Magnesium reacts with a silver nitrate solution
The reaction is represented by the ionic equation given
State why this reaction is considered a redox reaction

The column 1 has the value of Isotope, column 2 has the value of mass in atomic mass units, and column 3 has the value of abundance and the average atomic mass of strontium is 87.47 amu.

To calculate the average atomic mass of strontium using the given information, we need to multiply the mass of each isotope by its abundance and then sum up these values. Here's the calculation:

Isotope | Mass (amu) | Abundance

^84Sr | 83.913428 | 0.56%

^86Sr | 85.909273 | 9.86%

^87Sr | 86.908902 | 7.00%

^88Sr | 87.905625 | 82.58%

To find the average atomic mass, we multiply each isotope's mass by its abundance (in decimal form) and sum up the values:

Average atomic mass = (\(Mass of ^{84Sr}\) × \(Abundance of^{84Sr}\)) + (\(Mass of ^{86Sr}\)× \(Abundance of^{86Sr}\)) + (\(Mass of ^{87Sr}\) × \(Abundance of^{87Sr}\)) + (\(Mass of ^{88Sr}\) × \(Abundance of^{88Sr}\))

Average atomic mass = (83.913428 amu × 0.0056) + (85.909273 amu × 0.0986) + (86.908902 amu × 0.0700) + (87.905625 amu × 0.8258)

Calculating this expression yields:

Average atomic mass = 0.469901638 + 8.468098826 + 6.08462314 + 72.44409075

= 87.466714354 amu

Rounding the result to two decimal places, the average atomic mass of strontium is approximately 87.47 amu.

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Answer:

C.) If the solid is conductive, the bonds are metallic.

1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.

2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.

3) Substances with metallic  bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.

Explanation:

Answer:

1120 gm

Explanation:

6. Consider the reaction: CzHo (g) + 02 (8) - 4 CO2(g) + 6H2O (1)

(a) Balance the equation.

(b) How many grams of oxygen are required to react with 10 moles of ethane for a complete

combustion reaction?

FIRST, CORRECT THE EQUATION THEN BALANCE

2C2H6(G) + 7O2------------>  4CO2  + 6H2O

so for 10 moles of ethane, we need

7 X 5 = 35 MOLES O2

=35 MOLES O2

O2 HAS A MOLAR MASS OF 2X16 = 32 gm

35 MOLES OF O2 HAS A MASS OF 35 X 32 =1120 gm

To increase the gravitational force between the balloon and the golf ball, It should be filled with lead pieces. Option D

A substance's density, which measures its mass in relation to its volume, determines how much gravitational force it produces.

Lead bits are one of the suggested materials, and they are the one that would most likely boost the gravitational force. The density of lead is much higher than that of the other listed materials.

The high density of lead will result in an increase in the gravitational pull between the balloon and the golf ball if Jamie fills the balloon with lead bits.

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One carbon atom and one oxygen atom bound together by three bonds make up carbon monoxide. The number of molecules in 3.00 L of CO gas at STP is 67.2 liters.

Colorless, lethal, odorless, tasteless, and combustible, carbon monoxide is a gas that is somewhat less thick than air. One carbon atom and one oxygen atom bound together by three bonds make up carbon monoxide. The oxocarbon family's simplest molecule is this one.

Headache, dizziness, weakness, nausea, upset stomach, vomiting, chest discomfort, and confusion are the most typical signs of CO poisoning. The symptoms of CO are frequently compared to the flu. CO can cause you to lose consciousness or kill you if you breathe it in heavily.

If the gas is at STP,

Then 1 mole = 22.4 liters.

3 moles x 22.4 L/mol

= 67.2 liters.

Thus, The number of molecules in 3.00 L of CO gas at STP is 67.2 liters.

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After the reaction is complete, no nitrogen and no hydrogen molecules remain, and 8.00 x 1014 molecules of NH3 are produced.

In the equation, nitrogen and hydrogen react at a high temperature, in the presence of a catalyst, to produce ammonia, according to the balanced chemical equation:N2(g)+3H2(g)⟶2NH3(g)The coefficients of each molecule suggest that one molecule of nitrogen reacts with three molecules of hydrogen to create two molecules of ammonia.

So, to determine how many molecules of ammonia are produced when four nitrogen and nine hydrogen molecules are present, we must first determine which of the two reactants is the limiting reactant.

To find the limiting reactant, the number of moles of each reactant present in the equation must be determined.

Calculations:
Nitrogen (N2) molecules = 4Hence, the number of moles of N2 = 4/6.02 x 1023 mol-1 = 6.64 x 10-24 mol
Hydrogen (H2) molecules = 9Hence, the number of moles of H2 = 9/6.02 x 1023 mol-1 = 1.50 x 10-23 mol

Now we have to calculate the number of moles of NH3 produced when the number of moles of nitrogen and hydrogen are known, i.e., mole ratio of N2 and H2 is 1:3.

The mole ratio of N2 to NH3 is 1:2; thus, for every 1 mole of N2 consumed, 2 moles of NH3 are produced.
The mole ratio of H2 to NH3 is 3:2; thus, for every 3 moles of H2 consumed, 2 moles of NH3 are produced.
From these mole ratios, it can be observed that the limiting reactant is nitrogen.

Calculation for NH3 production:
Nitrogen (N2) moles = 6.64 x 10-24 moles
The mole ratio of N2 to NH3 is 1:2; therefore, moles of NH3 produced is 2 × 6.64 × 10−24 = 1.33 × 10−23 moles.

Now, to determine how many molecules of NH3 are produced, we need to convert moles to molecules.
1 mole = 6.02 x 1023 molecules
Thus, 1.33 x 10-23 moles of NH3 = 8.00 x 1014 molecules of NH3 produced.

To find the amount of each reactant remaining after the reaction is complete, we must first determine how many moles of nitrogen are consumed, then how many moles of hydrogen are consumed, and then subtract these from the initial number of moles of each reactant.

The moles of nitrogen consumed = 4 moles × 1 mole/1 mole N2 × 2 mole NH3/1 mole N2 = 8 moles NH3
The moles of hydrogen consumed = 9 moles × 2 mole NH3/3 mole H2 × 2 mole NH3/1 mole N2 = 4 moles NH3
Thus, the moles of nitrogen remaining = 6.64 × 10−24 mol – 8 × 2/3 × 6.02 × 10^23 mol-1 = 5.06 × 10−24 mol
The moles of hydrogen remaining = 1.50 × 10−23 mol – 4 × 2/3 × 6.02 × 10^23 mol-1 = 8.77 × 10−24 mol

Finally, the number of molecules of each reactant remaining can be calculated as follows:
Number of N2 molecules remaining = 5.06 × 10−24 mol × 6.02 × 10^23 molecules/mol = 3.05 × 10−1 molecules ≈ 0 molecules
Number of H2 molecules remaining = 8.77 × 10−24 mol × 6.02 × 10^23 molecules/mol = 5.28 × 10−1 molecules ≈ 0 molecules.

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0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

we can see that 3 moles of lithium hydroxide (LiOH) are produced for every 1 mole of lithium nitride (Li₃N) that reacts.

To determine the mass of LiOH produced from 0.38 g of Li₃N, we need to first calculate the number of moles of Li₃N present:

molar mass of Li₃N = 3 x atomic mass of Li + 1 x atomic mass of N

= 3 x 6.94 g/mol + 1 x 14.01 g/mol

= 34.83 g/mol

moles of Li₃N = mass / molar mass

= 0.38 g / 34.83 g/mol

= 0.01093 mol

Since the balanced equation shows that 1 mole of Li₃N produces 3 moles of LiOH, we can calculate the number of moles of LiOH produced:

moles of LiOH = 3 x moles of Li₃N

= 3 x 0.01093 mol

= 0.03279 mol

Finally, we can use the molar mass of LiOH to convert from moles to grams:

molar mass of LiOH = atomic mass of Li + 1 x atomic mass of O + 1 x atomic mass of H

= 6.94 g/mol + 15.99 g/mol + 1.01 g/mol

= 23.94 g/mol

mass of LiOH produced = moles of LiOH x molar mass of LiOH

= 0.03279 mol x 23.94 g/mol

= 0.785 g

Therefore, approximately 0.785 g of lithium hydroxide (LiOH) are produced when 0.38 g of lithium nitride (Li₃N) reacts with an excess of water.

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Answer:

At Anode: oxidation occurs i.e loss of electrons

At cathode: reduction occurs i.e gain of electrons

OPTION 1 is the correct answer

Answer:

9.) Homeostasis

10.) Epidermis

11.) Cytoplasim

12.) Classification

The correct answer is C: I and ||

Scientific notation is used for very large and very small numbers.

It is more comfortable sometimes to express numbers in scientific notation. The parts of a scientific notation for number are: coefficient, base and exponent.

The larger or smaller the exponent, the more convenient it is to express the number in scientific notation.

Hence, very large and very small numbers are best expressed in scientific notation.

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Answer:

3) 1.25

Explanation:

I had the same question and somehow got it right :)

The new volume will be determined by molarity and which will be  1.25 ml.

The volume of an object is just a measurement of how much space it takes up.

The molality refers to the moles of a solute in relation to the mass of the solvent, whereas the molarity refers to the moles of a solute in based on the volume of the solution. It can be denoted by M.

The formula of Molarity is

\(M_{1} V_{1} =M_{2}V_{2}\)

where, M is molarity and V is volume.

Calculation of volume.

It is given that,\(M_{1} = 0.1 M, M_{2} =0.0025 M.\)

Now, puts the value of given data in molarity equation.

\(M_{1} V_{1} = M_{2} V_{2}\)

\(V_{1} = M_{2} V_{2} /M_{1}\)

\(V_{1}\) = 0.005×25/0.1 = 1.25 ml

Therefore, the correct answer will be option 3.

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Calcium sulfate (CaSO4) is a chemical compound made from calcium, oxygen, and sulfur.

The major sources of calcium sulfate naturally happen are gypsum and anhydrite, which occur at many position worldwide as evaporites.

A simple procedure for preparing acicular calcium sulfate dihydrate is on condition that in which a slurry of calcium carbonate carrying 100 to 800 grams per lite of calcium carbonate is assorted with a solution of sulphuric acid carrying 80 to 500 grams per liter sulphuric acid in proportions that construct calcium sulfate.

So we can conclude that Calcium sulfate, CaSO4, is a natural happen calcium salt.

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Answer:

its sodium hydroxide

Explanation:

The balanced redox reaction is

\(3F(e)_3+ + 2N O^{-2} + 4H_2O\)→ \(3F(e)_2+ + 2N O^{-3} + 4H+\)

Let's start balancing the redox reaction. Here is the given redox reaction:

\(3F(e)_3+ + 2N O^{-2} + 4H_2O\) → \(F(e)_2+ + H+ + N O^{-3}\)

Step 1: Separate the redox reaction into two half-reactions.Half-reaction 1: \(F(e)_3+\)→ \(F(e)_2+\) Half-reaction 2: \(N O^{-2}+ H_2O\) → \(N O^{-3}+ H+\)

Step 2: Balance the elements other than H and O in each half-reaction. Balanced Half-reaction 1: \(F(e)_3+\) →\(F(e)_2+\)Balanced Half-reaction 2: \(N O^{-2} + H_2O\) → \(N O^{-3} + H+\)

Step 3: Balance the oxygen atoms by adding H2O to the side that needs oxygen . Balanced Half-reaction 1: \(F(e)_3+\) → \(F(e)_2+\) Balanced Half-reaction 2: \(N O^{-2}+ H_2O\) →\(N O^{-3} + H+ + H_2O\)

Step 4: Balance the hydrogen atoms by adding H+ to the side that needs hydrogen . Balanced Half-reaction 1: \(F(e)_3+\) → \(F(e)_2+\) + e− + H+Balanced Half-reaction 2: \(N O^{-2} + H_2O + H+ - > N O{-3}+ H+ + H_2O + e^-\)

Step 5: Determine the number of electrons required to balance the half-reaction . Balanced Half-reaction 1: \(F(e)_3+ - > F(e)_2+ + e^{-}+ H+\) [3 electrons are required]Balanced Half-reaction 2: \(N O^{2} + H_2O + H+ - > N O^{-3} + H+ + H_2O + e^-\)[2 electrons are required]

Step 6: Multiply the half-reactions by integers to make the number of electrons equal for both half-reactions.Balanced Half-reaction 1:\(3(F(e)_3+ - > F(e)_2+ + e^{-} + H+\) ).Balanced Half-reaction 2: \(2(N O^{-2} + H_2O + H+ - > N O^{-3}+ H+ + H_2O + e^{-})\)

Step 7: Add the balanced half-reactions together\(3F(e)_3+ + 2N O^{-2} + 4H+ - > 3F(e)_2+ + 2N O^{-3} + 2H_2O\) .The balanced redox reaction is:\(3F(e)_3+ + 2N O{-2} + 4H_2O - > 3F(e)_2+ + 2N O^{-3} + 4H+\)

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For any component: Proton count equals atomic number

Number of protons plus number of electrons equals the atomic number.

The number of neutrons is equal to the atomic number-mass number.

The quantity of protons in an element's atom is known as the atomic number. The atomic number of krypton in our illustration is 36. This indicates that the nucleus of a ruthenium atom contains 36 protons.

Every atom of ruthenium has 44 protons, which is intriguing. A Ruthenium atom cannot exist if it does not have 44 protons. A distinct element is produced by changing the number of protons in an atom's nucleus. An atom of rhodium is produced, for instance, by taking one proton away from a krypton atom.

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Explanation:

Solubility product is defined as the product of the concentrations or solubilities of the ions each raised to the power their stoichiometric coefficients present in the solution. It is expressed as \(K_{sp}\).

(a): CuBr

The chemical equation for the dissociation of CuBr into its ions follows:

\(CuBr\rightleftharpoons Cu^++Br^-\)

The expression of \(K_{sp}\) for CuBr follows:

\(K_{sp}=[Cu^+][Br^-]\)

(b): \(ZnC_2O_4\)

The chemical equation for the dissociation of \(ZnC_2O_4\) into its ions follows:

\(ZnC_2O_4\rightleftharpoons Zn^{2+}+C_2O_4^{2-}\)

The expression of \(K_{sp}\) for \(ZnC_2O_4\) follows:

\(K_{sp}=[Zn^{2+}][C_2O_4^{2-}]\)

(c): \(Ag_2CrO_4\)

The chemical equation for the dissociation of \(Ag_2CrO_4\) into its ions follows:

\(Ag_2CrO_4\rightleftharpoons 2Ag^{+}+CrO_4^{2-}\)

The expression of \(K_{sp}\) for \(Ag_2CrO_4\) follows:

\(K_{sp}=[Ag^{+}]^2[CrO_4^{2-}]\)

(d): \(ZnC_2O_4\)

The chemical equation for the dissociation of \(Hg_2Cl_2\) into its ions follows:

\(Hg_2Cl_2\rightleftharpoons 2Hg^{+}+2Cl^{-}\)

The expression of \(K_{sp}\) for \(Hg_2Cl_2\) follows:

\(K_{sp}=[Hg^{+}]^2[Cl^{-}]^2\)

(e): \(AlCl_3\)

The chemical equation for the dissociation of \(AlCl_3\) into its ions follows:

\(AlCl_3\rightleftharpoons Al^{3+}+3Cl^{-}\)

The expression of \(K_{sp}\) for \(AlCl_3\) follows:

\(K_{sp}=[Al^{3+}][Cl^{-}]^3\)

(f): \(ZnC_2O_4\)

The chemical equation for the dissociation of \(Mn_3(PO_4)_2\) into its ions follows:

\(Mn_3(PO_4)_2\rightleftharpoons 3Mn^{2+}+2PO_4^{3-}\)

The expression of \(K_{sp}\) for \(Mn_3(PO_4)_2\) follows:

\(K_{sp}=[Mn^{2+}]^3[PO_4^{3-}]^2\)

DNA and RNA can also be ISOLATED from the same biological sample.

So the answer is no, both DNA and RNA are together.

Answer:

so the answer is no

both DNA and RNA are together.

Explanation:

DNA and RNA can also be ISOLATED from the same. biological sample

Answer:

During complete oxidation of the fatty acid CH3(CH2)14COOH, eight molecules of acetyl-CoA are produced, and the fatty acid goes through the β-oxidation cycle seven times.

Explanation:

In the β-oxidation of fatty acids, an acetyl-CoA molecule is removed from the fatty acid chain after every β-oxidation cycle that the fatty acid undergo, leaving behind a fatty acyl-CoA molecule shortened by two cabon atoms..

The removal of the acetyl-CoA molecule starts from the carboxyl end and shortens the fatty acid molecule by two carbon units. Successive β-oxidation cycles results in the complete oxidaton of the fatty acid molecle to acetyl -CoA molecules.

The compound CH3(CH2)14COOH, is a 16-carbon saturated fatty acid molecule known as palmitic acid.. It undergoes seven passes through the β-oxidation cycle to yield eight molecules of acetyl-CoA with each cycle yielding an acetyl-CoA molecule and a fatty acyl-CoA shortened by two carbon atoms. Finally, the seventh step yields two acetyl-CoA molecules.

During complete oxidation of CH3(CH2)14COOH, eight (8) molecules of acetyl-CoA are produced, and the fatty acid goes through the β-oxidation cycle seven (7) times.

In conclusion, during complete oxidation of CH3(CH2)14COOH, eight (8) molecules of acetyl-CoA are produced, and the fatty acid goes through the β-oxidation cycle seven (7) times.

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A leather jacket and printer paper are examples of items that can be made from renewable resources, while plastic forks, metal cans, and electronics are not considered renewable due to their reliance on non-renewable materials and processes. Option  C, E

The two correct answers that are made from renewable resources are:

C) Leather jacket: Leather is derived from animal hides, which are a byproduct of the meat industry. As long as there is a sustainable and responsible approach to animal farming, the production of leather can be considered renewable. The hides are obtained from animals that are raised for meat consumption, and their use in leather production helps reduce waste.

E) Printer paper: Printer paper can be made from various sources, including trees, bamboo, and recycled paper fibers. If the paper is sourced from sustainably managed forests or from fast-growing plants like bamboo, it can be considered renewable. Additionally, the use of recycled paper fibers reduces the demand for materials and promotes a more circular economy.

The other options, A) plastic fork, B) metal can, and D) electronics, are not made from renewable resources:

A) Plastic fork: Plastics are typically derived from fossil fuels, which are non-renewable resources. The production of plastic involves the extraction and processing of petroleum or natural gas, both of which are finite resources.

B) Metal can: Metal cans are predominantly made from aluminum or steel. While these metals can be recycled, their initial production requires the extraction of raw materials from the Earth, which is not a renewable process.

D) Electronics: Electronics are made from a wide range of materials, including metals, plastics, and various chemical compounds. The production of electronics involves the extraction of raw materials, many of which are non-renewable resources.

Option C and E.

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Answer:

Option A. The specific heat is 0.897 J/gºC, The Substance is aluminum.

Explanation:

We'll begin by calculating the change in temperature of the substance. This can be obtained as follow:

Initial temperature (T₁) = 20.0 °C

Final temperature (T₂) = 40.0 °C

Change in temperature (ΔT) =?

ΔT = T₂ – T₁

ΔT = 40 – 20

ΔT = 20 °C

Finally, we shall determine the specific heat capacity of the substance. This can be obtained as follow:

Mass (M) = 136 g

Change in temperature (ΔT) = 20 °C

Heat (Q) absorbed = 2440 J

Specific heat capacity (C) =?

Q = MCΔT

2440 = 136 × C × 20

2440 = 2720 × C

Divide both side by 2720

C = 2440 / 2720

C = 0.897 J/gºC

Comparing the specific heat capacity (i.e 0.897 J/gºC) of the substance with those in the table above, the substance is Aluminum.

Thus, option A gives the correct answer to the question.

Some real-world examples of convection are as follows:

Convection may be defined as the methodology through which heat is significantly transferred by the normal movement of a heated fluid such as air or water within the component.

The process of convection remarkably involves the transfer of heat through a fluid (liquid or gas) that is provoked by molecular motion.

Therefore, some real-world examples of convection are well-described above.

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Answer:

distillation

Explanation:

distillation is better suited separation method

Precision relates to the consistency and reproducibility of measurements, while accuracy reflects how close measurements are to the true value.

Precision and accuracy are two important concepts in the context of errors in measurements. While they both pertain to the quality of data, they refer to different aspects.

Precision refers to the degree of consistency or reproducibility in a series of measurements. It reflects the scatter or spread of data points around the average value. If the measurements have low scatter and are tightly clustered, they are considered precise. On the other hand, if the measurements have a high scatter and are widely dispersed, they are considered imprecise.

Accuracy, on the other hand, refers to the closeness of measurements to the true or target value. It represents how well the measured values align with the actual value. Accuracy is achieved when measurements have a small systematic or constant error, which is the difference between the average measured value and the true value.

Errors in measurements can be classified into two types: random errors and systematic errors.

Random errors are associated with the inherent limitations of measurement instruments or fluctuations in the measurement process. They lead to imprecise data and affect the precision of measurements. Random errors can be reduced by repeating measurements and calculating the average to minimize the effect of individual errors.

Systematic errors, on the other hand, are caused by consistent biases or inaccuracies in the measurement process. They affect the accuracy of measurements and lead to a deviation from the true value. Systematic errors can arise from factors such as instrumental calibration issues, environmental conditions, or experimental techniques. These errors need to be identified and minimized to improve the accuracy of measurements.

In summary, precision refers to the degree of consistency or reproducibility of measurements, while accuracy refers to the closeness of measurements to the true value. Random errors affect precision, while systematic errors affect accuracy. To ensure high-quality measurements, both precision and accuracy need to be considered and appropriate techniques should be employed to minimize errors.

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Answer:

Terbium

Explanation:

Answer:

One atom of sulfur has a mass of 32.07 AMU; one mole of S atoms has a mass of 32.07 g.

Explanation:

Therefore, the answer should be 32.07 g

Answer: c (the amount of empty space between the water particles will decrease)

Explanation: i got it right:)

Answer:

6 mol CO2

Explanation:

According to the equation, 6 moles of O2 will produce 6 moles of CO2, so the ratio is 1:1

therefore 6 moles of O2 will produce 6 moles of CO2