What kind of radioactive element is useful for dating an object?
a. one with a half-life close to the age of the object
b. one that is present in very small amounts
c. one that decays very quickly into a stable form
d. one that does not undergo transmutation

Answer:

1,3 - dimenthylbenzene

Right option is (c).

Explanation:

⠀

⠀

As here in the figure, we can see the hexagonal shape with a circle inside it which depicts the benzene ring. And at 1 and 3 carbon atom, the methyl group is attach to the it.

⠀

It's formula will be

[tex] \sf C_8H_{10}[/tex]

It is also known as m-xylene.

⠀

And this organic compound is used in leather and rubber industries.

Answer:

C and A

Explanation:

i think it is because a solution is a mix of a solute and solvent, dont judge me if its wrong

Answer: 66

Explanation: To find the mass number you would have to add the number of protons and the number of neutrons.

Answer:

The answer is c hope it is right if it is rong please tell me tho :)

The maximum mass of NH₃ that can be formed when 36.52 g of N₂ reacts with 10.62 g of H₂ is 44.35 g

N₂ + 3H₂ —> 2NH₃

Molar mass of N₂ = 14 × 2 = 28 g/mol

Mass of N₂ from the balanced equation = 1 × 28 = 28 g

Molar mass of H₂ = 2 × 1 = 2 g/mol

Mass of H₂ from the balanced equation = 3 × 2 = 6 g

Molar mass of NH₃ = 14 + (3×1) = 17 g/mol

Mass of NH₃ from the balanced equation = 2 × 17 = 34 g

SUMMARY

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂ to produce 34 g of NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

36.52 g of N₂ will react with = (36.52 × 6) / 28 = 7.83 g of H₂

From the above calculation, we can see that only 7.83 g out of 10.62 g of H₂ are required to react completely with 36.52 g of N₂.

Therefore, N₂ is the limiting reactant

From the balanced equation above,

28 g of N₂ reacted to produce 34 g of NH₃

Therefore,

36.52 g of N₂ will react to produce = (36.52 × 34) / 28 = 44.35 g of NH₃

Thus, the maximum mass of NH₃ obtained from the reaction is 44.35 g

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Answer:

The student can evaporate the liquid water.

Explanation:

The student only mixed water with the powdered tea. Therefore, if the water is evaporated from the mixture, the student will be left with the tea mixture only.

Answer:

oxygen reacts with glucose to produce carbon dixiode into water and release energy. It is 1

Explanation:

It is A

Explanation:

The advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.

According to the definition of Bronsted-Lowry, a base is a proton acceptor. In that case, the concept of bases is not limited to only the hydroxide ions.

Thus the advantage of Bronsted-Lowry base theory over the Arrhenius base theory is that the Bronsted-Lowry bases can act as proton acceptors.

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Answer:

254.32

Explanation:

The formula to calculate mass is:

no. of moles ×molar mass. and the molar mass of carbon dioxide is 44

Answer:

Oxygen

Explanation:

One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.

Some of the applications of fission reactions are as follows:

Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.

Nuclear fission involves the release of radioactive particles which causes a decrease in the number of atoms.

Nuclear fission have the following applications in industry:

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Answer:

C

Explanation:

Adding and acid and base together until it is completely neutralized will give us water and a salt.

For example:

HCl + NaOH --> NaCl + H2O

HCl being the acid

NaOH being the base

The H2O is water

The NaCl is the salt

Ion particles are present in water solutions of electrolytes while neutral molecules are present in case of non electrolytes.

Electrolytes are compounds that dissociate into ions when dissolved in a solution, resulting in the solution becoming conductive to electricity. These substances are usually made up of ionic compounds or acids that dissolve in water, producing positively and negatively charged ions. These ions can move freely within the solution and transport electric charge, thereby transforming the solution into a conductor of electricity.

When we talk about water solutions of electrolytes, it's important to note that the solute particles are present in the form of ions. These ions are essentially atoms or molecules that have a net electric charge as a result of gaining or losing electrons. The presence of these charged particles allows for conductivity within the solution, making them capable of carrying an electric charge. Some common examples of electrolytes include table salt (also known as sodium chloride), acids, and bases.

When it comes to solutions in water that contain non-electrolytes, the solute particles are made up of neutral molecules or compounds that lack an overall electric charge and therefore, cannot facilitate electrical conductivity within the solution. Sugar, alcohol, and urea are a few examples of non-electrolytes.

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Answer:

It takes 7 mol H2 to produce 7 mol H2O

Explanation:

In 2H2O, there's 2 moles of H2 for every 1 mol O2.

So, if oxygen is limiting you'd only be able to produce 2 moles of H2O. I don't know if the question implies that, so it could also be that 7 mol H2 makes 7 mol H2O. Sorry for the confusion, I hope it helps a bit

Answer:

Explanation:

The balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.

Combustion reaction is the reaction in which a substance react with oxygen to produce energy and heat. It is an exothermic reaction.

The combustion of biodiesel with oxygen form carbon dioxide and water.

Thus, the  balanced equation for the combustion of biodiesel is CH₄ + 2O₂ = CO₂ + H₂O.

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Answer:

Approximately [tex]0.639\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

Explanation:

Look up the specific heat of water:

[tex]c(\text{water}) = 4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}}[/tex].

It is given that the mass of the water in this calorimeter is:

[tex]m(\text{water}) = 130.0\; {\rm g}[/tex],

The temperature of the water in this calorimeter has increased by:

[tex]\Delta T(\text{water}) = (31.0 - 25.5)\; {\rm K} = 5.5\; {\rm K}[/tex].

Thus, the energy that the water in this calorimeter absorbed would be:

[tex]\begin{aligned}& Q(\text{water})\\ =\; & c(\text{water}) \, m(\text{water}) \, \Delta T(\text{water}) \end{aligned}[/tex].

Let [tex]c(\text{metal})[/tex] denote the specific heat capacity of this piece of metal.

The mass of this piece of metal is:

[tex]m(\text{metal})[/tex].

The temperature of this piece of metal has been reduced by:

[tex]\Delta T(\text{metal}) = (96.0 - 25.5)\; {\rm K} = 70.5\; {\rm K}[/tex].

As this piece of metal cooled down, the energy it released would be:

[tex]\begin{aligned}& Q(\text{metal})\\ =\; & c(\text{metal}) \, m(\text{metal}) \, \Delta T(\text{metal})\end{aligned}[/tex].

Assuming that there is no exchange of energy between contents of this calorimeter and surroundings. By the law of conservation of energy, energy could neither be created nor destroyed.

Since energy could not be destroyed, the water in this calorimeter need to absorb the entirety of the energy that this piece of metal released. At the same, since no energy isn't created, the energy that the water absorbed would need to entirely come from this piece of metal. Therefore:

[tex]Q(\text{metal}) = Q(\text{water})[/tex].

[tex]\begin{aligned}& c(\text{water})\, m(\text{water})\, \Delta T(\text{water}) \\&= c(\text{metal})\, m(\text{metal})\, \Delta T(\text{metal}) \end{aligned}[/tex].

Rearrange and solve this equation for [tex]c(\text{metal})[/tex]:

[tex]\begin{aligned}& c(\text{metal}) \\=\; & \frac{c(\text{water}) \, m(\text{water})\, \Delta T(\text{water})}{m(\text{metal})\, \Delta T(\text{metal})} \\ =\; & \frac{4.18\; {\rm J \cdot g^{-1} \cdot K^{-1}} \times 130.0\; {\rm g} \times (31.0 - 25.5)\; {\rm K}}{72.0\; {\rm g} \times (96.0 - 25.5)\; {\rm K}} \\ \approx\; & 0.639\; {\rm J \cdot g^{-1}\cdot K^{-1}}\end{aligned}[/tex].

The error in the student's reasoning happened as they get confused between the beta minus decay and beta plus decay.

A neutron is converted into a proton in beta minus, increasing the atomic number of the atom.

In the given question beta minus decay is not occur as atomic number of the daughter nuclei does not increases. Rather than this in the given decay atomic mass of the daughter nuclei is less than the parent nuclei means plus beta decay is happened there.

Hence the error is in predicting the correct particle with charge.

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Answer:

Neither Attraction Nor Repulsion

Explanation:

To start off,

Kinetic Molecular Theory:

Repulsion:

Attraction:

To finish,

Gas particles move at random, which means there are no attractive forces between them or in their surroundings. The entire kinetic energy of two particles is preserved when they collide.

Answer:

Neither attraction nor repulsion.

Explanation:

Just took the test!

Answer:

5.12 moles of hydrochloric acid.

Explanation:

The balanced equation is:

2KMnO4 + 16HCl  --->  2KCL + 2MnCl2 + 5Cl2 + 8H2O

So 2 moles of potassium permanganate  reacts with 16 moles of HCl.

So 0.64 moles KMnO4 react with  (16/2) * 0.64

= 5.12 moles.

Answer:

Explanation:

3 Apply Many scientific words, such as table, also have everyday meanings. Use context clues to write your own definition for each meaning of the word table.

Example sentence

The books are on the table

The amount, in grams, of [tex]N_2[/tex] that will be consumed to produce 265 grams of [tex]CaCN_2[/tex] will be 80.61 grams

From the equation of the reaction:

[tex]CaC_2 + N_2 --- > CaCN_2 + C[/tex]

The mole ratio of  [tex]N_2[/tex] consumed to   [tex]CaCN_2[/tex] produced is 1:1.

Mole of 265 grams of  [tex]CaCN_2[/tex] = 265/92.11 = 2.88 moles

Equivalent moles of  [tex]N_2[/tex] = 2.88 moles

Mass of 2.88 moles  [tex]N_2[/tex] = 2.88 x 28.02 = 80.61 grams

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[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Cations are ions that has a positive charge on it, and since it's a positive charge, it means that the ion has more protons than the number of electrons.

On the same contray, Anions are negatively charged particles having more electrons than protons in it, and hence bearing a negative charge.

property : non - alike ions attract each other by electrostatic force.

Answer:

Cations are positively-charged ions.

Anions are negatively-charged ions.

Answer:

Which half-reaction equation represents reduction?

answer is 2

Answer:

B CU2+ +2e- -> Cu

Explanation:

reduction means something opposite of the word

reduction means an electron is GAINED in the part before the arrow

it's the " + 2e- " part of the equation before the arrow or "->" part

oxidation is the LOSING of an electron so it would show up to the right of arrow or "->" of the equation as "+2e-"

both reduction & oxidation reactions are called "redox"

in a battery

anode is oxidation

cathode is reduction

anode is positive

cathode is negative electrode

decomposing compounds is electrolysis.

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Answer:

the first question's answer is 10.7g and the follow up question is 47.7g.

Explanation:

it makes you drag the object onto the scale and then displays it on the green rectangle.

Answer:

The number of protons is 30. Substitute the known values, where N represents the number of neutrons. Let's rewrite the equation as 30+N=65 30 + N = 65 .

Answer:

35 neutrons

Step by step explanation:

Atomic mass of Zinc: 65 amu (atomic mass units)

Number of protons in Zinc: 30

Number of neutrons in Zinc: Atomic mass of Zinc - Number of protons in Zinc = 65-30 = 35 neutrons.

Therefore, zinc atoms have 35 neutrons.

Hope this helps!!!

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Answer:

A. bent

Explanation:

The ΔH fusion used to calculate the energy released when a mass of liquid freezes by using the formula Grams liquid x mol/g x ΔH fusion.

The enthalpy of fusion of a substance, also known as (latent) heat of fusion, is the change in its enthalpy resulting from providing energy, typically heat, to a specific quantity of the substance to change its state from a solid to a liquid, at constant pressure.

Heat of formation or enthalpy is given for any one mole of substance.

And it will be calculated for moles of gases as, so for this first mass will be converted into moles as-

n = W/M, where

W = given mass in grams

M = molar mass in g/mol

and then multiply the given moles by the enthalpy of formation of one mole.

Hence, Grams liquid x mol/g x ΔH fusion is used.

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Answer:

ANSWER

Explanation: