A chemist is asked to determine the specific heat capacity of an unknown mineral. The 149-g sample was heated to 92.7°C and placed into a calorimeter containing 81.4 g of water at 20.0°C. The heat capacity of the calorimeter was 12.8 J/K. The final temperature in the calorimeter was 23.7°C. What is the specific heat capacity (in J/g°C) of the mineral? Enter to 4 decimal places.​

Answer:

84.8%

Explanation:

Step 1: Given data

Bob measured out 1.60 g of Na. He forms NaCl according to the following equation.

Na + 1/2 Cl₂ ⇒ NaCl

According to this equation, he calculates that 1.60 g of sodium should produce 4.07 g of NaCl, which is the theoretical yield. However, he carries out the experiment and only makes 3.45 g of NaCl, which is the real yield.

Step 2: Calculate the percent yield.

We will use the following expression.

%yield = real yield / theoretical yield × 100%

%yield = 3.45 g / 4.07 g × 100% = 84.8%

CO2 has a linear geometric shape due to the two sigma bonds between the carbon and oxygen valence electrons. Both oxygen molecules are sp2 hybridized meaning they both have one sigma bond and two pairs of un bonded electrons.

Answer:

what she saidlolbsbsjs

According to Boyle's law, the pressure in the acetylene tank is 268.33 atmospheres.

Boyle's law is an experimental gas law which describes how the pressure of the gas decreases as the volume increases. It's statement can be stated as, the absolute pressure which is exerted by a given mass of an ideal gas is inversely proportional to its volume provided temperature and amount of gas remains unchanged.

Mathematically, it can be stated as,

P∝1/V or PV=K. The equation states that the product of of pressure and volume is constant for a given mass of gas and the equation holds true as long as temperature is maintained constant.

In the given problem , by substituting values in formula P₁V₁=P₂V₂, P₂=115×7/3=268.33 atmospheres.

Hence, the pressure in acetylene tank is 268.33 atmospheres.

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Soda provides nutritional value that helps plants grow.

Explanation:

I just did this question and that’s what was right.

To solve this we must be knowing each and every concept related to  nutritional value. Therefore, the good hypothesis for the question is Soda offers nutrients that support plant growth.

The FDA's overall health claim regulation defines "nutritive value" as value in maintaining human existence through processes like promoting growth, replacing lost vital nutrients, and providing energy.

It also includes facilitating in the efficient function of traditional nutritional methods and of other metabolic pathways needed for the routine maintenance of human existence. Soda offers nutrients that support plant growth.

Therefore, the good hypothesis for the question is Soda offers nutrients that support plant growth.

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Answer:

26.0 mL

Explanation:

The reaction that takes place is:

First we calculate the molar concentration of the diluted sulfuric acid solution, using the C₁V₁=C₂V₂ formula:

Now we calculate how many H₂SO₄ moles would there be in 10.00 mL of this diluted solution, using the definition of molarity:

Then we convert 3.25 mmoles of H₂SO₄ into mmoles of NaOH, using the stoichiometric coefficients of the balanced reaction:

Finally we calculate the required volume of the NaOH solution, using the definition of molarity:

Option B, where [OH-] is 1.0 x 10-13 mol dm-³3, is the only one that can be considered basic. Therefore, Option B is the correct answer.

To determine whether a solution is basic or acidic at 25 °C, we can compare the concentration of hydroxide ions ([OH-]) with the concentration of hydronium ions ([\(H_3O\)+]). In a neutral solution, the concentrations of [\(H_3O\)+] and [OH-] are equal, resulting in a pH of 7.

Option A states that the concentration of [\(H_3O\)+] is 1.0 x 10-3 mol dm-3. Since [\(H_3O\)+] represents the concentration of hydronium ions, this solution would be acidic because the concentration of [\(H_3O\)+] is higher than [OH-], indicating an excess of hydronium ions.

Option B states that the concentration of [OH-] is 1.0 x 10-13 mol dm-³3. In this case, [OH-] is higher than [\(H_3O\)+], indicating an excess of hydroxide ions. Therefore, this solution would be considered basic.

Option C states that the solution has a pH of 4.00. A pH of 4.00 is below the neutral pH of 7, indicating an excess of hydronium ions and an acidic solution. Therefore, this option does not represent a basic solution.

