Based on the article “Will the real atomic model please stand up?,” why did J.J. Thomson experiment with cathode ray tubes?

A. to specifically identify the nucleus as a separate part of an atom
B. to determine that electric beams in cathode ray tubes were actually made of particles
C. to prove John Dalton and Democritus wrong
D. to determine the exact energy output of cathode ray tubes

Here are three steps Madison can take to molten manage her debt in the most responsible way possible:1. Create a budget: The first thing Madison should do is create a budget.

Madison should start by listing all of her monthly expenses, including rent, utilities, groceries, transportation, and any debt payments. She should also include her monthly income.2. Prioritize her debt: Madison should prioritize her debt by paying off the debt with the highest interest rate first. This will help her save money in the long run by reducing the amount of interest she has to pay. Madison should also consider consolidating her debt to simplify her payments and potentially lower her interest rates.

Madison should prioritize her debt by paying off the debt with the highest interest rate first. This will help her save money in the long run by reducing the amount of interest she has to pay. Madison should also consider consolidating her debt to simplify her payments and potentially lower her interest rates.3. Build an emergency fund: Finally, Madison should build an emergency fund. This will help her avoid relying on credit cards or other forms of debt in case of unexpected expenses, such as a car repair or medical bill. Madison should aim to save at least three to six months’ worth of expenses in her emergency fund.

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An ionic compound's name and formula always place the cation before the anion.

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The order of activity from most active to least active in the given scenario is: zinc, iron, lead. This is because zinc is the most active element in the group, as it has the least number of valence electrons.

making it more likely to participate in chemical reactions and replace other elements. Iron is the next most active, as it has a higher number of valence electrons than zinc, but still fewer than lead, which is the least active element in the group due to its high number of valence electrons, making it less likely to participate in chemical reactions and replace other elements.A chemical element with the atomic number 30 and the symbol Zn is zinc (Zn). It belongs to the periodic table's group 12 and is a transition metal. A bluish-white, glossy metal with high conductivity for electricity, zinc is a substance. It reacts with oxygen and water to produce zinc oxide (ZnO) and zinc hydroxide (Zn(OH)2) due to its comparatively high reactivity. Brass manufacture, galvanizing (coating steel or iron to prevent corrosion), and alloying other metals all utilize it often.

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The reaction has a heat of 161.1 kJ/mol.

If 250 mL of a NaOH solution contain 1 milligrams of NaOH, the solution's molarity is 10-4 M. The amount of solute in 1 litre of solution is known as the molarity.

We can use the following formula to get the reaction's heat:

Q = m × c × ΔT

The total volume of the mixture is 500.0 mL because we are aware that the volume of each solution is 250.0 mL:

m = V × ρ

m = 500.0 mL × 1.025 g/mL

m = 512.5 g

The change in temperature must then be calculated:

ΔT = (48.8°C - 2.0°C) = 46.8°C

Assuming that the acid used is HCl and the base used is NaOH, their molar masses are:

HCl: 1 mol of HCl = 36.46 g/mol

NaOH: 1 mol of NaOH = 40.00 g/mol

The reaction between HCl and NaOH has the following chemical formula:

HCl + NaOH → NaCl + H2O

As can be seen, the reaction's stoichiometry is 1:1, which means that 1 mole of HCl combines with 1 mole of NaOH.

So, the following formula can be used to determine the reaction's heat:

Q = m × c × ΔT

Q = 512.5 g × 4.190 J/goC × 46.8°C

Q = 100,697 J or 100.697 kJ

Since both solutions have a 2.500 M molarity, the number of moles of either HCl or NaOH can be determined as follows:

moles = M × V

moles = 2.500 mol/L × 0.2500 L

moles = 0.6250 mol

Therefore, the heat of the reaction is:

Q/mol = Q / moles

Q/mol = 100.697 kJ / 0.6250 mol

Q/mol = 161.1 kJ/mol

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Answer: B is the answer

Explanation:I just answered

Answer:

4.67 moles of Li2SO3 dissolved to make 2.04 liters of solution. 4.67 mol ... water. In the second solution, I use 1.0 mole of salt to make a 1.0 L solution. Do the two ... How many milliliters are needed to make. 100.0 mL of ... 4. If I add 25 mL of water to 125 mL of a 0.15 M Naoh solution, what will the molarity of the diluted ...

Explanation:

Here are three equations representing the chemical reaction between a metal and an acid:

Zinc + 2HCl → ZnCl2 + H2

Iron + 2HNO3 → Fe(NO3)2 + H2O + NO

Magnesium + 2H2SO4 → MgSO4 + 2H2O + SO2

The three equations representing the reaction :

In this reaction, zinc (metal) reacts with hydrochloric acid to form zinc chloride and hydrogen gas.

In this reaction, iron (metal) reacts with nitric acid to form iron(II) nitrate, water, and nitric oxide.

In this reaction, magnesium (metal) reacts with sulfuric acid to form magnesium sulfate, water, and sulfur dioxide.

In each of these equations, the metal reacts with the acid to produce a salt, water, and sometimes additional products such as hydrogen gas (H2), nitrogen dioxide (NO2), nitrogen monoxide (NO), or sulfur dioxide (SO2), depending on the specific acid and reaction conditions.

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Answer:

1. Age

2. Time

3. Same Puzzle

Explanation: Independent variable are what changes in the experiment and allow you to get a result. Dependent variables measure what you are trying to find from an experiment. Constants are what remain the same throughout all trials.

ANSWER

option D

EXPLANATION

When a full bag of trash is placed in a compactor, the compactor will compress the bag so as to allow more trash to fill in. This is done by increasing the capacity of the trash.

Therefore, the volume of the trash bag will changed

Hence, the correct answer is option D

The amount of solid zinc (Zn) formed if 3642 coulombs of charge are passed through a solution of zn2 ions would be 0.00763 g which can be calculated using Faraday's law of electrolysis.

The amount of solid zinc (Zn) formed can be calculated using Faraday's law of electrolysis, which relates the amount of substance produced at an electrode to the quantity of electric charge passed through the electrode.

The formula for Faraday's law is:

moles of substance = (electric charge passed) / (Faraday's constant * charge on one mole of electrons)

The Faraday's constant is the electric charge carried by one mole of electrons, which is 96,485 C/mol. The charge on one mole of electrons is the elementary charge, which is 1.602 x 10^-19 C.

The balanced chemical equation for the electrolysis of Zn2+ ions is:

Zn2+ (aq) + 2e- → Zn (s)

From the equation, we can see that 2 moles of electrons are required to produce 1 mole of solid zinc.

First, we need to calculate the number of moles of electrons passed through the solution:

number of moles of electrons = electric charge passed / elementary charge

number of moles of electrons = 3642 C / 1.602 x 10^-19 C/electron

number of moles of electrons = 2.27 x 10^22 electrons

Next, we can use Faraday's law to calculate the moles of solid zinc formed:

moles of Zn = number of moles of electrons / (Faraday's constant * 2)

moles of Zn = 2.27 x 10^22 electrons / (96,485 C/mol * 2)

moles of Zn = 1.17 x 10^-4 mol

Finally, we can use the molar mass of zinc (65.38 g/mol) to calculate the mass of solid zinc formed:

mass of Zn = moles of Zn * molar mass of Zn

mass of Zn = 1.17 x 10^-4 mol * 65.38 g/mol

mass of Zn = 0.00763 g

Therefore, 0.00763 g of solid zinc would be formed when 3642 coulombs of charge are passed through a solution of Zn2+ ions.

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Answer:

2.468 g of Zn will be formed if 3642 coulombs of charge passed through a solution of \(Zn^2^+\) ions

Explanation:

Given that , a charge of 3642 Coulombs is passed through a solution of \(Zn^2^+\) ions

We know that , The balanced equation for the reduction  of \(Zn^2^+\) ions to Zn metal is

\(Zn^2^+\) + 2e → Zn

This equation tells us that for every 1 mole of \(Zn^2^+\) ions that are reduced, 2 moles of electrons are required.

We also know that 1 mole of electrons has a charge of 96,485 coulombs. Therefore, we can calculate the number of moles of \(Zn^2^+\) ions that can be reduced by 3642 coulombs of charge as follows

Number of moles  of \(Zn^2^+\) ions  =  Actual charge passed through the solution / Charge of 1 mole of electron

By replacing the value give in the question we get ,

Number of moles  of \(Zn^2^+\) ions = 3642 coulombs / (96,485 coulombs/mol) = 0.0378 mol

We also know that ,

Mass = Number of moles * Molar Mass

The molar mass of Zn is 65.38 g/mol.

Therefore, the mass of 0.0378 moles of Zn will be:

Mass of Zn = 0.0378 mol * 65.38 g/mol = 2.468 g

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Answer:

C) Aging

Explanation:

You can't stop that or change the rate that you age at. its inevetable :D

This is kind of a vague question as there is so many ways to have chemical reactions but here is a few: formation of precipitate, change in the state, a change in the temperature, a evolution of gas and change in color.

