‏How many grams of KMnO , are needed to make 500.0 mL of a 0.200 M solution ?

Answer:

1.3g of Na

Explanation:

We'll begin by calculating the molar mass of sodium benzoate, NaC7H5O2. This is shown below:

Molar Mass of NaC7H5O2 = 23 + (12x7) + (5x1) + (17x2)

= 23 + 84 + 5 + 32

= 144g/mol

Now, we can obtain the mass of sodium, Na present in 8.4g of sodium benzoate, NaC7H5O2 as follow:

There are 23g of Na in 144g of NaC7H5O2.

Therefore, the mass of Na in 8.4g of NaC7H5O2 is given by:

23/144 x 8.4 = 1.3g.

Therefore, 1.3g of Na is present in 8.4g of sodium benzoate, NaC7H5O2.

Answer:

A. Water

Explanation:

Virtually every known substance can be referred to as MATTER, as long as it has weight and occupies space. Matter can exists in three different forms namely: solid, liquid and gaseous states.

However, each state of matter has its own unique property that characterizes it. WATER is the only matter that can exists in the three different states as follows:

- LIQUID - WATER

- SOLID - ICE

- GASEOUS - STEAM OR VAPOUR.

The answer is  21.5 L ,So, start with the balanced chemical equation for the decomposition of hydrochloric acid.

An liquid solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odour and is translucent. It is categorised as a powerful acid. In the digestive processes of the majority of mammal species, including humans, it is a part of the gastric acid. A crucial commercial substance and reagent for laboratories is hydrochloric acid.

Chemical burns from hydrochloric acid can be extremely painful if they come into touch with skin or other organs. Ingestion of hydrochloric acid can result in blindness. The concentration of the acid and how long it remains in touch with the organs determine how severe the burns are.

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Answer:

0.9192mol

Explanation:

2 FeCl2 + Cl2 → 2 FeCl3

Cl2       :       FeCl3

1            :      2

X           :      1.8384

X= 1.8384/2

X= 0.9192

I hope it helps :)

We can see here that the best fuel is the one that produces the most heat per unit mass. In this case, the fuel that produces the most heat per unit mass is methanol.

Fuel is a substance that is used to produce energy through combustion or other chemical reactions. It is commonly utilized to power various forms of transportation, generate heat or electricity, and operate machinery and appliances.

The results of the experiment are shown below:

Fuel            Mass (g)      Heat produced (J)       Heat per gram (J/g)

Methanol 1.0                          350                   350

Ethanol         1.0                          250                   250

Propane         1.0                          200                   200

Butane         1.0                          150                            150

Pentane         1.0                          100                            100

It is important to note that the results of this experiment are only a measure of the heat produced by the fuels.

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To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.

To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.

If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).

However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.

In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.

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The molar mass of saccharin is 0.900 g / [Sac].

Saccharin is a weak organic base with a K​b of 4.80 × 10-3 and we are given that a 0.900-g sample of saccharin dissolved in 45.0mL of water has a pH of 12.310.

We are supposed to calculate the molar mass of saccharin.

The formula for finding the molar mass of a substance is:Molar mass = (mass of substance) / (number of moles).

We are given that the Kb of saccharin is 4.80 × 10-3.

Since it is a base, it reacts with water to form the conjugate acid of saccharin (HSac) and hydroxide ions (OH-).

The balanced chemical equation for this reaction is: C7H4NO3S + H2O → HSac + OH-.

We can use the Kb value to find the concentration of the hydroxide ions produced:Kb = [HSac][OH-] / [Sac].

Initial concentration of saccharin, [Sac] = (0.900 g) / (Molar mass) = 0.900 / M Molar mass = 0.900 / [Sac].

Now we can use the given pH value to find the concentration of the hydroxide ions using the expression:pH = 14 - pOHpOH = 14 - pH[OH-] = 10^-pOH.

Substitute these values in the expression for Kb and solve for [HSac]:Kb = [HSac][OH-] / [Sac][HSac] = (Kb x [Sac]) / [OH-]

Now we can substitute the values we have into the expression for the molar mass:Molar mass = (mass of substance) / (number of moles)Number of moles = [Sac]Molar mass = 0.900 / [Sac].

Therefore, the molar mass of saccharin can be calculated by first finding the concentration of hydroxide ions produced using the pH value, then using the Kb value to find the concentration of the conjugate acid of saccharin, and finally using these values to find the molar mass of saccharin using the formula Molar mass = (mass of substance) / (number of moles).

