The density of liquid water is 1.0 g/ml and the specific heat capacity of water is 4.186 J/g°C. How much energy is lost when you cool 500 ml of water at 75°C to 30°C?

The number of moles of N2 produced in the reaction is 3.69 moles. To calculate the number of moles of N2 produced in a reaction, we need to use the ideal gas law equation, PV = nRT.

In this equation, P represents pressure, V represents volume, n represents the number of moles, R represents the gas constant, and T represents temperature.
First, we need to convert the temperature to Kelvin by adding 273.15 to 21.5, which gives us 294.65 K.
Next, we need to convert the volume to litres by dividing 110.0 mL by 1000, which gives us 0.110 L.
Now we can plug in the values we have into the ideal gas law equation:
(2.75 atm)(0.110 L) = n(0.0821 L atm/K mol)(294.65 K)
Simplifying this equation, we get:
0.3025 = 0.0821n
To solve for n, we divide both sides by 0.0821:
n = 3.69 moles of N2

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Answer  usually expressed In the units of the last Qrder of the value of the ... one, two or three significant figures, we find the value of the root in the tn ... The numbers in the table can be regarded as the right-hand ... 1.63 5.1039 0.1959.

Explanation: I hope this helps <3

By collecting materials and preparing the solutions, placing brine shrimp in the petri dishes, adding different solutions to the petri dishes, observing the behavior of brine shrimp, and recording the results

To determine if there are differences among the brine shrimp that hatched in the solutions of 0%, 1%, and 2% sodium chloride, a laboratory researcher can carry out the following steps;

Step 1: Collecting materials and preparing the solutionsA laboratory researcher needs to collect materials such as a microscope, brine shrimp eggs, three petri dishes, and sodium chloride. The laboratory researcher then needs to prepare three different solutions, one containing 0% sodium chloride, another with 1% sodium chloride, and the last one with 2% sodium chloride. The researcher should mix the sodium chloride thoroughly with water in separate containers.

Step 2: Placing brine shrimp in the petri dishes Using a dropper or pipette, the laboratory researcher places ten brine shrimp eggs in each of the three petri dishes.

Step 3: Adding different solutions to the petri dishes. The laboratory researcher adds the 0%, 1%, and 2% sodium chloride solutions to the corresponding petri dishes.

Step 4: Observing the behavior of brine shrimp. The researcher carefully observes the behavior of the brine shrimp in each petri dish. The researcher should observe the time it takes for the eggs to hatch, the survival rates of the brine shrimp, and any other differences in their growth and development.

Step 5: Recording results .After making observations, the researcher records the results in a table or spreadsheet and compares the results to determine if there are any significant differences in the behavior of the brine shrimp hatched in the three different sodium chloride solutions.

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Answer:

Friction is the force that opposes the motion of a solid object over another. There are mainly four types of friction: static friction, sliding friction, rolling friction, and fluid friction.

The pH of the 0.0250 M solution of 4-hydroxypyridine with a pKb of 10.80.

To find the pH of a 0.0250 M solution of 4-hydroxypyridine with a pKb of 10.80, follow these steps:

1. Calculate the Kb value:

Kb = 10^(-pKb) = 10^(-10.80)
2. Use the Kb value and the concentration of the solution to set up an equilibrium expression:

Kb = [OH-][4-hydroxypyridinium ion]/[4-hydroxypyridine]
3. Assume the change in concentration due to ionization is "x", then the equilibrium expression becomes:

Kb = x^2 / (0.0250 - x)
4. Since the Kb value is very small, we can approximate x to be much smaller than 0.0250. Therefore, the expression becomes:

Kb ≈ x^2 / 0.0250
5. Solve for x:

x = sqrt(Kb * 0.0250) = sqrt(10^(-10.80) * 0.0250)
6. x represents the concentration of OH-, so calculate the pOH:

pOH = -log10(x)
7. Finally, find the pH using the relationship:

pH = 14 - pOH

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The true statement about mixtures is that they do not have specific compositions (option B).

Mixture is a substance made up of two or more chemical components that are not chemically linked.

This further means that the constituents of a mixture maintain or keep their individual chemical identities because there is no breaking of bonds.

As opposed to mixtures, compounds are made up of constituents that are chemically bonded to one another, hence, possess a definite composition.

Examples of mixtures are as follows:

Therefore, the true statement about mixtures is that they do not have specific compositions.

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Explanation:

a process for separating minerals from gangue by taking advantage of the differences in their hydrophobicity.

I believe that is accurate

hope this helped have a nice day

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Answer:

C

Explanation:

I am not 100% sure, but it might be the answer.

The correct answer is that proton is the subatomic particle that gives the nucleus an overall positive charge.

A proton is a stable subatomic particle with the designations p, H+, or 1H+ with an electric charge of +1 e. (elementary charge). Its mass is just somewhat less than a neutron and 1,836 times more than that of an electron (the proton–electron mass ratio). Protons and neutrons, which have masses of around one atomic mass unit each, are together referred to as "nucleons" (particles present in atomic nuclei).

One or more protons can be found in the nucleus of every atom. They provide the main electrical attraction and holding power for the atomic electrons. An element may be identified by its atomic number, which is the quantity of protons in its nucleus (represented by the symbol Z).

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Answer:

Yes they can

Haploid cells are mostly sex cells and these cells usually undergo meiosis.

Hope this helps.

Answer:

No, haploid cells have only one set of chromosomes that can be multiplied.

Explanation:

tell me if i am wrong also if i am wrong i am sorry

In an emergency, the best method of contacting help in your community is to call the local emergency services number, such as 911 in the United States.

This will connect you to a dispatcher who can send police, fire, or medical assistance to your location as needed. Make sure to provide clear and accurate information about the situation, your location, and any relevant details to ensure a timely and effective response from the emergency services.

Stay calm and follow any instructions given by the dispatcher until help arrives.

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The Ka for the acid can be calculated using the pH of the solution. The pH of 2.64 indicates that the concentration of H+ ions in the solution is 10^(-pH), which is equal to 10^(-2.64).

To find the concentration of the acid, we can use the equation:

[H+] = [A-] = √(Ka × C)

Where [H+] is the concentration of H+ ions, [A-] is the concentration of the acid, Ka is the acid dissociation constant, and C is the concentration of the solution.

Given that the concentration of the solution is 0.0158 M, we can substitute the values into the equation:

10^(-2.64) = √(Ka × 0.0158)

Squaring both sides of the equation, we have:

10^(-5.28) = Ka × 0.0158

Simplifying the equation:

Ka = 10^(-5.28) / 0.0158

Using a calculator, the Ka value can be determined.

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Answer:

Put simply, Asexual reproduction is reproduction without the use of gametes or the number of chromosomes being changed. So they are genetically identical creatures. Some animals include wasps,  lizards, sharks, turkeys, and sea urchins.

Sexual reproduction includes chromosomes and gametes being fused, creating genetically different offspring. Examples of creatures that reproduce sexually are humans, chickens, cow, pigs, etc.

Explanation:

A binary star system is made of stars, two of which is brighter than the other.

Astronomers are able to detect the dimmer star because its gravity causes the bright star to wobble

Astronomers can also spot the dimmer star by observing a phenomenon called a(n)  eclipsing binary. This happens when the dim star passes in front of the bright star.

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The can will burst at 938.45 K.

Gay Lussac's Law states that the pressure of a fixed amount of gas is directly proportional to the absolute temperature at constant volume.

i.e. P ∝ T

P= KT

P₁ = KT₁

P₂ = KT₂

Here we have considered that the gas is at two different temperatures and pressures which is denoted by T₁ , T₂ and P₁ , P₂

It can also be written as

(P₁ /P₂ )  = (T₁ / T₂)

It is given that

P₂ = 14.29 atm

P₁  = 4.535 atm

T₁ = 298.15 K

T₂ = ?

T₂ = (298.15 * 14.29 )/ 4.54

T₂ = 938.45 K

Therefore the can will burst at 938.45 K.

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Answer :position

Explanation:

Potential energy is the energy stored in an object due to its position

Answer:

Biology is the study of nature, like plants and animals, while anatomy is the study of the human body, like our bones and muscles.

Explanation:

Hope it helped!

If this atom has one additional neutron but the other subatomic particles remained the same as shown, this slightly different atom would be called an isotope.

An isotope is a variant of an atom that has a different number of neutrons. Because isotopes of the same element have the same number of protons in the nucleus, they all have the same atomic number. However, they can differ in mass number, and therefore in atomic mass. In a neutral atom, the number of protons in the nucleus equals the number of electrons that orbit the nucleus, giving the atom a net electrical charge of zero.

However, the number of neutrons in the nucleus can differ, implying that isotopes of the same element may have different atomic masses.

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The balanced chemical equation of combustion of propanol is 2 C₃H₇OH +9 O₂\(\rightarrow\) 6 CO₂ +8 H₂O.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Two elements having same properties as magnesium are calcium and strontium. The number of protons and neutrons in  potassium is 19 and number of neutrons is 20.

Groups in periodic table are vertical columns with elements of similar physical and chemical properties. All elements are classified into different groups based in the number of valence shell electrons.

Elements of same group have same number of valence electrons. The element magnesium Mg have 12 electrons with 2 valence electrons. Its group members are shown under Mg in the column and they are calcium, strontium and rubidium.

Number of electrons in an tom is equal to the number of protons and this is called the atomic number. The atomic number o potassium is 19 and it have 19 electrons and protons.

Number of electrons = mass number-number of protons

                                   = 39 -19 =20.

Hence, potassium  (K) have 19 electrons and protons and 20 neutrons.

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Answer:

Bonds are polar when one element in a compound is more electronegative than the other. This creates a dipole in the molecule where one end of the molecule is partially positive and one end is partially negative

Explanation:

ANSWER

The approximate volume of the gas is 0.13L

EXPLANATION

Given data

The number of moles of the gas = 0.600 mol

The temperature of the gas = 15.00 degrees Celcius

The pressure of the gas = 1.10 atm

To find the volume of the gas, follow the steps below

Step 1: Assume the gas is an ideal gas

Since the gas is assumed as an ideal gas, hence we can use the ideal gas equation to find the volume of the gas.

The equation is written below as

Where,

P is the pressure of the gas'

V = volume of the gas

n is the number of moles

T is the temperature of the gas

R is the universal gas constant

Step 2: Convert the temperature to Kelvin

Step 3: Substitute the given data into the formula in step 1

Hence, the approximate volume of the gas is 0.13L

Answer:

1. a

2.b

Explanation:

Answer: Physical properties, but not in its identity

Explanation:

Physical changes only change the substances physical properties, not the substance’s identity

The giant crusher lifted the boulders and quickly pulverized them into a uniform gray powder.

Pulverization is defined as the process of applying an external force to a solid material of a certain size to destroy it and reduce it into pieces that are smaller than the original size. It has long been done for many materials including ore, glass, ceramics, grains, paints and medicines. The purpose of pulverization are for the pretreatment for separation of active ingredients, production of powder with particle size suitable for the purpose, surface modification of particles, formation of particles composites and the pretreatment of material synthesis. It is being used not only for reducing particle size but also as an operation for developing new materials.

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Answer:D). C3H6N

Explanation:applesause