When our calculator math provides the value 0.0021471, but we need to record the value with only three significant figures, what would we record?

The length of the real-life crystal is 120 cm which is 24 times longer than the length of the crystal in the model.

Given that, a student makes a model of a mineral crystal.

The scale is 1:24. The crystal in the model is 5 cm long.

We are given a scale of 1:24, which means that every unit in the model represents 24 units in real life.

To find the length of the real-life crystal, we need to use the scale factor of 24.

We can set up a proportion to solve for the real-life length of the crystal:

1 unit in the model : 24 units in real life

5 cm in the model : x cm in real life

Using cross-multiplication, we get:

1 × x = 24 × 5

x = 24 × 5

x = 120cm

Therefore, the real-life crystal measures 120cm.

Option A) 120cm is the correct answer.

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The correct rate law that is consistent with the elementary steps in the mechanism is rate = k[NO2][CO].

The rate law is a mathematical expression that describes how the reaction rate changes with respect to the concentrations of the reactants. In this proposed mechanism, the reaction occurs through two steps: NO2(g) → NO3(g) + NO(g) and NO3(g) + CO(g) → NO2(g) + CO2(g).

The rate of the reaction is determined by the rate of the slowest step, which is the first step. Thus, the rate law is consistent with the elementary steps in the mechanism if it includes the concentrations of NO2 and CO as reactants, as they are the only species involved in the rate-determining step. Therefore, the correct rate law is rate = k[NO2][CO].

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The question is -

Step 1:2NO2(g)→NO3(g)+NO(g)(slow)

Step 2:NO3(g)+CO(g)→NO2(g)+CO2(g)(fast)

A proposed two-step mechanism for the chemical reaction NO2(g)+CO(g)→NO(g)+CO2(g) is shown above. Which of the following equations is a correct rate law that is consistent with the elementary steps in the mechanism?

As we can see, molecules of substance A are more distant from each other, while that of substance b are closer and substance c are very close.

We can therefore assume that substance A is in the gaseous state, substance b is in the liquid state and substance c is in the solid state.

In the solid state, the shape and volume are well defined. In the liquid state, shape and volume are more or less defined, whereas in the gaseous state, shape and volume are not defined.

Substances in the gasous and liquid state will react to the increased volume of space.

Answer: Alternative "A"

Answer:

CaH2O2

Explanation:

ez

Explanation:

Gregor Mendel knew how to keep things simple. In Mendel's work on pea plants, each gene came in just two different versions, or alleles, and these alleles had a nice, clear-cut dominance relationship (with the dominant allele fully overriding the recessive allele to determine the plant's appearance

Explanation:

42.3 g of N2O5 were reacted with 9.18 g of H2O according to the following equation.

N₂O₅ + H₂O ----> 2 HNO₃

To determine which is the limiting reagent we will calculate the number of moles of HNO₃ that would be produced by each reactant. The one that produces less product is the one that is limiting the reagent.

N₂O₅:

First we can convert the 42.3 g of it into moles using its molar mass.

molar mass of N₂O₅ = 108.01 g/mol

moles of N₂O₅ = 42.3 g * 1 mol/(108.01 g)

moles of N₂O₅ = 0.392 moles

N₂O₅ + H₂O ----> 2 HNO₃

According to the reaction 1 mol of N₂O₅ will produce 2 moles of HNO₃. Then the molar ratio between them is 1 to 2. We can use this relationship to find the number of moles of HNO₃ that would be produced by 0.392 moles of N₂O₅.

1 mol of N₂O₅ : 2 moles of HNO₃ molar ratio

moles of HNO₃ = 0.392 moles of N₂O₅ * 2 moles of HNO₃/(1 mol of N₂O₅)

moles of HNO₃ = 0.784 moles

H₂O:

molar mass of H₂O = 18.02 g/mol

moles of H₂O = 9.18 g * 1 mol/(18.02 g)

moles of H₂O = 0.509 moles

1 mol of H₂O : 2 moles of HNO₃ molar ratio

moles of HNO₃ = 0.509 moles of H₂O * 2 moles of HNO₃/(1 mol of H₂O)

moles of HNO₃ = 1.018 moles

Conclusion:

When 42.3 g of N₂O₅ reacts with enough H₂O, 0.784 moles of HNO₃ are produced. When 9.18 g of H₂O reacts with enough N₂O₅, 1.018 moles of HNO₃ are produced. N₂O₅ is limiting our reaction and is the limiting reagent.

Answer: N₂O₅ is the limiting reagent.

7 years is the approximate age of the wooden artifact.

To determine the approximate age of the wooden artifact, we can use the concept of carbon dating. Carbon dating relies on the decay of carbon-14 (C-14) in organic materials to estimate their age.

The half-life of carbon-14 is approximately 5770 years. This means that after each half-life period, the amount of C-14 in a sample decreases by half. By measuring the remaining amount of C-14 in the sample, we can estimate its age.

Given that the wooden artifact contains 7 grams of carbon and the rate of decay is 1 disintegration per minute per gram (dpm/g), we can calculate the age as follows:

Convert the decay rate to the rate of disintegrations per minute for the entire sample:

Decay rate for the entire sample = decay rate per gram × sample mass

Decay rate for the entire sample = 1 dpm/g × 7 g = 7 dpm

Calculate the number of half-lives that have occurred:

Number of half-lives = (decay rate for the entire sample) / (decay rate per half-life)

Number of half-lives = 7 dpm / (1 dpm/g × 5770 years) = 7 / 5770

Calculate the age of the artifact:

Age = (number of half-lives) × (half-life of carbon-14)

Age = (7 / 5770) × 5770 years = 7 years

Therefore, the approximate age of the wooden artifact, based on the given information, is approximately 7 years.

It's important to note that this simplified calculation assumes a constant decay rate over time and neglects other factors that may affect the accuracy of carbon dating, such as contamination and variations in C-14 production rates. Carbon dating is most reliable for materials up to around 50,000 years old.

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Answer:

ako po kailangan ko po nga ayuda

Explanation:

thanks for the points ❤️

Answer:

\(m_{solute}=0.78gCH_2 (CO_2 H)_2\)

Explanation:

Hello.

In this case, for the given volume and molarity of malonic acid (solute), we can compute the mass by first computing the moles considering the definition of molarity:

\(M=\frac{n_{solute}}{V_{solution}} \\\\n_{solute}=M*V_{solution}=0.15mol/L*50.00mL*\frac{1L}{1000mL}\\ \\n_{solute}=0.0075molCH_2 (CO_2 H)_2\)

Then, since the molar mass of the malonic acid is 104.1 g/mol, we can compute the required mass in g of malonic acid for the preparation of that solution as shown below:

\(m_{solute}=0.0075molCH_2 (CO_2 H)_2*\frac{104.1gCH_2 (CO_2 H)_2}{1molCH_2 (CO_2 H)_2}\\ \\m_{solute}=0.78gCH_2 (CO_2 H)_2\)

Notice that the shortest number is the molarity (0.15 M) with two significant figures, that is why the answer is displayed with two significant figures too.

Regards.

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

I believe the best answer is B. Copper.

The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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The mass of 4.640 x \(10^{2}\) L particles of Aluminium is 33.67 g

The total number of molecules present in 22.4 litres of an element is equal to Avagadro's Number.

The value of Avagadro's number = \(6.023*10^{23}\).

To calculate the mass of \(4.640*10^{2}\) litres of Al, we first need to find the number of molecules present in it, then find the product of the number of molecules present will the mass of one molecule of Al atom.

Mass of Al=27

Number of molecules in 22.4 litres of Al = \(6.023*10^{23}\)

Number of molecules in 1 litre of Al =  \(\frac{6.023*10^{23}}{22.4}\)

Number of molecules in \(4.640*10^{2}\) litres of Al=  \(\frac{{6.023*10^{23}*4.640*10^{2}}}{22.4}\)

=\(1.247*10^{21}\)

Mass of \(1.247*10^{21}\) molecules of Al:

= \(1.247*10^{21}*27\) g

=33.669 g

=33.67 g

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A 13.0kg iron weightlifting plate has a volume of 1650cm³. Therefore, 7.87g/cm³ is the density of iron plate.

The density of a substance is described as its weight per unit volume. In other words, density is the mass-to-volume ratio or weight per unit volume. It quantifies how much "stuff" a thing possesses inside an unit of volume (cubic meter or cubic centimeter).

Density is a measure of how closely stuff is packed together. Archimedes, a Greek scientist, developed the density principle.

density= mass / volume

            = 13000/  1650

            =7.87g/cm³

Therefore, 7.87g/cm³ is the density of  iron plate.

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Approximately 0.157 liters or 157 milliliters of the 4.50 M HCl solution can be made by mixing the given solutions.

To determine the volume of 4.50 M HCl that can be made by mixing the given solutions, we can use the concept of the concentration-volume relationship:

C1V1 = C2V2

Where:

C1 = concentration of the first solution

V1 = volume of the first solution

C2 = concentration of the second solution

V2 = volume of the second solution

Let's assign the variables as follows:

C1 = 5.65 M

V1 = unknown volume (we'll solve for this)

C2 = 3.55 M

V2 = 250.0 mL = 0.250 L (since the volume is given in milliliters)

Now we can plug in the values into the equation and solve for V1:

(5.65 M)(V1) = (3.55 M)(0.250 L)

Dividing both sides of the equation by 5.65 M:

V1 = (3.55 M)(0.250 L) / 5.65 M

V1 ≈ 0.157 L

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Electron configuration refers to the distribution of electrons in atoms and molecules.

In conclusion, electron configuration refers to the distribution of electrons in atoms and molecules.

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Answer:

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals.

