Which of the following equations is a balanced chemical equation:
2HCl(aq) + Ca(OH)2(aq) → CaCl₂(aq) + 2H₂O(l)
HCl(aq) + Ca(OH)₂(aq) → CaCl₂(aq) + H₂O(l)
HCl(aq) + 2Ca(OH)₂(aq) → 2CaCl₂(aq) + 4H₂O(l)

Answer: The thermal energy is spread out by the surrounding air.

Explanation:

got it right on test

Answer:

Explanation:

Here, we want to get the value of the pressure in atm

Mathematically, we can use the ideal gas equation for this

This is calculated as follows:

where n is the number of moles which is given as 0.25

R is the molar gas constant which is 0.082

T is the temperature, given as 300K

V is the volume, given as 4L

Substituting these values, we have it that:

Water is the best insulator because it has the greatest specific heat capacity and all other substances have low specific heat than the water.

The term specific heat capacity is defined as the amount of heat in joules required to increase the temperature of one gram of a substance by one degree Celsius.

An insulator is a substance which conducts heat to a very miserable extent.

From the definition of specific heat capacity and insulator, we conclude that the higher the value of specific heat capacity, the harder it would be to heat up the material, that is, the more heat would be needed.

All the given substances, only water has the greatest specific heat capacity, therefore, it's the best insulator.

Gold is the best conductor, as it has the lowest specific heat capacity.

Thus, the best insulator is water.

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Your question is incomplete, most probably your question was

Table C: Known Specific Heat Values for Common

Materials

Material Specific Heat (J/g*C)

Water 4.18

Concrete 0.88

Wood 1.80

Aluminum 0.90

Glass 0.84

Sand 0.83

Steel 0.49

Iron 0.44

Copper 0.38

Lead 0.16

Gold 0.13

What is the best insulator and why?

Rounding to the appropriate number of significant figures, the equilibrium constant (Kc) for the reaction is approximately 1.66.

To calculate the equilibrium constant (Kc) for the given reaction, we can use the formula:

Kc = ([H2]^3 * [N2]) / [NH3]^2

Plugging in the given equilibrium concentrations, we have:

Kc = (0.470^3 * 0.800) / (0.250^2)

Calculating the numerator:

(0.470^3 * 0.800) = 0.1037032

Calculating the denominator:

(0.250^2) = 0.0625

Now, dividing the numerator by the denominator:

Kc = 0.1037032 / 0.0625 = 1.6592512

The equilibrium constant represents the ratio of the concentrations of products to reactants at equilibrium. In this case, the equilibrium constant is greater than 1, indicating that the products (H2 and N2) are favored at equilibrium. This means that the forward reaction is favored, leading to the formation of more products compared to reactants.The equilibrium constant value of 1.66 suggests that the forward reaction is moderately favored at equilibrium, but without additional context, it is difficult to determine the extent of the reaction or the relative concentrations of reactants and products at the beginning of the reaction.

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The mass of sodium chloride produced by the chemical reaction between sodium bicarbonate and hydrochloric acid is 8.37g.

The balanced chemical equation for the reaction between sodium bicarbonate (NaHCO₃) and hydrochloric acid (HCl):

NaHCO₃ + HCl → NaCl + H₂O + CO₂

1 mole of sodium bicarbonate (NaHCO3) reacts with 1 mole of hydrochloric acid (HCl) to produce 1 mole of sodium chloride (NaCl), 1 mole of water (H₂O), and 1 mole of carbon dioxide (CO₂).

NaCl: Molar mass = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

The number of moles of sodium bicarbonate (NaHCO₃) and hydrochloric acid (HCl) using their respective masses:

Number of moles of NaHCO₃ = Mass of NaHCO₃ / Molar mass of NaHCO₃

Number of moles of NaHCO₃ = 12 g / (22.99 g/mol + 1.01 g/mol + 48.00 g/mol + 16.00 g/mol)

Number of moles of NaHCO₃ = 12 g / 84.00 g/mol ≈ 0.143 moles

Number of moles of HCl = Mass of HCl / Molar mass of HCl

Number of moles of HCl = 5.58 g / (1.01 g/mol + 35.45 g/mol)

Number of moles of HCl = 5.58 g / 36.46 g/mol ≈ 0.153 moles

Since the reaction stoichiometry is 1:1 between NaHCO₃ and NaCl, the number of moles of NaCl produced will be the same as the number of moles of NaHCO₃ reacted. Therefore, the mass of NaCl produced can be calculated as follows:

Mass of NaCl produced = Number of moles of NaCl × Molar mass of NaCl

Mass of NaCl produced = 0.143 moles × 58.44 g/mol

The Mass of NaCl produced ≈ 8.37 g

Hence, the mass of sodium chloride produced is approximately 8.37 grams.

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ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.  Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials.

