Need help on my Counting Atoms Worksheet

Explanation:

1.The gas law that we will use to solve this problem is the combined gas law.

2.We will choose the combined gas law because there are three variables that are changing in this problem: volume, pressure, and temperature.

3The volume is decreasing in this problem, from 1.74 L to 1.56 L.

The unknown that we are solving for is T2, the temperature at which the balloon will have a volume of 1.56 L.

4We will use the temperature in Kelvin for our calculations. To convert from Celsius to Kelvin, we add 273.15 to the Celsius temperature. Therefore, the temperature we will use in our calculations is 293.35 K (20.2°C + 273.15).

5To find the final temperature, we can use the combined gas law equation:

(P1 x V1)/T1 = (P2 x V2)/T2

where P1 = 1.02 atm, V1 = 1.74 L, T1 = 293.35 K, P2 = 0.980 atm, and V2 = 1.56 L.

Substituting the values into the equation and solving for T2, we get:

T2 = (P2 x V2 x T1)/(P1 x V1)

= (0.980 atm x 1.56 L x 293.35 K)/(1.02 atm x 1.74 L)

= 268.06 K

Therefore, the final temperature after the volume and pressure decrease is 268.06 K, which is approximately 253 K (option A).

From the solution that we have in the question;

The equilibrium constant, denoted as K, is a value that quantitatively represents the ratio of the concentrations of products to reactants at equilibrium in a chemical reaction.

It is a fundamental concept in chemical equilibrium.

The value of the equilibrium constant provides valuable information about the position of equilibrium and the relative concentrations of species involved in a chemical reaction.

Kc = [X] [Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\)

\(0.25(0.5 - x) = (0.1 + x)^2\)

\(0.125 - 0.25x =0.01 + 0.2x + x^2\\ x^2 + 0.45x - 0.115 = 0\)

x = 0.18 M

The equilibrium amount of X and Y=  0.28 M and the equilibrium concentration of XY = 0.32 M

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Based on the answer to the question that we have;

The ratio of the product to reactant concentrations in a chemical reaction at equilibrium is represented quantitatively by the equilibrium constant, abbreviated as K.

It is a cornerstone of the theory of chemical equilibrium.

A chemical reaction's equilibrium position and the relative concentrations of the species involved can both be learned from the equilibrium constant's value.

Kc = [X][Y]/[XY]

\(0.25 = (0.1 + x)^2/(0.5 - x)\\0.25(0.5 - x) = (0.1 +x)^2\\0.125 - 0.25x = 0.01 +0.2x +x^2\\= 0.18 M\)

The equilibrium concentration of;

XY =0.5 - 0.18

=0.32 M

Then the equilibrium amount of

X and Y is

0.1 + 0.18= 0.28 M.

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Based on the instructions given, it appears that the electric current will cause iodine to be released from the potassium iodide solution and create a dark blue mark on the cloth. The pattern that is formed will depend on the specific movements of the wire across the cloth.

As for the type of current being used, it is not specified in the instructions. However, it is likely that a direct current (DC) is being used, as the wires are connected to the positive and negative terminals of a power source.

The purpose of using a thick solution of cornstarch and water mixed with potassium iodide is to create a medium that can conduct electricity and produce a visible reaction when an electric current is passed through it. The potassium iodide in the solution reacts with the electricity to produce a dark blue mark.

The kind of current used in the experiment described is an electric current. When the electric current is passed through the solution of cornstarch and water mixed with potassium iodide, it frees the iodine from the potassium iodide, creating a visible reaction.

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Answer:  When I did the first part of the experiment, the dark blue marks basically followed where I drew with the wire--kind of like a weird pencil.  There wasn't another pattern that went with it.  

It created a DC current.

Explanation:   Where you touch with the wire attached to the positive pole of the battery, you complete the circuit with the pan, which is attached to the negative pole of the battery.  The electric current frees the iodine where the circuit is completed, which is what makes the marks.

(NOTE:  On my worksheet, there was a second part of this experiment with a low voltage bell transformer.  You probably shouldn't do that part.  My dad works for a power company, and here's what he said:

A bell transformer is typically a 115V AC to 15V AC step down transformer.  It’s not something normally found around the house.  They are designed to be hard-wired into a home's electrical system, and then wired to a doorbell.  A student would have to order one from Amazon (or purchase it at an electronics or hardware store). They would then need to purchase a 3 wire power cord, strip the wires, and either solder the power cord onto the transformer or use wire nuts to connect it. All the normal warnings regarding high voltage wiring would apply - ensuring the corresponding hot legs and neutral were appropriately matched, ensuring that the correct side of the transformer was wired to plug, ensuring no wires were exposed and there was proper insulation, etc.  Once that was complete, the student could plug the transformer into an electrical outlet and use the low voltage AC side to conduct their experiment.  

Unfortunately, none of that is in the instructions.  The inference from the instructions most people will take, is that somehow the 9 volt battery is powering the transformer to produce AC. I imagine this could be considerably frustrating, and will likely lead to step 5 producing no results.  Which may, frankly, lead to less liability than explaining what is needed to produce the results the experiment expects.)