Answer:

Explanation:

Here, we want to get the mass of the anhydrous compound in the given hydrate

To get this, we have to divide the molar mass of the hydrate part by the molar mass of the whole hydrate and write it as a percentage

The molar mass of the water part is (5 * 18 g/mol = 90 g/mol: The molar mass of 1 mol of water is 18 g/mol)

The molar mass of CuSO4 is 160 g/mol

The percentage by mass is thus:

Answer:

NH4NO3 = N2O + 2(H2O)

Explanation:

there are 2 N, 4 H, 3 O

Answer:

NH4NO3=N2O+2H2O

Explanation:

N-2,O-3,H-4

Initial solution concentration of the original sulfuric acid solution is 1.66.

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Answer:

The answer is (e) none of the above. The combined gas law relates the pressure, volume, and temperature of a gas, so all three variables (pressure, volume, and temperature) must be considered and at least one of them should be held constant to use the combined gas law. The mass of the gas sample, number of moles of gas, and number of gas molecules are not directly related to the combined gas law.

The amount of energy required to heat 100 g of water is 268000 J.

Energy is the ability or the capacity to perform work.

To calculate the amount heat energy required to change the water to steam, we use the formula below.

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1

Hence, the amount of energy required is 268000 J.

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Answer:

About 5.64 mol/L.

Explanation:

Recall that the concentration of a soluion, or its molarity, is given by:

\(\displaystyle \text{M} = \frac{\text{ mols solute}}{\text{ L soln.}}\)

In this case, our solute is 82.2 g of NaCl and our solution is in a 250. mL volumetric flask.

Convert 82.2 g of NaCl to moles of NaCl. The molecular weight of NaCl is:

\(\displaystyle \begin{aligned} \mathcal{M}_{\text{NaCl}} & = (22.99 + 35.45) \text{ g/mol} \\ \\ & = 58.44 \text{ g/mol}\end{aligned}\)

Hence:

\(\displaystyle 82.2\text{ g NaCl} \cdot \frac{ 1 \text{ mol NaCl}}{58.44 \text{ g NaCl}} = 1.41 \text{ mol NaCl}\)

Convert the volume to liters:

\(\displaystyle 250. \text{ mL} \cdot \frac{1 \text{ L}}{1000 \text{ mL}} = 0.250 \text{ L}\)

Hence, the concentration of the solution is:

\(\displaystyle \begin{aligned} \text{M} & = \frac{(1.41 \text{ mol NaCl})}{(0.250 \text{ L soln.})} \\ \\ & =5.64 \text{ mol/L} \end{aligned}\)

In conclusion, the concentration of the solution in mol/L is about 5.64 mol/L.

2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams. Density is the mass of a specific material per unit volume.

Density is the mass of a specific material per unit volume. Density is defined as d = M/V, in which d represents density, M is weight, as well as V is volume. Density is generally expressed in grams every cubic centimetre. Water, for example, has a density of 1 gram per square centimeter, but Earth has a density of 5.51 kilograms per cubic centimetre.

Density is sometimes measured in kilos per cubic centimeter (in metre-kilogram-second or SI units). The density of air, for example, is 1.2 kilos per cubic metre. 

density = mass / volume

            =53/ 20

            =2.65g/ml

Therefore, 2.65g/ml is the density of a piece of granite whose volume is 20 mL and mass is 53grams.

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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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The general form of a neutralization reaction is HF + FrOH → FrF + H₂O

We refer to this as a neutralisation reaction. Only this reaction, which produces NaCl and water as products, is a neutralisation reaction since it involves HCl and NaOH. The resulting response is listed below: NaCl(aq) + H₂O = HCl(aq) + NaOH(aq) (l)

The interaction of H⁺ ions and OH⁻ ions produces water in a neutralisation reaction, which occurs when an acid and a base combine to make water and a salt. The neutralisation of a strong acid and strong base yields a pH of 7.

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Answer:

Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water.

Explanation:

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Answer: Water and NaCl is always formed

Explanation:

I hope this helped!

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In an exothermic reaction, the reactants have more energy than the products.

The balanced chemical equation is CaS + AlC → A + CaC

To balance the chemical equation CaS + AlC → A + CaC, we need to ensure that the same number of atoms of each element is present on both sides of the equation. Here's the step-by-step process to balance the equation:

Begin by counting the number of atoms of each element on both sides of the equation.

Left side (reactants):

Calcium (Ca): 1

Sulfur (S): 1

Aluminum (Al): 1

Carbon (C): 1

Right side (products):

A: 1

Calcium (Ca): 1

Carbon (C): 1

Sulfur (S): 0

Start by balancing the elements that appear in the fewest compounds. In this case, we can balance sulfur (S) first. Since there is only one sulfur atom on the left side and none on the right side, we need to add a coefficient of 1 in front of A on the right side to balance the sulfur.

CaS + AlC → 1A + CaC

Next, balance calcium (Ca) by adding a coefficient of 1 in front of CaS on the left side.

1CaS + AlC → 1A + CaC

Now, balance aluminum (Al) by adding a coefficient of 1 in front of AlC on the left side.

1CaS + 1AlC → 1A + CaC

Finally, balance carbon (C) by adding a coefficient of 1 in front of CaC on the right side.

1CaS + 1AlC → 1A + 1CaC

The balanced chemical equation is:

CaS + AlC → A + CaC

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