Which chemical or physical change is an exothermic process? the baking of cookies the combustion of gasoline the evaporation of water from a pool the cold pack reaction mc001-1. Jpg.

Answer:

5.72 g ( 1 mol / 180.16 g ) (  6.022 x 10^23 molecules / mole ) = 1.90x10^23 molecules

Answer:

Electrically neutral atoms simply possess the same number of electrons as protons.

Explanation:

This gives the objects a balance of both type of charge. There are 11 electrons and 10 protons.

The statement is True. Electrically neutral atoms have an equal number of electrons and protons, balancing out the atomic charges and making the atom neutral.

The statement 'Electrically neutral atoms have equal numbers of electrons and protons' is True. In an electrically neutral atom, the number of protons in the nucleus is exactly balanced by the number of electrons surrounding the nucleus. This is due to the fact that the proton has a positive charge, and the electron has an equivalent but negative charge. So, when the number of protons equals the number of electrons, these charges cancel each other out and the atom as a whole is neutral.

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Answer:

Pppppppp pppppppp pppppppp pppppppp

Answer:

1 A true

B False

C not sure about it False

D False

Answer:

Do you think that the mole should be considered a base unit in the SI system?

The mole is not a base unit on a par with the six property base units; it cannot be used in significant physical–chemical comparisons until the subscript parameter p in mole-of-Ep has been given a certain “value”."

Explanation:

The Ka of this weak acid is approximately 1.44 x 10^(-11) and the concentration at equilibrium is approximately 1.42 x 10^(-6) M.

A) To find the concentration of H+ (in M) at equilibrium, you need to use the pH formula:

pH = -log[H+]

First, you are given the pH of the solution: 5.85. To find the concentration of H+ ions, use the formula:

[H+] = 10^(-pH)

[H+] = 10^(-5.85)

[H+] ≈ 1.42 x 10^(-6) M

The concentration of H+ ions at equilibrium is approximately 1.42 x 10^(-6) M.

B) To find the Ka of this weak acid, you need to use the equilibrium expression for the weak acid ionization:

Ka = [H+][A-] / [HA]

You are given the initial concentration of the weak acid, 0.140 M, and the concentration of H+ ions at equilibrium, 1.42 x 10^(-6) M. Assuming that the weak acid ionizes according to the following reaction:

HA ⇌ H+ + A-

At equilibrium, [H+] = [A-] and [HA] = (0.140 - [H+]). Now, plug these values into the Ka expression:

Ka = (1.42 x 10^(-6))(1.42 x 10^(-6)) / (0.140 - 1.42 x 10^(-6))

Ka ≈ 1.44 x 10^(-11)

The Ka of this weak acid is approximately 1.44 x 10^(-11).

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Anion radius; \(r_{a}\) = 0.351 nm

We are given;

Force of attraction: \(F_{A}\) = 6.02 × 10⁻⁹ N

Radius of cation; \(r_{c}\) = 0.04 nm = 4 × 10⁻¹¹ m

Formula for the force of attraction is given by;

\(F_{A}\) = \(\frac{1}{4\pi \epsilon_{0} }\) × \(\frac{|Z_{1}|*|Z_{2}|*e^{2}}{r^{2}}\)

where;

ε₀ is a constant = 8.85 10⁻¹² N/m

Z₁ is charge on divalent cation = 2

Z₂ is charge on anion = -2

e is charge on an electron = 1.6 × 10⁻¹⁹ C

r = \(r_{a}\) + \(r_{c}\)

where, \(r_{a}\) is radius of anion

Thus;

r = = \(r_{a}\) + (4 × 10⁻¹¹) m

Plugging in the relevant values, we have;

6.02 × 10⁻⁹ = \(\frac{1}{4\pi * 8.85 * 10^{-12} }\) × \(\frac{2 * 2 * (1.6 * 10^{-19})^{2} }{(r_{a} + (4 * 10^{-11})){2} }\)

Simplifying this gives;

\(r_{a}\) = 3.51 × 10⁻¹⁰ m = 0.351 nm

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Answer:

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Lithium carbonate contains 18.78% mass percent lithium. It should be noted that a compound's overall percentage composition of all its constituent elements is always 100%.

Only depression related to bipolar illness is authorized for lithium use. When combined with an antidepressant, it may also be successful in alleviating other types of depression, although further research is required. Discuss the possibility of adding lithium with your doctor if you are on an antidepressant but are still experiencing symptoms.

This substance is employed for the treatment of mania and depression (bipolar disorder). By bringing certain natural compounds back into equilibrium in the brain, it helps to calm mood and lessen excessive behavior.

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The balanced chemical equation for the reaction of dinitrogen tetraoxide (N2O4) converting to nitrogen dioxide (NO2) is:

N2O4(g) ⟶ 2NO2(g)

According to the stoichiometry of the reaction, for every 1 mole of N2O4 reacted, it forms 2 moles of NO2. Therefore, if the number of moles of dinitrogen tetraoxide is known, we can calculate the moles of nitrogen dioxide formed.

Let's assume the number of moles of dinitrogen tetraoxide is represented by 'x'. According to the stoichiometry, the number of moles of nitrogen dioxide formed would be 2x.

So, if the number of moles of dinitrogen tetraoxide from the previous question was reacted completely, the number of moles of nitrogen dioxide formed would be 2 times the number of moles of dinitrogen tetraoxide.

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The chemical properties could be obtained by adding acid to the plastic to see if it reacts.

Chemical properties are those properties that could only be observe when a substance undergoes chemical change. In this case, a chemical change could also be called a chemical reaction.

A substance could be said to undergo a chemical reaction  if there is a rearrangement of the atoms of the compound. This would ultimately lead to the formation of a new substance.

Now the forensic scientist wants to know the chemical properties of the plastic. This could be done by reacting the plastic with acid.

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Answer:

The short answer is (C)  Add acid to the plastic to see if it reacts

Explanation:

Got it right on my quiz.

The refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

To calculate the kilowatt-hours (kWh) of electric energy used by the refrigerator in 30 days, we need to multiply the power rating by the total running time.

Given:

Power rating of the refrigerator = 500 W

Running time per day = 12 hours

Number of days = 30

First, we need to convert the power rating from watts to kilowatts:

Power rating = 500 W / 1000 = 0.5 kW

Next, we calculate the total energy used in kilowatt-hours (kWh) over the 30-day period:

Energy used = Power rating × Running time × Number of days

Energy used = 0.5 kW × 12 hours/day × 30 days

Energy used = 180 kWh

Therefore, the refrigerator would use 180 kilowatt-hours (kWh) of electric energy over the course of 30 days, assuming it runs for 12 hours each day.

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Answer:

The answer is Radiation

Answer:

Convectional

Explanation:

It is the movement of heat through fluid

While radiation travels though a vacuum and conduction accrues between atoms / solids

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Answer:

Convection currents are a circular current caused by the difference in temperatures from the bottom to the top of the mantle. It is because of these currents that the plates of the Earth have moved in the past and are moving today. These plate movements cause earthquakes, mountain building, and volcanism.

Explanation:

Answer:

Na+ 11, 23, 11, 10 , 12, +1

Be 4, 9, 2, 2 , 4 , 0

Cl- 17, 35, 17, 17, 18, -1

It is equal to the total mass of carbon dioxide and water used" as the substrates (CO2 and H2O) are just merely converted to the products (C6H12O6 and O2) with no mass being consumed or used as fuel for the reaction. In this reaction, energy is well conserved. The correct option is B

Photosynthesis can be defined as the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.

Therefore the primary function of photosynthesis is to convert solar energy into chemical energy and then store that chemical energy for future use.

The balanced equation of photosynthesis is: 6CO2 + 6H2O + light energy = C6H12O6 + 6O2.

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The type of chemical reaction that typically forms peptide bonds between amino acids to create a protein is a condensation or dehydration synthesis reaction.

The atoms involved in the formation of a peptide bond are carbon, hydrogen, oxygen, and nitrogen. These atoms combine to create a peptide bond, which links the carboxyl group (-COOH) of one amino acid with the amino group (-NH₂) of another amino acid.
A triglyceride molecule is generally non-polar because it consists of three fatty acid chains attached to a glycerol molecule, and both fatty acids and glycerol are hydrophobic (non-polar) in nature.
Triglycerides are insoluble in water due to their non-polar nature. They do not form hydrogen bonds with water molecules, making them hydrophobic.
Triglycerides store a significant amount of energy. They are the primary storage form of energy in adipose tissue, providing high-energy density due to the long carbon chains in fatty acids.
The energy stored in a triglyceride molecule is higher compared to an amino acid or glucose molecule. Triglycerides have more carbon-hydrogen bonds, which store a higher amount of energy per unit mass than the shorter carbon chains in amino acids or glucose molecules. This is why triglycerides are an efficient energy storage molecule in organisms, as they can be broken down through hydrolysis to release energy when needed.

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The chemist can conclude that the liquid is gaining heat or experiencing an increase in thermal energy.

Thermal energy in chemistry is the energy transferred from one object to another due to a temperature difference. This type of energy is also known as heat energy and is associated with the motion of molecules within an object. At the molecular level, thermal energy can be seen as the kinetic energy of the molecules which are constantly in motion. When two objects with different temperatures come into contact, heat energy is transferred from the object with the higher temperature to the object with the lower temperature. This process continues until both objects reach thermal equilibrium, meaning that the temperatures of both objects are equal. Thermal energy can also be created by the friction between two objects, or by the combustion of a fuel.

From this observation, the chemist can conclude that the liquid in the vat is undergoing a chemical reaction. To determine the exact nature of the reaction, further analysis would be needed. This could include measuring the rate of temperature increase, the products of the reaction, and the reaction enthalpy.

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Explanation:

\(v = vdm \times n\)

Vdm=22.4dm.

mole(n)=4 mol

therefore the total volume

\(v = 22.4 \times 4 \\ v = 89.6dm\)

These facts serve as the best examples of how the tissues, organs, and organ systems in all living things collaborate to maintain homeostasis because contractile vacuoles are organelles that regulate water balance

Homeostasis is the term used to describe the body's need to achieve and preserve a specific state of equilibrium. A physiologist by the name of Walter Cannon first used the term in 1926. The tendency of the body to keep internal conditions, like blood sugar and temperature, at essentially constant and stable levels is known as homeostasis.

Between cells and an entire organ, there is a biological organisational level called tissue. An assembly of comparable cells and their extracellular matrix from the same origin that work together to perform a particular function is referred to as a tissue.

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Answer:

engage in conversation.

Explanation:

Answer:  the process of changing or causing something to change from one form to another.

Explanation:

Answer:

A) H₂O at 120°C

Explanation:

It is possible to think the higher temperature, the greatest degree of disorder. That is because with a high temperature, vibrations of molecules increases.

In general, at low temperatures, the molecules are in solid state (The lowest degree of disorder), increasing its temperature, molecules becomes in liquids, and, with more temperature, are gases (The greatest degree of disorder).

Thus, the sample that has the greatest degree of disorder is:

Answer:

A) H2O(g) at 120c

Explanation:

Castle learning

Answer:

they are all mixed uniformly and have an even composition throughout, substances must combine in specific proportions

Explanation:

-only homogenous mixtures are uniformly mixed

-mixtures comprise of 2 of more substances mixed in any proportion.

-mixtures have the same properties as their constituent elements

-mixtures are separated by physical processes

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Explanation:

In the fermentation of sugar to make ethanol and CO2, 1 mole of glucose (C6H12O6) reacts with 6 moles of oxygen to produce 6 moles of CO2 and 2 moles of ethanol (C2H5OH).

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Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.