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Answer:

1.2506

Explanation:

Answer:

I would say B but I'm not completely sure so I'd wait for someone else's answer :)

Answer:

Neutral solutions have an equal number of H+ ions and OH- ions. Acidic solutions have a higher H+ concentration. An acid is a substance that releases H+ when dissolved in water. Basic solutions have a low H+ concentration.

Amount of heat required to raise the temperature of 4.516 g sample from 41.2°C to 66.6°C  is 406748 J.

Specific heat of a substance is defined as the amount of heat required to raise the temperature when one gram of substance is present by one degree Celsius.

Concept of specific heat was discovered when it came to notice that different substances require different amount of heat to raise the same amount of temperature.

It is usually given by the equation,

Q=mcΔT

where Q= heat

m=mass and c= specific heat

ΔT= change in temperature

For the given example, amount of heat is calculated by substituting the values in above equation

Q=4.516×3546.21×25.4=406748 J.

where,0.847 cal/g°C=3546.219 J/kgK

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In a  voltaic cell, if we attach the negative terminal of a dry cell (1.5 V) to the cell cathode and the positive terminal to the cell anode, there will be oxidation of the Cd and reduction of Cr

What is meant by voltaic cells?

A voltaic cell is an electrochemical cell that produces electrical energy using a chemical reaction. The reactions to oxidation and reduction are divided into half-cell compartments.

The oxidation occurs in the Cd electrode, which is the anode, and it gets oxidized to Cd²⁺ (aq). Hence, the Cd electrode loses mass as the cell reaction moves forward.  

A voltaic cell is an electrochemical cell that uses a chemical response to produce electric energy. The crucial components of a voltaic mobile: The anode is an electrode where oxidation occurs. The cathode is an electrode where a discount occurs. A galvanic cell or voltaic cellular, named after the scientists Luigi Galvani and Alessandro Volta, respectively, is an electrochemical cellular wherein an electric-powered modern is generated from spontaneous Oxidation-reduction reactions.

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Answer:

163 kilograms per cubic feet.

Explanation:

To solve this problem, first we convert 5.77 g/cm³ to kg/cm³:

Then we convert kg/cm³ to kg/ft³, by converting cm³ to ft³:

So the density is 163 kilograms per cubic feet.

Based on the evidence in the solubility graph, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.

An unsaturated solution is a solution which contains less solute than it can actually dissolved in a given volume of solvent at a given temperature.

A solubility curve or graph provides information about the solubility of a solute at a given temperature.

From the solubility graph given, at 20°C, less than 10 g of Ce2(SO4)3 will be dissolved in 100 mL of water.

Therefore, when 10 g of Ce2(SO4)3 is dissolved in 100 mL of water at 20°C, the solution is said to be saturated.

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Answer:

Part A: (on left side)

Part B: (on the right side)

Here is the thing, for a chemical equation, both sides have same number of atoms, even though the compounds are different

Stars form in large, dense regions of gas and dust known as molecular clouds. These clouds are located primarily in the spiral arms of galaxies, where they are exposed to intense radiation from nearby stars. As the gas and dust in these clouds are subjected to this radiation, they begin to collapse under their own gravity. As the collapse continues, the cloud becomes denser and denser, and eventually a protostar forms at its center. Over time, this protostar continues to contract and heat up, eventually reaching the point where nuclear fusion can begin in its core. At this point, the protostar becomes a fully-fledged star, and the process of star formation is complete.

TL;DR: Within the clouds of dust and scattered throughout most galaxies.

When ions with opposing charges attract, an ionic compound is created. Although it contains charged particles, an ionic substance is overall neutral.

Ions are charged particles that form when an atom (or group of atoms) receives or loses an electron, and ionic compounds are composed of these charged particles. An anion is a negatively charged ion, whereas a cation is a positively charged ion.

For example, table salt or sodium chloride are two-element ionic compounds. Here, an ionic bond is created when the sodium ion, Na+, attracts the chlorine atom (ion), C l -, which has a negative charge.

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The 250 mL solution of 0.10 M HCl contains 0.9115 g of HCl in total.

For acid-base reactions, raffination, and pH control, 0.1M hydrochloric acid is frequently employed. Every educational setting can employ this chemical.

