Calculate the number of moles in 7.04 g of lead (II) nitrate, Pb(NO3)2
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You can estimate the value of 22 % of 78 by finding 10 % of 78 and then adding another 10% to reach as close to 22 % as possible.

Start by finding 10% of 78. Divide 78 by 10 to get 7.8. Since you want to estimate 22%, you can take the calculated value of 10% (7.8) and multiply it by 2 to get 15.6.

Next, compare the estimated value of 15.6 with the actual value of 22% of 78. Calculate the actual value by multiplying 78 by 0.22 (since 22% is equivalent to 0.22). The result is 17.16.

Compare the estimated value of 15.6 with the actual value of 17.16.

By comparing the estimated value of 15.6 with the actual value of 17.16, you can assess the reasonability of your estimate.

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The given redox reaction can be represented in the following way: MnO₂ → MnO⁴⁻ + Ag → Ag+

To balance the redox reaction, the following steps are to be followed:

1: First, balance the net ionic equation with the help of half-reactions:

MnO2 → MnO⁴⁻+ e- [Oxidation Half-Reaction]

Ag+ + e- → Ag [Reduction Half-Reaction]

2: Determine the number of electrons that are required to balance the half-reactions. The oxidation half-reaction requires five electrons.

MnO₂ → MnO⁴⁻+ 5e-

The reduction half-reaction requires one electron.

Ag+ + e- → Ag

3: Find the least common multiple of the electrons required in the half-reactions, and use it to balance the equation. The least common multiple of 5 and 1 is 5. To balance the equation, multiply the oxidation half-reaction by 1 and the reduction half-reaction by 5. This will give us the following balanced equation:

5MnO₂ + 16H₂O + Ag → 5MnO⁴⁻ + 8OH- + 4Ag+

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Answer:

for question a element A and B are isobars

for question b element C and D have the same atomic numbers.

Explanation:

The value of an investment at the end of a specific time period is the Future value.

Future value is defined as the value of an asset or investment at a specific date in the future. It is calculated based on the present value of the investment, the interest rate, and the number of time periods. It is an important concept in finance as it recognizes the time value of money.

The time value of money recognizes that money today is worth more than the same amount of money in the future because of its earning potential. In other words, a dollar today is worth more than a dollar tomorrow because you can invest it and earn interest.

Future value takes into account the effects of compounding interest, which means that interest earned on an investment is added to the principal, and interest is earned on the new total.

On the other hand, NPV, ARR, net cash flows, and payback period are other important concepts in finance, but they do not explicitly recognize the time value of money. Net Present Value (NPV) is the difference between the present value of cash inflows and the present value of cash outflows.

ARR stands for Accounting Rate of Return, which is the average annual income from an investment over its life. Net cash flows are the total amount of cash inflows minus cash outflows. The payback period is the amount of time it takes for an investment to recoup its initial cost.

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Answer:

1.31M

Explanation:

Based on the reaction, 1 mole of Zn produce 1 mole of ZnCl₂. As the reaction occurs completely, the moles of Zn added = Moles of ZnCl₂ produced. To find molarity we need the moles of ZnCl₂ and the volume of the solution in liters:

Moles Zn = Moles ZnCl₂ -Molar mass Zn: 65.38g/mol-:

15g * (1mol / 65.38g) = 0.23 moles of ZnCl₂

Volume in Liters:

175mL * (1L / 1000mL) = 0.175L

The molarity is:

0.23moles / 0.175L

Answer: 1.11 g/mL is the density

Answer:

49.6 mL

Explanation:

is the answer, I just did it :)

49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.

Molarity of a given solution is known as the total number of moles of solute per litre of the solution.  A solution that is 1.00 molar (written 1.00 M) contains 1.00 mole of solute for every liter of solution.

Molarity = (No. of moles of solute ÷ Volume of solution in liters)

The unit of molarity is mol L⁻¹.

Molarity is temperature dependent because as temperature changes, volume of the solution also changes.

We can also use the formula-

M1V1 = M2V2

M1 = 0.25

V2 = 400mL

M2 = 0.0310

V1 = ?

V1 = M2V2/ M1

V1 = 49.6mL

Therefore, 49.6mL of a 0.250 M sucrose solution must be used to prepare 400.0 mL of a 0.0310 M solution.

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Answer:

see explanation

Explanation:

1. mid-ocean ridge

2.gravity

3.normal,reverse

4.cools

5.stripes

6.spreading

7.continents

Answer: d. Water is the most abundant atom in Earth’s atmosphere.

Explanation:

Water percentage in the atmosphere is 0.001 percent only as it not the major reservoir or source of water. The water is available in the atmosphere in the form of water vapors. These water vapors when aggregate and their concentration becomes high they fall down as rain on earth so the rain is collected in water reservoirs like oceans, rivers, lakes, ponds, aquifers, and other sources of water, which are the components of hydrosphere on earth. So, hydrosphere is most abundant in water. Moreover, water is not an atom instead it is the molecule formed by the combination of two molecules of hydrogen and one molecule of oxygen.

◕‿↼ Hey There!

Answer → Source Noble Gases have a full valence shell, which is why they rarely form bonds with other atoms.

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Answer: m=Q/c*\Delta TQ/c∗ΔT = 1450cal/(0.11cal/g* 19.7ºC)=669.12 g1450cal/(0.11cal/g∗19.7ºC)=669.12g

Answer: 669.12g iron.

Explanation:

Answer:

c

Explanation:

A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

chemical reaction, the transformation of one or more chemicals (the reactants) into one or more distinct compounds (the products). Chemical elements or chemical compounds make up substances.

A chemical reaction is one in which  two or more reactants will react to form a new substance. When new substance will form it will produce heat. Therefore, when science teacher was mixing two liquids it was generating heat.

Heating a substance allow molecules to move faster. When heat is given to the object it will move fast. When heat will apply to a solid it will turn into liquid. When heat is supplied to the liquid it will turn into gas.

Therefore, A chemical reaction produced a new substance. In a chemical reaction, the atoms that make up the reactants are rearranged to produce various products.

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Answer:

It takes 86 days take to cover half of the lake

Explanation:

In the day #1, the amount of the algae is X,

In the day #2 is 2X

In the day #3 is 2*2*X = X*2²

...

In the day #n the amount of the algae is X*2^(n-1)

Assuming X = 1m³. In the day 87, the area infected was:

1m³*2^(87-1)

7.74x10²⁵m³ is the total area of the lake

the half of this amount is 3.87x10²⁵m³

The time transcurred is:

3.87x10²⁵m³ = 1m³*2^(n-1)

Multiplying for 5 in each side:

ln (3.87x10²⁵) = ln (2^(n-1))

58.9175 = n-1 * 0.6931

85 = n-1

86 = n

Answer:

It is proved that sin20=2sin0.cos0

Explanation:

Given

[tex]0=30[/tex] °

[tex]sin20=2sin0.cos0[/tex]

Substituting the value of "0" on both the sides, we get -

[tex]sin2 (30) =2sin 30 * cos 30\\sin 60 = 2 * sin 30 * cos 30 \\0.866 = 2 * 0.5 * 0.866\\0.866 = 0.866[/tex]

Since LHS = RHS

we can say that [tex]sin20=2sin0.cos0[/tex]

Answer:

Transverse waves are known by motion being perpendicular to the waves movements. Longitudinal waves move in a direction parallel to the way the wave moves. Water waves are an example of both as they move in a clockwise motion.

Explanation:

( Sorry if it is not the best answer but I did my best by researching )

Answer:

1.59

Explanation:

14=pOH+pH

pOH=14-12.41

pOH=1.59

We can see here that the product(s) formed at the cathode in the electrolysis of an aqueous solution of [tex]K_{2}SO_{4}[/tex] are: 2. H2 and OH-

Electrolysis is a chemical process that involves the use of an electric current to drive a non-spontaneous chemical reaction. It is typically carried out in an electrolytic cell, which consists of two electrodes—an anode (positive electrode) and a cathode (negative electrode)—immersed in an electrolyte solution.

During electrolysis, when an electric current is passed through the electrolyte, chemical reactions occur at the electrodes.

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Answer:

Mass of truck = 29.62 kg (Approx.)

Explanation:

Given:

Kinetic energy = 1200 J

Speed of truck = 9 m/s

Find:

Mass

Computation:

The kinetic energy of a thing is the force that has attributable to its movement in physics.

Kinetic energy = [1/2][m][v]²

1,200 = [1/2][m][9]²

1,200 = [1/2][m][81]

Mass of truck = 29.62 kg (Approx.)

Answer:

please give me brainlist and follow

Explanation:

In the musculoskeletal system, the muscular and skeletal systems work together to support and move the body. The bones of the skeletal system serve to protect the body's organs, support the weight of the body, and give the body shape.

Answer:

B. bending of the arm

Explanation:

  Balanced net ionic equation will be:  Pb2+(aq) + 2I-(aq) → PbI2(s)

   The balanced chemical equation for the given reaction is;Pb(NO3)2(aq) + 2NaI(aq) → PbI2(s) + 2NaNO3(aq)

This equation is balanced because the number of atoms of the elements present on both sides of the equation is equal.

The states of the substances in the above equation are:

aqueous Pb(NO3)2(aq) , aqueous NaI (aq) → soluble, based on the solubility table PbI2 (s) → precipitate, based on the solubility tableaqueous NaNO3 (aq)

Cancel out the spectator ions from the above equation and the net ionic equation will be:

Pb2+(aq) + 2I-(aq) → PbI2(s)

Hence, the balanced net ionic equation for the given reaction between aqueous Pb(NO3)2 and aqueous NaI and correctly label the states are Pb2+(aq) + 2I-(aq) → PbI2(s) and the states are as follows;

Pb2+(aq) → AqueousI-(aq) → AqueousPbI2(s) → Solid

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The ionic equation for the reaction is given as follows:Pb2+ (aq) + 2NO3- (aq) + 2Na+ (aq) + 2I- (aq) → PbI2 (s) + 2Na+ (aq) + 2NO3- (aq)The net ionic equation is the same as the ionic equation, with spectator ions removed.Pb2+ (aq) + 2I- (aq) → PbI2 (s)The final balanced net ionic equation is given as follows:Pb2+ (aq) + 2I- (aq) → PbI2 (s).

The balanced net ionic equation for the following reaction between aqueous Pb(NO3)2 and aqueous NaI and correctly label the states are given below:Explanation:Aqueous lead(II) nitrate (Pb(NO3)2) and aqueous sodium iodide (NaI) are mixed to form solid lead(II) iodide (PbI2) and aqueous sodium nitrate (NaNO3).Before writing the net ionic equation, it is important to determine whether a precipitate will form. By referencing the solubility table, it is discovered that lead(II) iodide is insoluble in water, indicating that a precipitate will form when the two solutions are mixed.The balanced molecular equation for the reaction is given as follows:Pb(NO3)2 (aq) + 2NaI (aq) → PbI2 (s) + 2NaNO3 (aq)To write the ionic equation, the insoluble solid lead(II) iodide must be separated into its component ions. PbI2 is a precipitate; it will not dissociate, while NaNO3 will dissociate into its component ions. The ionic equation for the reaction is given as follows:Pb2+ (aq) + 2NO3- (aq) + 2Na+ (aq) + 2I- (aq) → PbI2 (s) + 2Na+ (aq) + 2NO3- (aq)The net ionic equation is the same as the ionic equation, with spectator ions removed.Pb2+ (aq) + 2I- (aq) → PbI2 (s)The final balanced net ionic equation is given as follows:Pb2+ (aq) + 2I- (aq) → PbI2 (s).

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The amount of KNO₃ would dissolve in 100g of water at 50 degrees celcuis to make a saturated solution is 44 g.

To create a saturated solution of KNO₃ in 100g of water at 50 degrees Celsius, the following steps should be taken:

Step 1: Find out the mass of the solvent in the saturated solution.

The solvent is water in this instance. So, using the formula for the mass of a solution, we can calculate the mass of the solvent in the saturated solution as follows:

Mass of solvent = Mass of solution - Mass of solute

= 100 g - Mass of KNO₃

Step 2: Determine the amount of solute that would be dissolved in the solution to make it saturated.

The mass of KNO₃ that would dissolve in 100 g of water at 50°C to create a saturated solution is 56g/100g of water.

Step 3: Calculate the mass of KNO₃ that would dissolve in 100g of water to make a saturated solution.

Mass of KNO₃ = Solubility of KNO₃ × Mass of solvent

Mass of KNO₃ = 56 g/100 g × (100 g - Mass of KNO₃)

Now, let's solve for Mass of KNO₃;

56 = 56g(100-Mass of KNO₃)/100100 - Mass of KNO₃ = 100

Multiply both sides of the equation by 100 to obtain;

5600 - 100 Mass of KNO₃ = 100

Mass of KNO₃ = 5600/10100 - 56

= 44 g

Therefore, 44 g of KNO₃ would dissolve in 100g of water to make a saturated solution.

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The final volume of the reconstituted cefazolin solution is 4 mL.  The volume of the cefazolin powder is 0.6 mL. The final volume of the 100 mg/mL cefazolin solution is 10 mL.

The packaging insert instructs to add 3.4 mL of sterile water without bacteriostat to the 1-g vial of cefazolin. This results in a reconstituted solution with a concentration of 250 mg/mL.

To find the final volume, we can set up the equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (250 mg/mL) and the amount of drug (1 g = 1000 mg), we can rearrange the equation to find the final volume:

250 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 250 mg/mL = 4 mL

Therefore, the final volume of the reconstituted cefazolin solution is 4 mL.

To find the volume of the cefazolin powder, we need to subtract the volume of sterile water added from the final volume of the reconstituted solution.

Given that 3.4 mL of sterile water is added to the vial, and the final volume of the reconstituted solution is 4 mL, we can calculate the volume of the cefazolin powder as follows:

Volume of cefazolin powder = Final volume - Volume of sterile water added

Volume of cefazolin powder = 4 mL - 3.4 mL = 0.6 mL

Therefore, the volume of the cefazolin powder is 0.6 mL.

To determine the final volume of the 100 mg/mL cefazolin solution, we can use the concentration and the amount of drug.

We are given that the resulting concentration after reconstitution should be 100 mg/mL. Considering the amount of drug is 1 g (1000 mg), we can set up the following equation:

Concentration of reconstituted solution = Amount of drug / Final volume

Using the given concentration (100 mg/mL) and the amount of drug (1000 mg), we can rearrange the equation to find the final volume:

100 mg/mL = 1000 mg / Final volume

Solving for the final volume:

Final volume = 1000 mg / 100 mg/mL

Final volume = 10 mL

Therefore, the final volume of the 100 mg/mL cefazolin solution is 10 mL.

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plant life dies

Explanation:

if all water disappears then plants would dry up and die, wich would impact the food chain

Answer:

The lymphatic system produces white blood cells, known as lymphocytes. There are two types of lymphocyte, T cells and B cells. They both travel through the lymphatic system. As they reach the lymph nodes, they are filtered and become activated by contact with viruses, bacteria, foreign particles, and so on in the lymph fluid.

Explanation:

Answer:

Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior out into space, where it interacts with the solar wind, a stream of charged particles emanating from the Sun.

Answer:

The density of copper is 8.9 grams per cubic centimeter.

Explanation:

There is a writing mistake in statement, correct form is written below:

A 124.6 grams sample of copper has a volume of 14 cubic centimeters. What is the density of copper?

Let suppose that mass of the copper sample is distributed uniformly in its volume, then we shall use the following definition of density ([tex]\rho[/tex]), in grams per cubic centimeter:

[tex]\rho = \frac{m}{V}[/tex] (1)

Where:

[tex]m[/tex] - Mass, in grams.

[tex]V[/tex] - Volume, in cubic centimeters.

If we know that [tex]m = 124.6\,g[/tex] and [tex]V = 14\,cm^{3}[/tex], then the density of the sample of copper is:

[tex]\rho = \frac{m}{V}[/tex]

[tex]\rho = 8.9\,\frac{g}{cm^{3}}[/tex]

The density of copper is 8.9 grams per cubic centimeter.

For the rusting of an iron bar, a chemical change occurs; while for the freezing of a substance , a physical change occurs.

When an iron bar rusts, a chemical change occurs. Rusting is a chemical reaction that involves the oxidation of iron in the presence of oxygen and water. The iron undergoes a chemical transformation and forms a new compound, iron oxide, which gives the rusty appearance. This change is irreversible and involves a rearrangement of atoms at the molecular level.

On the other hand, when a substance freezes, a physical change takes place. Freezing is a phase transition from a liquid to a solid state. During freezing, the substance undergoes a change in its physical state without any alteration in its chemical composition. The arrangement of molecules or atoms becomes more ordered as they transition from a disordered liquid state to a more structured solid state. This change is reversible, and the substance can return to its liquid state by melting.

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Answer:

plz I. need a brainliest

Explanation:

I hope you have a good day

Answer:

1.  electrons

2. From "Y" to "X"

Explanation:

1. Electrons move between the rod since the electrons are the only charge carriers which are free to move.

2. The particles move from from "Y" to "X"  since the electrons are the only charge carriers which are free to move. The positive charge on rod x is due to a deficit of electrons while the negative charge on rod Y is due to the excess of electrons. When the rods come together, the electrons move from "Y" to "X" since the electrons are the only charge carriers which are free to move.