Answer:

I believe the answer is Krypton.

Explanation:

I think it's krypton because usually, the number of electrons gives you the number of protons which can be used to find the atomic number.

Hope that helps!

The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

Explanation:

The measure of energy used in electrochemistry is the cell potential (ecell), which is the difference in electrical potential between two electrodes. A common term for this difference in electrical potential is voltage or emf.

The mass of the aluminum sample is 52 g.

The mass of the aluminum is determined by applying the principle of conservation of energy as shown below.

heat lost by aluminum = heat gained by water

m₁c₁Δθ₁ = m₂c₂Δθ₂

where;

m₁(0.897)(93.2 - 17.8) = (300)(4.186)(17.8 - 15)

m₁(0.897)(75.4) = (300)(4.186)(2.8)

67.634m₁ = 3516.24

m₁ = 3516.24/67.634

m₁ = 52 g

Thus, the mass of the aluminum sample is 52 g.

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Answer:

NH3

Explanation:

The "tri" attached to the trihydride means 3. So your hydrogen is going to have 3 atoms.

Answer:

All Answers only for the elite; Nomenclature of Covalent Compounds Quiz

You're Welcome :)

Explanation:

A-hydrochloric acid

B-sulfuric acid

C-dinitrogen pentoxide

C- IBr3

A- carbon dioxide

B- Start the name with hydro-.

B- H3BO3

C-sulfur trioxide

A- NH3

B- The chemical name ends with “hydroxide.”

Explanation:

your answer willing be 8.7

Answer:

18.1 g

Explanation:

Step 1: Write the balanced equation

CaO + 3 C ⇒ CaC₂ + CO

Step 2: Calculate the moles corresponding to 10.2 g of C

The molar mass of C is 12.01 g/mol.

10.2 g × 1 mol/12.01 g = 0.849 mol

Step 3: Calculate the moles of CaC₂ produced from 0.849 moles of C

The molar ratio of C to CaC₂ is 3:1. The moles of CaC₂ produced are 1/3 × 0.849 mol = 0.283 mol

Step 4: Calculate the mass corresponding to 0.283 moles of CaC₂

The molar mass of CaC₂ is 64.10 g/mol.

0.283 mol × 64.10 g/mol = 18.1 g

Answer

C. A reddish-brown precipitate forms on the bottom of the beaker.

Explanation

2 Al + 3 CuCl2 -----> 3 Cu +2 AlCl3

All the observations in the options would support that this chemical reaction has occurred EXCEPT

C. A reddish-brown precipitate forms on the bottom of the beaker.

This is because the color of the AlCl3 in the solution formed is colorless. The color of CuCl2 when stirred and dissolved in the liquid is blue and as the aluminum reacts with it, the color changes to a colorless as AlCl3 is formed and consequently, the amount of Al decreases over time.

Answer:

convalent???????

Explanation:

sowwy if it wrong

it's the third one The chemical equation will have two arrows pointing in different directions. !

Answer:

the answer is option 1 2H2+O2

If two liquid solutions are mixed together, the solute would be the one with the lower volume while the solvent would be the solution with the higher volume.

The mixing of two liquids requires that one is a solute while the other is a solvent.

Thus, the solution with the higher volume acts as the solvent while the one with the lower volume act as the solute.

For example, a solution made by mixing 25% water with 75% alcohol has water as the solute and alcohol as the solvent.

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Among the given options the compound with the formula C₃H₈ is option C. It is an organic compound under named as propane.

What is propane?

Propane is an organic compound classified as a hydrocarbon  with saturated carbon - hydrogen bonds. It's formula is C₃H₈. It contains 3 carbons and 8 hydrogens.

The two end carbons contains 3 hydrogens each and the middle carbon contains 2 hydrogens. They are all bonded through sigma bonding. The compound in A is C₅H₁₂ and in B, it is C₆H₁₄.

The formula of the compound in option D is C₅H₁₀. Hence, the skeleton showing the compound with the formula of C₃H₈ is option C.

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Answer:

Z: 495

Z+1: 1313

Z+2: 1402

Z+3: 1681

Z+4: 2081

Explanation:

The attached shows that ionization energy increases up and to the right. If we have five consecutive elements then that means as we increase the atomic number we are moving to the right and therefore increasing ionization energy.

The conversion of 0.00130 g F-/kg  of seawater results to 130 ppm.

To convert from grams per kilogram (g/kg) to a different unit, you need to know the conversion factor to that unit. Here are some common units and their conversion factors.

To convert from grams per kilogram to parts per million (ppm), you can use the following conversion factor:

1 g/kg = 1,000,000 ppm

So, to convert 0.00130 g F-/kg seawater to ppm:

0.00130 g F-/kg x (1,000,000 ppm / 1 g/kg) = 130 ppm

Therefore, 0.00130 g F-/kg seawater is equivalent to 130 ppm.

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Answer:

It cannot be both, because the heat released or absorbed is also equal to the difference in total heat content of the reactants and products. So, it cannot be both.

