5
When energy changes from one form to another, some energy is always changed to

Answer:

1.4 mol

Explanation:

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Explanation:

To write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels, we need to first understand what they are .

Molecular chemical equation: A molecular equation is a chemical reaction equation where the reactants and products are expressed as molecules and the charges aren't shown. A molecular equation can show the reactants and products as solids, liquids, or gases with their states written in parenthesis after each molecule.

Net ionic chemical equation: The chemical equation in which all the spectator ions are removed is known as the net ionic chemical equation. The net ionic equation represents the actual chemical change taking place in the reaction. It demonstrates the substances and ions that actually take part in the chemical change.

Here is an example of how to write the balanced complete molecular chemical equation and the balanced net ionic chemical equation, including phase labels:

Example: Sodium chloride reacts with silver nitrate to form silver chloride and sodium nitrate.

Complete Molecular Chemical Equation:

NaCl(aq) + AgNO3(aq) → AgCl(s) + NaNO3(aq)

Balanced Net Ionic Chemical Equation:

Ag+(aq) + Cl-(aq) → AgCl(s) + Na+(aq) + NO3-(aq)

The phase labels used in the above equations are:aq: aqueous phase (dissolved in water)s: solid phase (precipitate)

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The amount of sulfur emitted by a smokestack before and after the scrubber is attached.

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To determine the solubility of oxygen gas in water when the oxygen pressure is adjusted to 991.2 torr, we can use Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

Now, we can use the adjusted partial pressure (P₂ = 991.2 torr) and the calculated constant (k) to determine the new solubility (S₂)Therefore, the solubility of oxygen gas in water, when the oxygen pressure is adjusted to 991.2 torr, is approximately 0.0730 g/L.To calculate the solubility of oxygen gas in water when the oxygen pressure is adjusted to 991.2 torr, we can use Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas.

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Answer:

As molecules move more quickly, temperature increases.

Explanation:

Kinetic energy can be defined as an energy possessed by an object or body due to its motion.

Any material or object that allow the conduction (transfer) of electric charge or thermal energy is generally referred to as a conductor. Some examples of a conductor are metals, copper, aluminum, graphite, etc.

In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.

Hence, the relationship between temperature and kinetic energy is that as molecules move more quickly, temperature increases due to the absorption of heat.

The standard free-energy change for the reaction at 25°C is 92640 KJ.

The change in free energy that happens when a compound is created from its constituent parts in their most thermodynamically stable states under standard-state circumstances is known as the standard-state free energy of creation.

There are 6 electrons transferred. The anode half-reaction produces 6 electrons while the cathode half-reaction uses 6 electrons.

For these types of reactions always write out the half-reactions and the appropriate oxidation numbers.

6 electrons are transferred as Au³+ has an oxidation number of 3+ and Au has an oxidation number of 0. 3 electrons are gained for each Au³+ and there are 2 Au³+ in the equation

                         \(2Au^3 (aq) +3cr(s)\) ↽−−⇀ \(2Au(s) +3Cr^2\)

Same for Cr to Cr2+ because there are 3 moles of it.

So, n = 6.

     F = 96500 J/(V*mol)

     where  F is faraday's constant.

                 n = moles of electrons are transferred in this reaction.

Standard emf of the cell, E = cathode - anode.

                                             = 1.49 - 1.33

                                             = 0.16

Using the equation,

                                   ΔG = -nFE

                                         = 6 × 96500 × 0.16

                                         = 92640 KJ

Therefore, the standard free-energy change for the reaction at 25°C is 92640 KJ.

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The conjugate base of an acid can be formed by removing a proton (H+) from the acid molecule. The formula for the conjugate base of an acid is determined by the acid's molecular formula.

For example, the conjugate base of hydrochloric acid (HCl) is chloride ion (Cl-), which can be represented by the formula Cl-. The conjugate base of acetic acid (CH3COOH) is acetate ion (CH3COO-), which can be represented by the formula CH3COO-. Similarly, the conjugate base of sulfuric acid (H2SO4) is sulfate ion (SO42-), which can be represented by the formula SO42-. In general, the formula for the conjugate base of an acid is the acid's formula with the loss of a proton (H+).

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By adding a substance known as a catalyst—which is not consumed throughout the reaction and can be recovered in its original form at its conclusion—to a chemical reaction, a method known as catalysis is used to speed up the rate of the reaction.

Catalysts are compounds that can be included in a reaction to speed up the process without being consumed. They often function by reducing the energy of the transition state, which lowers the activation energy, or by altering the reaction's mechanism. The transition state's nature (and energy) are both altered as a result.

There are catalysts everywhere! Enzymes, which are proteins that function as catalysts, are crucial for many metabolic reactions, including the oxidation of glucose.

Acid-base catalysts and heterogeneous (or surface) catalysts are two more popular categories of catalysts.

Example: Anhydrase carbonic

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This reaction is exothermic is the chemical reaction of \(C_4H_8\)+ \(O_2\)--- \(CO_2\)+ \(H_20.\)

Exothermic reactions in chemistry refer to chemical reactions that release energy in the form of heat, light, or sound. During an exothermic reaction, the reactants have a higher energy level than the products, resulting in the release of excess energy in the form of heat, light, or sound. The opposite of an exothermic reaction is an endothermic reaction, in which energy is absorbed from the surroundings.

One common example of an exothermic reaction is combustion, in which a fuel reacts with oxygen to produce heat and light. Another example is the reaction between an acid and a base, which results in the release of heat and the formation of a salt and water. Exothermic reactions play an important role in many biological and chemical processes, including metabolism, respiration, and the production of energy.

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Sodium (Na) and chlorine (Cl) are two highly reactive elements that, when chemically bonded, form the compound sodium chloride (NaCl), more commonly known as table salt.

What is surprising about the properties of these elements when they chemically bond to form this compound is that the resulting compound is a very stable and highly crystalline solid that is not reactive or explosive like the individual elements.

Sodium, when exposed to air or moisture, reacts vigorously and can ignite or explode. Chlorine, being a halogen, is a highly reactive gas and can be toxic to living organisms. However, when they bond together, they form a stable compound that is safe to handle and consume.

Therefore, Another surprising property of this compound is that it is an ionic compound, meaning it is composed of ions with a positive charge (Na+) and negative charge (Cl-). This type of chemical bond is formed by the transfer of electrons from one atom to another, which makes it an ionic bond, different from covalent bond that is formed by the sharing of electrons.

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The correct statement is a. At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.

The ideal gas law assumes that gas particles have no volume and do not interact with each other, which is not completely true for real gases. At low temperatures, the gas particles move more slowly and are closer together, making intermolecular forces, such as van der Waals forces, more significant. These forces cause the gas particles to attract each other, reducing the effective number of particles and lowering the pressure. Statements b, c, and d are false. At a given temperature, lighter gas particles travel faster than heavier particles, not more slowly (statement b). The average kinetic energy of a gas sample increases with temperature, not decreases (statement c). At high pressures, the volume of individual gas particles becomes significant and cannot be neglected (statement d).

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The activation energy of a reaction is the minimum amount of energy required to start it. In this case, 54.0 kJ/mol is required for the reaction to start. As the temperature is increased, the rate constant increases.

Temperature is a measure of the degree of hotness or coldness of an object or environment. It is measured on a numerical scale, with a higher number indicating a higher temperature and a lower number indicating a lower temperature. Temperature is an important physical property of matter, and it is related to the amount of energy an object or environment possesses. Temperature can be measured using a variety of tools, such as thermometers, infrared sensors, or thermocouples.

Thus, for a rate constant to increase by a factor of 7.00, the temperature must have been increased by some amount.

To calculate the higher temperature, we can use the Arrhenius equation:

\(k = Ae^{(-Ea/RT)\)

Where k is the rate constant, A is the pre-exponential factor, Ea is the activation energy, R is the gas constant, and T is the temperature.

Rearranging the equation to solve for T:

T = -Ea/ln(k/A)

Plugging in the values given, we get:

T = -54.0/(ln(7.00)/A)

Since A is unknown, we can't solve for the higher temperature.

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Answer:

1) all matter is made up of atoms and molecules 2) these tiny particles are always in motion; the higher the temp. the faster they move 3) at the same temp., heavier particles move more slowly then small particles

Explanation:

Answer:

Li

Explanation:

F is a strongest electronegative element and it will combine with an element with low electronegativity. From the list provided, the element is Li.

To prepare 2.40 L of 0.500 M NaOH solution from an 8.25 M NaOH solution, you need to determine the volume of the concentrated solution required.

You can use the dilution equation:
M1 × V1 = M2 × V2
where M1 is the initial molarity, V1 is the initial volume, M2 is the final molarity, and V2 is the final volume.
Here, M1 = 8.25 M, M2 = 0.500 M, and V2 = 2.40 L. You need to solve for V1:
8.25 M × V1 = 0.500 M × 2.40 L

Rearrange the equation to find V1:
V1 = (0.500 M × 2.40 L) / 8.25 M
V1 = 1.20 L / 8.25
V1 ≈ 0.145 L or 145 mL

So, to prepare 2.40 L of 0.500 M NaOH solution, you must dilute 145 mL of 8.25 M NaOH solution.

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Answer:

La configuración de estado fundamental del oro es [Xe]5d106s1 La diferencia de nivel de energía entre el 6s y el 5d es pequeña. Esto hace posible que uno de los dos electrones 6s esté en los orbitales 5d.

Explanation:

Answer:

B.

Solution given:

specific heat capacity of water [c]4.186 J/g °C

temperature[∆T]=?

mass[m]=3g

heat[Q]=8000J

we have

Q=mc∆T

8000=3*4.186*∆T

∆T=8000/12.558

∆T=637.04°C.

the temperature change is 637.04°C.

Answer:

Big dipper

Explanation:

Answer:

6078

Explanation:

The petal of rose has different kinds of pigments like anthocyanins, carotenoids which give them the colors.

What are Anthocyanins?

Anthocyanins are the pigment that produces red color in the roses. They belong to Flavonoids family.

The pigments in a rose's petals give it its color. These pigments mostly consist of carotenoids and anthocyanins. Bright yellow, orange, and red pigments like those in lemons, oranges, and tomatoes are made by carotenoids. They are contained in structures called plastids, which are a component of the cytoplasm of plant cells. They are therefore steady and largely unaffected by the environment or the health of the plant. Deep red, magenta, purple, and blue colors are made of anthocyanins. They are transported via the sap of the plant and are water soluble. They are far less stable and more susceptible to external variables because they are in a fluid environment.

According to research, a bloom's anthocyanin content and sap pH fluctuate as a flower develops from a bud to a bloom. The pH of the sap increases with bloom aging and anthocyanin content decreases. As those who grow hydrangeas are aware, more acidic conditions prefer the pink/red end of the color spectrum while high alkaline levels produce blue colorations. As a result, as your rose bloom ages and its pH rises, the red will tend to lean toward the darker, bluer side of the spectrum. When a flower is in bloom, anthocyanin levels are still high, but they start to drop off swiftly as the blossom fades.

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Answer:

Conduction

Explanation:

Conduction can be regarded as transfer of thermal energy which exist

between two or more objects that are in contact with each other. From the question, the spoon touches the hot liquid and heat is transferred to the spoon through conduction

Molar mass is the mass of one mole of a substance. Therefore, the molar mass of trans-9-(2-phenylmethyl)anthracene is 356.44 g/mol.

The substance in question is trans-9-(2-phenylethenyl)anthracene. This organic compound can be represented as C28H20. The molar mass of trans-9-(2-phenylethenyl)anthracene is therefore calculated as follows:Step 1Determine the molar mass of carbon (C) and hydrogen (H). The atomic mass of carbon is 12.01 g/mol, and the atomic mass of hydrogen is 1.008 g/mol. Step 2Calculate the total molar mass of carbon and hydrogen in the compound. Multiply the atomic mass of carbon by the number of carbon atoms in the compound (28), and multiply the atomic mass of hydrogen by the number of hydrogen atoms in the compound (20).Step 3Add the molar masses of carbon and hydrogen to get the total molar mass of the compound. 12.01 × 28 + 1.008 × 20 = 336.28 + 20.16 = 356.44 g/molTherefore, the molar mass of trans-9-(2-phenylethenyl)anthracene is 356.44 g/mol.

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Answer:

Normal boiling point is the temperature at which a liquid boils at 1 atmosphere of pressure.

Explanation:

Reactions tend to run to completion if a product precipitated as a solid. Option B is correct.

When one of the products is taken out of the reaction mixture, reactions frequently proceed to completion. If a product is precipitated as a solid, it is no longer in the reaction mixture and is effectively removed from the system. This drives the reaction to completion in order to produce more of the solid product.

On the other hand, the physical state of a product (high melting point, liquid, or ionic) does not necessarily affect the extent to which a reaction runs to completion. While a high melting point may make it difficult to remove the product from the reaction mixture, it does not necessarily prevent the reaction from reaching completion.

Hence, B.is the correct option.

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Answer:

0.1 M

Explanation:

(25 mL) (0.20 M) / 50 mL = 0.1 M

J.J. Thomson established the plum pudding model of an atom and discovered the electron as a result of his cathode ray tube research.

The electric discharge of a cathode ray tube was extensively researched by scientists. The crucial part was Thomson's interpretation. He interpreted the rays' deflection by the charged plates and magnets as proof of "things far smaller than atoms." Thomson determined that these bodies had a high charge-to-mass ratio and calculated the charge's actual value.

A concept of the atom as a sphere of positively charged matter with electrons positioned according to electrostatic forces was put forth by Thomson in 1904 which is now known as the plum pudding model. He not only found the electron but also concluded that it was a crucial component of an atom.

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Answer:

⇌ means that the equation is reversible, The reactants can become products and vice versa

Explanation:

Answer:

See below ~

Explanation:

The reaction :

The double sided arrow represents that this is a reversible reaction.

Just as calcium carbonate can dissociate into calcium ion and carbonate ion, it can form calcium carbonate when calcium ion and carbonate ion are bonded together ionically.

The volume of the dry gas at 763 torr and 15 °C, given that 247 mL of the gas was collected over water is 228 mL

First, we shall list out the given parameters from the question. Details below:

We can obtain the volume of the dry gas by using Boyle's law equation as shown below:

P₁V₁ = P₂V₂

705.2 × 247 = 763 × V₂

174184.4 = 763 × V₂

Divide both side by 763

V₂ = 174184.4 / 763

V₂ = 228 mL

Thus, from the above calculation, the volume on the dry gas is 228 mL

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