A chemist measured the amount of calcium sulfide produced during an experiment. She finds that of calcium sulfide is produced. Calculate the number of moles of calcium sulfide produced.

Answer:

177.3 meters per second

Explanation:

Assuming that both gases are at the same temperature, we can use Graham's law to calculate the ratio of the average speeds of N2 and He molecules:

(ratio of speeds) = sqrt(molar mass of He/molar mass of N2)

The molar mass of N2 is 28.02 g/mol, and the molar mass of He is 4.00 g/mol. Therefore:

(ratio of speeds) = sqrt(4.00/28.02) = 0.379

We know that the average speed of N2 molecules is 468 m/s. Therefore:

(average speed of He molecules) = (ratio of speeds) x (average speed of N2 molecules) = 0.379 x 468 m/s = 177.3 m/s

Therefore, the average speed of He molecules at the same temperature is approximately 177.3 meters per second.

Answer:

Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.

Explanation:

The Calvin cycle is a metabolic pathway that uses the chemical energy of the production of ATP and NADPH from the light-dependent reactions of photosynthesis. The cycle uses CO2 and Glyceraldehyde-3-phosphate molecules to make one of glucose.

The Calvin cycle is an anabolic-type metabolic pathway in which, starting from atmospheric CO2 molecules, glucose synthesis is achieved.

Therefore, we can conclude that the Calvin cycle is a metabolic pathway in which atmospheric CO2 is captured by the plant and, going through different chemical changes, forms glucose.

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Answer:

See explanation

Explanation:

According to chemistry libretexts(2020); "The rms velocity is directly proportional to the square root of temperature and inversely proportional to the square root of molar mass. Thus quadrupling the temperature of a given gas doubles the rms velocity of the molecules. ... As the temperature of a gas is increased, the velocity of the molecules is also increased."

Hence considering two gases for which the  Vrms of the particles of one is high and that of the other is low, we can conclude that the gas having the higher  Vrms is at a higher temperature than the gas having a lower  Vrms according to the foregoing.

Hi! Formula:- Physics of Nondestructive Evaluation > Materials and Processes > Atomic Bonding

Atomic Bonding

In the Bohr model, the nucleus is composed of protons and neutrons. Atomic number identifies the number of protons in the nucleus. Atomic mass is the sum of protons and neutrons. Electrons orbit the nucleus. Protons and electrons have equal but opposite electrical charge.From elementary chemistry it is known that the atomic structure of any element is made up of a positively charged nucleus surrounded by electrons revolving around it. An element’s atomic number indicates the number of positively charged protons in the nucleus. The atomic weight of an atom indicates how many protons and neutrons in the nucleus. To determine the number of neutrons in an atom, the atomic number is simply subtracted from the atomic weight.

Atoms like to have a balanced electrical charge. Therefore, they usually have negatively charged electrons surrounding the nucleus in numbers equal to the number of protons. It is also known that electrons are present with different energies and it is convenient to consider these electrons surrounding the nucleus in energy “shells.” For example, magnesium, with an atomic number of 12, has two electrons in the inner shell, eight in the second shell and two in the outer shell.

All chemical bonds involve electrons. Atoms will stay close together if they have a shared interest in one or more electrons. Atoms are at their most stable when they have no partially-filled electron shells. If an atom has only a few electrons in a shell, it will tend to lose them to empty the shell. These elements

are metals. When metal atoms bond, a metallic bond occurs. When an atom has a nearly full electron shell, it will try to find electrons from another atom so that it can fill its outer shell. These elements

are usually described as nonmetals. The bond between two nonmetal atoms is usually a covalent bond. Where metal and nonmetal atom come together an ionic bond occurs. There are also other, less common, types of bond but the details are beyond the scope of this material.

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The mass of the zinc that is required is 184.6 g.

We know that the term reaction has to do with the combination of two substances. Often times, we would have a new substances that is formed which is the product of the reaction.

Let us look at the reaction between zinc and copper II sulfate and that reaction is written as; \(Zn(s) + CuSO_{4} (aq) ------ > ZnSO_{4} (aq) + Cu(s)\)

Number of moles of the copper sulfate = 454 g/159.61 g/mol

= 2.84 moles

Now, the reaction is 1:1  we can see;

Number of moles = mass/molar mass

Mass of Zn = 2.84 moles * 65 g/mol

= 184.6 g

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Answer:

a chemical change

Explanation:

lighting a match is a chemical change. chemical reactions cause chemical change. in a chemical reaction two or more substances, called the reactants, form different substances called products. hope this helped :)

From the calculation, there are 1.5 g of water produced in the reaction.

