Indicate the type of observation that is best represented by the figures below.

Identifying Types of Observations

qualitative
quantitative

Identifying Types of Observations
qualitative

quantitative

Identifying Types of Observations
qualitative

quantitative

The standard enthalpy change for the reaction 2A+B⇌2C+2D is  664 kJ/mol and The heat that is absorbed when 3.70 mol of A reacts is 2456.8  J

The heat changes that take place as reactants combine to generate a product are measured by the enthalpy of a reaction.

The following formula can be used to determine the enthalpy change of a reaction:

Hess's law states that

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Considering the given reaction: 2A + B ⇌ 2C + 2D  

Enthalpy of reaction =  product's enthalpy - the reactant's enthalpy.

Enthalpy of reaction (ΔH°f) = (2 C + 2 D) - (2 * A + B)

Enthalpy of reaction  (ΔH°f)  = {[2(223) + 2(-523)] - [2(-245) + 2(-387)]}

Enthalpy of reaction  (ΔH°f)  = 664 kJ/mol

ΔH = q ÷ n

ΔH = molar enthalpy (heat) of solution

q = amount of energy (heat) released or absorbed

n = moles of solute

so. q = ΔH xn

q = ΔH xn

q = 664 kJ/mol x 3.70 mol

Q= 2456.8  J

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Answer:

D

Explanation:

The unit used to measure atomic mass is the atomic mass unit (amu). A single amu is equivalent to 1/12 the mass of an atom from the carbon-12 isotopIsotopes with different numbers of protons and neutrons will have an actual mass slightly different from the atomic mass calculated in atomic mass units.

Answer:48

Explanation:

Answer:  3. 0.125 X 10”23 molecules

Explanation:

Answer: A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.

Explanation:

Answer:

\(M=0.362M\)

Explanation:

Hello!

In this case, according to the following chemical reaction:

\(AgNO_3(aq)+NaCl(aq)\rightarrow AgCl(s)+NaNO_3(aq)\)

It is possible to compute the moles of silver nitrate via stoichiometry that produced 4.576 g of silver chloride as shown below:

\(n_{AgNO_3}=4.576gAgCl*\frac{1molAgCl}{143.32gAgCl}*\frac{1molAgNO_3}{1molAgCl}\\\\n_{AgNO_3}=0.03193molAgNO_3\)

Thus, since the molarity is obtained by dividing moles by volume, we obtain:

\(M=\frac{0.03193mol}{0.08811L}\\\\M=0.362M\)

Best regards!

Answer:

0.00500M of Na₂C₂O₄

Explanation:

When are dissolved in 150 mL of 1.0 M H2SO4.

We can solve this problem finding molarity of sodium oxalate: That is, moles of Na2C2O4 per liter of solution. Thus, we need to convert the 0.1005g to moles using molar mass of sodium oxalate (134g/mol) and dividing in the 0.150L of the solution:

0.1005g * (1mol / 134g) = 7.5x10⁻⁴ moles of Na₂C₂O₄

In 0.150L:

7.5x10⁻⁴ moles of Na₂C₂O₄ / 0.150L =

The concentration of the solution is 0.005 M.

From the information available in the question;

We know that;

Mass of  Na2C2O4 = 0.1005 g

Volume of solution = 150 ml

To obtain the number of moles of Na2C2O4;

Number of moles = mass/molar mass

Molar mass of Na2C2O4  = 134 g/mol

Number of moles =  0.1005 g /134 g/mol = 0.00075 moles

Concentration = number of moles/volume

Volume of solution = 150ml or 0.15 L

Concentration =  0.00075 moles/0.15 L

= 0.005 M

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Missing parts

An acidic solution of sodium oxalate (Na2C2O4) was prepared by dissolving ~0.100 g of Na2C2O4 in 150 mL of 1.0 M H2SO4 in a 250 mL Erlenmeyer flask. Calculate the concentration of the resulting sodium oxalate solution if 0.1005 g of Na2C2O4 was used.

A. The balanced equation for the reaction is given as

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

B. The mass (in grams) of carbon dioxide that can be produced by burning 20.0 pounds of propane is 27216.49 g

A. Balance equation

The balanced equation for the combustion of propane is:

C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O

B. How to determin the mass (in grams) of CO₂ produced

The mass (in grams) of CO₂ produced from the reaction can be obtained as follow:

From the balanced equation above,

0.097 pound of C₃H₈ reacted to produce 132 g of CO₂

Therefore,

20 pound of C₃H₈ will react to produce = (20 × 132) / 0.097 = 27216.49 g of CO₂

Thus, the mass of CO₂ produced is 27216.49 g

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Answer:

true is correct

Polyester and Nylon are examples of synthetic materials called polymers. This statement is True.

Polymers are large molecules composed of repeating subunits called monomers, which are chemically bonded together. In the case of polyester, it is made from a polymer called polyethylene terephthalate (PET), while Nylon is made from polyamide monomers. These polymers are created through polymerization processes that combine smaller molecules to form long chains.

Synthetic polymers like polyester and nylon are widely used in various applications due to their desirable properties, such as strength, durability, and resistance to chemicals and moisture.

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Answer:

All is Correct

Explanation:

Fossil fuels have the following properties:

Therefore, the answer is to select all

Answer:

It's A, B, and D

Explanation:

Maybe not D, because that is burning wood like charcoal. Not sure about that. Hope this helps!

Answer:

Explanation: M(PCL5)= 31 + 5(35.5)

=208.5g/mol

M(H20)= 18g/mol

n(PCL5) = 75.5÷208.5

= 0.362mol

n(HCl)/n(PCL5)= 5/1

n(HCl)= 5×0.362

=1.81mol of HCl

Answer:

453 or 453.592

Explanation:

400 jellybeans are about a pound and a pound is 453.592 grams

Answer:

Prueba con tus argumentos quienes sufren mas con la violencia?

Answer:

Sure! The complete balanced chemical equation for the reaction you provided is: `2A + BC3 -> AC2 + 3B`.

Your question has been heard loud and clear.

Specific applications of mass spectrometry include drug testing and discovery, food contamination detection, pesticide residue analysis, isotope ratio determination, protein identification, and carbon dating.

Thank you

The primary function of mass spectrometry is as a tool for chemical analyses based on detection and quantification of ions according to their mass-to-charge ratio. However, mass spectrometry also shows promise for material synthesis.

tbh google

✌️

Answer:

A

Explanation:

In this exercise we will use Maxwell botzamn's knowledge of distribution to explain what happens, like this:

The Maxwell-Boltzmann distribution describes the distribution of velocities between particles in a sample of gas at a given temperature.

Then we can analyze that the graph referring to the boltzman distribution will be:

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The statements that best support the student’s claim is that

A cell is described as the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body.

A cell has three main parts which include :

The cell membrane surrounds the cell and controls the substances that go into and out of the cell.

In conclusion, Cells are the basic building blocks of all living things.

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Answer:

Explanation:

In order to calculate the molarity of the solution we use the formula

\(c = \frac{n}{v} \\ \)

where

c is the molarity

n is the number of moles

v is the volume in dm³

From the question

n = 7 mol

v = 9 L = 9 dm³

We have

\(c = \frac{7}{9} \\ = 0.77777777...\)

We have the final answer as

Hope this helps you

Answer:

molecules will speed up

Explanation:

Answer:

Title: Determination of Chloride Concentration in Water

Abstract:

This lab report presents a method for determining the chloride concentration in water samples. The analysis is based on the principle of titration using a silver nitrate solution. By titrating the water sample with the silver nitrate solution, the endpoint is determined using a silver chromate indicator, indicating the completion of the reaction between chloride ions and silver ions. From the volume of silver nitrate solution required to reach the endpoint, the chloride concentration in the water sample can be calculated.

Introduction:

Chloride is a common anion found in water and its concentration is important for various purposes, including environmental monitoring, drinking water quality assessment, and industrial processes. This lab aims to determine the chloride concentration in a water sample using a titration method.

Materials and Equipment:

1. Water sample

2. Silver nitrate solution (standardized)

3. Sodium chromate indicator

4. Burette

5. Erlenmeyer flask

6. Pipettes

7. Volumetric flask

8. Distilled water

9. White tile

Procedure:

1. Preparation of Silver Nitrate Solution:

  - Prepare a standard silver nitrate solution with a known concentration.

  - Ensure the solution is properly labeled and stored in a dark bottle to minimize exposure to light.

2. Sample Preparation:

  - Collect a representative water sample in a clean container.

  - If necessary, filter the water sample to remove any particulate matter.

  - Transfer an appropriate volume of the water sample (usually 50 mL) into a clean and dry Erlenmeyer flask.

3. Titration:

  - Add a few drops of sodium chromate indicator to the water sample in the flask.

  - Fill the burette with the standardized silver nitrate solution.

  - Slowly add the silver nitrate solution from the burette into the water sample, while swirling the flask.

  - Continue the addition of silver nitrate solution until the appearance of a reddish-brown color, indicating the endpoint of the titration. Record the volume of silver nitrate solution used.

4. Blank Determination:

  - Perform a blank titration using distilled water instead of the water sample.

  - Follow the same procedure as described in step 3 to determine the volume of silver nitrate solution used.

5. Calculation:

  - Calculate the chloride concentration in the water sample using the formula:

    Chloride concentration (mg/L) = (V - V0) x M x 35.45 / V1

    Where:

    - V is the volume of silver nitrate solution used for the water sample (mL)

    - V0 is the volume of silver nitrate solution used for the blank (mL)

    - M is the molarity of the silver nitrate solution (mol/L)

    - V1 is the volume of the water sample used (L)

Results and Discussion:

- Record the volumes of silver nitrate solution used for both the water sample and the blank.

- Calculate the chloride concentration in the water sample using the provided formula.

- Discuss any sources of error and potential improvements in the procedure.

- Compare the obtained chloride concentration with relevant guidelines or standards to assess the water quality.

Conclusion:

In this lab, the chloride concentration in a water sample was successfully determined using a titration method with silver nitrate solution. The results obtained can be used for water quality assessment and further analysis. It is important to follow proper laboratory techniques and precautions while performing this experiment.

Explanation:

Answer:

A positive charge of +1

Explanation:

The charge carried by atom depends on the number of protons and electrons present. The neutrons are not charged hence they do not contribute to the net charge of the specie.

The specie mentioned in the question has six protons and five electrons. Hence it has an excess of one positive charge hence a net charge of +1.

ANSWER:

ABCDFGHIJKLMNOPQRSTXYZ

To determine the number of moles, we look up in the periodic table the atomic weight of chromium, this is equal to 55.9961g/mol. And we apply the following relation:

There are 1.6 moles of Cr in 92.3g sample

The volume of water is 17 L

The volume of CO2 is 12 L

Stoichiometry is the calculation of the quantities of reactants and products in a chemical reaction. It involves balancing the chemical equation, determining the moles of reactants and products, and using mole ratios to find the desired quantities.

We have that;

Number of moles of oxygen = 62.3 g/32 g/mol

= 1.9 moles

If 5 moles of oxygen produces 44.8 L of water

1.9 moles of oxygen will produce 1.9 * 44.8/5

= 17 L

Number of moles of CO = 15 g/28 g/mol

= 0.54 moles

Volume of the CO2 = 0.54 moles * 22.4 L

= 12 L

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Answer:

In a blast furnace, the carbon fuel will be oxidized before the metal in the oxide is reduced. The metal in the oxide is then reduced by carbon monoxide and the product of the reaction will be metal and carbon dioxide.

Explanation:

Answer:

A, drawing a conclusion

Explanation:

To calculate the moles of H+ and OH-, you need to know the concentration of the solution in terms of its pH or pOH value.

When you get the pH of the solution, you can use this formula to calculate the concentration of H+ ions: [H+] = 10^(-pH)

Also, if you know the pOH of the solution, you can use this formula to calculate the concentration of OH- ions: [OH-] = 10^(-pOH)

Having determined the concentration of H+ and OH- ions, the molarity formula can be used to calculate the number of moles of each ion as follows: moles = concentration (in mol/L) x volume (in L)

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Among the alkaline earth metals, beryllium (Be) has the fewest number of occupied electron shells.

The alkaline earth metals are a group of chemical elements in the periodic table that include beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra).

Among the alkaline earth metals, beryllium (Be) has the fewest number of occupied electron shells. Beryllium has an electron configuration of 1s2 2s2, meaning it has only two occupied electron shells: the first shell, which can hold up to two electrons, and the second shell, which can hold up to eight electrons. In contrast, the other alkaline earth metals have at least three occupied electron shells. For example, magnesium has an electron configuration of 1s2 2s2 2p6 3s2, meaning it has three occupied electron shells.

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We need 1 mole of Ca(OH)2 for every 2 moles of HCl since Ca(OH)2 is a need for every 2 moles of HCl. Because HCl is in excess and Ca(OH)2 is the limiting reactant in this reaction, 2.0 moles of H2O should theoretically be created.

The stoichiometric coefficients can be used to calculate the excess reagent. Calcium hydroxide and HCl have stoichiometric coefficients of 1 and 2, respectively. Thus, HCl is the reaction's limiting reagent.

The redox reaction Ca+2H2OCa(OH)2+H2 is an illustration of this.

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