a 2.00g sample of limestone was dissolved in hydrochloric acid and all the calcium present in the sample was converted to ca2 (aq). excess ammonium oxalate solution, (nh4)2c2o4(aq), was added to the solution to precipitate the calcium ions as calcium oxalate, cac2o4(s). the precipitate was filtered, dried and weighed to a constant mass of 2.43g. determine the percentage by mass of calcium in the limestone sample.

The correct formula that can be used to determine the partial pressure of nitrogen gas (\(N_2\)) in the mixture from the total pressure of the mixture and the partial pressures of the other two gases is: Partial Pressure of \(N_2\)= Total Pressure - Partial Pressure of \(H_2\)- Partial Pressure of He

In a mixture of gases, each gas contributes to the total pressure of the system independently. According to Dalton's Law of Partial Pressures, the total pressure exerted by a mixture of non-reacting gases is equal to the sum of the partial pressures of each individual gas.

In this case, the partial pressure of nitrogen gas (\(N_2\)) can be obtained by subtracting the partial pressures of the other two gases (\(H_2\)and He) from the total pressure of the mixture.

For example, if the total pressure of the mixture is given as P_total, and the partial pressures of hydrogen gas (\(H_2\)) and helium gas (He) are given as P_\(H_2\) and P_He, respectively, the formula can be applied as follows:

Partial Pressure of \(N_2\)= P_total - P_\(H_2\) - P_He

By using this formula, we can determine the partial pressure of nitrogen gas in the mixture based on the provided information about the total pressure and the partial pressures of the other gases.

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Answer:

4.52 x 10²⁴ atoms Cl

Explanation:

A mole is a name that means a certain number like a dozen means 12. 1 mole of chlorine atoms is 6.022 x 10²³ chlorine atoms. The unit conversion is 6.022 x 10²³/mol.

\(7.50molCl*\frac{6.022 x 10^{23} atomsCl}{1molCl} = 4.5165*10^{24} atomsCl\)

Round to 4.52 x 10²⁴ atoms Cl for the correct number significant figures.

The most likely mode of radioactive decay for the radioactive nuclide carbon-14 is beta decay.

During beta decay, a neutron in the carbon-14 nucleus is converted into a proton, releasing a high-energy electron called a beta particle. This transformation occurs because the neutron is unstable and wants to become more stable by converting into a proton.
The decay process can be represented by the equation:
^14_6C -> ^14_7N + ^0_-1e

In this equation, the carbon-14 nucleus (^14_6C) decays into a nitrogen-14 nucleus (^14_7N) by emitting a beta particle (^0_-1e).
Beta decay is a common mode of radioactive decay for isotopes with too many neutrons relative to protons. Carbon-14 is an example of such an isotope.
Carbon-14 is used in radiocarbon dating to determine the age of organic materials. By measuring the amount of carbon-14 remaining in a sample, scientists can estimate how long it has been since the organism died.

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The disease control (CDC) advertising campaign promoting influenza (flu) vaccination aims to increase the uptake of the seasonal influenza vaccination in risk groups.

CDC typically promotes influenza (flu) vaccination through various means such as television and radio advertisements, social media campaigns, brochures, and posters. These campaigns often stress on the importance of getting vaccinated to protect oneself and others from the flu, the effectiveness and safety of the flu vaccine, and the availability of the vaccine at various locations such as doctors' offices, clinics, and pharmacies.

Some campaigns also target specific groups such as children, pregnant women, and older adults who are at higher risk of complications from the flu.

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Answer:

1.2807 moles

Explanation:

From rearranging the equation for the ideal gas equation, you get the equation n=PV/RT, n= moles, P= pressure, V= volume, R= gas constant, T= temperature. Plugging in the numbers and converting kPa to atm and C to K, you get n=1.19418*28/ .0821*318.

Then, you just do the math and get 1.2807 moles.

Answer:

it could destroy the nucleus

Explanation:

due too much power going into it

Given data,

∣q∣=1.6×10−19 Cm

e=9.1×10−31 kgm

n≈m

p​=1.67×10−27

kgr≈5.28×10−11 m

Formula:

F e = 4πϵ 0 1 r2q e q n​​

F g  = G r 2m e m n

​​Given that,

∣q∣=1.6×10−19 C,

r≈5.28×10−11 m,

m e​=9.1×10−31 kg

 m n≈m p​=1.67×10−27 kg.

F e = 4πϵ 0 1 r2q e q

n​  =  9 × 10 9 N.

m2C−2 × 1 × (1.6 × 10−19 C)2 / (5.28 × 10−11 m)2

= 8.2 × 10−8 N

Similarly,

F g = G r 2m e m

n​  = 6.67 × 10−11 Nm2kg−2 × (1.67 × 10−27 kg) × (9.1 × 10−31 kg) / (5.28 × 10−11 m)2

= 8.2 × 10−8 N.

The radius of the hydrogen atom is the radius at which the attractive electric force between the proton and the electron equals the gravitational force, or,

FE = FG8.2 × 10−8 N = 8.2 × 10−8 N 5.28 × 10−11 m

= (4πε₀) (1.6 × 10−19 C)2 / r2 G (1.67 × 10−27 kg) (9.1 × 10−31 kg)

Simplifying,

r3 = (4πε₀ / G) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)

The universal gravitational constant is,

G = 6.67 × 10−11 m3 ⋅ kg−1 ⋅ s−2r3

= (4π × 8.8542 × 10−12 F/m) / (6.67 × 10−11 N m2/kg2) (1.6 × 10−19 C)2 (1.67 × 10−27 kg) (9.1 × 10−31 kg)r

= 5.3 × 10−11 m, approximately.

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The very high gas pressure used in many industrial gas-phase operations is produced by compressing gases that were at ambient pressure into a substantially smaller volume.

Thus, Changing a gas's volume will alter its concentration, which will alter the rate at which it combines with other substances if all other factors remain constant.

The forward pace of reaction doubles as N2O4 concentration increases. Contrarily, the reverse reaction requires two moles of NO2, hence doubling the quantity of NO2 causes the rate of the reaction to increase by four times.

First and foremost, it's crucial to note that altering a gas-phase reaction system's volume affects both the forward and reverse reaction speeds. The impact on these two rates might not be the same, which is the second crucial aspect.

Thus, The very high gas pressure used in many industrial gas-phase operations is produced by compressing gases that were at ambient pressure into a substantially smaller volume.

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Answer:

As water is boiled, kinetic energy causes the hydrogen bonds to break completely and allows water molecules to escape into the air as gas (steam or water vapor). When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding.

Explanation:

Answer:

D is the correct option.

Explanation:

A seismograph detects seismic waves which travel through the Earth, that is mainly rock(taking from the options given)

Answer:

It is just rock!

Explanation:

Answer:

C₂H6

Explanation:

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). Option A

A hydrocarbon is a compound that consists of only carbon and hydrogen atoms. It is important to identify the formula that represents a hydrocarbon among the given options:

A) C₂H6: This formula represents ethane, which is a hydrocarbon. Ethane consists of two carbon atoms bonded together with single bonds and six hydrogen atoms.

B) C₂H5OH: This formula represents ethanol, which is not a hydrocarbon. Ethanol contains a hydroxyl group (-OH), indicating the presence of oxygen in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

C) C₂H5Cl: This formula represents ethyl chloride, which is not a hydrocarbon. Ethyl chloride contains a chlorine atom (Cl) in addition to carbon and hydrogen atoms. It is a haloalkane, not a hydrocarbon.

D) C₂H6O: This formula represents ethanol, which, as mentioned before, is not a hydrocarbon. Ethanol contains an oxygen atom (O) in addition to carbon and hydrogen atoms. It is an alcohol, not a hydrocarbon.

Among the given options, the formula A) C₂H6 represents a hydrocarbon (specifically, ethane). It consists only of carbon and hydrogen atoms, making it a suitable representation of a hydrocarbon.

In summary, the formula C₂H6 (option A) represents a hydrocarbon, while the other options contain additional elements (oxygen or chlorine) that make them non-hydrocarbon compounds. Option A

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Answer:

Lines of longitude

Explanation:

Lines of direction and lines of longitude are horizontally and vertically lines, respectively.

The phrases vertical and horizontal are frequently used to define directions: a vertical line runs up and down, whereas a horizontal line crosses.

Silver (Atomic Mass) :- 107.8682 u

Answer:

Atomic Number: 47

Atomic Mass: 107.8682 u

The partition coefficient of the benzene-water extraction mixture for caffeine is approximately 2.5. The partition coefficient, often denoted as P, is a measure of the distribution of a solute between two immiscible phases, such as benzene and water in this case.

It is calculated by dividing the concentration of the solute in one phase by its concentration in the other phase.

Given that 100 g of benzene dissolves 5.5 g of caffeine and 100 g of water dissolves 2.2 g of caffeine, we can calculate the partition coefficient as follows:

P = (Concentration of caffeine in benzene) / (Concentration of caffeine in water)

To calculate the concentrations, we divide the mass of caffeine by the mass of the solvent:

Concentration of caffeine in benzene = 5.5 g / 100 g = 0.055 g/g

Concentration of caffeine in water = 2.2 g / 100 g = 0.022 g/g

Now we can calculate the partition coefficient:

P = (0.055 g/g) / (0.022 g/g) ≈ 2.5

Therefore, the partition coefficient of the benzene-water extraction mixture for caffeine is approximately 2.5.

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To combat the most common adverse effects of chemotherapy, a nurse should administer an : Antiemetics.

Antiemetics will most likely be given to chemotherapy patients to treat nausea and vomiting, and up to three antiemetics may be used. The most common serotonin receptor blockers are:

Some patients experience nausea and vomiting prior to the infusion. An anti-anxiety medication such as Ativan may be beneficial. A suppository can be used in patients who are already vomiting. Nausea and vomiting can occur before, during, or after chemo treatment. Therefore, to combat the most common adverse effects of chemotherapy, a nurse should administer an antiemetics.

Alternatives to Drugs :

Along with antiemetics, acupressure wristbands, which are available at most pharmacies, may provide some relief.

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Answer:

Environmental factors such as diet, temperature, oxygen levels, humidity, light cycles, and the presence of mutagens can all impact which of an animal's genes are expressed, which ultimately affects the animal's phenotype.

Explanation:

Answer:

atoms have same atomic number but different atomic masses is called isotopes

Explanation:

The decomposition of calcium carbonate is an endothermic reaction.

The given equation for the decomposition of calcium carbonate is:

CaCO₃ → CaO + CO₂

ΔH = +110 kJ/mol

where ΔH is the enthalpy change for the reaction.

The positive value of ΔH in the equation indicates that the reaction is endothermic, meaning that heat is absorbed by the reactants from the surroundings during the reaction. This means that the reaction requires an input of energy to proceed, and the products (CaO and CO₂) have higher potential energy than the reactant (CaCO₃).

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--The complete question is, Calcium carbonate decomposes in this balanced equation:

CaCO3 + CaO + CO2 ΔH = +110 kJ/mol

Is this reaction endothermic or exothermic?--

Carbon is a chemical element with a chemical symbol "C". It has an atomic number of 6. That means a carbon atom has 6 protons, 6 neutrons, and 6 electrons. Since carbon is in the second row (or second period), it has 2 electron orbits. Use the clay to make your protons and neutrons in the nucleus.

However, some factors do influence its durability, like its matrix. Furthermore, the intense use of composites and environmental factors could affect its durability and potential applications.

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This problem is providing us with the moles of both sugar and ammonia and asks for a comparison between the moles and their amounts in grams. At the end, one concludes they have different amounts as 1,743.42 g and 119.21 g.

In chemistry, mole-mass relationships are used to calculate grams from moles or vice versa, according to specific conditions. In such a way, for sugar and ammonia, one can first calculate their molar masses with:

\(MM_{C_6H_{12}O_{11}}=6*12.01+12*1.01+11*16.00=249.06g/mol\\ \\MM_{NH_3}=14.01+1.01*3=17.03g/mol\)

Next, we calculate grams with the following proportional factors:

\(7molC_6H_{12}O_{11}*\frac{249.06gC_6H_{12}O_{11}}{1molC_6H_{12}O_{11}} =1743.42g\\\\7molNH_3*\frac{17.03gNH_3}{1molNH_3}=119.21gNH_3\)

Thus, we conclude that despite having equal number of moles, they differ in the amount of grams because of their dissimilar molar masses.

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The major difference between altair and the sun is their difference in mass. They differ in classifications due to variations in age with Altairs being younger compared to The Suns' maturity as well as holding an A-type categorization accredited by elevated mass quantities surpassing those of The Suns'.

While there exist detectable disparities between Altair and the Sun's physical properties respective to each other; there exists a remarkable similarity between them concerning their fundamental building blocks- chemical elements like hydrogen, helium, oxygen, carbon and nitrogen that were developed through an occurrence called nuclear fission inside star cores.

Nuclear fusion is the process by which two or more atomic nuclei come together to form extensive nucleus resulting in massive amounts of energy generation required to power the stars.

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The two reasons Democritus’ ideas about the atom were NOT accepted are atoms are indestructible and they move in infinite space.

An atom is the smallest unit of ordinary matter that forms a chemical element.

Democritus believed that atoms were uniform, solid, hard, incompressible, and indestructible and that they moved in infinite numbers through empty space until stopped.

Differences in atomic shape and size determined the various properties of matter.

Thus, the two reasons Democritus’ ideas about the atom were NOT accepted are atoms are indestructible and they move in infinite space.

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The quantities represented by each of the measurements are

5.0g/mL - Density

37s - Time

47J - Energy or Work

39.56g - Mass

25.3 cm3 - Volume

325 m/s - Time

500m2 - Area

30.23 mL - Volume

2.7 mg - Mass

0.005L - Volume

To determine the quantity each of the measurements represents, we will observe the units.

This represents density. Density is the ratio of mass to volume, and mass is measured in grams (g) while volume is measured in milliliters (mL)

This represents time because time is measured in seconds (s)

This represents Energy or Work because they are measured in Joules (J)

This represents mass because mass in measured in grams (g)

This represents volume because volume is measured in cubic meters (cm³)

This represents time. Time can be measured in milliseconds (ms)

This represents area because area is measured in square meters (m²)

This represents volume because volume is measured in milliliters (mL)

This represents mass because mass could be measured in milligrams (mg)

This represents volume because volume is measured in liters (L)

Hence, the quantities represented by each of the measurements are

5.0g/mL - Density

37s - Time

47J - Energy or Work

39.56g - Mass

25.3 cm3 - Volume

325 m s - Time

500m2 - Area

30.23 mL - Volume

2.7 mg - Mass

0.005L - Volume

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Answer:

the answer is salmonella

The word equation would be:

Copper solid plus oxygen gas giving solid cupric oxide

Answer:

CuO(s)

Explanation:

This is the product.

Answer:

1.  Atom

2. formula unit

Explanation:

i'm not really sure but i think that's right

The weight percentages of sodium chloride is 23.1 % and water is 76.9 % in the solution. The theoretical density of the initial concentrated solution is 0.30 g/mL.

The mass of the sodium chloride = 30 g

The mass of the water = 100 mL = 100 g

The total mass = 30 + 100

                         = 130 g

The mass percentage of sodium chloride = (30 / 130 ) × 100 %

                                                                        = 23.1 %

The weight percentage of the water = ( 100 / 130 ) × 100 %

                                                             = 76.9 %

The density of the solution = mass / volume

                                             = 30 / 100

                                            = 0.30 g/mL

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Answer: The density of the rock is 3.03

Explanation:

Density formula:

P = mass/volume

= 170/56

= 3.03

Note: cannot measure density, so there is no sign beside it.

The required force is 280 N.

We must subtract our individual forces in order to calculate the net force.

In general, whenever forces act on an object in opposite directions-the net force is equal to the difference between the two forces.

To calculate the net force, one force is subtracted from the other. therefore, here

325 N is force 1 to the right.

45 N is force 2 to the left.

Force 1 - Force 2 is the net force.

net force= 325N - 45N

net force= 280 N

So the required force is 280 N.

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The net force of the runner would be 280 N.

Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!

Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"

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