Answer:

B

Explanation:

Answer:

8

Explanation:

The values of q = 0, ΔT = 50K, w= ΔU = 509.23J.

Adiabatic expansion is defined as the expansion in which there is no heat interaction of the system with the surroundings and work is done by the system at the expense of its internal energy.

Given,

Mass of Xe = 65g

Initial Pressure = 2 atm

T = 298K

Final pressure = 1 atm

Moles of Xe = mass ÷ molar mass

                    = 65 ÷ 131 = 0.49 moles

Since it is adiabatic, q = 0

Δ U = w

Cv = 5/2 R

nCv (T₂ - T₁) = \(\frac{nRT_{2} }{P_{2} }\) - \(\frac{nRT_{1} }{P_{1} }\)

Substituting the values as above, we get,

T₂ = 249 K

ΔT = 298 - 248 = 50K

ΔU = w = n Cv ΔT

= 0.49 × 20. 78 × 50

= 509.23 J

Therefore, the values of q = 0, ΔT = 50K, w= ΔU = 509.23J.

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Answer:

Chronic diseases are defined broadly as conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living or both. Chronic diseases such as heart disease, cancer, and diabetes

Answer:

conditions that last 1 year or more and require ongoing medical attention or limit activities of daily living

Explanation:

Answer:

2H²+O²--> 2H²O (sry subscripts can't be written on moblie)

Explanation:

the first part of the reaction shows 4 hydrogen atoms and 2 oxygen atoms, and the second formula shows the same

The freezing point of the solution containing 0.867 m glycerin is -1.61442 °C. Option C is correct

The mass of glucose in 505 mL of 10.5% glucose solution is 53.01 g or 5.30 x 10^2 g.

Option C is correct

To find the freezing point depression of the solution containing 0.867 m glycerin:

ΔTf = Kf * molality

ΔTf = (1.86°C/m) * 0.867 m

ΔTf = 1.61442 °C

The freezing point depression is 1.61442 °C.

The freezing point of the solution is:

Freezing point = 0.0 °C - ΔTf

Freezing point = 0.0 °C - 1.61442 °C

Freezing point = -1.61442 °C

To find the mass of glucose in 505 mL of 10.5% glucose solution:

Mass of glucose = Volume of solution * Density of solution * % mass

Mass of glucose = 505 mL * 1.04 g/mL * 10.5%

Mass of glucose = 53.01 g

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Answer: Various aspects have various ranges cause they have various numbers of protons, and various numbers and plans of electrons.

Explanation:

Answer: A property closely related to an atom's mass number is its atomic mass. The atomic mass of a single atom is simply its total mass and is typically expressed in atomic mass units or amu. By definition, an atom of carbon with six neutrons, carbon-12, has an atomic mass of 12 amu.

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Approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M.

To determine the mass of glucose (C6H12O6) required to prepare a 0.215 M solution in 5000 mL, we need to use the formula:

Molarity (M) = moles of solute / volume of solution (in liters)

First, let's convert the volume of the solution from milliliters (mL) to liters (L):

5000 mL = 5000/1000 = 5 L

Now, we can rearrange the formula to solve for moles of solute:

moles of solute = Molarity (M) x volume of solution (L)

moles of solute = 0.215 M x 5 Lmoles of solute = 1.075 mol

Since glucose (C6H12O6) has a molar mass of approximately 180.16 g/mol, we can calculate the mass of glucose using the equation:

mass of solute = moles of solute x molar mass of solute

mass of glucose = 1.075 mol x 180.16 g/mol

mass of glucose = 194.0 g (rounded to three significant figures)

Therefore, approximately 194.0 grams of glucose (C6H12O6) would be required to prepare a 5000 mL solution with a concentration of 0.215 M. It's important to note that the molar mass of glucose used in this calculation may vary slightly depending on the level of precision required.

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Answer:

Pure substances are further broken down into elements and compounds. ... A mixture is composed of different types of atoms or molecules that are not chemically bonded. substance A form of matter that has constant chemical composition and ... of atom and cannot be broken down or transformed by a chemical reaction.

Explanation:

Answer:

so 0.71 g/L

Explanation:

C =n/v n= to 0.355

v= 0.500L

The concentration of Na⁺ ions in the dilutes solution of 0.500 L is 0.131 molar.

Molarity is a concertation term for solutions. Mathematically it is the ratio of no. of moles of solute to the volume of solution in liter.

Molarity = (no.of moles / volume of solution in L)

Given that the volume of NaCl is 0.185 L and have a concentration of 0.355 M. The solution is diluted to 0.500 L , then the new concentration is calculated as follows:

M1 V1 = M2V2

(0.185 L × 0.355 M) = (0.500 L × M2), where M2 have to be calculated.

M2 = (0.185 × 0.355)/0.500 = 0.131 M

The concentration of Na⁺ will be one times the concentration of NaCl. Since the no.of moles of sodium ions and chloride ions are equal there.

Therefore, the concentration of sodium ions is 0.131 M.

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