuSO4 = ? g

∴Mass of hydrate + crucible = 42.45 + 4.48 = 47.29 g

The given salt is in hydrate form, to remove water from this molecule we need to perform heating .

So we are taking the substance into the crucible as it is in less quantity.

Here, we performed heating 3 times and note the weight after every heating.

After this, assume that the water is totally evaporated and the remaining salt is in anhydrous form,

∴ Mass of anhydrous salt = 45.15 - 42.45 = 2.7 g

To find the molar mass of anhydrous salt of CuSO4,

atomic weight of Cu = 63.5 g

atomic weight of S = 32 g

atomic weight of O =16 g

∴ molar mass of anhydrous salt of CuSO4 = 63.5 + 32 + (16 ×3)

                                                                   =159.5 gm

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The answer that should be reported for the mass of a sample obtained by taking the difference between the mass of the sample plus beaker (75.652 g) and the mass of the beaker (74.8 g) is 0.852 g.

The mass of a substance is a measure of the amount of matter present in that substance.

The mass of a substance is measured using a balance.

The unknown mass of a given substance can be obtained by taking differences in mass of two substance that contains that substance.

For example, the mass of a given sample of substance is calculated as follows:

Mass of the sample plus beaker = 75.652 g

Mass of the beaker alone = 74.8 g

Mass of the sample = Mass of the sample plus beaker - Mass of the beaker alone

Mass of the sample = 75.652 - 74.8 = 0.852 g

In conclusion, the mass of the sample is found by subtraction.

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The landform that is a result of the chemical weathering of carbonate rock is

While the chemical weathering of carbonate rock does occur, it can result in voids or cavities under the surface. When sedimentary layers become unstable and unable to support their own weight, a concave impression known as a sinkhole will form.

Sinkholes are prevalent in areas that have an ample supply of carbonate rock, which itself poses a danger due to its potential impact on infrastructure and human well-being. It is important to note that the chemical deterioration of carbonate rock does not typically contribute to natural developments like mountains, dunes, or rivers.

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The melting point of acetanilide mixed with 10y weight of naphthalene will be lower than 113.5°C – 114°C.

Acetanilide has a melting point of 113.5°C – 114°C. When it is mixed with 10y weight of naphthalene, the melting point of the mixture will be lower than that of acetanilide. This is because naphthalene has a lower melting point than acetanilide (80.2°C).

Mixing two compounds can alter the physical properties of the resultant mixture. In this case, the melting point of acetanilide is decreased when mixed with naphthalene. This is due to the fact that naphthalene disrupts the regular crystalline packing of acetanilide.

The result is a lower melting point for the mixture compared to the pure acetanilide. Mixing of two substances can either increase or decrease the melting point of the mixture. The degree of effect depends on the type of substance that is being added to the original substance.

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Mass is the weight of the compound or the molecule in a sample that is given in grams. The mass of sucrose in the sample is 171 gms.

The mass of the compound is the product of the molar mass of the compound and the number of moles of the compound in a sample.

Given,

The molar mass (m.w.t) of sucrose = 342.3 g/mol

Number of moles (n) of sucrose = 0.500 moles

The mass of sucrose is calculated as:

\(\begin{aligned} \rm mass &= \rm molar\; mass \times moles \\\\&= 342.3 \times 0.500\\\\&= 171.15 \;\rm gm\end{aligned}\)

Therefore. the mass of sucrose in the sample is option A. 171 gms.

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Answer:

Answers are in the explanation.

Explanation:

A solution is the mixture of 2 or more substances in which the substance in less amount is the solute and the substance must abundant is the solvent.

The more soluble solute is the one that can be dissolved in the biggest amount. As there are dissolved 10g of sugar and 5g of salt, the more soluble is sugar

Normally, the solutes are more solubles when the temperature increases. If you can't dissolve a solute, you can try heat it and probably it would be dissolved.

The number of mole of aluminum chloride, AlCl₃ produced when 5 moles of chlorine gas, Cl₂ reacts is 3.33 moles

2Al(s) + 3Cl₂(g) → 2AlCl₃(s)

From the balanced equation above,

3 moles of Cl₂ reacted to produce 2 moles of AlCl₃.

From the balanced equation above,

3 moles of Cl₂ reacted to produce 2 moles of AlCl₃.

Therefore,

5 moles of Cl₂ will react to = (5 × 2) / 3 = 3.33 moles of AlCl₃.

Thus, 3.33 moles of AlCl₃ were obtained from the reaction.

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