So your answer would be around 5 maybe more.

According to the question the element undergoing oxidation is nitrogen (N).

Oxidation is a chemical reaction that involves the loss of electrons from an atom, molecule, or ion. This process creates an oxidized version of the original molecule or ion, which can often be identified by a change in color or smell. Oxidation reactions can occur in both organic and inorganic molecules. Examples of oxidation include the rusting of iron and the browning of an apple when exposed to air. Oxidation often results in the release of energy, which can be harnessed for various applications.

This is because it is gaining oxygen (O) atoms in the reaction. The element undergoing reduction is oxygen (O). This is because it is losing electrons (in the form of oxygen atoms) in the reaction.

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Energy from the sun promotes condensation, which in turn creates winds.

Water vapor turns into liquid through a process called condensation. Either the air cools to its air temperature or it gets so dissolves in water that it is no longer hold any more water, which leads to condensation. Dry Point

Condensation happens when warm air bumps into cold surfaces or when your environment is very humid. When this moist warm air strikes a chilly area, it swiftly cools down and sheds the water, which condenses into liquid on the chilly surface.

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Observations are a vital part of science. An observation is a report of something detected using one or more of the five senses. Sight, touch, taste, smell, and hearing are the five senses.Observations must be correct, concise, objective, and understandable.

The following are some of the examples of different observations and their explanation: Observation #1: There is a gas leak in the kitchen, and after 10 minutes, you smell gas in the bedroom.Explanation: When there is a gas leak in the kitchen, the gas begins to diffuse. When there is a high concentration of gas in the kitchen, it is detected. However, the gas continues to diffuse into the atmosphere and spreads to other regions. The gas spreads to the bedroom, resulting in a strong scent of gas.Observation #2: When person applies perfume in one corner of the room, you can smell its fragrance in another room.Explanation: When the person applies perfume in one corner of the room, the aroma begins to diffuse. The scent of the perfume quickly spreads into the atmosphere and mixes with the air molecules.As a result, the scent of the perfume spreads to other rooms in the house.Observation #3: When a small hole is made in the top of a coke bottle, the carbon dioxide gas moves out of the bottle over time. Explanation: When a small hole is made in the top of a coke bottle, carbon dioxide gas begins to diffuse out of the bottle. Carbon dioxide molecules move from the region of high concentration inside the bottle to the region of low concentration outside the bottle.

Carbon dioxide will move out of the bottle over time as a result of this process.Observation #4: If the tightly packed food is placed in the kitchen for a long time, then you can smell the gas as it penetrates through the small holes in the plastic.Explanation: Plastic wrap contains tiny holes that allow air and gases to pass through. When food is stored in plastic wrap,gases generated by the food will diffuse through the plastic wrap's small holes. As a result, gas is present in the kitchen.

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The solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

The solubility product denoted as Ks, of an ionic compound is defined as the product of the concentration of the ions that exist in equilibrium with the solid compound in a saturated solution.

The balanced chemical equation is given as,

Ag₂CrO₄ ⇌ 2Ag⁺ + CrO₄²⁻

Thus,

[Ag⁺] = 2 [CrO₄²⁻]

By using the formula of Ksp we get,

Ksp = [Ag⁺] [CrO₄²⁻]

⇒ Ksp =  2 [CrO₄²⁻]  [CrO₄²⁻]

⇒ Ksp = 2 [CrO₄²⁻]²

Substituting the values of Ksp we get,

2.76 x 10⁻¹² = 2 [CrO₄²⁻]²

⇒ [CrO₄²⁻]² = 2.76 x 10⁻¹² /2

⇒ [CrO₄²⁻]² = 1.38  x 10⁻¹²

⇒ [CrO₄²⁻] = 1.17  x 10⁻¹²

Hence, the solubility product of the chromate ion (CrO₄²⁻) is 1.17  x 10⁻¹² .

​

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Answer:

Percent yield = 7.1%

Explanation:

The general reaction of the problem is:

Ca(OH)₂ + CO₂ → H₂O + CaCO₃

To solve this question we need to find theoretical yield using the amount of carbon dioxide added because:

Percent yield = Actual yield (3.22g) / Theoretical yield * 100

Theoretical yield is the maximum amount of product that could be obtained. To find it we need to convert the mass of CO₂ to moles. The moles of CO₂ = Moles of CaCO₃:

Moles CO₂ -Molar mass: 44.01g/mol):

20.0g * (1mol / 44.01g) = 0.454 moles CO₂ = Moles of CaCO₃ produced

Mass CaCO₃ = Theoretical yield -Molar mass: 100.09g/mol-:

0.454 moles * (100.09g / mol) = 45.5g of CaCO₃ = Theoretical yield.