Option D states that the concentration of [\(H_3O\)+] is 1.0 x 10-13 mol dm-3. Similar to Option A, this concentration of [\(H_3O\)+] indicates an acidic solution, not a basic one.

Option B

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Answer:

D is the correct answer

Explanation:

In order for a solution to be basic at 25 C, the H+ concentration has to be less than the OH- concentration, and given that H+ times OH- is 10^-14, we deduce that H+ must be less than 10^-7 for the solution to be acidic. Thus, A can be eliminated, and so can C. With B, we calculate an H+ concentration of 0.1M, which also fails to be less than 10^-7
Thus, D is the correct answer and we can verify that as H+ is less than 10^-7.



Note: I do not know why my previous answer was deleted for "being incorrect", and i'm not sure how the incorrect answer was "expert verified", but I am as certain that D is the correct answer as i am sure of 3*(4+5-1) being equal to 24.

Answer:

As it flows through the soil, acidic rain water can leach aluminum from soil clay particles and then flow into streams and lakes. The more acid that is introduced to the ecosystem, the more aluminum is released. Some types of plants and animals are able to tolerate acidic waters and moderate amounts of aluminum

Explanation:

When we buy artificial jewelry after sometime it looks worn off because of the chemical reactions of the materials which are used in making the jewelry.

This is referred to as the process in which one or more substances, the reactants, are converted to one or more different substances, the products under various types of conditions.

When artificial jewelry is made, it may be coated with a layer of plating, such as gold or silver, to give it a more attractive appearance which is therefore subject to various types of reactions when in contact with substance such as oil, sweat etc which us why it  looks worn off after some time.

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Answer:

3787500 Torr

Explanation:

1 Pascal = 0.0075 Torr

So:

5.05x10^8 Pa --- x

1 Pa --- 0.0075 Torr

x = 5.05x10^8 × 0.0075

x = 3787500 Torr

Answer:

point B

Explanation:

as you may see that's where the two color lines meet and there only

Answer:

This reaction will not occur since copper is less reactive than zinc.

Explanation:

Since copper is located at a lower position in the reactivity series than zinc, there will be no displacement reaction if copper is put into zinc (II) nitrate solution.

Using the standard reaction enthalpies,

For, 2S(s) + 3O₂(g) → 2SO₃(g) , ΔH⁰(reaction) = - 791 KJ

The standard enthalpy of the reaction describe as energy released or gain by the reaction at the time of reaction done or transformation of compound by chemical reaction, during these chemical process heat energy released or required from reaction. And standard enthalpy calculated as amount of heat released or required per mole of reaction at constant pressure.

Enthalpy of the reaction depends on the volume, pressure and internal energy of the reaction or system so, enthalpy is a state function. And value of enthalpy may be negative or positive because its show the state of reactions means reaction required energy or reaction released energy and it denoted by the negative and positive value of enthalpy.

Enthalpy denoted by the: ΔH⁰

and its unit is kJ/mol. According to Hess’s law total enthalpy change of the reaction is the sum of all individual changes in enthalpy.

Change in enthalpy calculated by the, ΔH = q

or, ΔH = H(reactant) - H(product)

or, q = H(reactant) - H(product)

or, ΔH⁰ = H(reactant) - H(product)

Where,

ΔH = change in enthalpy

q = heat or energy.

So, Enthalpy change for the reaction:

ΔH⁰ = ∑ΔH(product) - ∑ΔH(reactant)

Now, write the reaction and find balance chemical reaction:

SO₂(g) → S(s) + O₂(g) , ΔH⁰ = +296.8 kJ    ............. (i)

2SO₂(g) + O₂(g) → 2SO₃ (g) , ΔH⁰ = -197.8 kJ  ................(ii)

Next, to determine ΔH⁰(reaction) for the following reaction:

2S(s) + 3O₂(g) → 2SO₃(g)

to find enthalpy so, first reverse the reaction equation (i)

S(s) + O₂(g) → SO₂(g),   ΔH⁰ = - 296.8 kJ  .......... (iii)

[If we reverse the chemical reaction than standard enthalpy of these reaction also goes to reverse so]

Now, multiply the reaction equation (iii) by 2 and get-

2S(s) + 2O₂(g) → 2SO₂(g),    ΔH⁰ = -593.6 kJ ……(iv)

Now, add the reaction equation (ii) and reaction equation (iv):

