Anyone know about this ?

The correct answer is A.

The nuclear equation that correctly characterizes a nuclear reaction is one where the sum of the atomic numbers and the sum of the mass numbers on both sides of the equation are equal.

\(_{92}^{235}\textrm{U}+_{0}^{1}\textrm{n}\rightarrow _{54}^{140}\textrm{Xe}+_{38}^{94}\textrm{Sr}+3_{0}^{1}\textrm{n}\)

         \(_{92}^{235}\textrm{U}+_{0}^{1}\textrm{n}\rightarrow _{54}^{140}\textrm{Xe}+_{38}^{94}\textrm{Sr}+3_{0}^{1}\textrm{n}\)

The correct answer is A.

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If 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

The volume of a gas at STP can be calculated using the direct proportion method.

According to this question, 50.75 g of a gas occupies 10.0 L at STP, then 129.3g of the same gas will occupy the following:

= 129.3 × 10/50.75

= 25.48L

Therefore, if 50.75 g of a gas occupies 10.0 L at STP, 129.3 g of the gas will occupy 25.48 L at STP.

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When 2.0 moles of KCIO3 decompose, 2.0 moles of O2 will form.

The balanced chemical equation shows that 2 moles of KCIO3 decompose to produce 3 moles of O2. Therefore, we can use the stoichiometric ratio from the balanced equation to determine the number of moles of O2 formed when 2.0 moles of KCIO3 decompose.

According to the stoichiometry, 2 moles of KCIO3 produce 3 moles of O2. Therefore, we can set up a proportion:

(2 moles KCIO3 / 2 moles O2) = (2.0 moles KCIO3 / x moles O2),

where x represents the unknown number of moles of O2 formed.

Simplifying the equation:

(2 moles KCIO3 / 2 moles O2) = (2.0 moles KCIO3 / x moles O2),

1 = (2.0 moles KCIO3 / x moles O2),

Cross-multiplying:

x moles O2 = (2.0 moles KCIO3 / 1),

x moles O2 = 2.0 moles KCIO3.

Therefore, when 2.0 moles of KCIO3 decompose, 2.0 moles of O2 will form.

It is important to note that this calculation assumes complete and ideal conditions, where the reaction proceeds with 100% efficiency. In reality, the actual yield of O2 may be lower due to various factors such as side reactions or incomplete decomposition. To determine the actual yield, additional information or experimental data would be required.

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Answer:

a hydrogen bond between the hydrogen of water and the nitrogen of the amine

a hydrogen bond between the oxygen of water and a hydrogen from the -NH2 group

Explanation:

A hydrogen bond is formed between molecules in which hydrogen is bonded to a highly electronegative element.

In amines, hydrogen is bonded to nitrogen while in water, hydrogen is bonded to oxygen. Both are highly electronegative elements hence hydrogen bonding is possible between amines and water.

This hydrogen bond may involve;

The hydrogen of water and the nitrogen of the amine

Or

The oxygen of water and a hydrogen from the -NH2 group

The equilibrium constant at this temperature is Kc= 4.17 x 10⁻⁶.

Since the equilibrium constant depends on the equilibrium concentration of both the reactants and the products of the chemical reaction.

Balanced reaction equation

2CH₄(g)⇌C₂H₂(g)+3H₂(g)

The initial concentration of the CH₄ = 0.093 M

The equilibrium concentration of the H = 0.017 M

Equilibrium constant = ?

Let's make the ice table

2CH₄(g) ⇌ C₂H₂(g) + 3H₂(g)

0.093 M 0 0

-2x +x +3x

0.093-2x x 0.017 M

3x = 0.017 M

Therefore, x =0.017 M /3 = 0.00567 M

Therefore, the equilibrium concentration of CH₄ =

0.093 M – 2x = 0.093 M – (2 x 0.00567 M) = 0.0817 M

Equilibrium concentration of the C₂H₄ = x = 0.00567 M

Let's write the equilibrium constant expression

Kc= [C₂H₄[H2]³/[CH₄]²

Let's put the values in the formula

Kc= [0.00567][0.017]³/[0.0817]²

Kc= 4.17 x 10⁻⁶

Therefore, the equilibrium constant is 4.17 x 10⁻⁶.

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Answer:

B. Measures of central tendency

Explanation:

Mean, median and mode are best described as measures of central tendency of a given data set.

Mean is the average of the samples given

Mode is the data point with the most frequent occurrence

Median is the data point that lies in the middle

Answer:

No

Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride

Answer:

2NaCN + CaCO3 --> Na2CO3 + Ca(CN)2

Explanation:

Knowing the names gets us: NaCN + CaCO3 --> Na2CO3 + Ca(CN)2

Balance: there are two sodiums and cyanides on the product side so add a 2 to the reactant side.

The area of a rectangle that is 2.1- cm wide by 5.6- cm long is 11.76cm² in two significant figures.

Area is the measure of the extent of a surface. It is measured in square units.

The area of a rectangle can be calculated by multiplying the length of the rectangle by its width.

According to this question, a rectangle that is 2.1- cm wide by 5.6- cm long has an area of;

Area = 2.1cm × 5.6cm

Area = 11.76cm² (2s.f)

Therefore, the area of a rectangle that is 2.1- cm wide by 5.6- cm long is 11.76cm² in two significant figures.

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The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1, depending on which rate was used to calculate it.

The rate of the reaction is given by the equation:

Rate = -k[A]

where k is the rate constant and [A] is the concentration of the reactant.

Rate at t=140 s:

Rate = (8.00×10−2 M - 0 M) / (140 s - 0 s)

= 5.71×10−4 M/s

Rate at t=400 s:

Rate = (4.00×10−2 M - 0 M) / (400 s - 0 s)

= 1.00×10−4 M/s

Since this is a zero-order reaction, the rate of the reaction is constant, and we can use either rate to calculate the rate constant:

k = Rate / [A]

Using the rate at t=140 s:

k = 5.71×10−4 M/s / 8.00×10−2 M = 7.14×10−3 s−1

Using the rate at t=400 s:

k = 1.00×10−4 M/s / 4.00×10−2 M

= 2.50×10−3 s−1

The rate constant for the reaction is either 7.14×10−3 s−1 or 2.50×10−3 s−1.

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Atoms are the smallest indivisible part of an element while molecules are combinations of two or more atoms. See details below.

Atoms are the smallest possible amount of matter which still retains its identity as a chemical element, now known to consist of a nucleus surrounded by electrons.

Molecules, on the other hand, are the smallest particle of a specific element or compound that retains the chemical properties of that element or compound. They are two or more atoms held together by chemical bonds.

An element is the simplest chemical substance that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

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The number of ants the anteater can eat in a day is 39123 ants.

The number of ants the anteater can eat in a day is calculated as follows:

mass of ants the anteater can eat in day = 6.9 lb

mass of ants the anteater can eat in day in g = 6.9 lb* 453.6 g/1 lb

mass of ants the anteater can eat in day in g = 3129.84 g

mass of one ant in g = 80/1000 = 0.08 g

number of ants the anteater can eat in a day = 3129.84 g/0.08 g

number of ants the anteater can eat in a day = 39123

In conclusion, the number of ants the anteater can eat in a day is obtained from the ratio of the mass of ants eaten by the anteater in a day and the mass of one ant.

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Answer: The 2 nitrogens are the central atoms. They are bonded together by a double bond and each have one lone pair of electrons. The 2 fluorines each bond to one side of the nitrogen and have 3 lone pairs each.

Explanation:

Answer:

Explanation:

aluminum

Answer: The aluminum ion

Explanation:

Answer:

Two positive aspects of using methane recapture systems are able to generate significant electricity. Another benefit is that the process of anaerobic digestion creates heat that can be used to warm buildings where animals are kept

Answer:  The correct answer is;

Two positive aspects of using methane recapture systems include lowering the impact on greenhouse gasses and the production of energy. Methane is a very potent greenhouse gas that is contributing to global warming. As a result, the recapturing process reduces the methane impacts of global warming by reclaiming and reusing the gas for other purposes. Recaptured methane can be stored and used to generate electricity or used as fuel to power updated vehicles and other engines on the farm. The overall benefits from this combination are reducing impacts causing global warming and lower the cost of electricity or fuel on the farm.

Explanation:  This answer has been confirmed correct.

Both the left and right sides of the brain are responsible for controlling the motions of the left and right sides of the body, respectively.

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Answer:

what are the words? I don't see it

The empirical formula of the compound is C₂H₁₆S₂N₃O.

The moles of each element is as follows::

For CO₂:

Carbon (C) has a molar mass of 12.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles

Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles

For H₂O:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles

Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles

For SO₃:

Sulfur (S) has a molar mass of 32.06 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles

Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles

For HNO₃:

Hydrogen (H) has a molar mass of 1.01 g/mol.

Nitrogen (N) has a molar mass of 14.01 g/mol.

Oxygen (O) has a molar mass of 16.00 g/mol.

Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles

Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles

Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles

The simplest whole-number ratio of the elements will be:

Carbon: 0.173 moles / 0.080 moles ≈ 2.16

Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88

Sulfur: 0.149 moles / 0.080 moles ≈ 1.86

Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10

Oxygen: 0.080 moles / 0.080 moles = 1

Therefore, the empirical formula is C₂H₁₆S₂N₃O.

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Before administering eye drops, make sure to wash your hands thoroughly with soap and water to minimize the risk of introducing any contaminants.

Tilting your head back or lying down can help create a better angle for administering the eye drops and prevent them from running out of your eye.

Use your index finger to gently pull down the lower eyelid, creating a small pocket.

Carefully hold the dropper tip close to your eye, without touching your eye or eyelashes.

Follow the specific instructions provided with your eye drops to determine the appropriate number of drops to use. Squeeze the dropper to release the drops into the pocket created by pulling down your lower eyelid.

If any excess solution has spilled onto your skin, gently wipe it away with a clean tissue or cloth to avoid irritation.

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1. The mass of sodium sulfate, Na₂SO₄ formed from the reaction is 131.13 g

2. The percentage yield obtained from the reaction is 93.3%

We shall begin by obtaining the limiting reactant. This obtained as follow

2NaOH + H₂SO₄ —> Na₂SO₄ + 2H₂O

From the balanced equation above,

80 g of NaOH reacted with 98 g of H₂SO₄

Therefore,

98.6 g of NaOH will react with = (98.6 × 98) / 80 = 120.785 g of H₂SO₄

Since a higher amount (i.e 120.785 g) of H₂SO₄ than what was given (i.e 80.5 g) is needed to react with 98.6 g of NaOH, thus, the limiting reactant is H₂SO₄

Finally, we shall determine mass of sodium sulfate, Na₂SO₄ formed. Details below:

2NaOH + H₂SO₄ —> Na₂SO₄ + 2H₂O

From the balanced equation above,

98 g of H₂SO₄ reacted to produce 142 g of Na₂SO₄

Therefore,

90.5 g of H₂SO₄ will react to produce = (90.5 × 142) / 98 = 131.13 g of Na₂SO₄

Thus, the mass of mass of sodium sulfate, Na₂SO₄ formed is 131.13 g

The percentage yield obtained can be obtained as follow:

Percentage yield = (Actual /Theoretical) × 100

Percentage yield = (122.4 / 131.13) × 100

Percentage yield = 93.3%

Thus, the percentage yield is 93.3%

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To solve such this we must know the concept of chemical reaction and concept of limiting agent. Therefore, C\(_2\)H\(_3\)O\(_2\)H is limiting agent in the given balanced equation.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

The balanced reaction is

3 C\(_2\)H\(_3\)O\(_2\)H + Al(OH)\(_3\)\(\rightarrow\)

The limiting reagent depends on the mole ratio and not on the masses of the reactants present. 1 mole of  Al(OH)\(_3\) need 3 moles of 3 C\(_2\)H\(_3\)O\(_2\)H. So, C\(_2\)H\(_3\)O\(_2\)H is limiting reagent.

Therefore, C\(_2\)H\(_3\)O\(_2\)H is limiting reagent.

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The substance that can be classified as a solid is student C. Since it has definite shape and volume

We define a solid as a substance that is composed of matter. There are three main states of matter and these are solids, liquids and gases. The solid state must have a definite shape and must occupy a definite volume. The liquids have a definite volume but do not have a definite shape. The gases do not have both a definite shape and a definite volume.

We would now look at the table that the student have made so that we can be able to make our decision. It must be noted that the particles that compose the solid are solidly bound together such that are arranged in a definite pattern and can not be able to slide over each other. This is the reason for the fact that a solid has a definite shape and a definite volume.

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Answer: The volume of the sample after the reaction takes place is 29.25 L.

Explanation:

The given reaction equation is as follows.

\(OF_{2}(g) + H_{2}O(g) \rightarrow O_{2}(g) + 2HF(g)\)

So, moles of product formed are calculated as follows.

\(\frac{3}{2} \times 0.17 mol \\= 0.255 mol\)

Hence, the given data is as follows.

\(n_{1}\) = 0.17 mol,      \(n_{2}\) = 0.255 mol

\(V_{1}\) = 19.5 L,         \(V_{2} = ?\)

As the temperature and pressure are constant. Hence, formula used to calculate the volume of sample after the reaction is as follows.

\(\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\)

Substitute the values into above formula as follows.

\(\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}\\\frac{19.5 L}{0.17 mol} = \frac{V_{2}}{0.255 mol}\\V_{2} = \frac{19.5 L \times 0.255 mol}{0.17 mol}\\= \frac{4.9725}{0.17} L\\= 29.25 L\)

Thus, we can conclude that the volume of the sample after the reaction takes place is 29.25 L.

Answer:

the answer is a

Explanation:

an electron contains a negative charge and like charges repel each other. Hence, in a atom the force of repulsion between the atoms away from each other. As a result a molecules atoms are as far away from each others as they can get .

A molecule's atoms as far away from each other as they can get because "Forces between electron pairs push the atoms apart".

So, option C is correct one.

Since, an electron is negative charge species revolve around the nucleus of an atom. So, when two atoms come close to each other in molecules there is repulsion occurs between negative charge electron .

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The Earth can be divided into one of two ways – mechanically or chemically. Mechanically – or rheological, meaning the study of liquid states – it can be divided into the lithosphere, asthenosphere, mesospheric mantle, outer core, and the inner core.

Explanation:

The balanced form of the nuclear equation is as follows; 249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n.

A nuclear equation is process such as the fission of an atomic nucleus, or the fusion of one or more atomic nuclei and/or subatomic particles in which the number of protons and/or neutrons in a nucleus changes.

According to this question, Californium element is a reactant to produce dubnium and a neutron as products.

However, the law of conservation of mass must be fulfilled by ensuring the mass and atomic numbers of elements in reactant and product side are the same.

249/98 Cf + 15/7 N⟶ 260/105 Db + 4(1/0) n

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Answer:

the answer is (a)

Explanation:

an example of +1 oxidation state is Cu2O, where oxygen is 2- and so to balance the molecule, each copper atom is +1