Which words help you to determine the meaning of the word declerate in paragraph 3 ?

Answer:

Because they cannot be separated into more then one type of substance.

Explanation:

Answer:

Elements are made of only one kind of atom. The particles can be a single atom or a molecule made of only one kind of atom. There is no physical change that can separate elements into more than one kind of substance. This makes an element a pure substance.An element is made up of only one type of atom. An element cannot be broken down into a simpler form.

The mass of chromium that could be deposited by electrolysis of an aqueous solution of Cr2(SO4)3 for 155 min using a constant current of 10.0 A is approximately X grams.

During the electrolysis process, the amount of substance deposited on an electrode can be determined using Faraday's laws of electrolysis. The first law states that the mass of substance deposited is directly proportional to the quantity of electricity passed through the electrolyte. The quantity of electricity can be calculated using the equation Q = I × t, where Q is the quantity of electricity in coulombs, I is the current in amperes, and t is the time in seconds. Since the current is given as 10.0 A and the time is 155 min (or 9300 s), we can calculate Q as Q = 10.0 A × 9300 s.

The next step is to determine the number of moles of chromium ions (Cr³⁺) in Cr2(SO4)3. Cr2(SO4)3 contains 2 moles of chromium ions per formula unit. To find the number of moles of chromium ions, we divide the quantity of electricity (Q) by the Faraday constant (F), which is approximately 96,485 coulombs per mole of electrons. Thus, the number of moles of chromium ions is Q / F.

Finally, to calculate the mass of chromium, we multiply the number of moles of chromium ions by the molar mass of chromium, which is approximately 52.0 g/mol. Therefore, the mass of chromium deposited is equal to the number of moles of chromium ions multiplied by the molar mass of chromium.

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Answer:

it would have sound a

thermal .why a train needs coal and coal get burned by heat that is thermal energy and sound beacuse a train makes sound by moving

Explanation:

have a good day /night

may i please have a branlliest

The bond energy is the energy that must be supplied to break the bond. Ionic substances are held together by strong bonds.

This question is incomplete but I will try to explain what is meant by average bond energy as the tables are missing.

The average bond energy of a bond simply means the energy that is stored in that bond as it holds two atoms together. It is equal to the energy that must be supplied to break the bond. The numerical value of the bond energy can not be deduced as the data is missing.

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Answer:

Gibbs equation helps us to predict the spontaneity of reaction on the basis of enthalpy and entropy values directly. When the reaction is exothermic, enthalpy of the system is negative making Gibbs free energy negative. Hence, we can say that all exothermic reactions are spontaneous.

Answer:

The correct option is 2) When electrons are shared unevenly among the atoms in a compound

Explanation:

Polarity is the property of a molecule in which the atoms share electrons in an uneven way. This is due to differences in the electronegativity of the atoms. The atom with a higher electronegativity will attract with a higher strength the electrons. Thus, a separation of charges is produced: the atom with more electrons has a more negative charge while the atom with fewer electrons has a more positive charge. This charge separation generates a dipolar moment, which means: polarity.

Electrical energy is changed into mechanical energy which takes place when the cook uses the blender. So, the correct option is B.

Electrical energy is defined as the energy related to the forces on electrically-charged particles and the motion of those particles whose energy is supplied by a combination of current and electric potential that is delivered by a circuit.

Electrical energy is present all around us in many different forms, where some of the best examples of electrical energy are using car battery electrical energy in electrical systems, wall outlet to transfer electrical energy to charge our phones, and our muscles that uses electrical energy to contract and relax. Electrical energy is changed into mechanical energy which takes place when the cook uses the blender.

Therefore, the correct option is B.

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According to the question isotope X is 214Bi, and alpha decay occurs.

An isotope is a form of an element that has the same number of protons but a different number of neutrons. Isotopes have the same atomic number and are chemically identical, but the number of neutrons in the nucleus can vary, resulting in different masses or weights. Isotopes can be either stable or unstable and can be used for a number of applications, from medical treatments to energy production. Stable isotopes are found naturally in the environment, while unstable isotopes must be created in a laboratory. Stable isotopes are used for a variety of purposes including dating objects, tracing the movement of elements, and analyzing the diet and migration patterns of animals. Unstable isotopes are used in the field of nuclear medicine and in the production of energy through nuclear power plants. Isotopes are also used in many industries and research labs to study the physical, chemical, and biological properties of elements.

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The law of definite proportions state atoms combine in whole number ratios. Therefore, option B is correct.

According to the rule of definite proportions, every chemical compound has the same elements in the exact same mass quantities.

According to the law of definite proportions, sometimes referred to as the law of constant proportions, each of the constituent components of a chemical compound must always be present in a certain ratio in terms of their mass.

According to the law of definite proportion, the mass ratio of the components in compounds is constant. As an illustration, water from various bodies of water will still have 11% hydrogen and 89% oxygen.

Thus, option B is correct.

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The frequency of the infrared wave at the given speed and wavelength is \(5.5 \times 10^{13} \ Hz\).

The given parameters;

The frequency of the infrared wave is calculated by using wave equation as shown below;

v = fλ

where;

\(f = \frac{v}{\lambda} \\\\f = \frac{3\times 10^8}{5.5 \times 10^{-6}} \\\\f = 5.5 \times 10^{13} \ Hz\)

Thus, the frequency of the infrared wave at the given speed and wavelength is \(5.5 \times 10^{13} \ Hz\).

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The water needs to be kept stirred during the experiment to ensure uniform and consistent heat transfer to the stearic acid.

Stirring the water helps distribute the heat evenly throughout the water bath. This prevents any localized temperature variations that could affect the accuracy of the recorded melting point of the stearic acid.

By keeping the water stirred, the heat is uniformly transferred to the stearic acid sample, promoting a more reliable and accurate determination of its melting point. Without stirring, there could be variations in temperature within the water bath.

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Answer:

2.104 L fuel

Explanation:

Given that:

Volume of water = 35 L = 35 × 10³ mL

initial temperature of water = 25.0 ° C

The amount of heat needed to boil water at this temperature can be calculated by using the formula:

\(q_{boiling} = mc \Delta T\)

where

specific heat   of water c= 4.18 J/g° C

\(q_{boiling} = 35 \times 10^{3} \times \dfrac{1.00 \ g}{1 \ mL} \times 4.18 \ J/g^0 C \times (100 - 25)^0 C\)

\(q_{boiling} = 10.9725 \times 10^6 \ J\)

Also; Assume that the fuel has an average formula of C7 H16 and 15% of the heat generated from combustion goes to heat the water;

thus the heat of combustion can be determined via the expression

\(q_{combustion} =- \dfrac{q_{boiling}}{0.15}\)

\(q_{combustion} =- \dfrac{10.9725 \times 10^6 J}{0.15}\)

\(q_{combustion} = -7.315 \times 10^{7} \ J\)

\(q_{combustion} = -7.315 \times 10^{4} \ kJ\)

For heptane; the equation for its combustion reaction can be written as:

\(C_7H_{16} + 11O_{2(g)} -----> 7CO_{2(g)}+ 8H_2O_{(g)}\)

The standard enthalpies of the  products and the reactants are:

\(\Delta H _f \ CO_{2(g)} = -393.5 kJ/mol\)

\(\Delta H _f \ H_2O_{(g)} = -242 kJ/mol\)

\(\Delta H _f \ C_7H_{16 }_{(g)} = -224.4 kJ/mol\)

\(\Delta H _f \ O_{2{(g)}} = 0 kJ/mol\)

Therefore; the standard enthalpy for this combustion reaction is:

\(\Delta H ^0= \sum n_p\Delta H^0_{f(products)}- \sum n_r\Delta H^0_{f(reactants)}\)

\(\Delta H^0 =( 7 \ mol ( -393.5 \ kJ/mol) + 8 \ mol (-242 \ kJ/mol) -1 \ mol( -224.4 \ kJ/mol) - 11 \ mol (0 \ kJ/mol))\)

\(\Delta H^0 = (-2754.5 \ \ kJ - 1936 \ \ kJ+224.4 \ \ kJ+0 \ \ kJ)\)

\(\Delta H^0 = -4466.1 \ kJ\)

This simply implies that the amount of heat released from 1 mol of C7H16 = 4466.1 kJ

However the number of moles of fuel required to burn \(7.315 \times 10^{4} \ kJ\) heat released is:

\(n_{fuel} = \dfrac{q}{\Delta \ H^0}\)

\(n_{fuel} = \dfrac{-7.315 \times 10^{4} \ kJ}{-4466.1 \ kJ}\)

\(n_{fuel} = 16.38 \ mol \ of \ C_7 H_{16\)

Since number of moles = mass/molar mass

The  mass of the fuel is:

\(m_{fuel } = 16.38 mol \times 100.198 \ g/mol}\)

\(m_{fuel } = 1.641 \times 10^{3} \ g\)

Given that the density of the fuel is = 0.78 g/mL

and we know that :

density = mass/volume

therefore making volume the subject of the formula in order to determine the volume of the fuel ; we have

volume of the fuel = mass of the fuel / density of the fuel

volume of the fuel = \(\dfrac{1.641 \times 10^3 \ g }{0.78 g/mL} \times \dfrac{L}{10^3 \ mL}\)

volume of the fuel  = 2.104 L fuel

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 5 × 200

We have the final answer as

Hope this helps you

To form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

The compound Al2O3, commonly known as aluminum oxide, is formed when two aluminum atoms and three oxygen atoms bond. To determine the number of total electrons that must be transferred to form one formula unit of Al2O3, we first need to find the number of electrons that are present in one formula unit of Al2O3.

Aluminum has an atomic number of 13, which means it has 13 protons and 13 electrons in a neutral atom. Each aluminum atom in Al2O3 contributes 3 electrons, and since there are two aluminum atoms in one formula unit of Al2O3, the total number of electrons contributed by aluminum atoms is 6.

Oxygen has an atomic number of 8, which means it has 8 protons and 8 electrons in a neutral atom. Each oxygen atom in Al2O3 contributes 2 electrons, and since there are three oxygen atoms in one formula unit of Al2O3, the total number of electrons contributed by oxygen atoms is 6.

Therefore, to form one formula unit of Al2O3, a total of 12 electrons (6 from aluminum and 6 from oxygen) must be transferred.

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Answer:

The answer is false

It is safe to heat flammable liquids with a hot plate as long as it’s done in a fume hood. The above statement is false.

A flammable liquid is one with a flash point at or below the nominal threshold temperatures specified by a variety of national and worldwide standards organizations. This means that it can easily ignite in air at room temperature.

Acetone, biodiesel, diesel, ethanol, and gasoline are just a few examples of flammable liquids. Strict storage regulations must be followed since the fumes of these substances rapidly catch fire and burn. These liquids are even further divided into groups based on their flash points or boiling points, and it is from these groups that safe handling and storage procedures are determined. It is not safe to heat flammable liquids with a hot plate as long as it’s done in a fume hood.

Therefore, the given statement is false.

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Answer:

50W

Explanation:

The formula and is

W = F × s

(force x distance)

W= 50 N× 5 m =250 N m=250 J

Done in 5 seconds the power is

p

=

W

t

where

t

=time

p

=

250

J

5

=

50 J

/s

=50 W

Answer:

Maybe 250 newtons

Explanation:

The lewis electron-dot diagram which represents the bonding in potassium iodide, KI is give in image attached.

The correct answer choice is option 1.

The lewis structure can simply be defined as those diagrammatic chemical representations which describes the bonding between atoms in a particular molecular structure of a chemical substance. From the context of the above given task, the structure is bonded by eight different electrons.

The importance of lewis electron-dot structures cannot be overemphasized. Some of its significances are as follows:

In conclusion, we can now confirm from the explanation given above that potassium iodide is solid chemical compound.

The complete image of the options of the question is also attached.

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The quenching of proflavine fluorescence may vary with the concentration of different salts because they can interact differently with the proflavine molecule.

Some salts may form complexes with proflavine, which could quench its fluorescence more effectively, while others may not have a significant effect.

The most effective salt in quenching proflavine fluorescence would depend on the specific concentration range and type of salts being tested.

However, in general, salts that have a higher charge density or form stronger ionic interactions with the proflavine molecule may be more effective in quenching. For example, divalent or trivalent salts like calcium or aluminum may be more effective than monovalent salts like sodium or potassium.

The least effective salt in quenching proflavine fluorescence would likely be one that does not interact significantly with the proflavine molecule, such as an uncharged salt like glucose or sucrose.

The different effects of various salts on proflavine fluorescence quenching could be due to differences in their chemical properties, such as their charge density, size, and ability to form ionic interactions with the proflavine molecule.

Some salts may also interact more strongly with water molecules, which could affect the solvation of the proflavine molecule and its fluorescence properties.

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Answer:

A = 3.16

B = 1.31

C = 0.93

Explanation:

Answer

%Yield = 87.2%

Explanation

Given:

mass of NH3 reacted = 73 g

mass of H2O produced = 101 g

We know:

molar mass of NH3 = 17,031 g/mol

molar mass of water = 18.01528 g/mol

Required: % Yield

Solution:

The formula used to calculate the percentage yield is:

%Yield = (actual yield/theoretical yield) x 100

The actual yield of H2O produced = 101 g

Now lets calculate the theoretical yield first.

First find the number of moles of NH3, and use stoichiometry to find the theoretical mass of water.

n = m/M n is the moles, m is the mass and M is the molar mass.

n = 73/17,031 g/mol

n = 4.29 mol

Using the stoichiometry, there molar ratio between NH3 and H2O is 4:6

Therefore the moles of H2O = 4.29 x (6/4)

n of H2O = 6.43 mol

The theoretical mass can then be calculated:

m = n x M

m = 6.43 mol x 18.01528 g/mol

m = 115.83 g

%Yield = (101 g/115.83)*100

%Yield = 87.2%

Answer: Near the Protons. The electron structure of bromine is illustrated above. In chemical reactions, how does the valence configuration of Bromine tend to change? ... It loses one electron.

Explanation:

btw i found that on google lol

Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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Answer: The correct option is, (B) 12.3 KJ

Solution :

First we have to calculate the moles of water.

Now we have to calculate the amount of heat released.

Formula used :

where,

q = heat released

n = number of moles = 2.04 mole

= molar enthalpy of fusion of a substance = -6.01 KJ/mole

Now put all the give values in the above formula, we get the amount of heat released.

The negative sign indicate heat released.

Therefore, the amount of heat released is, 12.3 KJ

The number of moles of gas in the sample of air is approximately 0.148 mol. Here is how to solve the problem Convert the temperature of 50.0°C to Kelvin:50.0°C + 273 = 323 K2. Use the ideal gas law, PV = nRT, to calculate the number of moles of gas

n = PV/RTwhere P is the pressure in atm, V is the volume in liters, R is the gas constant (0.08206 L·atm/K·mol), and T is the temperature in Kelvin.n = (3.60 atm)(1.00 L)/(0.08206 L·atm/K·mol)(323 K)≈ 0.148 molTherefore, the number of moles of gas in the sample of air is approximately 0.148 mol. The given problem can be solved using the ideal gas law which relates the pressure (P), volume (V), number of moles of gas (n) and temperature (T) of a gas.

The ideal gas law equation is: PV = nRTwhere P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the universal gas constant (0.08206 L·atm/K·mol) and T is the temperature of the gas in Kelvin (K).Step 1: Convert the temperature from Celsius to KelvinThe given temperature is 50.0°C. We need to convert this temperature to Kelvin by adding 273.15 to the Celsius temperature.50.0°C + 273.15 = 323.15 KStep 2: Substitute the values into the ideal gas law equation The volume of the gas (V) is given as 1.00 L. The pressure (P) is given as 3.60 atm .Substituting these values and the gas constant (R = 0.08206 L·atm/K·mol) and the temperature (T = 323.15 K) into the ideal gas law equation, we get:n = (P × V)/(R × T)n = (3.60 atm × 1.00 L)/(0.08206 L·atm/K·mol × 323.15 K)n = 0.148 mol Therefore, the number of moles of gas in the sample of air is approximately 0.148 mol.

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This scientific project aims to analyze and implement strategies to rejuvenate a dying lawn, ensuring its vitality and health.

If you notice that a lawn looks unhealthy and the grass is dying, you can undertake a scientific project to save it by following these steps:

Step 1: Identify the problemThe first step is to identify the problem. Observe the lawn and try to determine what is causing the grass to die. Common causes include poor soil quality, lack of water, too much sun or shade, pests, or disease.

Step 2: ResearchOnce you have identified the problem, conduct research to find out more about it. Look for information about how to treat the specific problem that is causing the grass to die. You can consult gardening books or online resources.

Step 3: Develop a hypothesisBased on your research, develop a hypothesis about what is causing the problem. For example, if you think the soil quality is poor, your hypothesis might be that adding fertilizer will improve the health of the grass.

Step 4: Design an experimentDesign an experiment to test your hypothesis. For example, if your hypothesis is that adding fertilizer will improve the health of the grass, you could divide the lawn into two sections. Apply fertilizer to one section and not the other. Record your observations over time to see if the grass in the fertilized section is healthier.

Step 5: Conduct the experiment , Carry out your experiment, making sure to record your observations.

Step 6: Analyze the data Analyze your data and determine whether your hypothesis was correct. If the grass in the fertilized section is healthier than the grass in the section without fertilizer, your hypothesis was correct.

Step 7: Draw a conclusion Based on your analysis, draw a conclusion about what is causing the problem and how it can be fixed. For example, if your experiment showed that adding fertilizer improved the health of the grass, you could conclude that the soil quality is poor and that fertilizing the lawn will help to improve it.

Step 8: Take action Based on your conclusion, take action to fix the problem. In this case, you would apply fertilizer to the entire lawn to improve its health.

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Answer:

Option C

Explanation:

The new method must support the law of definite proportions which means that if one mole of compound is distributed percentage wise then the sum of % share of each element must be equal to one mole of compound and this percentage distribution always remains the same in all conditions

Hence, option C is correct