An equation shows the chemical transformation that takes place in a reaction vessel. In this case, the equation is; C6H12O6 + 6 O2 --> 6 CO2 + 6 H2O.

Now;

Number of moles of glucose = 2.5g/180 g/mol = 0.014 moles

Since 1 mole of glucose produces 6 moles of water

0.014 moles of glucose produces 0.014 moles * 6 moles/ 1 mole

= 0.084 moles

Mass of water produced = 0.084 moles * 18 g/mol = 1.5 g of water

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When we have to name an organic compound, one thing that we need to take into consideration is the type of bond that it is in the carbon chain. One way to determine what type of bond we have, is by counting the number of Carbons and Hydrogens present in the chain.

We know that we have 6 carbons

If we have 14 Hydrogens (6*2+2), we have an Alkane

If we have 12 Hydrogens (6*2), we have an Alkene

If we have 10 Hydrogens (6*2-2), we have an Alkyne

Since we have 6 carbons and 14 hydrogens, therefore we have an Alkane, option B

Peanut doesn't dissolve in acetone because the crosslinking structure of polystyrene can be broken down in some organic solvents such as acetone.

What is acetone?

Acetone, is described as an organic compound with the formula (CH₃)₂CO which is the simplest and smallest ketone.

Acetone is known to be colorless, highly volatile and flammable liquid with a characteristic pungent odor.

When the polystyrene peanuts are added to the acetone, they do not really dissolve in the acetone, but instead go through a process called “swelling” that allows the trapped gases to escape.

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The nucleus of an atom is positively charged and contains most of the mass if the atom.

An atom is the smallest particle of a an element that can take part in a chemical reaction.

Atoms are made up of other smaller sub-particles which are:

The protons and neutrons are found in the nucleus of an atom

The electrons are found regions around the nucleus.

Due to the positive charge of the protons, the nucleus of an atom are positively charged and is massive.

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The bond length has been defined by the distance shared by the covalently bonded atoms. C≡N (887 kJ/mol) has the longest bond followed by C=N and the shortest C-N.

Bond length is a parameter that defines the bond distance and measures the length between the bonded atoms. It is determined by bonded electrons.

The bond energy and bond length are directly related and hence the C≡N (887 kJ/mol) has the longest bond length because of high energy followed by C=N (615 kJ/mol) and the shortest C-N (305 kJ/mol).

Therefore, the order of bond length is C≡N > C=N > C-N.

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Calculate the normality of 1 Kg of aluminum sulfide in 5000 ml of solution.

Normality comes out to be 8.11

n-factor for \(Al_{2}S_{3}\) is 6 and molar mass is 148g

So, on calculating equivalent mass is equal to 24.66g

FORMULAE of Normality (N) = (Mass of the solute) / (Equivalent mass of the solute (E) × Volume of the solution (V)

                                           N=\(\frac{1000}{24.66*5}\)

                                          N=8.11

Therefore, normality of 1 kg aluminum sulfide is 8.11

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Yes, because it describes action-reaction force pairs

The law of conservation of mass states that in a chemical reaction, the total mass of the reactants is equal to the total mass of the products. To provide evidence for this law, we can perform an experiment in which calcium carbonate (\(CaCO_3\)) is decomposed to produce calcium oxide (CaO) and carbon dioxide (\(CO_2\) ), and then measure the masses of the reactants and products.

Method:

Weigh a sample of \(CaCO_3\) using a balance.

Heat the \(CaCO_3\) in a crucible until it decomposes to CaO and \(CO_2\). The \(CO_2\) gas will escape, leaving only CaO in the crucible.

Allow the crucible to cool and then weigh it again to determine the mass of the CaO produced.

Collect the \(CO_2\) gas that is released during the reaction in a gas syringe or other collection device. Measure the volume of \(CO_2\) gas produced, and calculate its mass using its molecular weight.

Which measurements should be taken:

The following measurements should be taken:

The mass of the \(CaCO_3\) used as a reactant.

The mass of the CaO produced as a product.

The volume of \(CO_2\) gas produced during the reaction.

The temperature and pressure of the \(CO_2\) gas to allow for the calculation of its mass.

How the student could show evidence for the conservation of mass:

To show evidence for the law of conservation of mass, the student can compare the mass of the \(CaCO_3\) used as a reactant to the total mass of the products, which includes the mass of CaO produced and the mass of \(CO_2\) gas released.

The sum of the masses of CaO and \(CO_2\) should be equal to the mass of the \(CaCO_3\) used as a reactant, within experimental error. This will provide evidence that the mass of the reactants is conserved and equals the mass of the products, as required by the law of conservation of mass.

Additionally, the student could calculate the theoretical yield of CaO and CO2 based on the balanced equation for the reaction, and compare this to the actual yield obtained from the experiment. Any difference between the theoretical and actual yields could be due to experimental error, but the comparison can still provide additional evidence for the conservation of mass.

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Answer:

28645 years

Explanation:

Given the formula;

0.693/t1/2 = 2.303/t log (No/N)

Given that N = 1/32 No

Note;

t1/2 = half life of Carbon-14

t = time required for N amount of carbon -14 to remain= 5,730 years

No= amount of carbon 14 initially present

N = amount of carbon-14 after time t

Substituting values;

0.693/5,730 = 2.303/t log (No/1/32No)

0.693/5,730 = 2.303/t log 32

1.21 * 10^-4      = 3.466/t

t = 3.466/1.21 * 10^-4

t = 28645 years

Any preserved imprints, remains and traces of once a living organism from history are called fossils. By utilizing the radioactive property of organic compounds one can determine the age of an object.

The approximate age of the fossilizes remain is 28645 years.

This can be estimated as:

The formula used will be:

\(\dfrac{0.693}{\dfrac{t1}{2}}= \dfrac{2.303}{t} log (\dfrac{No}{N})\)

Where,

Given,

N = \({\dfrac{1}{32} No\)

Replacing values in formula:

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} log \:({{\dfrac{No}{\dfrac{1}{32} No}})\)

\(\dfrac{0.693}{5,730} & = \dfrac{2.30}{t} \;log 32\)

\(1.21 \times 10^{-4} = \dfrac{3.466}{t}\)

\(t = \dfrac{3.466}{1.21} \times 10^{-4}\)

\(t = 28645 \:\text{years}\)

Therefore, the approximate age of the fossil is 28645 years.

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The molarity of the chloride ions in the final solution is 0.747 M.

Given:

1.60 g of solid NaCl to 50.0 mL of 0.100 M calcium chloride solution.

To find:

The molarity of chloride ions in the final solution.

Solution:

Molarity of the calcium chloride solution = 0.100 M

Volume of the  calcium chloride  solution = V = 50.0 mL

\(1mL=0.001 L\\\\V=50.0mL=50.0 \times 0.001 L\\\\= 0.050 L\)

Moles of calcium chloride = n

\(0.100 M=\frac{n}{0.050 L}\\\\n=0.100 M\times 0.050 L=0.005 mol\)

\(CaCl_2(aq)\rightarrow Ca^+(aq)+2Cl^-(aq)\)

Moles of chloride ions in solution = \(2\times 0.005 mol=0.010 mol\)

Mass of sodium chloride = 1.60 g

Moles of sodium chloride :

= \(\frac{1.60 g}{58.5 g/mol}=0.02735 mol\)

\(NaCl(s)\rightarrow Na^+(aq)+Cl^-(aq)\)

Moles of chloride ions coming from 1.60 grams of NaCl = 0.02735 mol

Total moles of chloride ion in the final solution:

\(= 0.010 mol+0.02735 mol=0.03735 mol\)

The molarity of the chloride ion in the final solution:

\(=\frac{0.03735 mol}{0.050 L}=0.747M\)

The molarity of the chloride ions in the final solution is 0.747 M.

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In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.

Photophosphorylation is the conversion of ADP to ATP by using the sunlight. the water molecules is split into the hydrogen and the oxygen this whole process is known as photolysis. In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺ known as hill reaction. The process of cooperative production of energy is called as non cyclic photophosphorylation. The proton produces by the splitting of water molecule is combine with electron reduces the NDAP to NDAPH₂.

Thus, In noncyclic photophosphorylation, electrons flow in a one-way path from water to NADP⁺.

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Answer:

Plant Adaptations is a unique feature a plant has that allows it to live and survive in its own particular habitat (the place that it lives). Desert Plant Adaptations – Plant Adaptation is really a unique have a plant has that enables it to reside and survive in the own particular habitat (the area it lives).

Explanation:

A total of 1.5 moles of ammonia (NH₃) could be produced.

To react with 56.0 g of N₂, 6.000 moles of H₂ gas are required.

A. We need to balance the chemical equation first:

N₂ + 3H₂ → 2NH₃

From the balanced equation, we can see that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.

Therefore, if 0.75 moles of N₂ are reacted with enough hydrogen gas, we can calculate the moles of NH₃ produced using the mole ratio:

0.75 moles N₂ × (2 moles NH₃ / 1 mole N₂) = 1.5 moles NH₃

Therefore, 1.5 moles of NH₃ can be produced.

