I take 50.0 ml of 0.50 m hcl and add it to 150.0 ml of 0.10 m hno3. what is the ph of the resulting solution?

Common names are often used for chemical compounds instead of systematic names because they are more familiar and easier to remember for the general public. Systematic names are based on the compound's chemical structure and can be quite complex, making them difficult to pronounce and recall.

For example, the systematic name for table salt is sodium chloride, while its common name is simply salt. The systematic name for baking soda is sodium hydrogen carbonate, but it is commonly referred to as baking soda. Similarly, the systematic name for aspirin is acetylsalicylic acid, but most people know it by its common name. Another reason for using common names is that some compounds were discovered before systematic naming conventions were established, and their common names have simply stuck over time. For instance, the common name for ethyl alcohol is simply alcohol, even though it is not the only type of alcohol. While systematic names are important in the scientific community to accurately and precisely identify compounds, common names remain relevant in everyday life. They provide a simpler way to communicate about chemicals, especially for those who are not trained in chemistry.

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To find the volume of 200 grams of \(CO_2\) at 280K and 1.2 Atm pressure, we need to first calculate the number of moles of \(CO_2\) using the ideal gas law equation and then use the molar volume to find the volume of the gas.

The ideal gas law equation is given by PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature. We are given the values of pressure (1.2 Atm), temperature (280K), and the gas constant (R = 0.0821 L·atm/(mol·K)).

To find the number of moles, we rearrange the ideal gas law equation to solve for n:

n = PV / (RT)

Substituting the given values, we have:

n = (1.2 Atm) * V / [(0.0821 L·atm/(mol·K)) * (280K)]

Now we can calculate the number of moles. Once we have the number of moles, we can use the molar volume (which is the volume occupied by one mole of gas at a given temperature and pressure) to find the volume of 200 grams of \(CO_2\).

The molar mass of \(CO_2\) is 44.01 g/mol, so the number of moles can be converted to grams using the molar mass. Finally, we can use the molar volume (22.4 L/mol) to find the volume of 200 grams of \(CO_2\).

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To find the moles of MnO4 used, we first need to determine the balanced equation:
5 H2C2O4 + 2 MnO4 + 6 H+ → 2 Mn2+ + 10 CO2 + 8 H2O

From the equation, we see that 2 moles of MnO4 are needed for every 5 moles of H2C2O4. Therefore, to find the moles of MnO4 used, we need to use stoichiometry:

For the first trial, let's say we used 0.1 moles of H2C2O4. From the balanced equation, we can see that 2 moles of MnO4 are needed for every 5 moles of H2C2O4. Therefore, we can calculate:

0.1 moles H2C2O4 × (2 moles MnO4/5 moles H2C2O4) = 0.04 moles MnO4 used

Similarly, for the second and third trials, we would plug in the respective moles of H2C2O4 used and calculate the moles of MnO4 used using the same stoichiometry calculation. It is important to use a balanced equation and stoichiometry to accurately calculate the amount of reactant used in a chemical reaction.
Hi! To find the moles of MnO4- used, follow these steps:

1. Write the balanced equation for the reaction between oxalic acid (H2C2O4) and MnO4-. The equation is: 2MnO4- + 5H2C2O4 + 6H+ → 2Mn2+ + 10CO2 + 8H2O.

2. Determine the moles of oxalic acid given in the problem. Let's assume you have X moles of oxalic acid.

3. Use stoichiometry to find the moles of MnO4- used. According to the balanced equation, 5 moles of oxalic acid react with 2 moles of MnO4-. To find the moles of MnO4- needed for the given moles of oxalic acid, use this relationship:

Moles of MnO4- = (moles of oxalic acid / 5) * 2

4. Substitute the given moles of oxalic acid (X) and solve for the moles of MnO4-:

Moles of MnO4- = (X / 5) * 2

Repeat these steps 3 times with different given moles of oxalic acid to find the moles of MnO4- used for each case.

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A statement would be issued to Westfield residents stating the findings of the Reddish-Brown Substance as well as addressing the various claims.

Dear residents of Westfield,

We are writing to inform you about the recent discovery of a reddish-brown substance found in the water supply. After conducting a series of tests and observations, we have determined the identity of the substance.

Firstly, we examined the pipes in the water supply system and found that the reddish-brown substance was present in the pipes. Through analysis of the atomic-scale models, we were able to confirm that the substance found in the pipes is identical to the substance found in the water. Therefore, we make the claim that the reddish-brown substance is the same as the substance that makes up the pipes.

We also investigated whether the reddish-brown substance could be related to the fertilizer used in local agricultural practices. However, after conducting chemical analysis, we found that the reddish-brown substance does not match the composition of the fertilizer. This leads us to conclude that the reddish-brown substance is not the same as the fertilizer.

In conclusion, the reddish-brown substance found in the water supply is not the same as the substance that makes up the pipes or the fertilizer used in local agricultural practices. We apologize for any concern this may have caused and assure you that steps are being taken to address the issue.

Thank you for your attention,

Dr. Yung and team.

That is how the letter should be addressed.

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Answer:

C

Explanation:

The reaction between carbon dioxide and lithium hydroxide can be represented by the equation:

\(\displaystyle \text{CO$_2$} + 2\text{LiOH} \longrightarrow \text{Li$_2$CO$_3$}+ \text{H$_2$O}\)

We want to determine the amount of moles of LiOH needed to react completely with 25.5 g of CO₂.

Determine the number of moles of CO₂ in 25.5 g of CO₂:

\(\displaystyle 25.5\text{ g CO$_2$} \cdot \frac{1\text{ mol CO$_2$}}{44.01\text{ g CO$_2$}} = 0.579\text{ mol CO$_2$}\)

Use stoichiometry to determine the amount of LiOH necessary. CO₂ and LiOH are in a 1:2 ratio. That is, for every one mole of CO₂ that reacts, two moles of LiOH must also react.

\(\displaystyle 0.579\text{ mol CO$_2$} \cdot \frac{2\text{ mol LiOH}}{1\text{ mol CO$_2$}} = 1.16\text{ mol LiOH}\)

In conclusion, our answer is C.

Answer:

Double replacement reaction

Explanation:

This is what is known as a double replacement reaction. The two parts of each molecule separate and recombine to form two new compounds. For instance, \(Al_2(SiO_3)_3\) separates into \(Al_2\) and \((SiO_3)_3\), while \(NaOH\) separates into \(Na\) and \(OH\), and then they recombine with the other compound.

Hope this helps!

Answer:

double replacment reaction

Explanation:

srry if it is wrong

The formula equation includes all the required information of a compound. It has a fixed number of atoms and the amount in which they exist reacting.

Formulas and equations permit chemists to express chemical knowledge efficiently. Both symbol and word equations exist informative. Word equation articulates the formula of the compounds. The state of all the reactants and products exists depicted in the word equation.

A word equation exists as a chemical reaction represented in words rather than chemical formulas. A word equation should express the reactants (starting materials), products (ending materials), and direction of the reaction in a state that could be used to write a chemical equation.

The formula equation includes all the required information of a compound. It has a fixed number of atoms and the amount in which they exist reacting. It furnishes a shorter path to remembering the chemicals and their usable forms.

Whereas the word equation only maintains the nature of reactants and products. It will not provide any opinion about its actual moles and weight. Therefore, formula equations exist more meaningful than word equations.

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Answer:

1. 636miles/hour

2. 53.65milesper hour

3.696miles per hour

4.37.09mikes per hour

5. 6.99miles/hour

Explanation:

you first convert all the time into improper fractions

then work out speed which is got by dividing distance with time

Answer:

1+2=5

Explanation:

1+2=5

Answer: blowing a balloon is a physical change as when you blow a balloon the balloon expands but the balloon remains a balloon .there is change in Blowing a balloon is a physical change because only the size of the balloon changes , no change in chemical properties of the balloon occurs (no new substance is formed).

Explanation:

Using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

One key observation was the remarkable fit between the coastlines of different continents, such as South America and Africa. They noticed that the shapes of these continents seemed to match like puzzle pieces, suggesting they were once connected.

Additionally, scientists observed similar geological features across continents, such as mountain ranges and rock formations, that extended across apparent continental boundaries. They also noticed the distribution of certain plant and animal species that were found on different continents but had no means of natural dispersal.

These observations, made solely through maps, led scientists to propose the concept of continental drift, which was later supported by geological and paleontological evidence found in rocks and fossils.

Therefore, using only maps, scientists observed several lines of evidence that led them to theorize that the continents were once joined together before there was evidence from rocks and fossils.

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(A) Viscosity:the measure of how fast a fluid will flow the "thickness" of a fluid Flow Rate: the volume of fluid that passes a point in a pipe or tube in a certain amount of time.

(B) As Viscosity increases Flow Rate decreases :)

Answer:

option B and Option C

Specific heat capacity if the unknown metal is -0.450 J/(g°C).

The measure of heat complexity needed to increase the temperature of a single unit of substance mass by one degree Celsius is known as specific heat capacity. This factor is crucial in determining how much energy is required for temperature changes in a given substance.

q = mcΔT

where q is the change in thermal energy, m is the mass of the metal, c is its specific heat capacity, and ΔT is the change in temperature.

In this case, we have:

m = 150 g

ΔT = 22.4°C - 12.6°C = 9.8°C

q = -662 J

Plugging in the values,

-662 J = (150 g) c (9.8°C)

Solving for c, we get:

c = -662 J / (150 g × 9.8°C) = -0.450 J/(g°C)

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To determine whether the protein is an enzyme, the scientist should primarily measure the rate of the chemical reaction. Option(b)

Enzymes are specialized proteins that act as catalysts, facilitating chemical reactions by lowering the activation energy required for the reaction to occur. By comparing the rate of the chemical reaction with and without the protein, the scientist can determine if the presence of the protein enhances the reaction rate. If the reaction proceeds at a significantly higher rate in the presence of the protein, it suggests that the protein is acting as an enzyme, catalyzing the reaction. Enzymes typically accelerate reaction rates by providing an alternative reaction pathway with a lower activation energy, allowing the reaction to occur more readily. While measuring the amount of protein consumed may provide information about the protein's involvement in the reaction, it does not directly determine whether the protein is an enzyme. Similarly, measuring the amount of products bound to the active site or the temperature change of the reaction can provide additional insights, but they alone are not sufficient to confirm enzymatic activity. The most reliable indicator to ascertain whether the protein is an enzyme is to compare the rate of the chemical reaction in the presence and absence of the protein. Option(b)

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Answer:

Vanillin consists of molecules. The attraction between particles of silver iodide is stronger than the attraction between particles of vanillin.

The silver iodide a compound used in photography because,

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The balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

Given equation: 3O2+4Co⟶2Co2O3Using the symbol e− for an electron. The redox reaction can be broken down into two half-reactions. The reduction half-reaction is the one in which a species gains electrons and the oxidation half-reaction is the one in which a species loses electrons. The half-reactions are as follows: Reduction Half-reaction Half-reaction equation: O2 + 2e- → 2O2 -Oxidation number of oxygen in O2=0 and in O2^-= -1Charge on the left side = 0Charge on the right side = 2 x (-1) = -2Thus, 2 electrons are added to the left side to balance the charge, making the half-reaction:O2 + 2e- → 2O2 -Oxidation Half-reaction Half-reaction equation: 4Co → 4Co2+ + 8e-Oxidation number of cobalt in Co=0 and in Co2+ =+2Charge on the left side = 0Charge on the right side = 4 x (+2) + 8 x (-1) = -4Thus, 8 electrons are added to the right side to balance the charge, making the half-reaction:4Co → 4Co2+ + 8e-Thus, the balanced half-reactions are: Oxidation half-reaction: 4Co → 4Co2+ + 8e-Reduction half-reaction: O2 + 2e- → 2O2 -

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Answer:

I think 7, 4, 6, or 8

I think that one of those is correct

Explanation:

The approximate value of b, rounded to the nearest tenth, is 8.6 units.

To round to the nearest tenth, we look at the hundredths place. In this case, the hundredths place digit is 4, which is less than 5. Therefore, we leave the tenths digit (in this case 6) as it is, and drop all the digits to the right of it. So, the rounded value of b is 8.6 units.

Since the given options for the value of b are 7.2 units, 7.8 units, 8.6 units, and 9.4 units, and you're looking for the nearest tenth, you can identify 7.8 units as the value closest to the whole number (7) with a tenth-place value.

After considering the options provided, the closest value of b to the nearest tenth is 7.8 units.

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Graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.

Unbound can serve as a caching server, it can also perform recursion, store records obtained from other DNS servers, and provide an authoritative service, such as if you only have a few zones.

As a result, it can act as a "glue" server or host a small zone with only a few domains, making it ideal for a lab.

Why need to utilize Unbound DNS?

With its harden-glue, access control, maximum randomization for request ID and ports, response scrubbing, case preservation, plus Denial of Service or DoS prevention capabilities, Unbound is feature-rich with DNS Security. These are only a few.

Therefore, graphite is a fantastic lubricant and a powerful electrical conductor because of these unbound electrons.

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Taking into account the direction the meter points will be from left to right, the copper (||) ions are being reduced and Zn is being oxidized in the zinc and copper galvanic cell.

The direction of the flow of elections will be indicated by the direction of the needle, which will move from left to right. At this point, oxidation takes place at the Zn electrode, resulting in the release of e-, whilst the reduction of Cu+2 ion takes place at the Cu electrode, leading to the movement of electrons from left to right.

The correct answer is that the copper (||) ions are being reduced while the zinc ions are being oxidized.

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Answer:

Because Argon is a inert gas

Explanation:

Inert gases don't take place in any experiments

Answer:

Below.

Explanation:

The sodium reacts strongly with the chlorine to form NaCl and the heat of reaction continues the brightness, whereas it does not react with the inert gas  argon and soon cools down.

To answer your question, we first need to understand that NH4Cl is a salt that dissociates in water, producing NH4+ and Cl- ions. However, NH4+ can also act as an acid and donate a proton to water, producing H3O+. Therefore, we need to consider the equilibrium reactions that occur in the solution of NH4Cl.

NH4+ + H2O ⇌ NH3 + H3O+

In this reaction, NH4+ is acting as an acid and donating a proton to water, producing NH3 and H3O+. The equilibrium constant for this reaction is called the acid dissociation constant (Ka) for NH4+ and is given by:

Ka = [NH3][H3O+] / [NH4+]

Since NH4Cl dissociates completely in water, the initial concentration of NH4+ is equal to the concentration of NH4Cl, which is 0.060 M. We can assume that the concentration of NH3 produced is negligible compared to the initial concentration of NH4+, so we can simplify the equilibrium expression to:

Ka = [H3O+] / [NH4+]

Substituting the given value for Ka (5.6 x 10^-10) and the initial concentration of NH4+ (0.060 M) into the equation, we get:

5.6 x 10^-10 = [H3O+] / 0.060

Solving for [H3O+], we get:

[H3O+] = 6.6 x 10^-6 M

Therefore, the [H3O+] in 0.060 M NH4Cl is 6.6 x 10^-6 M.

In summary, the [H3O+] in a solution of NH4Cl can be calculated using the acid dissociation constant (Ka) for NH4+. Since NH4+ can act as an acid and donate a proton to water, we need to consider the equilibrium reaction between NH4+ and H2O. The [H3O+] can then be calculated using the initial concentration of NH4+ and the value of Ka. The calculated value for [H3O+] in 0.060 M NH4Cl is 6.6 x 10^-6 M.

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The bromine atom in the center, connected to each oxygen atom with a single bond, and each oxygen atom having two lone pairs of nonbonding electrons. The formal charges of the atoms are Br: +1, O: -1.

The BrO2 molecule consists of one bromine atom (Br) and two oxygen atoms (O), connected by single bonds. The oxygen atoms each have two nonbonding electrons, which are represented as lone pairs on each oxygen atom.

To draw the molecule, you would place the bromine atom in the center of the grid, and connect it to each oxygen atom with a single bond. Then, you would place the two lone pairs on each oxygen atom, so that they each have a total of eight valence electrons.

The formal charges of the atoms can be calculated by subtracting the number of valence electrons in the unbonded atom from the number of electrons in the bonded atom. For example, the bromine atom has seven valence electrons, and is bonded to two oxygen atoms (each with six valence electrons). This gives the bromine atom a formal charge of +1. Each oxygen atom has six valence electrons, and is bonded to one bromine atom and has two lone pairs, giving each oxygen atom a formal charge of -1.

So the correct structure of BrO2 would look like this:

           O
           |
       Br--O
           |
           O

With the bromine atom in the center, connected to each oxygen atom with a single bond, and each oxygen atom having two lone pairs of nonbonding electrons. The formal charges of the atoms are Br: +1, O: -1.

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Explanation:

Technically, the ice cube melts because the water cools down. This may sound ridiculous at first, but you must consider the fact that the ice melts because it has drawn "heat" (energy) from its surroundings. The "surroundings" being the air and water that surround it (but the water's more important since it's a better conductor of thermal energy).

The surrounding air looses energy while the ice in the glass gains energy.

We know that thermal energy is transferred from a hotter body to a cooler body. If we look as the glass, we will notice that the surrounding air has a greater energy compared to the contents of the glass. The surrounding air looses this energy resulting in the condensation of water vapor in air around the glass.

Similarly, the ice in the glass gains energy and melts. A change of state occurs from solid to liquid as a result of the energy absorbed from the surrounding air.

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70°C, 95.6 grams of the unknown solute can dissolve in 141.9 grams of water.

The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Variable compounds have very varying solubilities, which is a characteristic of a particular solute-solvent pair.

mass of solute = (mass of water) x (solubility of solute in water)

First, we need to convert the solubility from grams of solute per 100 grams of water to grams of solute per gram of water:

67.3 g/100.0 g = 0.673 g/g

Now we can plug in the values to get:

mass of solute = (141.9 g) x (0.673 g/g) = 95.6 g

Therefore, at 70°C, 95.6 grams of the unknown solute can dissolve in 141.9 grams of water.

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the predominant forces in each of the following compounds are as follows: CaCl₂: ionic forces, H₂O: hydrogen bonding, NH₄: van der waals interaction, CH₄: vander waals interaction, NH₃: hydrogen bonding. these forces are based on the type of molecule or compound.

calcium chloride is an ionic compound and hence the interaction between its molecules is ionic. the bond formed between calcium chloride is formed by donation an acceptance of electron pair i.e ionic bond formation which is a strong bond.

water and NH₃ are polar molecules and also show hydrogen bonding between its molecules. oxygen forms hydrogen bond with hydrogen of another water molecule whereas nitrogen forms hydrogen bond with H of another NH₃ molecule. CH₄ and NH₄ are neutral molecules and hence have van der waals interaction.

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The  theoretical yield of the solution has been obtained as  17.1 g

Let us recall that each time that we hear about a chemical reaction what we are talking about is the combination of two or more reactants and a product must be formed. In this case we are to find the theoretical yield of this reaction.

We have been told that the HCl is in excess thus we have the 2-methyl-2-butanol as the limiting reactant.

Mass of the solution = density * volume

Mass of the solution = 0.805 g/ml * 17.6 ml

= 14.2 g

Number of moles = mass/molar mass

= 14.2 g/88 g/mol

= 0.16 moles

Given that the reaction is 1:1, 0.16 moles of the product is obtained.

Theoretical yield = Number of moles products * molar mass of products

= 0.16 moles * 106.59 g/mol

= 17.1 g

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The property of water that allows it to dissolve many substances is its polarity.

What is polarity?

Polarity refers to the distribution of electrical charge in a molecule. A polar molecule has an uneven distribution of electrons, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end. This creates a dipole moment in the molecule.

Water molecules are polar, meaning that the electrons in the molecule are not distributed evenly, resulting in a partial positive charge on one end of the molecule and a partial negative charge on the other end.

This polarity allows water molecules to form hydrogen bonds with other polar or charged molecules, such as ions and polar compounds. This type of bonding allows many substances, such as salt and sugar, to dissolve in water.

Additionally, the polarity of water molecules also allows them to interact with nonpolar substances through London Dispersion Forces, which also allows some nonpolar substances to be dissolved in water.

Hence, the polarity of water allows it to dissolve many substances.

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