NEED HELP PLEASE!!!!

The mass of the average marble in the sack is 12.35 g.

Total number of marbles in the bag = number of red marbles + number of green marbles

Mass of each green marble = 12.70g

Mass of each red marble = 11.50g

Total mass of green marbles = 24,351(12.70g) = 309257.70 g

Total mass of red marbles = 10,051(11.50g) = 115586.50 g

Total mass of marbles in the sack = 309257.70 g + 115586.5 g = 424844.22 g

Total number of marbles in the sack = 24,351 + 10,051 = 34402 marbles

Therefore;

Mass of the average marble in the sack = 424844.22 g/34402 marbles

= 12.35 g

Hence, the mass of the average marble in the sack is 12.35 g

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Answer:

where is the question

Explanation:

The correct answer is "C.

The type of exercise that Mei is doing is the "Machine exercise."

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The percent composition of hydrogen and oxygen are 11.2% and 88.8% respectively and the number of moles of hydrogen and oxygen are 1.34 moles and 0.66 moles respectively.

The percentage composition of a given compound is defined as the ratio of the amount of each element to the total amount of individual elements present in the compound multiplied by 100.

Here, the quantity is measured in terms of grams of the elements present.

The significance of this composition calculation is found in the chemical analysis.

Given,

Mass of hydrogen = 2.688g

Mass of oxygen = 21.32g

Total mass = 2.688 + 21.32 =  24.008g

Percent composition = (Mass of the substance / Total mass) × 100

Percent composition of hydrogen = ( 2.688 / 24.008) × 100

                                                        = 11.2%

Percent composition of oxygen  = ( 21.32 / 24.008) × 100

                                                          = 88.8%

Number of moles of hydrogen = 2.688 / 2 = 1.34 moles

Number of moles of oxygen = 21.32 / 32 = 0.66 moles

Therefore, the percent composition of hydrogen and oxygen are 11.2% and 88.8% respectively and the number of moles of hydrogen and oxygen are 1.34 moles and 0.66 moles respectively.

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Answer:

Explanation:

i) in keeping industrial machine cool

ii) in textile inustries for dying clothes

The changes that I would make in my experimental procedure to  determine the rate law for the oxidation of the red dye by sodium hypochlorite is that the wavelength at which the dye concentration is calculated would be changed as a result of the operation.

Since there would be an alteration in the wavelength at which the dye concentration, You shouldn't measure at the wavelength where the blue dye absorbs since you would no longer be attempting to detect the rate of oxidation of the blue dye.

Most likely, the red dye absorbs more light at a different, lower wavelength. Decide on the best wavelength to use to measure the red dye concentration, then switch to that wavelength to evaluate the kinetics.

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The number of molecules of oxygen in the cylinder is 6.02×10²³ molecules

From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×10²³ molecules. This implies that 1 mole of oxygen contains 6.02×10²³ molecules.

Since the cylinder contains 1 mole of oxygen, then the number of molecules of oxygen present in the cylinder is 6.02×10²³ molecules.

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Answer:

the answer is B.

Explanation:

The mass concentration of sand in the ethanol solution is 0.299 g/dm³.

To find the concentration in grams per cubic decimeter (g/dm³), we first need to convert the volume from liters to cubic decimeters (dm³). Since 1 liter is equal to 1 cubic decimeter, we can directly convert the volume.

Given:

Mass of sand = 0.2 g

Volume of ethanol = two-thirds liter

Converting volume to dm³:

1 liter = 1 cubic decimeter

two-thirds liter = (2/3) cubic decimeter = 0.67 dm³ (rounded to two decimal places)

Now we can calculate the concentration in g/dm³ by dividing the mass of sand by the volume in dm³:

Concentration = Mass / Volume

Concentration = 0.2 g / 0.67 dm³

Concentration ≈ 0.299 g/dm³ (rounded to three decimal places)

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Answer:

13. Prime Meridian

14. North Pole

15. South Pole

16. c.

Explanation:

13. The prime meridian is the line drawn north to south at 0° (0 degrees) longitude.

14. The latitude of the North Pole is 90 degrees N, and the latitude of the South Pole is 90 degrees S. Like the poles, some circles of latitude are named.

15. The geographic South Pole is located at 90 degrees south latitude. The geographic South Pole is located at 90 degrees south latitude. The station accommodates up to 250 people during the austral summer. Temperatures there average minus 60 degrees Fahrenheit year-round

16. The meridian that runs through Greenwich, England, is internationally accepted as the line of 0 degrees longitude, or prime meridian

Based on the given reaction, the acid-base pairs in this reaction are:

An acid-base pair refers to a set of two chemical species that are related through the transfer of a proton (H+ ion) during a chemical reaction.

One species acts as an acid by donating a proton, while the other acts as a base by accepting that proton.

In the given reaction:

HCO₃⁻ (aq) + NH₃ (aq) → NH₄⁺ + CO₃²⁻

An acid-base pair can be identified as follows:

HCO₃⁻ (bicarbonate ion) can act as an acid by donating a proton (H⁺), becoming CO₃⁻.

NH₃ (ammonia) can act as a base by accepting a proton (H⁺), becoming NH₄⁺ (ammonium ion).

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Answer:

kay, so u didn't gave the list but I guess I'm right...bcz of some words you wrote below..

yeah,

so your answer is GERMINATION

Answer:

A

Explanation:

Utility knife

Answer:

Utility knife

Explanation:

Answer:

227.5kpa

Explanation:

Tyre pressure is the air pressure present in the tubes of the tires to maintain the grip and movement. The tire pressure gauge will be 227.527 kPa.

Pascal is the SI unit of the air pressure and hydraulic pressure, whereas the pounds per square inch is the imperial unit of the air pressure measurement.

We know, that 1 (PSI)  pounds per square inch are equivalent to 6,895 Pa. Then, 33 PSI will be:

\(33 \times 6,895 = 227,527.08 \;\rm Pascals\)

If one kilopascal contains 1000 pascals, therefore, 227,527.08 Pa contains,

\(\dfrac{ 227,527.08}{1000}= 227.527 \;\rm kPa\)

Therefore, 227.527 kPa is equivalent to 33 PSI.

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The net ionic equation of the reaction is as follows:

4 Al3+(aq) + 12 NO3-(aq) + 3 Ag(s) = 4 Al(s) + 12 Ag+(aq) + 12 NO3-(aq)

Ions which remain in their ground state and do not take part in the reaction are called spectator ions. The net ionic equation cancels out these ions, which are present on both the reactant and product sides of the equation.

Spectator ions, which can be found on both the reactant and product sides, but are not included in the finished reaction from the net ionic equation. The \(NO^3^-\) ions are spectator ions in this example, thus taking them out of the equation. The net ionic equation makes up the rest of the species.

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Answer: EXTINCTION

Explanation:

Answer:

extinction

Explanation:

Rust is iron oxide, the corrosion product of iron when exposed to the oxygen in the air. Tin is not iron, so you cannot produce iron oxide from the corrosion of tin. Because the layer of tin on the surface of the steel prevents atmospheric oxygen and moisture from contacting the steel.

Answer:

Rust is iron oxide, the corrosion product of iron when exposed to the oxygen in the air. Tin is not iron, so you cannot produce iron oxide from the corrosion of tin.

Explanation:

The molarity of the chloride ions in the final solution is 0.747 M.

Given:

1.60 g of solid NaCl to 50.0 mL of 0.100 M calcium chloride solution.

To find:

The molarity of chloride ions in the final solution.

Solution:

Molarity of the calcium chloride solution = 0.100 M

Volume of the  calcium chloride  solution = V = 50.0 mL

\(1mL=0.001 L\\\\V=50.0mL=50.0 \times 0.001 L\\\\= 0.050 L\)

Moles of calcium chloride = n

\(0.100 M=\frac{n}{0.050 L}\\\\n=0.100 M\times 0.050 L=0.005 mol\)

\(CaCl_2(aq)\rightarrow Ca^+(aq)+2Cl^-(aq)\)

Moles of chloride ions in solution = \(2\times 0.005 mol=0.010 mol\)

Mass of sodium chloride = 1.60 g

Moles of sodium chloride :

= \(\frac{1.60 g}{58.5 g/mol}=0.02735 mol\)

\(NaCl(s)\rightarrow Na^+(aq)+Cl^-(aq)\)

Moles of chloride ions coming from 1.60 grams of NaCl = 0.02735 mol

Total moles of chloride ion in the final solution:

\(= 0.010 mol+0.02735 mol=0.03735 mol\)

The molarity of the chloride ion in the final solution:

\(=\frac{0.03735 mol}{0.050 L}=0.747M\)

The molarity of the chloride ions in the final solution is 0.747 M.

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Answer:

The netto reaction equation is:

2 OH- + 2H+ = 2 H2O  

So the answer is 2 moles.

The value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.

Waves spreading outward around obstructions is known as diffraction. Sound, electromagnetic radiation like light, X-rays, even gamma rays, as well as very tiny moving particles like atoms, neutrons, even electrons that exhibit wavelike qualities all exhibit diffraction.

When a loudspeaker emits sound of different wavelengths or frequencies, the loudspeaker itself functions as an obstruction and casts a shadow to its back, diffusing just the longer bass notes there.

2dsin θ = nλ

substituting all the given values in the above equation, we get  

2×d×sin θ = n×λ

2×126 ×sin θ =1× 58.0

θ = 45°

Therefore, the value of θ for the first diffraction line (n = 1) in bcc iron (atomic radius 126 pm) when the X-ray wavelength is 58.0 pm is 45°.

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Answer:

How do amoeba respire.

Define Diffusion.

Since [H2NO2] is equal to zero in this case, the percent ionization is equal to 100%.

Ionization is the process of adding an electrical charge to a neutral atom or molecule, resulting in the formation of positively or negatively charged ions. The process involves the transfer of electrons from one atom or molecule to another, which can occur through chemical reactions, physical collisions, or exposure to radiation. Ionization is an important process in many fields, including chemistry, physics, and biology.

The pH of a .780 M HNO2 solution can be calculated using the Henderson-Hasselbalch equation. This equation states that the pH of a solution is equal to the pKa of the acid plus the logarithm of the base to acid ratio. In this case, the pKa of HNO2 is 3.4, so the pH is equal to 3.4 + log(.780/1) = 2.10.

The percent ionization of the solution can be calculated using the formula:

% ionization = ( [HNO2] - [H2NO2] ) / [HNO2] * 100

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a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. The volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

a. The chemical equation for the electrolysis of water is:

2H2O(l) → 2H2(g) + O2(g)

b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).

c. According to the balanced chemical equation, for every 2 moles of water (H2O) electrolyzed, 1 mole of oxygen gas (O2) is obtained. Since 1 mole of any gas occupies 22.4 L at standard temperature and pressure (STP), we can use the stoichiometry of the reaction to determine the volume of oxygen gas produced.

Given that 50 cm³ of gas is obtained at the anode, we need to convert this volume to liters:

50 cm³ = 50/1000 L = 0.05 L

Using the stoichiometric ratio of the balanced equation, we find that 2 moles of water produce 1 mole of oxygen gas. Therefore, 0.05 L of oxygen gas is equivalent to:

0.05 L × (1 mole/22.4 L) = 0.002232 moles

Thus, the volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.

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Answer:

THE MOLAR MASS OF THE UNKNOWN MOLECULAR SUBSTANCE IS 200 G/MOL.

Explanation:

Mass of the unknown substance = 0.50 g

Freezing point of the solution = 3.9 °C

Freezing point of pure benzene = 5.5 °C

Freezing point dissociation constant Kf = 5.12°C/m

First, calculate the temperature difference between the freezing point of pure benzene and the final solution freezing point.

Change in temperature = 5.5 -3.9 = 1.6 °C

Next is to calculate the number of moles or molarity of the compound that dissolved.

Using the formula:

Δt = i Kf m

Assume i = 1

So,

1.6 °C = 1 * 5.12 * x/ 0.005 kg of benzene

x = 1.6 * 0.008 / 5.12

x = 0.0128 / 5.12

x = 0.0025 moles.

Next is to calculate the molar mass using the formula, molarity = mass / molar mass

Molar mass = mass / molarity

Molar mass = 0.50 g /0.0025

Molar mass = 200 g/mol

Hence, the molar mass of the unknown compound is 200 g/mol

Answer:

B I guess

Explanation:

this is because of gravity the path of the moon as it travels round the earth is very nearly a circle not elliptical though there are times in its orbit when it is closer to us and so appears slightly larger in the sky.

hope it's helpful!

In the atom, each 3p orbital has 4 lobes, due to the existence of the planar nodes present in that orbital (they conform 2 lobes), and also the spherical node, that allows the conformation of the other 2 lobes.

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:

81.72 +0.73=82.45

Explanation:

1

81.72

+0.73

= 82.45

82.72 + 0.73 = 82.45

Explanation:

0.72+0.73 = 1.45

Therefore 81+1.45= 82.45 ( Integer in addition with a decimal number).