2SO₂(g) + O₂(g) → 2SO₃ (g) , ΔH⁰ = -197.8 kJ

2S(s) + 2O₂(g) → 2SO₂(g),    ΔH⁰ = -593.6 kJ

from adding reaction equation (ii) and (iv) we get the reaction, we get:

2S(s) + 3O₂(g) → 2SO₃(g) , ΔH⁰(reaction) = ( -197.8 kJ) + (-593.6 kJ)

                                                                     = - 791 KJ

[Standard enthalpies of the reaction are negative means reaction required energy to done reaction completely]

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Answer:

Voltage is the measure of electric potential energy per unit charge, current is the flow of electric charge through a circuit, and resistance is the property of a material that opposes the flow of electric current.

Ohm's Law relates these three concepts by stating that current is directly proportional to voltage and inversely proportional to resistance.

Hope this helps!

Answer:

steel because water gold and honey is not a mixture of something

Answer:

Steel

Explanation:

Answer:

16

multiply 8✖2 and you would get 16.

Answer:

There are strong intermolecular forces between particles that make up liquids, but not gases.

Explanation:

Solids, liquids and gases are the three states of matter that exists. However, they possess varying properties that distinguishes them from one another. One of these properties is the strength of the intermolecular forces that hold their molecules together.

The intermolecular forces of each state of matter becomes weak in this order: solid>liquid>gas.

- Intermolecular forces in solid molecules are very strong, hence making them compact and well attached to each other.

- Intermolecular forces in liquid molecules are not too strong, hence, cannot exist in a fixed position but tend to flow.

- Intermolecular forces in gaseous molecules are very weak, hence, gases can move easily and rapidly in any given space.

The concentration of H₂SO₄ solution is equal to 0.0480 M.

A neutralization reaction is described as a chemical reaction where acid and base react to produce respective salt and water. When a strong acid reacts with a strong base then the salt can be neutral.

When H₂SO₄ (a strong acid) reacts with NaOH, the resulting salt is Na₂SO₃  and water.

H₂SO₄  +  2 NaOH   →   Na₂SO₄  +   2H₂O

Given, the concentration of NaOH = 0.146 M

The volume of the NaOH = 14.85 ml = 0.01485 L

The number of moles of NaOH, n = M × V = 0.146 × 0.01485 = 0.00216 M

The volume of the  H₂SO₄ = 22.55 ml = 0.02255 L

The number of moles of  H₂SO₄, n = 0.00216/2 = 0.00108 mol

The concentration of H₂SO₄ =0.00108/0.02255 = 0.0480 M

Therefore, the molarity of  H₂SO₄ is 0.0480 M.

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Explanation:

it varies due to ph difference

Hcl or hydrochloric acid has a very low ph (about 1) and formic acid has a higher 1

the lower the ph the more acidic and corrosive it making it stronger

hope this helps

The cardboard sleeves reduce the heatness from the coffee cup. So then the cosumer does not get a burn.

The Microscope part and their right descriptions are as follows

Iris Diaphragm: A. Increases or decreases the light intensity

Objective Lens System: B. After light passes through the specimen, it next enters this lens system

Stage: C. Platform that supports a microscope slide

Adjustment Knob: D. Causes stage (or objective lens) to move upward or downward

Condenser: E. Concentrates light onto the specimen

Other parts of a microscope and their description that you should know about includes;

Eyepiece - The lens that you look through to see the image of the specimen.

Body tube - The tube that connects the eyepiece to the objective lenses.

Arm - The part of the microscope that supports the body tube and connects it to the base.

Base - The part of the microscope that supports the arm and provides stability.

Illuminator - The light source that provides light for the microscope.

Stage clips - The clips that hold the microscope slide in place on the stage.

Revolving nosepiece - The part of the microscope that holds the objective lenses and allows them to be rotated into place.

The above answer is in response to the full question below;

Match the names of the microscope parts in column A with the descriptions in column B. Place the letter of your choice in the space provided.

1. Iris diaphram

2. Objective lens system

3. Stage

4. Adjustment knob

5. Condenser

Increases or decreases the light intensity

2. After light passes through the specimen, it next enters this lens system

3. Platform that supports a microscope slide

4. Causes stage (or objective lens) to move upward or downward

5. Concentrates light onto the specimen

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Answer:

The percentage of IF₅ (by mole) in the final product mixture will be 50%. This is determined by the stoichiometry of the reaction, the given molar mass of the reactants, and the ideal gas law.

Explanation:

When a substance changes into an entirely new substance with different properties, it is called a chemical change.

A chemical change is a process where a substance undergoes a transformation that results in the formation of a new substance with different chemical and physical properties. During a chemical change, chemical bonds between atoms are broken and new ones are formed, leading to the creation of a different substance.

Chemical changes are typically irreversible and involve a release or absorption of energy in the form of heat, light, or sound. Examples of chemical changes include combustion, oxidation, and digestion. In contrast, physical changes involve a change in the physical state or form of a substance without altering its chemical composition.

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The balanced chemical equation for the combustion of propane with oxygen is: C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

To balance the equation, first balance the carbon atoms on both sides of the equation. There are three carbon atoms in the propane molecule and three in the carbon dioxide molecule, so balance the carbon atoms by putting a coefficient of 3 in front of the CO₂ molecule.

C3H8 + 5O2 → 3CO₂

Next, balance the hydrogen atoms. There are eight hydrogen atoms in the propane molecule and four in the water molecule, so balance the hydrogen atoms by putting a coefficient of 4 in front of the H₂O molecule.

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Finally, balance the oxygen atoms. There are five oxygen atoms on the left side and 10 on the right side, so balance the oxygen atoms by putting a coefficient of 5 in front of the O₂ molecule.

Therefore, the correct whole number coefficient for propane, C3H8, is 1.

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Answer: Shown below

Explanation:

CaCl2=calcium chloride

Mg(NO3)2=Magnesium nitrate

ZaCl2=Zinc Chloride

NH2Cl=Chloramine

AgNO2=Silver nitrate

NaCl= Sodium chloride

KI=Potassium iodide

PbSO4=Lead(II) Sulfate

n82CO3=Sodium carbonate

KNO3=Potassium nitrate

N82SO4=Sodium Sulfate.

I hope this helped please give Brainliest!

The name of the compounds and the involved ion are as follows;

Ionic compound is any of a large group of chemical compounds consisting of oppositely charged ions, wherein electron transfer, or ionic bonding, holds the atoms together.

Ionic compounds, when in an aqueous solution, dissociates into its respective ions. This question gives the chemical formula of certain compounds. For example, the sodium ions attract chloride ions and the chloride ion attracts sodium ions. The result is a three-dimensional structure of alternate Na⁺ and Cl⁻ ions.

The names of the chemical compound and the ionic elements that make them up are given in the main answer part.

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Ina chemical reaction, no mass can be destroyed or created and no energy can be destroyed or created.

Thus, the energy released from a chemical reaction, be it heat or light, have to come from the reactants of this reaction.

Kinetic energy can be release, but not on chemical reactions, kinetic energy change is not part of chemical reactions.

The energies involved in chemical reactions are bond energies.

The energy can't come from the products, because for this energy to be released the bonds have to be broken, and the products are the result, so they will no be broken.

Thus, the energy can only com from the stored bond energy in the reactants.

Answer:

a)

\(K_2=1.3x10^{2}atm^{-1/2}\)

b)

\(PCl_5\rightarrow PCl_3+Cl_2\)

\([PCl_5]=0.0375M\)

Explanation:

Hello!

a) In this case, since we can see that the second reaction is equal to the half of the first reaction, we can relate the equilibrium constants as shown below:

\(K_2=K_1^{1/2}\)

Thus, by plugging in the the equilibrium constant of the first reaction we obtain:

\(K_2=(1.6x10^4atm^{-1})^{1/2}\\\\K_2=1.3x10^{2}atm^{-1/2}\)

b) In this case, for the described reaction we can write:

\(PCl_5\rightarrow PCl_3+Cl_2\)

Thus, the corresponding equilibrium expression is:

\(K=\frac{[PCl_3][Cl_2]}{[PCl_5]}\)

In such a way, since we know the equilibrium constant and the concentrations of PCl3 and Cl2 at equilibrium, we can compute the concentration of PCl5 at equilibrium as follows:

\([PCl_5]=\frac{[PCl_3][Cl_2]}{K}\\\)

\([PCl_5]=\frac{\frac{0.20mol}{4L} *\frac{0.12mol}{4L} }{0.04}\)

\([PCl_5]=0.0375M\)

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