Replacing:

Percent yield = 3.22g / 45.5g * 100

Answer:

elements in the same period have the same number of shells

the period number the element is in, that is the number of shells it has.

Answer:

true

Explanation:

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An acid is hydrogen and one or more nonmetals. This statement is true. Therefore, option A is correct.

A nonmetal is a chemical element that typically doesn't have a lot of metallic characteristics; examples include colourless vapors and glossy solids. When compared to metals, nonmetals' electrons exhibit different behaviour.

Natural substances known as non-metals are brittle and thermally and electrically inert (can not be easily rolling, moulding, extruding or pressing). The non-metallic elements in the periodic table are hydrogen, carbon, nitrogen, oxygen, phosphorus, arsenic, and selenium.

Non-metals are substances that lack luster, sonority, ductility, malleability, and are poor conductors of heat and electricity. They are soft and dull in appearance. Take oxygen, hydrogen, sulphur, etc. as examples.

Thus, option A is correct.

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Answer:

4 days.

To calculate half life divide original value by 2.

1.2 ÷ 2 = 0.6 grams

0.6 minutes was a half life of new isotope.

A radioisotope is an unstable form of chemical element date releases radiation is it breakdowns and becomes more stable so, radioisotopes may occur in nature or it will be made in a laboratory also.

Uses of radioisotopes:

It is used in cancer treatment, food irradiation, gauges and radiography.

The time required for half of something to undergo a process such is the time required for half of the items of radioactive substance to become disintegrated.

Half life is the time taken for the radioactive of a substance to phone to half its original values where is mean life is average lifetime of all the nuclei of a particular unstable atomic species.

Radioactive element has a half life of one hour this means that half of it will decay in one hour after another hour half of the remaining material will decay.

Half life of the new isotope is 1.2/2 = 0.6 minutes

0.6 minutes was a half life of new isotope.

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Answer:

True

Explanation:

True definition of a mixture itself

The empirical formula of the compound is C4H7O while the molecular formula is C12H21O3.

The empirical formula is the simplest formula of the compound. From the data provided;

Mass of moles of Carbon= 32.065 g/44g/mol * 12/1 = 8.75 g

Number of moles of carbon =  8.75 g/12 g/mol = 0.73 moles

Mass of hydrogen = 11.485 g/18 g/mol * 2 = 1.32 g

Number of moles of hydrogen = 1.32 g/1 g/mol = 1.32 moles

Mass of oxygen =  12.95 g - [8.75 g + 1.32 g] = 2.88 g

Numer of moles of oxygen = 2.88 g/16 g/mol = 0.18 moles

Divide through by the lowest ratio;

C -  0.73 /0.18       H -  1.32 /0.18       O -   0.18 /0.18

C- 4          H - 7      O -1

The empirical formula is C4H7O

The molecular formula is obtained from;

[4(12) + 7(1) + 16]n = 213.29

n = 213.29/71

n =3

C12H21O3

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Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles N2, or 28.0134 grams.

Explanation:

:)

Answer: bread baking in a oven and water evaporating in a puddle

Explanation:

Answer:The formula is

Explanation:

SO2

\

Answer:

SO2

Explanation:

Sulfur had no prefix so I'm this case it is one

and oxygen has a prefix of di, which means 2.

so sulfur(1) Oxygen(2)

The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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Explanation:

ok so I believe:

a. increase in atomic radii going down a group and decrease going across a period.

b. increase in IE1 going across a period and up a group. the highest IE1 elements are like He, Ne, F and first ionization energy decreases moving further away from those elements moving south west on the periodic table.

c. electron affinity increases moving across a period left to right.

d. ionic radii increases going down a group and decreases going across a period left to right

e. electronegativity increases across a period but decreases down a group. (opposite for electropositivity)

what is meant by the d-block elements? are you referring to the spdf location?

Answer: the required energy is \(4.42 * 10x^{-19} J\)

Explanation:

the energy of a photon is given by the formula

Given that Temperature T = 1500 K

and the  Wavelength is =4.45 × 10^2 nm

Answer:

molarity

Explanation: