A decomposition of hydrogen peroxide into water and oxygen gas is an exothermic reaction. If the temperature is initially 28˚ C, what would you expect to see happen to the final temperature? Explain what is happening in terms of energy of the system and the surroundings.

The last third-party candidate to win one or more states was George Wallace of the American Independent Party in 1968.

Who was George Wallace?

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Please click above answer.

Answer:

litre.50000665432158900643212lo

Answer:

Calcium

Explanation:

It has the largest atom

Answer:

the periodic table

Explanation:

Elements with similar properties are in columns called groups. Elements to the left of this line are metals. Elements in the same group of the periodic table have the same number of electrons in their outer shell. This gives them similar chemical properties.

Hope this helps!

Answer:

Ocean

Explanation:

Answer:

See answer below

Explanation:

I have to answer this question in english because is the rule here. I hope you can understand this.

Now, in order to answer this, is really easy. We already have the quantity of SO₂ in the air of a city. This concentration is 14 mg/m³, so we want to know the quantity in 1 L. This quantity can be expressed in mass.

If concentration according to the units is: mg/m³ This means that we have units of mass and volume. So, in order to know the quantity of SO₂ in mass, we need to convert the units of volume m³ to liter.

1 m³ is covered in 1000 L, therefore:

14 mg/m³ * 1 m³/1000 L = 0.014 mg/L

Then, the mass will be:

m = 0.014 mg/L * 1 L

m = 0.014 mg of SO₂

This is the quantity of SO₂ in 1 L.

The properties which are desirable of a gravimetric analysis precipitate are:

insoluble, easily filterable, pure and small particle size.

Gravimetric analysis precipitates should be insoluble in the solution from which they were generated. This guarantees that the mass of the precipitate can be determined accurately.

The precipitate should be easily filterable, which means it should form a compact, well-defined layer on the filter paper without passing through the filter paper's pores. This allows for the precipitate to be easily separated from the solution and any contaminants.

The precipitate should be pure, which means it should be free of any contaminants that might impair the gravimetric analysis's accuracy. Any contaminants in the precipitate might contribute to an overestimation of the analyte.

Small particle size is preferred because it increases the surface area of the precipitate, allowing for the thorough elimination of any contaminants that may be present. Also, tiny particles settle faster, which might shorten the time required for the gravimetric analysis's precipitation stage.

A colloidal suspension is undesirable because it implies that the particles are too tiny to settle out of the solution and may be difficult to separate during the filtering process. This might result in insufficient precipitation and erroneous data.

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Answer: it's D

Explanation:

Same reason as the dude above me

Food engineering is a rapidly evolving field. Traditionally, the primary emphasis has been on food preservation and stabilization, whereas current trends emphasize diversity, health, taste, and sustainable production.

Best Example is "  Freeze-drying blueberries to extend their shelf life "

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Answer:

A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.

The total ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and are represented as ions.

The net ionic equations shows the equation in which all the species of the reactants and the products are in dissociated form and do not show the spectator ions which are same in the reactants and the products.

a) zinc nitrate + calcium sulphide \(\rightarrow \) zinc sulphide + calcium nitrate

balance equation : \(Zn(NO_3)_2(aq)+CaS(aq)\rightarrow ZnS(s)+Ca(NO_3)_2(aq)\)

total ionic equation :

\(Zn^{2+}(aq)+2NO_3^-(aq)+Ca^{2+}(aq)+S^{2-}(aq)\rightarrow ZnS(s)+Ca^{2+}(aq)+2NO_3^-(aq)\)

net ionic equation :

\(Zn^{2+}(aq)++S^{2-}(aq)\rightarrow ZnS(s)\)

b) potassium + calcium chloride  \(\rightarrow \) potassium chloride + calcium

balance equation : \(2K(s)+CaCl_2(aq)\rightarrow 2KCl(aq)+Ca(s)\)

total ionic equation :

\(2K(s)+Ca^{2+}(aq)+2Cl^-(aq)\rightarrow 2K^+(aq)+2Cl^-(aq)+Ca\)

net ionic equation: \(2K(s)+Ca^{2+}(aq)+\rightarrow 2K^+(aq)++Ca\)

Answer:

14. The protons and neutrons count, but the electrons do not.

Explanation:

After reading the article of Marie Curie on Radium and Polonium the answers to the following queries about radioactivity were given.

a) The amount of uranium in a substance directly correlates with its activity. b) Physical state changes and chemical reactions do not stop the activity. c) A characteristic of matter's atoms is radioactivity. d) About Marie Curie : was born Maria Salomea Skodowska, Polish physicist and chemist Marie Curie carried out ground-breaking studies on radioactivity. She is also naturalized French. She was the first woman to earn the Nobel Prize, the first and only woman to receive the award twice, and the only recipient of the prize in two different scientific categories. Her first Nobel Prize was shared with her husband, Pierre Curie, making them the first married couple in history to share the honor and beginning the Curie family heritage of five Nobel Prizes. At the University of Paris, she was the first woman to hold the position of professor in 1906. In what was then the Kingdom of Poland, a component of the Russian Empire, she was born in Warsaw.

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Gravity is a (n) force between objects and depends on an object's size and their distance apart.

Gravitational force is the attractive that exist between all object with mass an object with mass attracts another object with mass the magnitude of the force is directly proportional to the masses of the two objects and inversely proportional to the square of the distance between the two objects

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1. The correct answer is basic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The barium cation has a +2 charge, so it will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, making the barium cation basic in nature.

2. The correct answer is acidic. Barium cyanide, Ba(CN)2, is an ionic compound composed of a barium cation and a cyanide anion.

When it is dissolved in water, it will dissociate into barium cations and cyanide anions. The cyanide anion has a -1 charge, and will donate a single hydrogen ion to the water, forming the hydronium ion, H3O+, making the cyanide anion acidic in nature.

3. The correct answer is neutral. An aqueous solution of barium cyanide, Ba(CN)2, will be neutral. When the compound is dissolved in water, it will dissociate into barium cations and cyanide anions.

The barium cation will accept two hydrogen ions from the water, forming the barium hydroxide ion, Ba(OH)2, and the cyanide anion will donate one hydrogen ion to the water, forming the hydronium ion, H3O+. These two processes will cancel each other out, resulting in a neutral solution.

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Answer:

an experiment where there is only one variable which means a controlled experiment is something tht is watched constantly and dosent change

Explanation:

Answer:

An experiment where there is only one variable.

Explanation:

There is only one variable in the experiment.

The given statement "A change in the concentration of the reactant or the product do not change keq" will be false. Because a change in the concentration of a reactant or product will change the value of Keq.

According to Le Chatelier's principle, when a stress is applied to a system at equilibrium, the system will respond in a way that partially counteracts the stress and reestablishes equilibrium. Changes in the concentration of a reactant or product will alter the concentrations of all species present in the reaction, and thus will disturb the equilibrium.

For example, if the concentration of a reactant is increased, the reaction will shift towards the product side to partially counteract the increase in the concentration of the reactant. This will result in an increase in the concentration of products and a decrease in the concentration of reactants. As a result, the value of Keq will change to reflect the new equilibrium concentrations of reactants and products.

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A 1.60 g tablet is found to contain 0.0133 mol of the amino acid glycine (C₂H₅NO₂). (The molar mass of C₂H₅NO₂ is 75.07 g/mol.). So the mass percent of C₂H₅NO₂ in the tablet is 62.4%.

To find the mass percent, one needs to first determine the mass of C₂H₅NO₂ in the tablet. One can do this using the molar mass of C₂H₅NO₂, which is given as 75.07 g/mol in the question.

The molar mass of C₂H₅NO₂ is 75.07 g/mol, so the mass of 0.0133 mol of C₂H₅NO₂ is:

0.0133 mol x 75.07 g/mol = 0.998 g

Therefore, the mass percent of C₂H₅NO₂ in the tablet is:

(0.998 g / 1.60 g) x 100% = 62.4%

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Explanation:

To solve this question, we need to use the Hess's Law.

Hess's Law states that: in a chemical reaction, the heat released or absorbed is constant and independent of the number of steps the reaction goes through. That is, the law states that the enthalpy change of a chemical reaction depends only on its initial state and its final state.

Hess's Law is also known as the law of the sum of heats of reaction, because the enthalpy change is equal to the sum of the changes in the steps through which the chemical reaction passes (intermediate reactions). The calculation is performed as follows:

- If the chemical reaction is inverted, the sign of the enthalpy change must also be inverted;

- If the equation is multiplied, the enthalpy change must also be multiplied;

- If dividing the equation, the enthalpy change must also be divided.

So we're going to invert, divide, or multiply each given equation in order to get the equation that the question gives us.

The equation the question gives us is:

4Al(s) + 3MnO2(s) --> 2Al2O3 (s) + 3Mn(s)

Let's multiply the first equation by 2:

4 Al + 3 O2 --> 2 Al2O3

ΔH = -1676 * 2 = -3,352 kJ

Let's invert and multiply by 3 the second equation:

3 MnO2 -> 3 Mn + 3O2

ΔH = -521 * 3 * (-1)

ΔH = 1,563 kJ

Answer: -1,789 kJ

Answer: 25%

Explanation: To find the mass percentage of a chemical you need to do mass/total mass x 100 = %.

In this case you would do 5.0/20.00 because 5.0 is the mass of the hydrogen and 20.00 is the total mass. That equals .25 so the next step is to times that by 100.

.25 x 100 = 25, so we know that the percent of the hydrogen mass in compound 1 = 25%

Does anyone know compound 2?? I’m stuck I don’t know how to do this

Answer: The hydrosphere includes all of the water which is on the surface of the planet. A planet's hydrosphere can be vapor, ice, or liquid.

Answer:

hydrosphere

Explanation:

A solution with a hydrogen ion concentration of 3.25 × 10^-5 M is acidic and has a hydroxide ion concentration of 3.08 × 10^-10 M.

To determine this, we follow these steps:

1. Identify that a higher hydrogen ion concentration indicates acidity. Since the given concentration is greater than 10^-7 M (neutral), the solution is acidic.

2. Use the ion product of water (Kw) formula to find the hydroxide ion concentration. Kw = [H+] × [OH-], where Kw is 1.0 × 10^-14 at 25°C.

3. Substitute the given hydrogen ion concentration and solve for the hydroxide ion concentration:
(3.25 × 10^-5 M) × [OH-] = 1.0 × 10^-14
[OH-] = (1.0 × 10^-14) / (3.25 × 10^-5 M)
[OH-] ≈ 3.08 × 10^-10 M

So, the correct answer is B) acidic, 3.08 × 10^-10 M.

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Answer:

oxygen

Explanation:

Color can be used to determine the mass percent of copper in brass through a technique called colorimetry.

Colorimetry relies on the fact that different elements or compounds absorb and reflect light differently, leading to variations in color. Copper has a distinct reddish-brown color, while zinc has a bluish-white color. By measuring the intensity of light absorbed or transmitted by a brass sample, it is possible to estimate the copper content.

One approach is to prepare a set of brass samples with known mass percentages of copper. Each sample will exhibit a different color due to the varying copper content. A colorimeter or spectrophotometer can then be used to measure the absorbance or transmittance of light through each sample at a specific wavelength. The resulting data can be used to create a calibration curve relating color intensity to the mass percent of copper.

Next, the color of an unknown brass sample can be measured using the same instrument and wavelength. By comparing the color intensity of the unknown sample to the calibration curve, the corresponding mass percent of copper can be determined.

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Answer: the reactions shifts to the right (products) to produce fewer moles of gas

Explanation:

acellus confirmed

The equilibrium will shift to the right, favoring the formation of more SO₃(g) to reduce the pressure.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in temperature, pressure, or concentration of reactants/products, the system will adjust itself to counteract the change and reestablish equilibrium.

In the given reaction, the total number of moles of gas on the left side (2 moles of SO₂ and 1 mole of O₂) is greater than the total number of moles of gas on the right side (2 moles of SO₃). When the container is shrunk to 2.5 L, the volume is reduced, resulting in an increase in pressure.

To counteract the increase in pressure, the equilibrium will shift to the side with fewer moles of gas. In this case, the equilibrium will shift to the right (forward direction), favoring the formation of more SO₃(g). By producing more SO₃, the system effectively reduces the number of moles of gas, thereby decreasing the pressure to reestablish equilibrium.

This shift to the right will increase the concentration of SO₃(g) and decrease the concentrations of SO₂(g) and O₂(g) until a new equilibrium is reached in the smaller 2.5 L container. As a result of this change, more SO₃(g) will be produced, and the reaction will release more heat (198 kJ) to maintain the new equilibrium state.

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Answer:

it is because of the bacteria and different things that go into waters such as ponds, rivers, lakes, seas, oceans, streams, and other body of waters and I should also add the chemicals that go into them as well

Explanation:

Activation energy is the minimum amount of energy required for a chemical reaction to occur. Lowering the activation energy effectively speeds up the reaction by making it easier for reactant molecules to overcome the energy barrier and proceed to the product formation.

1) Ferric Ions:

When ferric ions (Fe3+) lower the activation energy from 18 to 13 kcal/mol, it means that the presence of these ions facilitates the reaction by providing an alternative pathway with a lower energy barrier. The reaction can proceed more readily in the presence of ferric ions because they interact with the reactants or intermediates in a way that stabilizes them or helps them adopt a more favorable configuration. By reducing the activation energy from 18 to 13 kcal/mol, the ferric ions effectively make it easier for the reactant molecules to reach the transition state and undergo the reaction, resulting in an overall faster rate of the chemical reaction.

2) Catalase:

Catalase is an enzyme that catalyzes the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2). When catalase lowers the activation energy from 18 to 7 kcal/mol, it signifies that the enzyme significantly accelerates the reaction by providing an alternative reaction pathway that has an even lower energy barrier. Catalase achieves this by binding to the reactant molecules (H2O2) in a specific orientation, which facilitates the breaking of chemical bonds and the formation of product molecules (H2O and O2). The lower activation energy of 7 kcal/mol, compared to the original 18 kcal/mol, means that catalase provides a highly efficient pathway for the reaction, resulting in a substantially faster rate of hydrogen peroxide decomposition.

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The amount of aluminum that reacted is approximately 0.069 grams.

To determine the mass of aluminum that reacted, we need to use the ideal gas law and consider the partial pressure of hydrogen gas. First, we calculate the pressure of hydrogen gas by subtracting the partial pressure of water vapor from the total pressure. The pressure of hydrogen gas is 751 mmHg - 26.8 mmHg = 724.2 mmHg.

Next, we convert the pressure of hydrogen gas from mmHg to atm by dividing by 760 mmHg/atm, giving us 0.953 atm.

Using the ideal gas law equation PV = nRT, we can calculate the number of moles of hydrogen gas. The volume of hydrogen gas is given as 37.3 mL, which we convert to liters by dividing by 1000 mL/L, giving us 0.0373 L. The temperature is given as 27°C, which we convert to Kelvin by adding 273.15, giving us 300.15 K. The ideal gas constant R is 0.0821 L∙atm/(mol∙K).

Plugging the values into the ideal gas law equation, we can solve for the number of moles of hydrogen gas: (0.953 atm) * (0.0373 L) = n * (0.0821 L∙atm/(mol∙K)) * (300.15 K).

Simplifying the equation, we find that the number of moles of hydrogen gas is approximately 0.00139 moles.

Since the balanced chemical equation between aluminum and hydrochloric acid is 2Al + 6HCl → 2AlCl₃ + 3H₂, we can conclude that 2 moles of aluminum react to produce 3 moles of hydrogen gas.

Using this ratio, we can calculate the number of moles of aluminum that reacted: (0.00139 mol H₂) * (2 mol Al / 3 mol H₂) = 0.000926 moles Al.

Finally, we can convert moles of aluminum to grams using the molar mass of aluminum (26.98 g/mol): (0.000926 mol Al) * (26.98 g/mol) ≈ 0.069 g Al.

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Answer:299,800,000

Explain: The speed of light is 3.00x108m/s and in mph is 6.708 x 108.

0.88L solution are needed to make a 2.5 m solution containing 2.2 moles of NaOH

Since we are given the concentration of the solution expressed in molarity and the volume of solution,

we can use the equation for molarity defined as the number of moles of solute divided by the volume of the solution in liters:

    molarity = moles of solute / volume of solution in liters

We rearrange the expression to solve for the number of moles of the solute:

    2.2= 2.5 M × volume of solution in liters

Substituting the given values, we have

   volume of the solution in litres = 2.2 moles/2.5 M = 0.88 L

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