Remember that when a metal reacts with a nonmetal, often an ionic compound results from the transfer of electrons form the metal (the reductant) towards the nonmetal (the oxidant). Ionic compounds often have flat surfaces that meet at distinctive angles and are stiff, brittle, crystalline materials. They melt at rather high temperatures and are not easily distorted.   ΔLatticeU = ΔLatticeH – pΔVm is the lattice energy of wurtzite.

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The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A

In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).

When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.

Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.

In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.

The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A

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The wavelength of light that should be employed for nickel(II) ion is roughly 400–500 nm, according to the absorbance spectra displayed. This is due to the graph's observation of an absorbance peak with a maximum of roughly 0.8 in this region.

The plot of a substance's absorbance as a function of light wavelength is called the absorbance spectrum. The absorbance spectrum in this instance is for the nickel(II) ion.

The peak in absorbance shows that the nickel(II) ion's electrons are most easily moved from a lower energy state to a higher energy one by this particular wavelength of light. As a result, more light is absorbed, increasing the measured absorbance.

Depending on the particular experiment and the tools being used, a specific wavelength of light should be employed. However, judging by the absorbance spectrum displayed, measuring nickel(II) ion absorbance should be possible at a wavelength of roughly 400–500 nm.

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Answer:

The print is so little i cant read it. :( Sorry!

Explanation:

Answer:

A. The time required for half of a radioactive sample to decay.

Explanation:

Got it right on E2020 C:

Hope I could help!

The statement that describes a half-life is "The time required for half of a radioactive sample to decay."

The half-life of a quantity is the time it takes for it to decline to half of its original value. In terms of chemical reaction, the half-life is defined as the time it takes for the reactant concentration to reach half of its initial value. It is commonly represented in seconds and is symbolized by the sign 't 1/2'.

The time it takes for one-half of the atomic nuclei in a radioactive sample to decay in radioactivity.

Hence the correct option is the time required for half of a radioactive sample to decay.

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6. 1 \(SO_{3}\) + 1 \(H_{2}O\) --> 1 \(H_{2} SO_{4}\)

8. 1 \(K_{2}O\) + 1 \(H_{2}O\) --> 2 KOH

12. 1 \(CdSO_{4}\) + 1 \(H_{2} S\) --> 1 CdS + 1 \(H_{2} SO_{4}\)

According to the given reaction, one molecule of H2 reacts with one molecule of C2H4 to produce one molecule of C2H6.

In the reactants, there are 7 molecules of C2H4 and 3 molecules of H2, it means that 3 molecules of C2H4 react with the 3 molecules of H2 to form 3 molecules of C2H6, and 4 molecules of C2H4 will remain.

It means that you have to add 3 molecules of C2H6 and 4 molecules of C2H4.

Answer:

By size, Jupiter reigns supreme in our solar system. This gas giant has 11 times the diameter of Earth. Astronomers have spotted even larger gas giants, such as the exoplanet Kepler-7b, located 1,400 light years away from Earth.

In our solar system, Jupiter and Saturn are gas giants. These planets make Earth look tiny. The diameter of Jupiter is 11 times bigger than that of Earth, and Saturn’s is nine times bigger. Some people also include Uranus and Neptune in the gas giant category. They have a lot of hydrogen and helium in their atmospheres. But these planets also have water, methane and ammonia, and so NASA places them in their own group.

Astronomers have spotted gas giants outside our solar system. Like Jupiter and Saturn, they aren’t very dense. But they can be even bigger or hotter than our solar system’s gas giants.

Explanation:

Hope it helps

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\\)

From the question

mass = 57.5 g

density = 1.31 g/mL

We have

\(volume = \frac{57.5}{1.31} \\ = 43.89312977...\)

We have the final answer as

Hope this helps you

Sound travels fastest through solids.

it would be cold gasses because of how air at 0 is faster then at 100

Answer:

We do something called hypothesis

Answer:

1. Make an observation.

2. Ask a question.

3. Propose a hypothesis.

4. Make predictions.

5. Test the predictions.

6. Iterate.

and if it can't be trsted the you did something wrong

Explanation:

The scientific method

At the core of biology and other sciences lies a problem-solving approach called the scientific method. The scientific method has five basic steps, plus one feedback step:

Make an observation.

Ask a question.

Form a hypothesis, or testable explanation.

Make a prediction based on the hypothesis.

Test the prediction.

Iterate: use the results to make new hypotheses or predictions.

The scientific method is used in all sciences—including chemistry, physics, geology, and psychology. The scientists in these fields ask different questions and perform different tests. However, they use the same core approach to find answers that are logical and supported by evidence.

Scientific method example: Failure to toast

Let's build some intuition for the scientific method by applying its steps to a practical problem from everyday life.

An energy conversion is the change of energy from one form to another. An energy transfer is the movement of energy from one object to another.

Energy is a property of matter that gives us the ability to move or do work. The process of converting energy from one form to another is called energy transformation or energy conversion.

Energy is transformed in someplace every minute of every day. Thermal, electrical, nuclear, electromagnetic, mechanical, chemical, and sound energy are just a few of the many distinct sources of energy.

Energy transfer is the act of moving energy from one location to another.

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The freezing point is 18° C

Answer:

Strong Acid

Explanation:

Hope this helps! :)

According to the balanced reaction, one mole of N₂O₄ produce 3 moles of N₂. Thus  750 g of N₂O₄will produce 684.7 g of N₂. If the actual yield of N₂ is 650 g, the percent yield is 94.9 %.

The percent yield of a reaction is the ratio of actual yield to the theoretical yield multiplied by 100.

According to the given balanced reaction, one mole of N₂O₄ produce 3 moles of N₂. The molar mass of N₂O₄ is 92 g/mol and the molar mass of 3 moles of N₂ is 84 g. Thus 92 g of N₂O₄ produce 84 g of N₂.

The mass of N₂ produced from 750 g of N₂O₄ is then calculated as follows:

mass of N₂ = ( 750 × 84 /92)

                  = 684.7 g.

The actual yield of N₂ is given 650 g. Thus the percent yield of N₂ is calculated as:

Percent yield = (650 / 684.7) × 100

                      = 94.9 %.

Hence, the amount of N₂ produced from 750 g of N₂O₄ is 684.7 g and the percent yield is 94.9%.

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There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).

The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.

Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.

Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.

In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.

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Answer:

Yes cellular respiration is the only way to break down glucose.  Cellular respiration takes place by the cell using oxygen to break down glucose.  

The reaction order and rate law for this reaction is first, rate = k[A]. Option A is correct.

The reaction order and rate law for a reaction can be determined from the slope of a plot of ln[A] versus time.

Given that the plot of ln[A] versus time resulted in a straight line with a slope value of -2.97 x 10⁻² min⁻¹, we can determine the reaction order and rate law as follows;

If the slope is equal to 1, the reaction order is 1st order.

If the slope is equal to 2, the reaction order is 2nd order.

If the slope is equal to 3, the reaction order is 3rd order.

From the given slope of -2.97 x 10⁻² min⁻¹, we can conclude that the reaction order is 1st order, because the slope value is equal to -1 times the reaction order. So, the reaction order for this reaction is 1st order.

The rate law for a 1st order reaction will be given by;

rate = k[A]

where [A] is the concentration of the reactant, and k is the rate constant.

Therefore,  first, rate = k[A].

Hence, A. is the correct option.

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Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

A) Using the ideal gas law, we can calculate the number of moles of gas present:

```

PV = nRT

```

where:

* P = pressure (atm) = 1 atm

* V = volume (L) = 5.6 L

* n = number of moles of gas

* R = ideal gas constant = 0.08206 L atm / mol K

* T = temperature (K) = 273.15 K

Solving for n, we get:

```

n = (P * V) / RT

```

```

n = (1 atm * 5.6 L) / (0.08206 L atm / mol K * 273.15 K)

```

```

n = 0.25 mol

```

Therefore, there are 0.25 moles of gas present.

B) The molar mass of the gas can be calculated by dividing the mass of the gas (8.0 g) by the number of moles of gas (0.25 mol):

```

Molar mass = Mass / n

```

```

Molar mass = 8.0 g / 0.25 mol

```

```

Molar mass = 32 g/mol

```

The molar mass of the gas is 32 g/mol.

C) The common atmospheric gas with a molar mass of 32 g/mol is oxygen (O2). Therefore, the gas that was collected is oxygen.

Explanation:

Answer: mark as Brainliest

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Answer:

10 moles

Explanation:

moles=mass/molar mass, therefore 403.1/(24.31+16)=10

Answer:

Crust

Explanation:

Answer:

The crust

Explanation:

We are given:

half-life of carbon = 5715 years

Initial mass = 100 grams

Final mass = 12.5 grams

Finding the time taken:

Number of half-lives:

We know that in the relation:

\(\frac{Final\_mass}{Initial\_mass} = \frac{1}{2^{n}}\), n is the number of half-lives taken

replacing the given values:

12.5 / 100 = 1/2ⁿ

1/8 = 1/2ⁿ

2ⁿ = 8

2ⁿ = 2³

n = 3

Hence, it took 3 half-lives to reduce the mass to 12.5 grams

Number of years:

Time taken = 3 half-lives

we know that one half-life is 5715 years, replacing that value:

Time taken = 3*(5715) years

Time taken = 17145 years

Therefore, after 17145 years, a 100 gram sample of carbon will decay and only 12.5 grams will remain

Answer:

Is this math? Cause as a fourth grader, I can do Algebra, but not this.

Explanation: