Light energy constitutes minute packets discrete from one another called?

Answer:

8

Explanation:

Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus

Answer:

which question is it for

Covalent bonds consist of pairs of electrons shared by two atoms, and bind the atoms in a fixed orientation.

Answer:

d i took the test

Explanation:

Answer:

47

Ag

Silver

107.87

Explanation:

Answer:

\(\boxed {\boxed {\sf 81.4 \ g\ KOH}}\)

Explanation:

We are asked to convert 1.45 moles of potassium hydroxide (KOH)  to grams.

The molar mass is the mass in grams of 1 mole of a substance. The values are found on the Periodic Table. They are the same as the atomic masses but the units are grams per mole (g/mol) instead of atomic mass units (amu).

We have the compound KOH. Look up the molar masses of the individual elements.

The formula for the compound has no subscripts, so there is 1 mole of each element in 1 mole of the compound. We can simply add the molar masses.

Based on the molar mass, there are 56.105 grams of KOH in 1 mole. Create a ratio using this information.

\(\frac {56.105 \ g\ KOH}{ 1 \ mol \ KOH}\)

We are converting 1.45 moles of KOH to grams, so we multiply by this value.

\(1.45 \ mol \ KOH *\frac {56.105 \ g\ KOH}{ 1 \ mol \ KOH}\)

The units of moles of KOH cancel.

\(1.45\ *\frac {56.105 \ g\ KOH}{ 1 }\)

\(81.35225 \ g\ KOH\)

The original measurement of moles has 3 significant figures, so our answer must have the same.

For the number we calculated, that is the tenths place. The 5 in the hundredths place (81.35225) tells us to round the 3 up to a 4.

\(81.4 \ g\ KOH\)

Approximately 81.4 grams of potassium hydroxide are represented by 1.45 moles.

11.5 g of glucose is initially put into the volumetric flask.

After that, 1000 adds water.

At this time, the solution's concentration is (11.5/100) = 0.115 g/mL.

This glucose solution was diluted to 0.500 L from a sample of 60.0 mL.

The already-mixed solution is then diluted to a volume of 0.500 L from 60.0 mL.

The mass of glucose is then provided in 60.0 mL of the mixed solution with a concentration of 0.115 g/mL.

Volume = 0.115 60 = 6.9 g when mass is (conc in g/mL)

The new concentration is equal to (mass)/(conc In mL)/6.9/500, which equals 0.0138 g/mL.

Mass = (Concentration in g/mL) x (Volume in mL)

= 0.0138 x 100

answer = 1.38 g

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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:

done

Explanation:

Answer:

Because the sun is low on the horizon, sunlight passes through more air at sunset and sunrise than during the day, when the sun is higher in the sky. More atmosphere means more molecules to scatter the violet and blue light away from your eyes.

Answer:

its c

Explanation:

Answer:

Nitrogen is an inert gas — meaning it doesn't chemically react with other gases — and it isn't toxic. But breathing pure nitrogen is deadly. That's because the gas displaces oxygen in the lungs. Unconsciousness can occur within one or two breaths, according to the U.S. Chemical Safety and Hazard Investigation Board.

Answer:

because it is an insert gas and it is very dangerous for ear and our nose

Silicon contains 14 electrons and thus, its electronic configuration is written as follows:

1s², 2s², 2p⁶, 3s², 3p².

The filling of electron in different orbitals of an atom is called electronic configuration of the element. The electrons fill from the lowest energy levels to highest energy level.

The atomic number of an element is the number of its electron in its atomic state. Silicon is 14th element in periodic table. Hence, silicon contains 14 electrons.

The capacity of s orbital is 2 and that of p orbital is 6. Thus the electronic configuration of silicon can be written as: 1s², 2s², 2p⁶, 3s², 3p².

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Your question is incomplete but your complete question was as follows:

Si,  express your answer in complete form in the order of orbital filling as a string without blank space between orbitals.

Answer:

The role of consumers in an ecosystem is to obtain energy by feeding on other organisms and sometimes transfer energy to other consumers. Changes that affect consumers can impact other organisms within the ecosystem.

Explanation:

Hope this helped Mark BRAINLIEST!!!!

Consumers are organisms that obtain energy by eating other organisms. Consumers may consume either producers or other consumers. Consumers include animals.

A food chain is a network of links in a food web that begins with producer organisms and ends with an apex predator, detritivore, or decomposer species.

A food chain also demonstrates how organisms are related to one another through the food they consume. Each trophic level is represented by a different level of a food chain.

Producers can produce their own food and energy, but consumers are not the same. Consumers are living things that must hunt, gather, and eat their food.

Thus, Consumers must eat in order to gain energy, or they will perish. Omnivores, carnivores, herbivores, and decomposers are the four types of consumers.

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Answer:

International system. The SI unit for specific heat is joule per kelvin per kilogram (J/K/kg, J/(kg K), J K−1 kg−1, etc.). Since an increment of temperature of one degree Celsius is the same as an increment of one kelvin, that is the same as joule per degree Celsius per kilogram (J/°C/kg).

Answer:

Carbon atoms each form four strong bonds. The bonds are covalent (atoms share electrons). This gives graphite its characteristic properties such as high melting and boiling points, good electrical conductivity, and softness. Use as pencil 'lead', as a lubricant in oil, furnace linings, electrodes, neutron moderators in nuclear power stations.

Diamond atoms each form three strong covalent bonds in the same layer and one weak bond to an atom in another layer.  Diamonds have a high level of hardness, thermal conductivity, and optical dispersion. It is used for jewellery, oil-well drills, abrasives and cutting tools.

Explanation:

Structure of Graphite and Diamond (attached below):

Answer:biomass energy, hydropower, and wind energy

Explanation:

The organic molecule that provides a ready source of chemical energy within all cells is ATP. ATP stands for Adenosine triphosphate. It is also known as the energy currency of the cell.

ATP is a molecule that carries energy within cells. It is created by the cellular respiration process of the cell and it provides energy for the cell’s metabolic processes. ATP consists of three phosphate groups, a sugar molecule called ribose and the nitrogenous base adenine. The two phosphates that are closest to the ribose are connected with high energy bonds which when broken, releases a large amount of energy.

ATP is not stored in large amounts within cells. Instead, it is synthesized as it is needed, and broken down immediately after it is used. The breakdown of ATP results in the release of energy which drives cellular processes. The energy in ATP is used for a range of functions such as muscle contractions, protein synthesis, active transport, and cell division. The hydrolysis of ATP into ADP is an important process in biology, as it provides energy for the majority of cellular functions.

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It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal.

To determine the time it takes for both Cs-137 and Co-60 isotopes to decay until their activities are equal, we can use the decay function for each isotope and set them equal to each other.

The decay function for a radioactive isotope is given by:

A(t) = A₀ * exp(-λt)

Where:

A(t) is the activity at time t,

A₀ is the initial activity,

λ is the decay constant,

t is the time.

The decay constant (λ) can be calculated using the half-life (T₁/₂) of the isotope:

λ = ln(2) / T₁/₂

For Cs-137, the half-life is approximately 30.17 years, and for Co-60, the half-life is approximately 5.27 years.

Let's denote the time it takes for both activities to be equal as t_eq.

For Cs-137:

A(Cs-137) = 100 * exp(-0.693 / 30.17 * t_eq)

For Co-60:

A(Co-60) = 300 * exp(-0.693 / 5.27 * t_eq)

Setting the two equations equal to each other and solving for t_eq:

100 * exp(-0.693 / 30.17 * t_eq) = 300 * exp(-0.693 / 5.27 * t_eq)

Simplifying the equation:

1/3.0 * exp(-0.693 / 30.17 * t_eq) = exp(-0.693 / 5.27 * t_eq)

Taking the natural logarithm (ln) of both sides:

-0.693 / 30.17 * t_eq = -0.693 / 5.27 * t_eq

Solving for t_eq:

t_eq ≈ 35.4 years

It will take approximately 35.4 years for both Cs-137 and Co-60 isotopes to decay until their activities are equal. This calculation assumes that there is no other source of radiation or decay affecting the activities of the isotopes.

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Answer:

Aikens/hydrocarbons

Explanation:

because the formula of this is Cn H²n

We need to add 0.025 moles of HCl to the buffer to change the pH by one pH unit.

First, you need to determine the initial pH of the buffer solution. Let's assume it is pH 7.0. Next, let's assume that the buffer is made up of 0.1 moles of weak acid (HA) and 0.1 moles of conjugate base (A-) in 1 liter of solution. This gives us a concentration of 0.1 moles/L for both HA and A-.

Now, if we want to change the pH of the solution by one pH unit, we need to either increase or decrease the concentration of H+ ions by a factor of 10. This means that we need to add either 0.1 moles/L of H+ ions (to decrease the pH) or 0.1 moles/L of OH- ions (to increase the pH).
Since we are adding a strong acid to the buffer, we can assume that it will completely dissociate and provide H+ ions. Let's assume that we are using hydrochloric acid (HCl), which has a concentration of 1 mole/L.

To calculate how much HCl we need to add to the buffer, we need to use the formula:
moles of HCl = (volume of HCl) x (concentration of HCl)
We know that we are starting with 25 ml of buffer, so we need to convert this to liters:
25 ml = 0.025 L
Now we can plug in our values:
moles of HCl = (0.025 L) x (1 mole/L)
moles of HCl = 0.025 moles

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Based on the given information, we can analyze the effects of the tax on consumer surplus, producer surplus, deadweight loss, and total surplus:

Consumer surplus decreases from $200 to $80: This statement suggests that the tax has reduced the benefit received by consumers in the market. Consumer surplus represents the difference between what consumers are willing to pay for a good or service and what they actually pay. If consumer surplus decreases from $200 to $80, it implies that the tax has increased the price consumers have to pay, thereby reducing their surplus .The statement suggests that the deadweight loss in the market due to the tax is $80.

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Suppose a vessel contains HI at a concentration of 0.32 M. The concentration of HI in the vessel 0.88 seconds later is 0.175 M.

Initial concentration of HI = 0.32 M

Time = 0.88 s

Rate is given as 0.684 s⁻¹

The concentration of HI in the vessel 0.88 seconds later. It can be expressed as :

ln (HI) = ln (HI)₀ - (kt)

Where;

(HI)₀ is the initial concentration

k is the reaction rate constant

t is time

Now, we have;

ln (HI) = In (0.32) - (0.684 × 0.88)

ln (HI) = -1.1394 - 0.6019

ln (HI) = -1.7413

(HI) = e^(-1.7413)

(HI) = 0.175 M

Thus, the concentration of HI is 0.175 M.

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This question is incomplete the complete question is :

Consider this reaction: 2 HI(g) ⇄ H₂(g) + I₂(g)

At a certain temperature, this reaction follows first - order kinetics with a rate constant of 0.684 s^(-1). Suppose a vessel contains HI at a concentration of 0.32 M. Calculate the concentration of HI in the vessel 0.88 seconds later. you may assume no other reaction is important. round your answer to significant digits.

Answer:

burrowers

Explanation:

Answer:

The power plants

are inexpensive to build

The balanced chemical reaction for the given chemical equation is given by; 3Ba3N2 + 6H2O → 6Ba(OH)2 + 2NH3. Therefore, the balanced values for w, x, y and z are 3, 6, 6, and 2, respectively.

The balanced chemical reaction for the given chemical equation can be obtained by following the below steps;

Count the number of atoms of each element on both sides of the chemical equation

Find the coefficients to balance the number of atoms on both sides of the chemical equation

Check the balance of the chemical equation

Write down the balanced chemical equation by putting coefficients to the molecules. The balanced chemical reaction is; 3Ba3N2 + 6H2O → 6Ba(OH)2 + 2NH3. Therefore, the balanced values for w, x, y and z are 3, 6, 6, and 2, respectively.

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The parts of a nucleotide are a nitrogenous base, a sugar molecule (which is usually ribose or deoxyribose), and a phosphate group.

Deoxyribose is a type of sugar molecule, specifically a pentose monosaccharide, and is a key component to DNA. Deoxyribose is composed of five carbon atoms, with an oxygen and a hydrogen atom attached to each carbon atom, and an additional oxygen atom attached to the final carbon atom. The molecular formula of deoxyribose is C5H10O4. Deoxyribose is used to form the backbone of the double helix structure of DNA, and the bonds formed between the sugar molecules and nitrogenous bases are known as phosphodiester bonds. The phosphodiester bonds form the rungs of the DNA ladder.

DNA segments and chromosomes are not parts of a nucleotide, however, these structures are made up of multiple nucleotides.

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