1. CH4 + 02 → CO₂ + H₂O (not balanced)
If 15 moles of CH4 are reacted with 20
moles of 02, how many moles of excess
reactant remain?

As per the given data, the specific heat of the copper sample is approximately 0.384 J/g·°C.

For the specific heat of copper, we can use the formula:

q = mcΔT

Given that:

Mass of copper (m) = 5g

Change in temperature (ΔT) = 50°C - 10°C = 40°C

Heat absorbed (q) = 76.8 J

76.8 J = 5g × c × 40°C

76.8 J = 200g°C × c

c = 76.8 J / 200g°C

c ≈ 0.384 J/g·°C

Thus, the specific heat of the copper sample is approximately 0.384 J/g·°C.

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Answer:

02

Explanation:

all the other options given are compounds

There are approximately 12.7 grams of phosphorus in a 50-gram sample of aluminum phosphate.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to know the molar mass and the chemical formula of aluminum phosphate.

The chemical formula for aluminum phosphate is AlPO4. It indicates that each molecule of aluminum phosphate contains one aluminum atom (Al), one phosphorus atom (P), and four oxygen atoms (O).

To calculate the molar mass of aluminum phosphate, we can add up the atomic masses of its constituent elements based on their stoichiometric ratios:

Molar mass of AlPO4 = (molar mass of Al) + (molar mass of P) + (4 * molar mass of O)

Using the periodic table, we can find the atomic masses of the elements:

Molar mass of Al = 26.98 g/mol

Molar mass of P = 30.97 g/mol

Molar mass of O = 16.00 g/mol

Now, let's calculate the molar mass of aluminum phosphate:

Molar mass of AlPO4 = (26.98 g/mol) + (30.97 g/mol) + (4 * 16.00 g/mol)

= 121.95 g/mol

The molar mass of aluminum phosphate is 121.95 g/mol.

To determine the number of grams of phosphorus in a 50-gram sample of aluminum phosphate, we need to calculate the mass fraction of phosphorus in the compound. The mass fraction is the ratio of the molar mass of phosphorus to the molar mass of aluminum phosphate.

Mass fraction of phosphorus = (molar mass of P) / (molar mass of AlPO4)

= (30.97 g/mol) / (121.95 g/mol)

≈ 0.254

Multiplying the mass fraction by the mass of the sample gives us the grams of phosphorus:

Grams of phosphorus = (mass fraction of phosphorus) * (mass of the sample)

= 0.254 * 50 g

≈ 12.7 g

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Answer:

B) 12

Explanation:

Given parameters:

Initial volume  = 3L

Initial pressure  = 4atm

Final pressure  = 6atm

Unknown:

Final volume  = ?

Solution:

To solve this problem, we apply Boyle's law which states that "the volume of a fixed mass of a gas varies inversely as the pressure changes if the temperature is constant".

   P₁V₁  = P₂V₂

 P and V are pressure and temperature values

 1 and 2 are initial and final states.

    PV product  = 3 x 4 = 12

The \(P \times V\) product of this given sample of gas is equal to: B) 12 atm.

Given the following data:

To determine the \(P \times V\) product of this given sample of gas, we would apply Boyle's law:

Boyle's law states that when the temperature of an ideal gas is kept constant, the pressure of the gas is inversely proportional to the volume occupied by the gas.

Mathematically, Boyle's law is given by the formula;

\(PV = k\\\\P_1V_1 = P_2V_2\)

Where;

Substituting the given parameters into the formula, we have;

\(P \times V = 4 \times 3\\\\P \times V = 12\;atm\)

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These charts typically guide you through a series of questions based on the physical and chemical properties of the mineral, such as color, hardness, cleavage, and reaction to acid.

By answering each question, you can narrow down the possibilities and eventually identify the mineral. Another helpful tool is a handheld mineral identification kit, which includes common minerals and their properties for comparison to the unknown mineral. Observe the physical properties of the mineral, such as color, luster, hardness, cleavage, and fracture, using a magnifying glass or a microscope.

Test the mineral's hardness using a mineral hardness scale, such as Mohs scale, which ranks minerals based on their ability to scratch one another.Test the mineral's streak, which is the color of the powdered mineral, by rubbing the mineral against an unglazed porcelain plate.

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Answer:

it's thermal energy

Explanation:

There are five types of kinetic energy: radiant, thermal, sound, electrical and mechanical.

#carry on learning

Hope it helps

In this exercise we have to use the knowledge of kinetic energy and we can also describe it as a thermal energy.

Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the value of the object's mass and its speed of movement.

Kinetic energy does not depend exclusively on the speed of a body but also on its mass. Any type of body in motion is endowed with this type of energy: translation, rotation, vibration and others.

With these definitions we can write that it will be the same as saying that kinetic energy can be transformed into thermal energy.

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The question requires us to calculate the mass, in grams, contained in 5.26 x 10^-4 mol of HC2H3O2.

To solve this question, first we need to calculate the molar mass of the compound, considering the number of atoms of each element, and then relate the value obtained with the number of moles given (5.26 x 10^-4 mol).

First, to calculate the molar mass of the compound, let's consider the following atomic masses:

atomic mass of C = 12.01 u

atomic mass of H = 1.007 u

atomic mass of O = 15.99 u

Next, we calculate the molar mass. To do that, we need to consider the number of atoms of each element: according to the chemical formula, there are 2 atoms of C, 4 atoms of H and 2 atoms of O:

molar mass (C2H4O2) = (2 * 12.01) + (4 * 1.007) + (2 * 15.99) = 60.03 g/mol

Now, we know that there are 60.03 g for each mol of the compound. With that information, we can estabilish the following relation to calculate the mass contained in 5.26 x 10^-4 mol of the compound:

1 mol --------------------- 60.03 g

5.26 x 10^-4 mol ----- x

Solving for x, we have:

Therefore, there are 0.03158 g of HC2H3O2 in 5.26 x 10^-4 mol of this compound.

Answer:

8

Explanation:

The reaction of 2-pentyne (an internal asymmetric alkyne) with H2O, H2SO4, and HgSO4 would undergo acid-catalyzed hydration to yield two ketone products. The predicted organic product is

2- Pentyne + H2O/H2SO4/HgSO4 → 2-Pentanone + 3-methyl-2-pentanone

The first ketone product is 2- pentanone, which is formed by the addition of a water molecule across the triple bond, resulting in the formation of a ketone group.

The second ketone product is 3-methyl-2-pentanone, which is formed by the addition of a water molecule across the triple bond, resulting in the formation of a ketone group. In this case, due to the internal asymmetry of 2-pentyne, the addition can occur on either side of the triple bond, leading to the formation of two isomeric ketones. The given name represents one of the possible isomers.It's important to note that the reaction is acid-catalyzed, with H2SO4 serving as the acid catalyst and HgSO4 playing a role in the overall reaction. The acid catalyst facilitates the addition of water across the triple bond, while HgSO4 helps in activating the triple bond for hydration.

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Answer:

It's charge will be positive

Explanation:

4>2

Answer:

14cm^3

Explanation:

Answer:

exosphere thermosphere mesosphere stratosphere troposphere

The boiling point of a 5 molal solution of LiF will be 102.56 °C. To determine the boiling point of a 5 molal solution of LiF, we need to use the equation: ΔTb = Kb x molality

ΔTb is the change in boiling point, Kb is the boiling point elevation constant for water (which is 0.512 °C/m), and molality is the number of moles of solute per kilogram of solvent.

First, we need to calculate the molality of the LiF solution. A 5 molal solution means that there are 5 moles of LiF per kilogram of water. The molar mass of LiF is 25.94 g/mol, so 5 moles of LiF weigh 129.7 g. We need to add this to 1 kg of water to get the total mass of the solution:

mass of solution = mass of water + mass of LiF = 1000 g + 129.7 g = 1129.7 g

Now we can calculate the molality:

molality = moles of solute / mass of solvent (in kg) = 5 mol / 1 kg = 5 mol/kg

Next, we can plug in the values we know into the boiling point equation:

ΔTb = Kb x molality
ΔTb = 0.512 °C/m x 5 mol/kg
ΔTb = 2.56 °C

Therefore, the boiling point of a 5 molal solution of LiF will be elevated by 2.56 °C. To find the actual boiling point, we need to add this to the normal boiling point of water, which is 100 °C at standard atmospheric pressure:

Boiling point = normal boiling point + ΔTb
Boiling point = 100 °C + 2.56 °C
Boiling point = 102.56 °C

So the boiling point of a 5 molal solution of LiF will be 102.56 °C.

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Answer:

B. The coefficients give the molar ration of the reactants

Explanation:

The pH of a 0.050 M ammonia solution is 12.699 using the appropriate number of significant figures.

Significant figures are used for establishment  of a number which is presented in the form of digits. These digits give a meaningful representation  to the numbers.

The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.pH can also be reported in significant figures.

pOH =-log(OH⁻)=-log(0.050)=1.301, thus pH= 14-1.301=12.699.

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Answer:

hypothesis testing is usually used to assess the plausibility of a hypothesis by using sample data

Explanation:

Answer:

I'm assuming this is from a lab that you did - in which case, I can't really help you out here.

Explanation:

In the production of alum, excess reactants are typically removed through a process known as "recrystallization."

Here's how it works: Dissolution: First, the alum crystals are dissolved in hot water. This process allows the excess reactants (i.e. any unreacted sulfuric acid or aluminum hydroxide) to also dissolve in the water. Cooling: The solution is then allowed to cool slowly. As it cools, the solubility of the alum decreases and it begins to crystallize out of the solution. At the same time, any excess reactants that are still dissolved in the water will remain in solution.

Filtration: Once the crystals have formed, the solution is filtered to separate the solid alum crystals from the remaining liquid. The excess reactants that are still in solution will pass through the filter and be discarded. Washing: The alum crystals are then washed with cold water to remove any remaining impurities or unreacted reactants that may be stuck to the surface of the crystals.

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A subunit of an organic compound that confers particular chemical and physical properties is termed, a functional group. Correct answer: letter C.

These groups are responsible for the reactivity of the molecule and the way it interacts with other molecules.

Functional groups are important components of organic compounds. They are groups of atoms that are responsible for the unique physical and chemical properties of an organic compound. These properties, in turn, determine the behavior of a compound in a variety of reactions.

Functional groups are key to understanding why organic compounds behave the way they do. For example, an organic compound with a hydroxyl group (OH) is likely to react differently than one without it. As the hydroxyl group is responsible for the compound's behavior, it can be said that the hydroxyl group is a subunit of the organic compound that confers particular chemical and physical properties.

A subunit of an organic compound that confers particular chemical and physical properties is termed ________

A) A monomer.

B) An oligomer.

C) A functional group.

D) A synthetic unit.

E) An isomer.

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X=10

Explanation and workout is in the photo attached with this answer

The formula mass of hydrated sodium sulfate is Na₂SO₄.10H₂O. The value of x is equal to 10.

A mole is the amount of substance containing the same number of elementary entities as the number of atoms present in a pure sample of any element.

A mole is also described as the amount of a substance that contains 6.022×10²³ fundamental entities of the given substance.

The mole concept is a convenient method of representing the amount of a substance.

Given, the mass of the hydrated sodium sulfate = 10.0g

The mass of the anhydrous sodium sulfate is produced = 4.40g

Mass of the water evaporated as water on heating = 10.0 - 4.40 = 5.6g

The number of moles of water = 5.6/18 = 0.31 mol

Similarly, the number of moles of sodium sulfate = 4.4/142.04 = 0.031 mol

The ratio of the number of the moles of the sodium sulfate and water:

\(\frac{n(H_2O)}{n(NaSO_4)}=\frac{0.31}{0.031} = 10\)

Therefore, the ten moles of water will be evaporated for the one mole of sodium sulfate. Therefore, the formula mass is Na₂SO₄.10H₂O.

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As the concentration of pnf increases, the measured absorbance of the solution decreases.

The absorbance of a solution decreases as the concentration of p-nitrophenol (pnp) increases. This is because more molecules are present, which increases the chance that a photon will be absorbed and the pnp molecule will be converted into a more stable form. This increase in the concentration of pnp can be measured using a spectrophotometer, which measures the amount of light absorbed by a sample of the solution. The spectrophotometer emits a beam of light at a specific wavelength and measures the amount of light that is absorbed by the sample. The amount of light absorbed is directly proportional to the concentration of pnp in the solution, which means that as the concentration of pnp increases, the absorbance of the solution decreases.

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The phospholipid bilayer barrier between the cell and its external environment called as the Plasma membrane of the cell.

The plasma membrane of the cell is defined as the cell membrane which found in all cells that separates the interior of the cell from the outside environment. The cell wall is attached to the plasma membrane on the outside surface of the plant cell and bacterial cell. Plasma membrane consists of the lipid bilayer that is semipermeable. That regulates the transport of materials entering and exiting the cell. This provides protection for a cell. It provides the fixed environment inside the cell. Cell membrane has several different functions in the cell. This membrane transports nutrients into the cell and also to transport toxic substances out of the cell. Cell membrane  have proteins on it that interact with other cells.

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Answer:

The balance equation of Ca(OH)2 + HCl ---> CaCl2 + H2O​

is

Ca(OH)2(s) + 2HCl(aq) ---> CaCl2(aq) +2H2O​ (l) (balanced equation)

Answer:

392g

Explanation:

The given compound is;

         Cr₂(SO₄)₃

To find the molar mass, we sum the atomic masses of the elements in the compounds together.

Atomic mass of Cr  = 52

                           S  = 32

                            O  = 16

So;

 Molar mass  = 2(52) + 3[32 + 4(16)]  = 392g/mol

option D Balanced force

Two electrons are lost by Mg and gained by N

Electrons can be lost or gained in a chemical reaction. In fact, the process of gaining or losing electrons is central to many types of chemical reactions.

Chemical reactions involve the transfer of electrons between atoms or molecules, which can result in the formation of new compounds or the breakdown of existing ones. When an atom or molecule gains one or more electrons, it becomes negatively charged and is said to be reduced. Conversely, when an atom or molecule loses one or more electrons, it becomes positively charged and is said to be oxidized.

We can see that we can write this reaction as;

3Mg^0 + N2^0  ---->3Mg^+ + N^2-

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Answer:

Mendel, Inheritance/Heredity

Explanation:

Gregor Mendel (1822-1884) was an Austrian monk and scientist as stated in this question. He is referred to as the FATHER OF GENETICS due to his immense contributions to the principle of inheritance.

Gregor Mendel via his several works conducted on pea plants was able to demonstrate how traits passed down from parents to offsprings in a process called INHERITANCE OR HEREDITY.

Your Answer is : 1st Mendel  and 2nd heredity.

Explanation:

Answer:

b

Explanation:

bbbbbbbbbbbbbb

Answer:

I think its B

Explanation:

Ba+2 + 2Cl- + 2Na+ + SO4- ----> BaSO4 is not soluable so you can't break that up.

BaSO4 (s) + 2 Na+ + 2Cl-

Answer:

Jay Bennett

Fentanyl

Opioid

extreme happiness, drowsiness, nausea, confusion, constipation, sedation, tolerance, addiction, respiratory depression and arrest, unconsciousness, coma, and death.

In Urine

Why did Jay overdose on Fentanyl?

Explanation:

I looked all of this up

Answer:

Explanation:

A perfect diamond is a single molecule made of carbon atoms.

DNA is a super long molecule that has information uniquely describing every human being.

When two or more atoms chemically bond together, they form a molecule.

They are very small in size.

They have space between them.

They are in constant random motion.

molecules move when Particles move rapidly in all directions but collide with each other more frequently than in gases due to shorter distances between particles.

In 1926, French physicist Jean Perrin received the Nobel Prize in physics for proving, conclusively, the existence of molecules.

Molecules can exist in free state because they are very stable.

The smallest particle of a compound capable of existing on its own is a Molecule-not a atom.