How many dozens are in 2.5 moles of eggs? Could you pls explain too.

Answer: 1.67 kg

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

\(Q=m\times c\times \Delta T\)

Q = Heat absorbed=\(4.31\times 10^1kJ\) = \(43100J\)   (1kJ=1000J)

m= mass of substance = ?

c = specific heat capacity = \(0.385J/g^0C\)

Change in temperature ,\(\Delta T=T_f-T_i=6.71\times 10^1^0C=67.1^0C\)

Putting in the values, we get:

\(43100J=m\times 0.385J/g^0C\times 67.1^0C\)

\(m=1670g=1.67kg\)   (1kg=1000g)

Thus the mass (in kg) of the copper sample is 1.67

The functional group in alcohol is a hydroxyl group (-OH), in phenol, it is a hydroxyl group attached to a benzene ring, and in ether, it is an oxygen atom (-O-) between two alkyl or aryl groups.

Given that the question asks to identify each of the following compounds as an alcohol, a phenol, or an ether. The question seems to be incomplete as there are no options or compounds mentioned. However, given below is a general explanation of the three compounds -Alcohol: Alcohol is a compound that contains a hydroxyl functional group (-OH) that is attached to a carbon atom. The hydroxyl group in alcohol makes it polar and thus, able to form hydrogen bonds. Alcohol is used as a solvent, fuel, and disinfectant. Phenol: Phenol is an aromatic compound that contains a hydroxyl group (-OH) attached to a benzene ring. It is used in the production of detergents, plastics, and pharmaceuticals. Phenol is used as a disinfectant and anesthetic. Ether: Ether is an organic compound that contains an oxygen atom between two alkyl or aryl groups. It is a colorless, volatile, and highly flammable liquid that is used as a solvent and as a starting material in the synthesis of organic compounds. To identify a compound as an alcohol, phenol, or ether, we need to examine the functional groups in the molecule.

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Answer:

I think its epicenter

Explanation:

The epicenter is the point on the earth's surface vertically above the hypocenter, point in the crust where a seismic rupture begins.

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

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As you move from left to right across a row of the periodic table, the atomic number increases, meaning there are more protons in the nucleus of the atom.

Atomic number is the number of protons in the nucleus of an atom, which determines its chemical properties and place in the periodic table of elements. The atomic number is represented by the symbol Z and is the whole number located above an element's symbol in the periodic table.

Elements are arranged in order of increasing atomic number, and elements with the same atomic number belong to the same element, regardless of their mass number or number of neutrons.

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Answer:

The hypothesis becomes a theory if the results support it is answer.

Explanation:

I hope it's helpful!

Answer:

mark me as a branlist

Explanation:

determine the number of significant figures in a number use the following 3 rules: Non-zero digits are always significant. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant.

The significant figures that are reported in the mean are The decimal place where the standard deviation starts.

Significant figures (or significant digits) are the number of digits in a given value or a measurement, necessary to decide the accuracy and precision of measurement.

They are important in scientific or technical measurements.

Rules for writing significant figures-

1. Non zero digits are significant.

2. Zeros in between non zero digits are significant

3. Zeros on the right of a decimal point and before (or to the left of) the first non-zero digit are not significant.

4. Zeros present on the right of decimal point are significant.

5. Zeros on the right of the last non-zero digit after a decimal point are significant.

Therefore, The significant figures that are reported in the mean are The decimal place where the standard deviation starts.

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0.52 molar is the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water.

The term molarity is defined as the number of moles of solutes are dissolved in per litre of solution. It is represented by the symbol "M". The unit of molarity is molar(M).

To calculate the molarity of a solution, divide the moles of solute by the volume of the solution expressed in liters.

The formula of molarity = a number of moles of solutes /  litre of solution

Given:

Number of moles = 0.257 moles

Volume = 490ml = 0.49 litre

Molarity = ?

According to the definition of molarity,

Molarity = Number of moles of solute / litre of solution

Molarity =  0.257 moles / 0.49 litre

Molarity = 0.52 molar

Thus, the molarity of a solution in which 0.257 moles of HNO2 is dissolved in 490ml of water is 0.52 molar.

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Answer:

election

Explanation:

The measure of the length of events and the duration of intervals between events is time.

The duration of events or the gaps between them can be measured, compared, or even ordered using time. The lengthy period of time that the Earth's geologic history takes up is known as geologic time. Starting at the beginning of the Archean Eon  formal geologic time runs until the present. Geology is defined as the "Science of the Earth."

Geology is the fundamental Earth science that examines how the earth created, its structure and composition, and the various forces acting on it. It is sometimes known as geoscience or earth science.

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Answer:

Its D and E

Explanation:

i took the test and the other guy who answered gave u half of the answer

hope this helps

pls mark brainliest

The information which can be inferred about the Sun according to the graph include:

This is defined as a pictorial representation of data in an organized manner.

From the graph, we can infer that the Sun has an intermediate temperature and is less brighter than most stars.

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Answer:

B

Explanation:

The number of moles of each reactant is equal, there by pressure has no effect on the chemical system. Pressure is constant

For conversion degree Celsius into kelvin we have to add the value 273 in given value.The temperature in kelvin of 73°C is 346 K.

A temperature converter helps change over the temperature between Fahrenheit and Celsius scale. Temperature is measured using a thermometer.

While Kelvin (K) is the SI unit of temperature, people generally use Centigrade or Celsius (°C) and Fahrenheit (°F) to measure temperature.

For conversion degree Celsius into kelvin we have to add the value 273 in given value.

We have to convert  73°C into kelvin.

Therefore,

= 73 + 273

= 346 Kelvin

Thus, The temperature in kelvin of 73°C is 346 K.

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The mass of the baking soda is 4.5 g

A conversion factor is a ratio that is used to convert one unit of measurement to another. Conversion factors are commonly used in scientific calculations and in everyday life, when we need to convert one unit of measurement to another.

A conversion factor can be derived from the relationship between two different units of measurement.

Given that;

1 oz = 28.35 g

But

1 tsp = 0.212 oz

Thus;

0.750 tsp will be  0.750 tsp * 0.212 oz/1 tsp

= 0.159 oz

Then;

1 oz = 28.35 g

Thus;

0.159 oz =  0.159 oz * 28.35 g/ 1oz

= 4.5 g

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A) The answer to whether an average-size, single-family home be built with one day’s output from the saw mill is; No, it can't be built from one days output

B) The number of days will it take for the saw mill to produce enough lumber to build a neighborhood of 100 average-size homes is; 1100 days

A) From research, the average size capacity saw mill usually produces around 1500 board feet of boards per day.

Now, converting board ft to cubic meter gives;

1 board feet = 1/424 m³

Thus; 1500 board feet = 1500 * 1/424 ≈ 3.54 m³

Now, we are told that it takes 38 m³ of boards and plywood to build an average size single family home.

Since one days output = 3.54 m³

It is less than the volume required for the average sized house and so the daily output will not be sufficient.

B) Number of days to produce enough boards and plywood for the average sized family home = 38/3.54 ≈ 11 days

Thus, for 100  homes;

Number of days = 100 * 11 = 1100 days

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The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.

Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.

Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.

It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.

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Answer:Solid,Liquid,Gas differ from each other by the following ways:-

Solid:It have defined shape.

Liquid:They have an indefinite shape.

Gas:They have no shape:

The density of the He nucleus is approximately 2.8 × 10^17 grams per cubic centimeter (g/cm³).

To calculate the density of the He nucleus, we need to know its mass and volume. Given that the diameter of the nucleus is approximately 2.0 fm, we can calculate its radius as 1.0 fm (since the radius is half the diameter).

The volume of a sphere can be calculated using the formula V = (4/3)πr³, where V is the volume and r is the radius. Substituting the values, we get:

V = (4/3)π(1.0 fm)³

Using the conversion factor that 1 fm = 1 × 10^-13 cm, we can convert the volume from fm³ to cm³:

V = (4/3)π(1.0 × 10^-13 cm)³

Simplifying the equation further, we have:

V = (4/3)π(1.0 × 10^-13)³ cm³

Now, to calculate the density, we need the mass of the He nucleus. The mass of a He nucleus is approximately 4 atomic mass units (4 amu).

Using the conversion factor that 1 amu = 1.66 × 10^-24 g, we can convert the mass from atomic mass units to grams:

Mass = 4 amu × (1.66 × 10^-24 g/amu)

Now we have both the mass and volume. The density (D) of an object is defined as mass divided by volume:

D = Mass/Volume

Substituting the values, we get:

D = (4 amu × 1.66 × 10^-24 g/amu) / [(4/3)π(1.0 × 10^-13)³ cm³]

Simplifying the equation and performing the calculations, the density of the He nucleus is approximately 2.8 × 10^17 g/cm³.

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Answer:

The common sources of outdoor air pollution are emissions caused by combustion processes from motor vehicles, solid fuel burning and industry. Other pollution sources include smoke from bushfires, windblown dust, and biogenic emissions from vegetation (pollen and mold spores).

smog is produced when sunlight reacts with nitrogen oxides in the atmosphere. Nitrogen oxides come from car exhaust, coal power plants, and factory emissions. When sunlight hits these chemicals, they form airborne particles and ground-level ozone—or smog.

The solution in which the most calcium fluoride dissolves is 1M HNO3(aq).

Option (B) is correct.

A system in equilibrium is subjected to change (change in concentration/pressure of reactants/products, temperature, etc.) according to Le Châtelier's principle.

To counterbalance the change and restore equilibrium, the System advances in a direction.

In solution, HNO is a strong acid that will dissociate fully to generate H+ and No3-.

This increasing concentration of H+ will cause the second equilibrium reaction in question to reverse direction, resulting in the production of additional HF.

As a result of the drop in F- concentration, the dissolution equilibrium process of Caf2 moves forward, dissolving more valid CaF2 to produce Ca2+ and F_ and thereby boosting Caf2 solubility.

Thus, HNO3 (B) is the correct option.

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Answer:

B 37.1 g

Explanation:

find the volume of the displaced water 28.54mL - 25.0mL = 3.54 mL displaced by the silver.

3.54 mL x 10.49 g/mL = 37.1g of total silver

Explanation:

Formula for Potential energy=mgh mass* gravity*height

21kg × 10 ×32=6720joules

If a 21.0 kg rock rests on the edge of a cliff 32.0 m high, the gravitational potential energy gained by the rock would be 6585.6 Joules.

Mechanical energy is the combination of all the energy in motion represented by total kinetic energy and the total stored energy in the system which is represented by total potential energy.

As given in the problem a 21.0 kg rock rests on the edge of a cliff 32.0 m high, then we have to calculate the potential energy gained by the rock,

The potential energy of the rock = 21 × 9.8 × 32

                                                      = 6585.6 Joules.

Thus ,If a 21.0 kg rock rests on the edge of a cliff 32.0 m high, the gravitational potential energy gained by the rock would be 6585.6 Joules.

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Approximately 766.08 grams of oxygen are required to completely react with 240g of C₂H₆.

To determine the amount of oxygen required to completely react with 240g of C₂H₆ (ethane), we need to set up a balanced chemical equation for the combustion of ethane.

The balanced equation for the combustion of ethane is as follows:

C₂H₆ + O₂ → CO₂ + H₂O

From the balanced equation, we can see that the stoichiometric ratio between C₂H₆ and O₂ is 1:3. This means that for every one mole of C₂H₆, three moles of O₂ are required for complete combustion.

To calculate the amount of oxygen required, we need to convert the given mass of C₂H₆ to moles using its molar mass, and then use the stoichiometric ratio to determine the moles of O₂ required. Finally, we can convert the moles of O₂ back to grams using the molar mass of oxygen.

The molar mass of C₂H₆ is calculated as follows:

(2 x atomic mass of carbon) + (6 x atomic mass of hydrogen)

(2 x 12.01 g/mol) + (6 x 1.01 g/mol) = 30.07 g/mol

Now, we can proceed with the calculation:

Calculate the moles of C₂H₆:

moles of C₂H₆ = mass of C₂H₆ / molar mass of C₂H₆

moles of C₂H₆ = 240 g / 30.07 g/mol ≈ 7.98 mol

Determine the moles of O₂ using the stoichiometric ratio:

moles of O₂ = moles of C₂H₆ x (3 moles of O₂ / 1 mole of C₂H₆)

moles of O₂ = 7.98 mol x 3 ≈ 23.94 mol

Convert moles of O₂ to grams:

mass of O₂ = moles of O₂ x molar mass of O₂

mass of O₂ = 23.94 mol x 32.00 g/mol = 766.08 g

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Answer:

2 atm

Explanation:

The symbol 'atm' is used for pressure. Hence, the symbol used to indicate the pressure at which a chemical reaction is carried out can be, 2 atm.

The volume of O₂ produced when 8.52 g of Na₂O₂ is added to excess water is approximately 1.17 liters at STP.

When it comes to the ideal gas law, the underlying assumption is that the gas is in a state of thermodynamic equilibrium. This means that its molecules are not interacting with each other except through perfectly elastic collisions.

Equation:

We can use stoichiometry to determine the volume of oxygen gas produced from the reaction of 8.52 g of Na₂O₂.

First, we need to convert the mass of Na₂O₂ to moles using its molar mass:

8.52 g Na₂O₂ × (1 mol Na₂O₂ / 77.98 g Na₂O₂) = 0.1093 mol Na₂O₂

According to the balanced chemical equation, 1 mole of Na₂O₂ produces 1/2 mole of O₂:

2 Na₂O₂ + 2 H₂O → 4 NaOH + O₂

1 mol Na₂O₂ produces 1/2 mol O₂

So, the number of moles of O₂ produced is:

0.1093 mol Na₂O₂ × (1/2 mol O₂ / 1 mol Na₂O₂) = 0.05465 mol O₂

Finally, we can use the ideal gas law to determine the volume of O₂ produced at standard temperature and pressure (STP), which is defined as 0°C (273 K) and 1 atmosphere (1 atm) of pressure:

PV = nRT

At STP, the pressure and temperature are known, so we can rearrange the equation to solve for V:

V = nRT / P

Plugging the values, we get:

V = (0.05465 mol) × (0.08206 L atm mol⁻¹ K⁻¹) × (273 K) / (1 atm)

V ≈ 1.17 L

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INFORMATION:

We have the next statement:

- "An exothermic reaction releases thermal energy."

And we must determine if it is true or false

STEP BY STEP EXPLANATION:

An exothermic reaction is a reaction in which energy is released in the form of light or heat.

Finally, knowing that in an exothermic reaction energy is released in the form of heat, we can say that an exothermic reaction releases thermal energy. So, it is true.

ANSWER:

True

Answer:

Students heat up a metal sample by placing it into a test tube suspended in boiling water. Since the water is boiling, the metal evnetually reaches the same temperature as the boiling water: 100oC. ... Putting the metal sample directly into the water – obviously – gets it wet.

The metal is heated in a dry test tube in order to measure the capacity of the metal.

When performing a chemical experiment, it is important to

Instead of putting the metal straight into the boiling water, it is necessary to measure the capacity by heating it in a dry test tube first.

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