the following boiling points, only one forms a chloride that is ionic in nature, which element is it?
A)Element A with boiling point 243 C
B)Element B with boiling point 458 C
C)Element C with boiling point 987 C
D)Element D with boiling point 196 C

Answer:

we have four moles in 56L of co2

The initial concentrations of the NaOH and HCl are given as 0.1 mol/L and 0.1 mol/L, respectively. We need to convert these concentrations to molarity (mol/L) by dividing by the molar mass of the substance. So,  pH of the resulting solution is 0.000003 or 0.003.  

The molar mass of NaOH is 40 g/mol, and the molar mass of HCl is 33.5 g/mol.

Therefore, the initial molarities of NaOH and HCl are:

NaOH: 0.1 mol/L / 40 g/mol = 0.0025 mol/L

HCl: 0.1 mol/L / 33.5 g/mol = 0.003 mol/L

When NaOH and HCl are mixed, they will react to form water (H2O) and NaCl. The balanced chemical equation for this reaction is:

NaOH (aq) + HCl (aq) -> NaCl (aq) + H (l)

We need to calculate the number of moles of H+ ions that are present in the solution. The number of moles of H+ ions is equal to the number of moles of HCl that are present in the solution.

The molarity of HCl is 0.003 mol/L, so the number of moles of HCl is:

0.003 mol/L * 1 L = 0.000003 mol

The number of moles of H+ ions is the same as the number of moles of HCl. Therefore, the concentration of H+ ions in the solution is:

Concentration of H+ ions = Number of moles of H+ ions / Volume of solution

Concentration of H+ ions = 0.000003 mol / 1 L = 0.000003 mol/L

The pH of the solution is the negative logarithm of the concentration of H+ ions. The pH of a solution is defined as:

pH = -log[H+ ions]

Substituting the value of the concentration of H+ ions, we get:

pH = -log[0.000003 mol/L]

pH = 0.000003

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Answer:

pH= 12.52

Explanation:

First, calculate the moles of acid in the solution:

(0.050 L)(0.10molL)=0.0050 mol acid

Next, calculate the moles of base:

(0.100 L)(0.100molL)=0.0100 mol base

The strong acid and strong base will dissociate completely to generate the same number of moles of hydronium and hydroxide, respectively. The amount of base exceeds the amount of acid, so all of the hydronium will be neutralized, leaving an excess of hydroxide. To find the remaining amount of hydroxide, we subtract the moles of hydronium added (equal to the moles of hydroxide neutralized) from the moles of hydroxide added:

0.0100 mol OH−−0.0050 mol H3O+=0.0050 mol OH−

To find the concentration of hydroxide, we must divide this number of moles by the total volume of solution, being sure to add the volumes of acid and base added together:

0.0050 mol OH−0.150 L=0.033 M OH−

Take the negative logarithm of this concentration to obtain the pOH:

-log(0.033)=1.48

Finally, to obtain the corresponding pH, subtract this number from 14.00:

14.00−1.48=12.52

Answer:Solution A has 10 times more hydrogen ions than solution B.

The spontaneity of a reaction is determined by the Gibbs free energy change (∆G), which is a measure of the system's ability to do work.

The equation that links ∆G, ∆H, and ∆S is: ∆G = ∆H - T∆S, where T is the temperature in Kelvin and ∆H and ∆S are the enthalpy and entropy changes, respectively. The signs of ∆H and ∆S determine whether the reaction is exothermic or endothermic and whether it is entropy-driven or enthalpy-driven, respectively.

If ∆G is negative, the reaction is spontaneous, meaning it occurs without the input of energy.The given reaction has a ∆H of 23.25 kJ and a ∆S of 161.26 J/mol∙K.

First, we need to convert the units of ∆S from J/mol∙K to kJ/mol∙K by dividing by 1000.∆S = 161.26 J/mol∙K ÷ 1000 = 0.16126 kJ/mol∙K Substitute the values into the equation to determine the spontaneity of the reaction:

∆G = ∆H - T∆S∆G = (23.25 kJ) - (298 K) x (0.16126 kJ/mol∙K)∆G = 23.25 kJ - 48.02 kJ∆G = -24.77 kJ Since ∆G is negative, the reaction is spontaneous.

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The first step in this calculation is to know how many liters is equal to 1 gallon, and the value is 3.785 liters, so now we have to make the following calculation:

1 gal = 3.785 Liters

30.0 gal = x Liters

x = 3.785 * 30.0

x = 114 Liters

Answer:

A.

Explanation:

The melting of wax is just a physical change, not a chemical one, since melted wax can still reharden and go back to its original state. All the other choices are non-reversible, chemical changes.

Hopefully this helps- let me know if you have any questions!

Answer:

Melting of candle wax when heated

Explanation:

So what's the difference

We can get candle wax back when we melted it so it's physical reaction

The volume of the gas is obtained as 5.99 L.

The ideal gas equation is used to predict how ideal gases will behave in various scenarios and describes the relationship between the physical properties of gases. The equation takes the ideal behavior of gases as a given.

We know that the number of moles = mass/Molar mass

= 12.5 g/44 g/mol

= 0.28 moles

Using;

PV = nRT

V = nRT/P

V = 0.28 * 0.082 * 313/1.2

V = 5.99 L

Th new volume of the gas is 5.99 L

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The statements that are true regarding a catalyst are as follows:

It undergoes no permanent change during a reaction

It does not participate in a chemical reaction

What is a catalyst?

A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

A catalyst increases the rate at which a chemical reaction occurs by decreasing the activation energy of the reaction.

Since a catalyst is not used up in the reaction, the following statement applies:

It undergoes no permanent change during a reaction

It does not participate in a chemical reaction

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Decomposition reaction results in the formation of the products by splitting the reactants. Moles of mercury(ii) oxide needed are 15.63 moles.

Moles are the ratio of mass and the molar mass of the compound or the molecule.

Moles of oxygen are calculated as:

\(\begin{aligned}\rm n &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{250}{32}\\\\&= 7.8125 \;\rm moles\end{aligned}\)

The balanced chemical reaction can be shown as,

\(\rm 2HgO \rightarrow 2Hg + O_{2}\)

From the reaction, it can be said that 1 mole of oxygen requires 2 moles of mercury oxide.

Moles of mercury oxide are calculated as:

\(\begin{aligned} \rm n HgO& = (7.8125 \;\rm moles \; O_{2}) \times (\dfrac{2 \;\rm moles\; HgO}{1 \;\rm mole \; O_{2}})\\\\\rm n HgO &= 15.625 \;\rm moles \end{aligned}\)

Therefore, option C. 15.63 moles of mercury (II) oxide is needed.

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Answer:

Hypothesis

Explanation:

A hypothesis is a statement that proposes an explanation to an observed phenomenon that can be verified by setting up a scientific test in order for the hypothesis to become classified as correct and verified when the test data supports the hypothesis or when the data and the hypothesis are not in agreement, another hypothesis may need to be developed.

Answer:

hypothesis

got it right edg2021

Answer:

Explanation:

1. a student conduct an experiment she found that her actual yield was

20g. the theoretical yield for the experiment is 25g. calculate the percent

yield for the reaction

Answer:

The answer should be that a constant pressure is applied to both cylinders and they are balanced chemical equations for the reaction between nitrogen oxygen.

Explanation:

what is a chemical reaction?

A chemical reaction is a process in which one or more reactants are transformed into one or more products. Chemical elements and compounds are both substances. The component atoms of the reactants are rearranged in a chemical reaction, resulting in distinct compounds as products.

Answer:

Book on Table

Car at the Hilltop

Falling Objects

Skydiver

Hammering a Nail

Dam Water

Roller Coaster

Stretched Rubber Band

Simple Pendulum

Compressed Spring

Battery

Flashlight

Exothermic Chemical Reaction

Burning of Oil, Gas and Coal

Wind Turbine

Explanation:

have a nice day!

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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The compound that will readily react with the solution of bromine resulting from the mixture of hydrobromic acid and hydrogen peroxide is option (a) Cyclohexene.

A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.

Free bromine (Br2), a potent electrophilic and oxidizing agent, can be produced in situ by mixing hydrobromic acid (HBr) and hydrogen peroxide (H2O2). So, we must choose a substance that Br2 can easily react with in these circumstances.

Cyclohexene, one of the provided compounds, is an unsaturated double-bonded molecule that can go through electrophilic addition processes. With alkenes like cyclohexene, bromine easily engages in an electrophilic addition process to generate a dibromoalkane.

Hence, option (a) cyclohexene is the substance that will most rapidly react with the bromine solution produced by the mixture of hydrobromic acid and hydrogen peroxide.

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Answer:

Because it serves their agenda.

The 0.118 moles are the mass Iron(III) oxide reacts with carbon monoxide gas to form solid iron metal and carbon dioxide gas: Fe2O3+3CO→2Fe+3CO2.

Limiting and Excess Reactants:There are sorts of reactants which can be utilized in a chemical response process, those are the proscribing reactant and the extra reactant. There is continually a leftover quantity of the extra reactant after a response. The most quantity of merchandise that may be produced relies upon at the proscribing reactant.

First, we convert the loads of the reactants into moles the usage of their molecular weight:

Solving for moles of Fe2O3, nFe2O3,

nFe2O3=mFe2O3MWFe2O3=23.0g159.69gmolnFe2O3=zero.144molesSolving for moles of CO, nCO,nCO=mCOMWCO=15.4g28gmolnCO=zero.55molesIn figuring out the proscribing and extra reactants, we decide the moles required for every reactant if we used all of the given moles adjusted consistent with their mole ratio withinside the balanced response.

The moles ecess reactant =nCO−nCOx=zero.fifty five−zero.432=0.118 molThe mass of the extra reactant left is calculated the usage of its moles and molecular weight,

massexcessreactantleft=mCO×M.

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Answer:

The reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

Explanation:

The reactants in this chemical reaction are copper and oxygen. When copper reacts with oxygen in the air, it forms a new green substance called copper oxide (CuO).

There are several indicators of a chemical reaction that can be observed during this process. The first indicator is a change in color. In this case, the copper metal changes from its original reddish-brown color to a greenish-blue color as it reacts with oxygen to form copper oxide. This change in color is due to the formation of a new substance with different properties than the original reactants.

Another indicator of a chemical reaction is the release or absorption of energy in the form of heat, light, or sound. In this case, the reaction between copper and oxygen is exothermic, meaning that it releases heat energy. This can be observed by feeling the warmth produced by the reaction.

A third indicator of a chemical reaction is the formation of a precipitate or gas. In this case, no precipitate is formed, but a gas (oxygen) is consumed during the reaction.

Finally, a chemical reaction often involves a change in physical properties such as density, melting point, or boiling point. In this case, copper oxide has different physical properties than copper metal, such as being less dense and having a higher melting point.

In summary, the reactants in this chemical reaction are copper and oxygen, and the indicators of the chemical reaction include a change in color, release of energy in the form of heat, consumption of gas (oxygen), and a change in physical properties.

Balanced chemical equation is the equation in which the number of atoms of each type in the reaction is the same on both sides i.e., reactant side and product side. In a balanced chemical reaction mass of both the sides of the reaction are equal.

1. MgO + HBr → MgBr₂ + H₂O

Balanced chemical reaction:

MgO + 2HBr → MgBr₂ + H₂O

2. N₂ + O₂ → N₂O₂

Balanced chemical reaction:

N₂ + O₂ → N₂O₂

3. C₂H₄ + O₂ → CO₂ + H₂O

Balanced chemical reaction:

C₂H₄ + 3O₂ → 2CO₂ + 2H₂O

4. Fe + HCl → FeCl₂ + H₂

Balanced chemical reaction:

Fe + 2HCl → FeCl₂ + H₂

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First, we define density as:

Density = mass/volume;

We focus first on the volume of air in the room.

Volume:

We have the measurements of where the air is.

We calculate the volume with these measurements, but first, we change the units to L:

1 inch = 2.54 cm

1 L = 10^3 cm^3

1 ft = 12 inch

Now,

11.0 ft x (12 in/1 ft) x (2.54 cm/1 in) = 335.28 cm

12.0 ft = 365.76 cm

10.0 ft = 304.8 cm

Therefore, the volume of the room = 335.28 cm x 365.76 cm x 304.8 cm

Volume = 37378237.5 cm^3 x (1 L/10^3cm^3) = 374 x 10^2 L

From the Density equation, we clear the mass:

Density x volume = mass (g)

1.19 g/L x 374x10^2 L = 445x10^2 g x (1 kg/1000 g) = 44.5 kg

Answer: 44.5 kg

Answer: False

Explanation: Gaining an electron which has a negative charge results in an overall negative charge, thus making this an anion, and the answer, false.

Answer:false

Explanation:it becomes a anion

The purchase process involves steps such as initiating a request, vendor selection, approval, purchase order issuance, product delivery, and payment, ensuring a systematic approach to procurement for accountability and efficiency.

The purchase process consists of several steps:

1. The department admin initiates the process by sending a purchase request to the IT department.
2. The IT Manager reviews the request and decides whether to approve or reject it.
3. If the request is approved, the IT Manager contacts various vendors, such as Apple, Dell, HP, ASUS, and Lenovo, to request quotes.
4. The IT Manager receives the quotes and selects the best price.
5. Once the best price is selected, the IT Manager informs the admin and waits for their approval.
6. If the admin approves, the IT Manager finalizes the vendor selection and prepares the purchase request.
7. The IT Manager then sends the purchase request to the Procurement Supervisor.
8. The Procurement Supervisor receives the request and issues a purchase order to the chosen vendor.
9. The Procurement Supervisor reviews the vendor's invoice and processing time.
10. If the processing time elapses and the tracking number has not been received, the Procurement Supervisor cancels the order.
11. If the vendor provides the tracking number within the processing time, the Procurement Supervisor collects the product once it is delivered.
12. At the same time, the Procurement Supervisor submits the payment to the vendor.
13. Once both steps are completed, the purchase process is considered finished, and the purchase is completed.

This process ensures that there is a clear and systematic approach to purchasing items, from the initial request to the final delivery and payment. Each step is important in maintaining accountability and efficiency in the procurement process.

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Answer:

Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. Electricity is the flow of electrons or ions.

Explanation:

hope it helped:)))))

Given,Mixture 1: 75mL water, 30mL 0.05M HC2H3O2 - NaC2H3O2 (buffer, 0.05M of each), 25mL 0.05m KI, 5mL 0.1% starch, 5mL 0.05M NaS2O3, 10mL 1.02M H2O2Initial moles of H2O2 present = concentration x volume= 1.02 M x 0.01 L= 0.0102 moles.

During the reaction between iodide and hydrogen peroxide, iodide ions are oxidized to iodine by H2O2. The iodine formed is then reduced back to iodide by thiosulfate as given below:I₂(aq) + 2S₂O₃²¯(aq) → 2I¯(aq) + S₄O₆²¯(aq).The thiosulfate ion (S₂O₃²¯) reacts with the iodine (I₂) that forms as follows:S₂O₃²¯(aq) + I₂(aq) → S₄O₆²¯(aq) + 2I¯(aq).It means the number of moles of thiosulfate consumed is equal to the number of moles of iodine formed in the reaction.

Since 1 mole of H2O2 reacts with 2 moles of iodide, therefore moles of iodine formed = 2 x moles of H2O2 consumed. By stoichiometry,0.025 moles of Na₂S₂O₃ reacts with 0.0125 moles of I₂. At the end of the reaction, the Na₂S₂O₃ is completely consumed. Hence, the amount of Na₂S₂O₃ used = 0.025 moles. But the reaction will only cease when all the iodine has reacted with thiosulfate ions.0.025 moles of Na₂S₂O₃ can react with 0.0125 moles of I₂. Therefore the amount of I₂ present in the reaction = 0.0125 moles. The initial amount of H2O2 = 0.0102 moles. From the stoichiometry of the reaction,0.0102 moles of H2O2 reacts with 2 x 0.0125 moles of I₂= 0.025 moles of I₂. The number of moles of H2O2 consumed = 0.025/2 = 0.0125 moles. Therefore, percentage of the moles of H2O2 present have been consumed during the timed reaction = (0.0125/0.0102) x 100%= 122.55%.Therefore, 100% of the H2O2 would be consumed when the thiosulfate runs out. As thiosulfate is consumed, the iodine produced can no longer be reduced.

The concentration of I- will continue to decrease as I2 continues to form. When the Na2S2O3 is used up, all the I2 will remain, resulting in the solution changing from a blue color to a deep purple/black color, which means that the iodine is not fully reduced to iodide.

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Answer:

Explanation:

BIG OL BEAN

At constant temperatures, the simplest approach to reduce the volume of a gas is to raise its pressure. So, at 700 bar, or 700 times normal atmospheric pressure, hydrogen has a density of 42 kg/m3, compared to 0.090 kg/m3 at normal pressure and temperature.

Hydrogen decreases metal oxides in the reactivity series below. That is, hydrogen can only decrease the oxides of metals that are less reactive than hydrogen itself.

High-Temperature Water Splitting: Chemical processes that split water to make hydrogen are fueled by high temperatures generated by solar concentrators or nuclear reactors.

The oxidation number of hydrogen gas is 0, but the oxidation state of hydrogen atoms in water is +1. As a result, the hydrogen atom has been oxidized. It acts as a reducing agent.

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CH3 is the empirical formula of a compound that has a carbon to hydrogen ratio 2-6.

What is empirical formula?

The empirical formula of a chemical compound is the simplest and most basic ratio of the constituent elements present in it. It is written as the smallest whole-number ratio of the constituent elements, and does not indicate the amount or concentration of each element.

The empirical formula of a compound is the simplest whole number ratio of atoms in a molecule. In this case, the given carbon to hydrogen ratio of the compound is 2:6, which can be simplified to 1:3. This means that for every one carbon atom, there are three hydrogen atoms in the compound.

6H / 2C × 1/2 / 1/2 → 3 H / 1C

Therefore, the empirical formula of this compound is CH3.

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