Moles of solute (n) / volume of solution Equals molarity (M) (V)

If we rewrite this formula, we obtain:

moles of solute (n) = Molarity (M) x volume of solution (V)

Substituting the given values, we get:

moles of HCl = 0.10 M x 0.250 L = 0.025 moles

The molar mass of HCl, 36.46 g/mol, may be used to determine its mass. The formula is as follows:

mass of solute (m) = moles of solute (n) x molar mass (M)

When we change the values, we obtain:

mass of HCl = 0.025 mol x 36.46 g/mol

= 0.9115 g

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Answer:

chromotagry magnetism

Explanation:

Paper clips are magnetic pennies are not so it wouldn't affect the pennies or salt.

Answer:

D OR A  but i think its a  BC YOU CAN filter the salt and pennies

Explanation:

The gaseous molecules are only present in Sketch A in the proper form/state as predicted by the temperature!

Based on the original supposition that all processes or CO states exist at normal atmospheric pressure and temperature circumstances! Sketch A is at -174°C, Sketch B is at -211°C, and Sketch C is at -200°C in the graphic accompanying this solution. However, CO has a boiling point of -192°C, which means that at this temperature, CO molecules transition from a liquid state in which they are largely free to move around and are practically incompressible to a gaseous state in which they are completely free to move around.

Its melting point is -205°C, which is the point at which CO molecules transition from their ordered solid state, in which movement is entirely limited to vibrations, to their more free-flowing liquid state.

According to this interpretation, CO molecules exist as an ordered solid at temperatures lower than -205°C. CO molecules exist as a reasonably free liquid between -205°C and -192°C, and at temperatures above -192°C, they exist as a gas that is completely free to move around. Sketch A of the drawings included with this solution clearly depicts carbon monoxide molecules in their very liberating gaseous state. CO molecules are depicted in Sketch B in an extremely ordered solid state. Sketch C, however, depicts CO molecules in their somewhat unrestricted form (that is, liquid form).

The CO molecules are only present in drawing A in the predicted form and state for the temperature!

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The CO molecule has two atoms: C and O. Atoms C and O. One oxygen atom and one carbon atom make up carbon monoxide, which is further joined by a triple link made up of two covalent bonds and one dative covalent bond. Carbon monoxide's chemical name is represented as CO.

The most typical signs of CO poisoning include headache, dizziness, weakness, nausea, upset stomach, and confusion. CO symptoms are frequently referred to as "flu-like." If you inhale a lot of CO, you risk losing consciousness or perhaps dying. Headaches, tiredness, and nausea are the most common side effects of modest carbon monoxide exposure. Sadly, because they frequently resemble the flu, the symptoms are readily missed. You may have a pounding headache, tiredness, disorientation, and an increased heart rate as a result of medium exposure. The signs of exposure to low amounts of carbon monoxide may resemble those of the flu and food poisoning. Carbon monoxide poisoning, however, does not result in a high temperature, unlike the flu (fever).

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The mass of 2.40 × 10²³ molecules of anonymous substance with molar mass of 18.02g/mol is 7.18grams.

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:

mass = no of moles × molar mass

First, we convert the number of molecules in the anonymous substance to moles as follows:

2.40 × 10²³ ÷ 6.02 × 10²³ = 0.39moles

mass of anonymous substance = 0.39 moles × 18.02g/mol = 7.18grams

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Answer:

Ions.

Explanation:

Hello!

In this case, since iron is a metal which has lots of uses in the design of metallic alloys and materials, when it is at its ground state we say it is just Fe; however, since it is a metal, it is very likely to lose electrons and therefore getting positively charged as +2 or +3, say:

\(Fe^{2+}\\\\Fe^{3+}\)

Thus, since they are positively charged, they are classified as cations, which are ions.

Best regards!

Answer:

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

Explanation:

they are the only two of the options that contain a sulfide ion (S) therefore they are the only ones that could be considered in the question.

b) Li2S(aq)+Pb(NO3)2(aq)

e) K2S(aq)+Sn(NO3)4(aq)

The compound that is a base from the given list is Ca(OH)2. Option 2.

What is a base?

A base is a chemical substance that produces hydroxyl ions as the only negative ion in aqueous solutions.

Ca(OH)2 is calcium hydroxide, which is a chemical compound consisting of one calcium ion (Ca2+) and two hydroxide ions (OH-).

It is classified as a base because, when it dissolves in water, it produces hydroxide ions that can accept protons (H+) from acids in a process known as a neutralization reaction.

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As the molality of the saltwater solution increases, the students are likely to observe that the freezing point of the solution decreases. Molality is a measure of the concentration of a solute in a solvent, and it is defined as the number of moles of solute per kilogram of solvent. Increasing the molality of a saltwater solution means adding more salt to a given amount of water, which increases the concentration of the solute and therefore lowers the freezing point of the solution.