The reaction in which methane is burned, CH4 +202 --> 2H20 + CO2, is an example of a
combustion reaction
O synthesis reaction
O decomposition reaction
O precipitate reaction

Answer:

Explanation:

When workers stop working entirely, it is called either a strike or retirement, depending on the circumstances under which it is done.  A strike is a mass refusal of employees to work, because they are not satisfied.  

Retirement on the other hand happens when the employee reaches certain age, after which he/she can leave the job and get a pension,.

The scatter plot is a graph that shows the relationship between two variables. In this case, the x-axis represents the date, and the y-axis represents the number of customers without power.

The scale on the x-axis could be labeled with the dates from Sept. 6 to Sept. 13, and the scale on the y-axis could be labeled with increments of 200,000 or 250,000 to accommodate the data range. The title for the x-axis could be "Date" and for the y-axis could be "Number of Customers Without Power." To find the linear regression model that fits the data, we can use the method of least squares. The equation for the line of best fit would be: y = mx + b, where y represents the number of customers without power and x represents the date. By analyzing the data, we can find the slope (m) and the y-intercept (b) values. To sketch the scatter plot with the line superimposed over the data, we would plot each data point as a dot on the graph. Then, we would draw the line of best fit using the linear regression equation we found in step 2. The scale on the x-axis and y-axis would remain the same as mentioned in step 1.

The slope of the line represents the rate of change in the number of customers without power per day. In this case, it indicates how many customers were getting their power restored each day on average. The y-intercept represents the initial number of customers without power on the first day of the data set. To forecast the number of customers without power on September 16, we would use the linear regression equation from step 2 and substitute the date (x) as September 16. This would give us the predicted value for that date. The goodness of fit of the line can be evaluated by calculating the coefficient of determination (R-squared value). This value ranges from 0 to 1 and represents the proportion of the variation in the dependent variable (number of customers without power) that can be explained by the independent variable (date). A higher R-squared value indicates a better fit of the line to the data.

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The density of the substance having a mass of 2.0 g is 0.4 g/mL (Option D)

First, we shall obtain the volume of the substance. This can be obtained as follow:

Volume of substance = (Volume of water + substance) - (Volume of water)

Volume of substance = 75 - 70

Volume of substance = 5 mL

Finally, we shall determine the density of the substance. This is illustrated below:

Density = mass / volume

Density of substance = 2 / 5

Density of substance = 0.4 g/mL

Thus, the density is 0.4 g/mL (Option D)

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4.2 × 10^14 J will be the energy released by the fusion of a 1.25 -kg mixture of deuterium and tritium, which produces helium.

Emitted energy in the reaction will be

E = (1876.136 + 2809.45) (3728.42 +939.565)

E =017.6 Mev

Now total atomic bar weight A = (2+3) = 5 grams

total no of atoms = 2Na

for 1-25 kg

= (2Na/5)X1250

= (2x6.023×10^23/5)*1250

= 3.0115×10^26

In Joules released energy in fusion a 1.25kg mixture of denterium and trilium will be

Q = 2.65 × 10^33 × 1-6 × 10^-19 J

   = 4.2 × 10^14 J

the energy released by the fusion deuterium and tritium is 4.2 × 10^14 J.

the complete question is:

The atomic masses of deuterium and tritium are 2.014102 u and 3.016049 u respectively. Calculate the energy in joules released by the fusion of a 1.25 -kg mixture of deuterium and tritium, which produces helium. There are equal numbers of deuterium and tritium nuclei in the mixture

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The red diamond tells how flammable the chemical compound is or how easily it catches fire.

The yellow diamond tells about reactivity how quickly the compound reacts with other materials.

Answer:

james Chadwick discovered it

Explanation:

The pH of a substance can be found by using the formula

\(pH = - log[ H^{ + } ]\)

where [ H+ ] is the hydrogen ion concentration in the substance

From the question

[ H+ ] = 2.1 × 10-¹² M

To find the pH substitute the value into the above formula

We have

\(pH = - log(2.1 \times {10}^{ - 12} ) \\ = 11.6777807 \: \: \: \: \: \: \)

We have the answer as

The solution is basic since it lies in the basic region that is from 8 to 14

Hope this helps you

Answer:

0.8833 mole of C3H8

Explanation:

Given:

Mass of C₃H₈ (Propane) = 38.95 gram

Computation:

Molar mass of C = 12.01

Molar mass of H = 1.008

Molar mass of C₃H₈ (Propane) = 3(12.01) + 8(1.008)

Molar mass of C₃H₈ (Propane) = 36.03 + 8.064

Molar mass of C₃H₈ (Propane) = 44.094

Number of mol in 38.95 gram Propane = Mass / Molar mass

Number of mol in 38.95 gram Propane = 38.95 / 44.094

Number of mol in 38.95 gram Propane = 0.88334

Answer:

Use the Periodic Table to find molar masses.

Propane (C3H8), a common fuel, reacts with oxygen to form carbon dioxide and water according to the equation below:

C3H8 + 5O2 → 3CO2 + 4H2O

If a propane heater burns 38.95 g C3H8, it consumes

38.95 mol C3H8.

0.8830 mol C3H8.

1 mol C3H8.

44.10 mol C3H8.

Part 2

How many moles of oxygen are required to produce 37.15 g CO2?

37.15 g CO2 = 1.407 mol O2

Part 3

What mass of propane is necessary to react with the amount of oxygen calculated in the previous question?

12.41   g C3H8    

A chemical alteration has occurred. A new material, cottage cheese, with distinct qualities from the original milk and vinegar is produced when the acid in the vinegar and the proteins in the milk react.

The change described is a chemical change. When vinegar, which is an acid, is combined with milk, a reaction occurs between the acid and the proteins in the milk. This reaction causes the milk to sour and thickens, resulting in the formation of cottage cheese. This change cannot be easily reversed, and the resulting cottage cheese is a new substance with different properties than the original milk and vinegar. This is a chemical change because the molecules in the milk and vinegar are rearranged to form a new substance, which has different chemical and physical properties than the original substances. This process is different from a physical change, such as melting ice, which does not result in the formation of a new substance.

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The most likely cause of earthquakes that occur in the area shown on the map is due to fault lines in the earth's crust.

Earthquakes are natural phenomena characterized by the shaking or trembling of the Earth's surface.

They occur due to the sudden release of energy in the Earth's crust along fault lines, which creates seismic waves that propagate through the Earth.

The Earth's crust is composed of several large tectonic plates that float on the semi-fluid layer of the Earth's mantle.

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The estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

Molar mass of water, M = 18g/molDensity of water, ρ = 1g/cm³ = 1000kg/m³The number of molecules per unit surface area of water can be estimated as follows:Number of water molecules per unit volume of water = Avogadro's number, NA / MNumber of water molecules per unit volume of water = 6.022 × 10²³ / 18 = 3.345 × 10²² / molThe number of molecules per unit surface area of water = the number of molecules per unit volume of water × the thickness of the water layer on the surface= 3.345 × 10²² / m³ × 1 × 10⁻⁸ m= 3.345 × 10¹⁴ / m²b)Given:Coordination number of water, CN = 4Binding energy of hydrogen bond, E = 10⁻²⁰ JThe surface tension of water, γ water = 0.072 N/mEnergy required to bring one molecule from the bulk of the liquid to the surface of the liquid, ΔE= γ water × AThe total binding energy of a water molecule in the liquid state = the binding energy of one hydrogen bond × the coordination number= 10⁻²⁰ J/bond × 4 bonds = 4 × 10⁻²⁰ JThe number of molecules per unit surface area of water = the energy required to bring one molecule from the bulk of the liquid to the surface of the liquid / the total binding energy of a water molecule in the liquid state= ΔE / 4 × 10⁻²⁰= 0.072 / (4 × 10⁻²⁰)= 1.8 × 10²⁰The surface tension of water can also be expressed as follows:γ water = (N / A) × EThe number of hydrogen bonds per unit area, N / A = γ water / E= 0.072 / 10⁻²⁰ = 7.2 × 10¹⁸ / m²The difference between the estimated value and the observed value is relatively large (about a factor of 25). It is because this is just an estimate, and it does not consider all the factors affecting the surface tension of water. However, the estimate is still useful because it provides insight into the behavior of water molecules at the surface of the liquid.

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Answer:

The chemical would not be a replacement for sodium azide

Explanation:

Sodium azide, NaN₃, in air bags in cars decomposes when caused to explode by an electrical charge that is triggered during a collision according to the following chemical reaction

2 NaN₃ (s) → 2 Na (l) + 3 N₂ (g)

The time it takes the air bag to fill with NaN₃ = 0.030 seconds

The rate of decomposition of the chemical found to replace sodium azide = Slowly

The chemical will not be a good replacement for sodium azide due to the time sensitive nature of the filling of the sir bag so as to save lives

There will not be enough time for the airbag to fill and cushion the effect of the impact of a collision on the passengers of a vehicle when the new chemical is used as a serious collision takes place in a fraction of a second

Answer:

1) mixture of elements

2) single compound

3) mixture of elements and compounds

Explanation:

1) there are two different elements in the diagram, which are not chemically combined together, so they are a mixture

2) two elements chemically combined together

3) there are different elements and compounds present

The partial pressure in atm of O2 is 0.47 atm

What do you mean by moles?

A mole is simply a unit of measurement. In fact, it's one of the seven base units in the International System of Units (SI). Units are invented when existing units are inadequate. Chemical reactions often take place at levels where using grams wouldn't make sense, yet using absolute numbers of atoms/molecules/ions would be confusing, too. So, scientists invented the mole to bridge the gap between very small and very large numbers.

No. of moles of Rn = 0.220 moles

No. of moles of O2 = 0.350 moles

No. of moles of Ar = 0.640 moles

Total no. of moles = 1.21 moles

Mole fraction of O2 , xO2 = 0.350moles  / 1.21 moles = 0.289

Total pressure = 1.65 atm

Partial Pressure of O2 = Mole fraction of O2* Total Pressure

                                    = 0.289 * 1.65 atm

                                    = 0.47 atm

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The molar mass of citric acid (c6h8o7) is 192.124g/mol

The molar mass of baking soda (nahco3) is 84.007g/mol

The molar mass of a chemical compound is defined as the mass of a sample of that compound divided by the amount of substance in that sample and is measured in moles. Molar mass is a mass property, not a molecular property of a substance.

Molar mass is the mass of 1 mole of the sample. To find the molar mass, add up the atomic masses (atomic weights) of all the atoms in the molecule. Use the masses listed in the periodic table or atomic weight table to determine the atomic mass of each element.

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The molar mass of citric acid (C6H8O7) : 192.12 g/mol

The molar mass of citric acid (C6H8O7) : 84.007 g/mol

Baking soda is a monosodium salt of carbonic acid with alkalizing and electrolyte substitution properties. When dissociated, baking soda forms sodium and bicarbonate ions. Ion formation increases plasma bicarbonate and buffers excess hydrogen ion concentration, resulting in an increase in blood pH.

Citric acid is a naturally occurring weak acid in all citrus fruits. If you've ever sunk your teeth in a lemon, you've tasted citric acid. Manufacturers add artificial versions of it to processed foods. Drugs containing citric acid treat health problems such as kidney stones.

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At 25 ∘C, the calculated value of ΔG∘ for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) is 138.4 kJ/mol. Since ΔG∘ is positive, the reaction is non-spontaneous under standard conditions at this temperature. A positive ΔG∘ indicates that the reaction requires energy input to occur.

To calculate ΔG∘ at 25 ∘C for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) using standard free energies of formation, we need to subtract the sum of the standard free energies of formation of the reactants from the sum of the standard free energies of formation of the products.

The standard free energies of formation for the given compounds at 25 ∘C can be looked up in reference tables. The values are as follows:

ΔG∘f(H2(g)) = 0 kJ/mol

ΔG∘f(Fe2O3(s)) = -824.2 kJ/mol

ΔG∘f(Fe(s)) = 0 kJ/mol

ΔG∘f(H2O(g)) = -228.6 kJ/mol

Using these values, we can calculate ΔG∘ for the reaction:

ΔG∘ = (2 * ΔG∘f(Fe(s)) + 3 * ΔG∘f(H2O(g))) - (3 * ΔG∘f(H2(g)) + ΔG∘f(Fe2O3(s)))

ΔG∘ = (2 * 0 kJ/mol + 3 * (-228.6 kJ/mol)) - (3 * 0 kJ/mol + (-824.2 kJ/mol))

ΔG∘ = -685.8 kJ/mol + 824.2 kJ/mol

ΔG∘ = 138.4 kJ/mol

At 25 ∘C, the calculated value of ΔG∘ for the reaction 3H2(g) + Fe2O3(s) -> 2Fe(s) + 3H2O(g) is 138.4 kJ/mol. Since ΔG∘ is positive, the reaction is non-spontaneous under standard conditions at this temperature. A positive ΔG∘ indicates that the reaction requires energy input to occur.

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Answer:

According to Kinetic Molecular Theory, an increase in temperature will increase the average kinetic energy of the molecules. As the particles move faster, they will likely hit the edge of the container more often. If the reaction is kept at constant pressure, they must stay farther apart, and an increase in volume will compensate for the increase in particle collision with the surface of the container.

Explanation:

Answer:

Explanation:

4.5x10x10x10x10x10 can be written as 4.5^5, by the way.

The sum of 4.5^5 is 450,000.

450,000 divided by 300 is 1500.

Hope this helps!

Explanation:

4.5×10×10×10×+0×10=4500000

450000÷300

remove zeros

4500÷3

=1500

Answer:

Freezing or boiling water

The experiment would not function properly if the copper electrodes were totally submerged in water because then there would be no way for the electrical current to travel through the solution.

If the copper electrodes were completely covered by water, the electrical current would not be able to pass through the solution, and the experiment would not work properly. As a result, no reduction or oxidation reaction would occur, and the electrochemical cell would not produce any voltage or current.

This would be visible in the readings as a flat line or zero voltage or current reading on the voltmeter or ammeter. Additionally, the copper electrodes could corrode or dissolve in water over time, leading to inaccurate readings or a loss of the electrodes altogether.

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A pollutant decays with a first order rate constant of 0.726 min⁻¹ . The half life of the pollutant will be 0.95 minutes.

Half -life of a chemical reaction is defined as , " the time taken for the concentration of a given reactant to reach half or 50% of its initial concentration" .

Half life of a first order reaction is given as

t(1/2) = 0.693/ K

where K is the rate constant.

given,

here, rate constant is k= 0.726 min⁻¹

therefore, half life of the pollutant:

t(1/2) = 0.693/ 0.726 min⁻¹

t(1/2) =0.95 min

Thus, the half-life of the pollutant is 0.95 minutes

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The value of ΔH for the given thermochemical equation Cl2 (g) + Al2O3 (s) → AlCl3 (s) + O2 (g) is -176.3 kJ.

To determine the value of ΔH for the given thermochemical equation, we can use the concept of Hess's Law. According to Hess's Law, the overall enthalpy change for a reaction is equal to the sum of the enthalpy changes of the individual steps involved.

In this case, we can rearrange the given equation to match the reactants and products of the balanced equation provided. By reversing the direction of the given equation, we can determine that the enthalpy change is the negative of the given value, -264.5 kJ.

Since the given equation involves the same reactants and products as the balanced equation, the ΔH value for the equation Cl2 (g) + Al2O3 (s) → AlCl3 (s) + O2 (g) is -176.3 kJ, which is the negative of -264.5 kJ.


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decay rate of approximately 1.69x10^17 Bq (becquerels),

The decay rate of a radioactive sample is determined by the number  of radioactive atoms present and the decay constant, which represents the probability of decay per unit of time.

To calculate the decay rate, we multiply the number of atoms in the sample by the decay constant. In this case, the sample has 8.31x10^17 atoms and a decay constant of 0.203/s. Multiplying these values gives a decay rate of approximately 1.69x10^17 Bq (becquerels), which represents the number of decays per second in the sample.

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The mass percent of the solution is approximately 10.51%.

To calculate the mass percent of the solution, we need to determine the total mass of the solution.

The mass of the solution can be calculated using the density and volume of the solution:

Mass of the solution = Density × Volume

Mass of the solution = 1.06 g/ml × 895 ml

Mass of the solution = 948.7 g

The mass percent of the solution can be calculated by dividing the mass of the solute (CSI) by the mass of the solution and multiplying by 100:

Mass percent = (Mass of CSI / Mass of the solution) × 100

Mass percent = (99.7 g / 948.7 g) × 100

Mass percent ≈ 10.51%

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Answer:

I believe its A. Mass

Explanation:

An intensive property is a property of matter that depends only on the type of matter in a sample and not on the amount. For example, the electrical conductivity of a pure substance is a property that depends only on the type of substance. Silver, gold, and copper are excellent conductors of electricity, while glass and plastic are poor conductors.. Other intensive properties include color, temperature, density, and solubility.

Answer:

B. Magnetism

Explanation:

Hope this helps! :))
Sorry for late answer

A debate among scientists on how new species form is based on speciation.

Divergence explains how organisms on Earth are related because it shows how species are similar or different.

Genes play the role in diversity of carrying information that results in changes from one generation to the next.

Natural selection is part of evolution because it explains why attributes are either in existence or have gone extinct.

One of the main debates among scientists on how new species form centers around the concept of speciation. There are two main hypotheses for speciation: allopatric speciation and sympatric speciation.

Divergence is the process by which different populations or species of organisms evolve from a common ancestor over time. This process is responsible for the diversity of life on Earth. By studying the similarities and differences between different organisms, scientists can infer evolutionary relationships.

Genes are the basic units of inheritance that carry information from one generation to the next. They play a crucial role in creating diversity among organisms. The genetic diversity of a population is the result of mutations, gene flow, and genetic drift.

The theory of natural selection is one of the most important and widely accepted explanations for the diversity of life on Earth. It is the process by which certain traits become more or less common in a population over time, depending on their impact on the survival and reproduction of the organisms that possess them.

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Answer:

B both products are elements

Explanation:

The pale green substance is likely to be chlorine gas, which is an element, and the shiny grey solid is likely to be zinc metal, which is also an element.

As per the balanced reaction given, 4 moles of ammonia reacts with 6 moles of NO. Therefore, the number of moles of NO required to react with 2.45 moles of ammonia is 3.46.

Nitric oxide is a covalent compound formed from the electron sharing between nitrogen and oxygen atom. Nitric oxide is a common gas found in atmosphere.

NO reacts with ammonia gas produces nitrogen gas and water as per the balanced chemical equation given. It is clear that 4 moles of ammonia reacts with 6 moles of NO.

The number of moles of NO required to react with 2.45 moles of ammonia is calculated as follows:

number of moles of NO  = 2.45 × 6 /4 = 3.46.

Therefore, 3.46 moles of NO is required to completely react with 2.45 moles of ammonia.

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Learn the concentration and beginning rate in order to determine the correct number of significant digits. The starting rate of reaction is 98.0 m/s at a specific concentration of h2 and i2.

What, using an example, is concentration?

1) Percent Concentration:

The amount of solute that completely dissolves in 100 g of solvent. We know that there are 20 g of solute in 100 g of solution if the solution's concentration is 20 percent. Example: The solution is made by combining 10 g of salt with 70 g of water. Find the solution's concentration using mass percent.

What would you say about concentration?

The amount of solute contained in a specific amount of solution is the substance's concentration. Typically, concentrations are described in terms of molarity, which is the number of

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