B. We can use the molar mass of N₂ to convert 56.0 g of N₂ to moles:

56.0 g N₂ × (1 mole N₂ / 28.02 g) = 2.000 mole N₂

From the balanced equation, we know that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃.

Therefore, the moles of H₂ required can be calculated using the mole ratio:

2.000 mole N₂ × (3 mole H₂ / 1 mole N₂) = 6.000 mole H₂

Therefore, 6.000 moles of H₂ are needed to react with 56.0 g of N₂.

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Answer:

The molar mass of N

2

is 28 g/mol.

56 grams of N

2

=

28g/mol

56g

=2moles

At STP, 1 mole of any gas occupies a volume of 22.4 L.

2 moles of N

2

at STP will occupy a volume of 2×22.4=44.8L

Answer:

i answered your other post with it

Explanation:

Answer:

vinegar and soap

Explanation:

Answer:

vinegar and soap

Explanation: just took the test

A scientific theory is a well-supported explanation of a particular phenomenon in the natural world that is based on a body of facts that have been repeatedly verified via observation and investigation.

A scientific theory is understood in the scientific community to be a hypothesis or a collection of hypotheses regarding a phenomenon that has been verified by scientific method-based study. A hypothesis is essentially a guess.

A theory is a principle that is utilized with supporting evidence to explain a phenomenon or occurrence. Because of the findings of several tests and investigations, theories are well-established explanations that are frequently accepted by a large group of scientists and researchers.

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For the acid-base reaction between cesium hydroxide and nitric acid, the given equations are as follows:

Acid-base reactions are reaction in which acids reacts with bases to form salt and water only.

Acid-base reactions are called neutralization reactions since the acid and base are both neutralized to a neutral substance, salt.

The equations in the acid-base reaction of Cesium hydroxide (aq) and nitric acid (aq) are described below:

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Answer:

Explanation:

First we convert the given masses into moles, using the compounds' respective molar mass:

Then we multiply each amount by Avogadro's number, to calculate the number of molecules:

Answer:

101

Explanation:

Provided that

\(S_1 = S_2 = same\ V_{max}\)

And,

\(S_1\ k_M = 2.0mM\\S_2\ k_M = 20mM\)

Now we expect the same

{S} (0.1mM)

This determines that \(S_1\) generates a  higher rate of product formation as compared to the \(S_2\)

So we can easily calculate the \(V_{max}\) for either of \(S_1\) or \(S_2\) as we know that Tube 1 is \(S_2\) and tube 2 is \(S_1\)

As we know that

\(V_0 = V_{max}\ {S} / (K_M + {S})\)

As the rates do not include any kind of units so we do not consider the units for \(V_{max}\)

Now the calculation is

\(0.5 = V_{max} (0.1\ mM) / (20\ mM + 0.1\ mM)\)

\(V_{max} = 0.5 (20.1\ mM) / 0.1\ mM\)

= 100.5

≈ 101

The SI unit to the quantity it measures are:

Mass: The mass of an object is a measure of its amount of matter. The SI unit of mass is the kilogram (kg) or gram (g).

Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. The SI unit of temperature is the kelvin (K).

Time: Time is a measure of the interval between two events. The SI unit of time is the second (s).

Electric current: Electric current is a measure of the flow of electric charge. The SI unit of electric current is the ampere (A).

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Complete question:

Drag the tiles to the correct boxes to complete the pairs. Not all tiles will be used.

Match each SI unit to the quantity it measures.

The ΔS° value for the reaction KCl(s) → K+(aq) + Cl−(aq) is ΔS° > 0, as the products have a higher degree of disorder than the reactant due to an increase in the number of particles in solution. Hence the correct option is (C) ΔS° > 0.

The ΔS° value for a reaction represents the change in the entropy of the system, which is a measure of the disorder or randomness of the system. The reaction KCl(s) → K+(aq) + Cl−(aq) involves a solid compound breaking down into two separate aqueous ions, which means that the products have a higher degree of disorder than the reactant. This increase in the number of particles in solution results in an increase in entropy, which means that ΔS° > 0. Option (A) is incorrect because the reaction involves a change in state, which results in an increase in entropy. Option (B) is incorrect because it represents the relationship between enthalpy and entropy, not the ΔS° value for this particular reaction. Option (D) is incorrect because the reaction results in an increase in entropy, not a decrease. Option (E) is incorrect because the given information is sufficient to predict the sign of ΔS°.

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