forms of ENERGY that can be used to generate heat, AND discuss the processes of CONDUCTION, CONVECTION and RADIATION.

(cannot be electrical energy)

Answer:

Molecular formula is, C₃H₆O₃

Empirical formula (with the lowest subscript) → CH₂O

Explanation:

We assume that the organic acid's mass is 0.6 g. We know that, in 0.6 g of compound we have 0.24 g of C and 0.04 g of H, then, we have

(0.6 - 0.24 - 0.04) = 0.32 g of O.

We determine each mol:

0.24 g /12 g/mol = 0.02 mol of C

0.04 g/ 1g/mol = 0.04 mol of H

0.32 g/ 16 g/mol = 0.02 mol of O

1 mol of acid weighs 90 g/mol.

In 0.6 g of acid, we have, (0.6 g / 90g/mol) = 0.0067 moles

Let's find out the formula with rules of three:

0.00667 mol of acid have 0.02 moles of C

1 mol of acid may have (0.02 /0.00667) = 3 mol of C

0.00667 mol of acid have 0.04 moles of H

1 mol of acid may have (0.04 /0.00667) =  6 mol of H

0.00667 mol of acid have 0.02 moles of O

1 mol of acid may have (0.02 /0.00667) = 3 mol of O

Molecular formula is, C₃H₆O₃

We confirm by the molar mass: 12g/mol . 3 + 6 . 1g/mol + 32g/mol . 3 = 90

Empirical formula (with the lowest subscript) → CH₂O

Answer:

Mg3(PO4)2 + 6 K → 2 K3PO4 + 3 Mg

Reaction type:

single replacement

Explanation:

0.24 grams of LiOH are needed to make 100 ml of a 0.1 M solution

The unknown compound with the molecular formula C6H15N is likely a tertiary amine, specifically N,N-dimethylhexylamine.

Based on the given 1H NMR absorptions, we can analyze the chemical shifts and multiplicity to deduce the structure of the compound.

The singlet at 0.9 ppm (1H) indicates the presence of a methyl group (CH3). The triplet at 1.10 ppm (3H) suggests the presence of a methyl group adjacent to two chemically equivalent protons. The singlet at 1.15 ppm (9H) corresponds to three chemically equivalent methyl groups. Lastly, the quartet at 2.6 ppm (2H) indicates the presence of a CH2 group adjacent to two chemically equivalent protons.

Putting these pieces of information together, we can propose the structure of N,N-dimethylhexylamine (C6H15N). In this structure, there is a hexyl chain (CH2-CH2-CH2-CH2-CH2-CH3) with a tertiary amine group (N-CH3) attached to one end.

To confirm the structure, further characterization techniques such as IR spectroscopy or mass spectrometry could be employed.

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A polymer-based material can be characterized using various techniques and instruments.

Here's how to determine whether the polymer is a thermoset, the amount of filler present in it, what the filler is, and the quantity of antioxidants and UV absorbents present:

1. To determine if the polymer is a thermoset, heat it. Thermosets don't melt, but thermoplastics do.

2. To determine the amount of filler in the polymer, weigh a sample of the polymer and then burn it. The residue will be the filler. Subtract the residue's mass from the polymer's initial weight to determine the filler's weight.

3. To determine what filler is present, observe the residue after burning.

4. UV absorbents can be detected using UV-Vis Spectroscopy, while antioxidants can be determined using FTIR Spectroscopy.

5. To determine if the material has dye or pigment coloring, use colorimetry to measure its color, then compare it to the reference color of the polymer. If the color is different, it has dye or pigment coloring.

6. The polymer's thermoset can be identified using Differential Scanning Calorimetry (DSC) to examine the melting temperature, which is unique to each thermoset.

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Answer:increases by a factor of 10

Explanation: the concentration of the solution changed from 4 to 3

Answer:

Mesosphere

Stratosphere

Thermosphere

Troposphere

Exosphere

Explanation:

The exosphere refers to the farthest region of the atmosphere that gradually fades into space.

The troposphere is the lowest layer of atmosphere. It is the layer where weather changes occur.

The thermosphere is right above the mesosphere but just below the exosphere. It is the layer where photoionization/photodissociation of molecules occurs thereby creating ions. This largely owes to interaction of molecules in this layer with ultraviolet radiation.

The stratosphere is composed of gases. Prominent among them is ozone which serves as a blanket against the sun's ionizing radiation.

The mesosphere lies above the stratosphere but just below the thermosphere. Temperature decreases steadily with height in the mesosphere.

The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

The atmosphere has been consisted of the 5 layers that protect the earth. The layers have been present at the height that and each layer has consisted of different constituents.

The layers of the atmosphere can be described as:

The 5 layers of the atmosphere are the troposphere, stratosphere, mesosphere, thermosphere, and exosphere.

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The type and number of electrons transferred between the two elements depend on the location of each element in the periodic table. Generally, metals lose electrons to form cations, while nonmetals gain electrons to form anions.

Electrons are tiny particles that carry a negative charge and orbit the nucleus of an atom. They are the building blocks of matter, and their properties are the basis for understanding the behavior of all matter. Electrons are the smallest known particles, and have a mass that is approximately 1/1836th of a proton. Electrons are part of the electromagnetic force and are responsible for electrical, chemical, and optical behavior. Electrons can move from one atom to another, and this is what allows them to form bonds and create molecules. Electrons also form a cloud of negative charge around the nucleus of an atom, helping to keep the atom stable and together. The electrons of an atom can also interact with other atoms and particles, and this is what allows them to form compounds and materials.

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Scientific notation is a way that makes it possible to express too large or too small numbers, being written in the decimal form, and all the extra numbers will be reduced to a number between 1 and 9.9 multiplied by 10 raised to some power

In the case of the question we have the addition of two numbers in scientifc notation

Instead of being 12600 + 25000, it is 1.26*10^4 + 2.50*10^4, which is equal to

37600 or in scientific notation = 3.76*10^4

Answer:

486 grams

Explanation:

No of moles = mass in gram / molar mass

Mass in gram = No of moles × molar mass

Molar mass of CaCO3 = 40+12+(16*3)

= 40+12+48 = 100 amu

Mass in gram = 4.86 × 100

Mass in gram 486 grams

Answer:The answer is group 1 and alkali metals

Explanation:The elements in group one are alkali metals and have 1 valance electron

Which of the following statements best explains the trends in boiling points?

A. The atomic size increases down the group, and this decreases the strength of the intermolecular forces.

                                           A is incorrect

B. The total number of electrons decreases down the group, and this decreases the strength of the intermolecular forces.

                                            B is incorrect

C. The total number of electrons increases down the group, and this increases the strength of the intermolecular forces.

                                             C is correct

D. The chances of forming a permanent dipole increases down the group, and this increases the strength of the intermolecular forces.

                                              D is incorrect

The boiling point increase down a group because the total number of electrons increases down the group, and this increases the strength of the intermolecular forces. Hence option C is correct.

Boiling point of a substance is the temperature at which the substance changes from its liquid state to vapour state. Boiling point of a molecule or compounds depends on the bond type, molecular weight, temperature and pressure.

For ionic compounds, boiling point will be higher since ionic bonds are stronger than covalent compounds. There is a periodic trend for the physical properties such as boiling point for elements in periodic table.

Down a group, the number of electrons increases and the atomic size also as well as the ionic character increases down a group . These two facts leads to higher intermolecular attraction, thus more temperature have to applied to weaken the bonds.

Higher temperature to be applied means the boiling point of the substance is higher. Therefore, boiling point down a group increases because of the higher intermolecular attraction as said in option C.

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Answer:

copper cathodes are normally referred to when talking about copper. Cathode is the purest form of copper and is the feedstock used to produce copper wire, cable, sheet, strip, tube, etc.

Explanation:

The speed of the 4 kg ball at the given position is approximately 1.21 m/s.

When a 4 kg ball swings in a vertical circle on the end of a 60 cm long string, and the tension in the string is 20 N when its angle from the highest point on the circle is θ = 30°, we can determine the centripetal force acting on the ball and its speed at that position.

First, let's convert the string length to meters: 60 cm = 0.6 m. At the given angle, we can use the following equation to find the centripetal force (Fc) acting on the ball:

Fc = T - mg * cos(θ)

where T is the tension (20 N), m is the mass of the ball (4 kg), g is the acceleration due to gravity (approximately 9.81 m/s²), and θ is the angle (30°).

Fc = 20 - 4 * 9.81 * cos(30°)

Fc ≈ 9.64 N

Now, we can find the speed (v) of the ball at that position using the centripetal force formula:

Fc = (m * v²) / r

where r is the radius (0.6 m).

Rearranging the formula to solve for v:

v = √(Fc * r / m)

v = √(9.64 * 0.6 / 4)

v ≈ 1.21 m/s

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When assigning priorities to groups in organic chemistry, it is important to understand the chemical structure of the molecule. One factor that can affect the priority of a group is the presence of a C=O group versus a CH2OH group.

A C=O group is assigned a higher priority than a CH2OH group because the C=O carbon is treated as if it is bonded to two oxygen atoms, whereas a CH2OH group is only bonded to one oxygen atom. This is due to the fact that the C=O group is a carbonyl functional group, which has a higher priority than the hydroxyl functional group of a CH2OH group. In order to assign priorities to groups, chemists use a set of rules known as the Cahn-Ingold-Prelog priority rules. These rules are based on the idea that atoms or groups with higher atomic numbers or molecular weights should be given higher priority.

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Answer:

Quito is the one..

Answer:

750 m

Explanation:

Hi there!

We're given that:

⇒ The speed of the car is 25 meters/second

⇒ The car travelled a certain distance in 30 seconds

To calculate distance, use the formula:

Distance = Speed × Time

Distance = 25 × 30

Distance = 750

Therefore, the car travelled a distance of 750 m in 30 seconds.

I hope this helps!

Answer:

\(\boxed {\boxed {\sf 750 \ meters}}\)

Explanation:

We are asked to find the distance a car traveled. Distance is the product of speed and time.

\(d= s \times t\)

The speed of the car is 25 meters per second. The time is 30 seconds.

\(d= 25 \ m/s * 30 \ s\)

The units of seconds cancel each other out.

\(d= 25 \ m * 30\)

\(d= 750 \ m\)

The car traveled 750 meters in 30 seconds at a speed of 25 meters per second.

To find the molar mass of the given compound, we have use the molar masses of each element present in the molecule and multiply them by the number of atoms of each element in the molecule. Once we have these values, add them.

It means that we have to multiply the molar mass of Cr times 1, the molar mas of N times 2 and the molar mass of O times 6:

It means that the molar mass of Cr(NO3)2 is 176g/mol.

A compact disc is a heterogeneous mixture, filtered tea is a Homogeneous mixture, freshly extracted orange juice is heterogeneous, aluminum oxide is a compound, and selenium is an element.

That is untrue. They really have different meanings and are different terms. A structure that is heterogeneous has pieces or components that are different from one another and that seem irregular or variegated. J

The look and content of a homogenous mixture are constant throughout. Solutions are a general term for many homogenous mixes. A heterogeneous mixture is made up of clearly distinct components or stages. The three different states or phases of matter are solid, liquid, and gas.

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Answer:

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect? Energy of electrons depends on light's frequency, not intensity. A change in which property of light will have no effect on whether or not the photoelectric effect occurs?

Explanation:

Explanation:

ionic compunds ............

Answer:

Look in the picture ;)

Explanation:

Natrium oxide has a molecular mass of 61.98 gmol1. The actual formula for calculating the Gram Molecular Mass of a substance is : Gram Formula Mass = mass of the solute/formula mass of the solute.

The formula weight is a quantity in chemistry that is calculated by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element in the formula, then adding all of these products together. Sodium oxide or Natrium oxide has a molecular mass of 62 amu, which is the sum of two sodium atoms and one oxygen atom. The mass of sodium is 23 amu. Because there are two sodium atoms, the mass of sodium in the molecules is 223=46 amu. Because there is only one Oxygen atom in the molecule, the mass of oxygen in the molecule is 16 amu because it has 8 protons and 8 neutrons. To calculate the molecule's mass, add the mass of sodium (46 amu) and the mass of oxygen (16 amu).

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Answer: C

Explanation: just took the quiz

Electrostatic force between molecules of unknown liquid is higher and stronger than water.

According to the comparison, electrostatic forces between molecules in the unknown liquid are stronger than the electrostatic forces between water molecules. Due to this stronger electrostatic force between molecules of unknown liquid, the unknown liquid needs more heat energy for the breaking of bonds between atoms.

So due to strong electrostatic force between molecules, the unknown liquid needs high temperature than water so we can conclude that electrostatic force between molecules of unknown liquid is higher and stronger than water.

Answer:

4. 1.5moles

5. 0.405moles

6. 1 mol

Explanation:

To find the number of moles in each susbtance in this question, we divide each number of atom/molecule measurement by Avagadro's number (6.02 × 10^23 atoms)

That is; nA = n × 6.02 × 10^23 atoms

n = nA ÷ 6.02 × 10^23 atoms

Where;

nA = number of atoms

n = number of moles

4.) n of Carbon = 9.03 x 10^23 ÷ 6.02 × 10^23

n = 1.5 × 10^ (23-23)

n = 1.5 × 10^0

n = 1.5 × 1

n = 1.5moles.

5.) n of H2O = 2.44 x 10^23 ÷ 6.02 × 10^23

n = 0.405 × 10^ (23-23)

n = 0.405 × 10^0

n = 0.405moles

6.) n of lithium = 6.02 x 10^23 Li atoms ÷ 6.02 × 10^23

n = 1 × 10^ (23-23)

n = 1 × 10^0

n = 1 mol

Two common substances that cause a freezing point depression are salt and antifreeze.

Salt is often used to melt ice on roads and sidewalks during the winter. When salt is added to ice, it lowers the freezing point of water, causing the ice to melt at a lower temperature than it would normally. This makes it easier to clear the ice and snow from the ground, making it safer for people to walk and drive on.

Additionally, salt is also used in the food industry to preserve and flavor food. Antifreeze, on the other hand, is used to prevent liquids from freezing in cold temperatures. It is commonly used in cars to prevent the engine coolant from freezing in cold temperatures. Antifreeze works by lowering the freezing point of the liquid, allowing it to remain in a liquid state at lower temperatures than it would normally. This prevents the engine from seizing up and causing damage.

Antifreeze is also used in other industries, such as in HVAC systems, to prevent pipes and other equipment from freezing in cold temperatures. Overall, both salt and antifreeze are important substances that we use in our daily lives that cause a freezing point depression. Without these substances, it would be much more difficult to navigate and survive in colder climates.

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From the samples on the slide made up of tiny cells, Terry can conclude that the cells were produced by other cells.

Cell production occurs often in a human protein, such as yeast, bacteria, or mammalian cells in culture, which then start producing the protein in large quantities. A new organism is created during the process of splicing a gene into a production cell.

Cells are often produced from other cells by the process of replication. All living things, from microorganisms to humans, rely on cells for structure and function. Scientists regard them as the tiniest form of life. Cells contain the biological machinery that produces the proteins, chemicals, and signals that are responsible for everything that occurs within our bodies.

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Reducing benzil can lead to multiple products, and finding the mixture melting point helps in determining the purity of the sample.

A narrow, consistent melting point indicates a pure compound, while a broader, lower melting point suggests a mixture.

To reduce benzil, a chemical reaction is required, typically involving the addition of a reducing agent such as sodium borohydride (\(NaBH_4\)) or lithium aluminium hydride (\(LiAlH_4\)).

The reduction process converts the carbonyl group of benzil into an alcohol or a hydroxyl group.

When multiple products are formed during the reduction of benzil, it is essential to determine the melting point of the mixture to assess its purity.

The melting point of a pure compound is usually sharp, while a mixture of compounds exhibits a broader melting point range, which is generally lower than the melting point of the individual pure components.

To find the mixture melting point, follow these steps:

1. Prepare a small sample of the mixture on a glass capillary tube.

2. Insert the capillary tube into a melting point apparatus.

3. Gradually increase the temperature and observe the temperature range where the mixture starts to melt and completely liquifies.

4. Record the temperature range and compare it to the known melting points of the individual components.

Based on the observed melting point range, you can determine if your sample is a mixture or a pure compound.

If the melting point range is narrow and close to the known value of one of the products, your sample is likely pure.

If the melting point range is broad and lower than the expected values, it suggests that your sample is a mixture of products.

In summary, reducing benzil can lead to multiple products, and finding the mixture melting point helps in determining the purity of the sample.

A narrow, consistent melting point indicates a pure compound, while a broader, lower melting point suggests a mixture.

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