a 5.00 gram sample of impure sodium oxalate required 36.91 ml of 0.100 m kmno4 to reach the endpoint. what was the percent purity of the sample?

The amount of the compound \(XY_2\) that can be generated would be 11.28 grams

From the equation of the reaction, the mole ratio of X and Y is 1:1.

Mole of 3.5 grams of X = 3.4/24 = 0.1417 moles

Mole of 4.2 grams of Y = 4.2/35 = 0.12 moles

Thus, Y is the limiting reactant because it is present in a lower amount than needed.

Mole ratio of Y and  \(XY_2\) = 1:1

Equivalent mole of  \(XY_2\) = 0.12 moles

Molar mass of  \(XY_2\) = 24 + (35x2) = 94 g/mol

Mass of 0.12 moles of  \(XY_2\) = 0.12 x 94 = 11.28 grams

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The assumed or arbitrary molarity of anions in the chemist's solution is found out to be 2.17 M.

Since neither the mass of magnesium bromide  and the volume of the volumetric flask are not given, one can assume arbitrary values and you could modify them whenever you want, thus, let 50.0g of magnesium bromide to be the measured out amount of solute and a 250-mL volumetric flask where the solution is prepared, so the final volume of the solution is 250 mL after the addition of distilled water. In this manner, the bromide anions moles, taking into account there are two bromide moles per magnesium bromide moles giving the value of 0.543 mols.

The molarity can be calculated as follows:

M= 0.543 mol Br-/0.250 L= 2.17 M

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He gas therefore has a pressure of **3.47 atm** at a volume of 0.505L and a temperature of 20.0°C.

The force created when gas particles strike the container wall is known as a gas's pressure. It is a gauge for a gas's moving molecules' typical linear momentum. The pressure exerted on the wall is normal to it and acts perpendicularly; the viscosity of the gas influences the force's tangential (shear) component.

Equation PV = nRT, where P is pressure, V is volume, n is the number of moles of gas, R is the universal gas constant, and T is temperature, expresses the ideal gas law. The pressure of He gas can be calculated by using this equation and the given values as replacements as follows:

P = nRT/V

in which n = 0.108 mol

The universal gas constant is R, which equals 0.08206 L atm mol K-1.

T (temperature in Kelvin) = 20.0 + 273.15 K

V = 0.505 L

By replacing these values in the previous equation, we obtain:

P is calculated as follows:

(0.108 mol) x (0.08206 L atm mol-1 K⁻¹) x (20.0 + 273.15 K) / (0.505 L).

P = 3.47 atm

He gas therefore has a pressure of **3.47 atm**1 at a volume of 0.505L and a temperature of 20.0°C.

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Answer:

3.2 kg

Explanation:

f=ma

16=m*5

16/5=m

3.2

Answer:

c.

earthquakes along the fault were more frequent in the south than in the north

The natural types of greenhouse gases are more difficult to control and eliminate while the human-made type are easier.

Greenhouse gases are specific type of gases that have the ability to trap and release heat in their bonds.

Greenhouse gases are the cause of global warming, which is the gradual increase in temperature of the Earth's atmosphere.

However, greenhouse gases can either occur naturally or be synthesized artificially. The naturally-occuring greenhouse gases like CO2 are more difficult to control because they are not produced by humans.

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Answer:

Sex cells are different in body cells because the sex cells are eggs while body cells are formed.

Answer:

An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.

Explanation:

When the reaction is subjected to pressure, the equilibrium will shift to the side with fewer gas molecules, which is the left side. Therefore, the answer is c. left.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will respond by shifting in a way that reduces the effect of the change. In this case, increasing the pressure would cause the equilibrium to shift towards the side with fewer gas molecules to alleviate the increase in pressure.

Since there are fewer gas molecules on the left side of the reaction (2 CO + O2), the equilibrium will shift to the left to reduce the total number of gas molecules. This means that the concentrations of CO and O2 will increase, while the concentration of CO2 will decrease until a new equilibrium is established. Thus, the equilibrium will shift to the left.

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There are two molecular orbitals are needed to form one bonding molecular orbital and one anti-bonding molecular orbital.

Bond orbitals Electrons that spend most of their time between the nuclei of two atoms are placed in bonding orbitals, and electrons that spend most of their time outside the nuclei of two atoms are placed in anti-bonding orbitals.

Adding up the same number of atomic orbitals gives the same number of molecular orbitals. Two atomic orbitals combine to form two molecular orbitals. An anti-bonding orbital is essentially the opposite of a bonding orbital. They form when atomic orbitals combine in ways that lead to almost destructive interference.

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When the given half-reaction HAsO2 + H2O ⟶ H3AsO4 + H+ is balanced under acidic conditions, the coefficients of the species are:

HAsO2 + 2H2O ⟶ H3AsO4 + 2H+

To balance the half-reaction under acidic conditions, we need to ensure that the number of atoms and charges is balanced on both sides.

First, we balance the oxygen atoms by adding water (H2O) molecules to the side lacking oxygen. In this case, two water molecules are added to the left side:

HAsO2 + 2H2O ⟶ H3AsO4

Next, we balance the hydrogen atoms by adding protons (H+) to the side lacking hydrogen. In this case, two protons are added to the right side:

HAsO2 + 2H2O ⟶ H3AsO4 + 2H+

The balanced equation shows that on the left side, there is one HAsO2 molecule, which is oxidized, and on the right side, one H3AsO4 molecule and two protons (H+) are formed. Therefore, the coefficients of the species are 1, 2, 1, and 2 for HAsO2, H2O, H3AsO4, and H+, respectively.

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Considering the definition of atomic mass, isotopes and atomic mass of an element, the percentage abundance of the isotope Interactium-295 is 34% and the relative atomic mass for Interactium is 289.42 amu.

The atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.

Isotopes are those chemical elements formed by different atoms, that is, their atomic numbers are the same, but the number of neutrons is different.

The atomic mass of an element is the weighted average mass of its natural isotopes and it usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.

In this case, you know that:

You know that since there are three isotopes, the relative abundance of each one has to combine to 100%. This means that the abundance of the isotope Interactium-295 must be calculated by:

abundance of Interactium-283 + abundance of Interactium-289 + abundance of Interactium-295= 100%

27% + 39% + abundance of Interactium-295= 100%

abundance of Interactium-295= 100% - 27% - 39%

abundance of Interactium-295= 34%

Finally, the percentage abundance of the isotope Interactium-295 is 34%.

In this case, you know that:

The relative atomic mass for Interactium can be calculated as:

relative atomic mass=283 amu× 0.27 + 289 amu× 0.39 + 295 amu× 0.34

Solving:

relative atomic mass= 289.42 amu

Finally, the relative atomic mass for Interactium is 289.42 amu.

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The credit for discovering the periodic table of elements goes to the Russian chemist Dmitri Mendeleev. He was born in Tobolsk, Siberia in 1834 and lived until 1907.

Mendeleev is recognized as the father of the modern periodic table because of his work in organizing and categorizing the elements based on their chemical properties.

In 1869, Mendeleev published his periodic table, which arranged the known elements in order of increasing atomic weight and grouped them by their chemical properties. He left gaps in the table for elements that had not yet been discovered, predicting their properties based on the patterns he observed in the known elements.

Mendeleev's work revolutionized chemistry and led to a better understanding of the relationships between the elements. His periodic table formed the basis for future discoveries in chemistry and is still used today in modern science.

In conclusion, Dmitri Mendeleev is credited with discovering the periodic table of elements and his contributions to the field of chemistry have had a lasting impact on science.

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Answer:

1.26666.....

Explanation:

Density is = to mass/volume

Answer: 19/15 in decimal form 1.267

Explanation:

when solving for density you divide mass by volume, when solving vor volume divide density and mass, finding mass multiply density and volume

Answer:

Earthwares

porcelain

bricks

Dehydration reactions are those chemical processes that remove a water molecule from the reactant molecule. Dehydration synthesis is the process of combining two compounds while removing water molecules. Here the loss of water molecules is the final step of dehydration of 2-methyl cyclohexanol.

Through an E₁ elimination, 2-methyl cyclohexanol is dehydrated. The protonation of the hydroxy group by the acid catalyst results in the formation of a good leaving group and a water molecule that is neutral. A carbocation is created when the water separates on its own. This carbocation quickly gets rid of a beta-proton to create a double bond.

1-methyl cyclohexene is the main byproduct of the dehydration of 2-methyl cyclohexanol. Two alkene compounds, 1-methyl cyclohexene, and 3-methyl cyclohexene, are produced when 2-methyl cyclohexanol is dehydrated.

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Answer:

propel tractors

Explanation:

The coefficients needed to balance the redox reaction are: 2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction requires two molecules of chlorine gas to react with one atom of iron, producing one Fe3+ ion and two chloride ions. We need to balance both the mass and charge on each side of the equation.

Step 1: Balance the atoms other than oxygen and hydrogen.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq)

Step 2: Balance the oxygen atoms by adding water (H2O) molecules.

Fe(s) + Cl2(g) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 3: Balance the hydrogen atoms by adding hydrogen ions (H+).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l)

Step 4: Balance the charges by adding electrons (e-).

Fe(s) + Cl2(g) + 6H+(aq) -> Fe3+(aq) + 2Cl-(aq) + H2O(l) + 6e-

The balanced equation for the redox reaction is:

2Fe(s) + 3Cl2(g) + 6H+(aq) -> 2Fe3+(aq) + 6Cl-(aq) + 3H2O(l)

The balanced redox reaction is 2 Fe(s) + 3 Cl2(g) -> 2 Fe3+(aq) + 6 Cl-(aq) with coefficients 2, 3, 2, and 6 respectively.

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Answer:

Earthquake...

Explanation:

I mean, its kinda the only one that makes sense aha

And took test!

The word earthquake identifies the shaking that results from movement under Earth's surface.

Hence, option 1 is the answer.

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When a negative ion enters the cell through an ion channel, it causes hyperpolarization, resulting in a more negative membrane potential. This makes it more difficult for the membrane potential to reach the threshold for an action potential.

When a negative ion enters the cell through an ion channel, it causes hyperpolarization of the membrane potential. Hyperpolarization is a change in the membrane potential where the inside of the cell becomes more negative than the resting membrane potential.

This occurs because the entry of negative ions, such as chloride (Cl⁻), increases the negative charge inside the cell, making it more difficult for the membrane potential to reach the threshold for an action potential.

On the other hand, the exit of a positive ion, such as sodium (Na⁺), results in depolarization. Depolarization is a change in the membrane potential where the inside of the cell becomes less negative or even positive compared to the resting membrane potential.

This occurs because the exit of positive ions reduces the positive charge inside the cell, making it easier for the membrane potential to reach the threshold for an action potential.

Therefore, the correct matching is the entry of a negative ion, which leads to hyperpolarization of the membrane potential.

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Which ion channel action is correctly matched with its resulting change in membrane potential? exit of a positive ion: depolarization exit of a negative ion; hyperpolarization entry of a positive ion, hyperpolarization entry of a negative ion; hyperpolarization activation of sodium-potassium transporters; depolarization

Answer: First one is slump, then mudflow, then landslide.

Explanation:

Just got it right on e2020

Answer:

First one is slump, then mudflow, then landslide.

Explanation:

plz give me a Brainliest

Amount of nitrogen produced = 1.624 g

To calculate the moles, we use the equation:    

4NH3(g) + 3 O2 (g) ---> 2 N2 (g) + 6 H2O (g)                           ....(1)

For ammonia:

Putting values in above equation, we get:

Moles of ammonia = 7.00 x 1022 / 6.023 * 10 ^23 = 0.116 mol

Moles of oxygen = 6.00 x 1022 / 6.023 * 10 ^23 = 0.099 mol

For the reaction:

4NH3(g) + 3 O2 (g) ---> 2 N2 (g) + 6 H2O (g)

By Stoichiometry of the reaction,

4 moles of ammonia combine with 3 moles of Oxygen

Thus 0.116 moles of ammonia will combine with= 3/4 * 0.116 = 0.087 of oxygen

Thus ammonia is the limiting reagent as it limits the formation of product.

4 moles of ammonia produces 2 moles of nitrogen

0.132 moles of ammonia will produce=2/4 * 0.116 = 0.058 of nitrogen

Molar mass of nitrogen =  28 g/mol

Amount of nitrogen produced=

No of moles * molar mass = 0.058 * 282 = 1.624 g

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Answer:

1.Frequency

2.Amplitude

3.Wavelength

4.Medium

5.Back and Forth

6.Up and Down

Explanation:

CORRECT ME IF I'm wrong

The amount of AlCl3 that may be created from 22.0g of Al is shown by this equation.

22.0g Al multiplied by (1 mol Al/26.98g) by (2 mol AlCl3/2mol Al) by (133.34 g/1mol AlCl3) results in 108.66g AlCl3.

This equation illustrates the amount of AlCl3 that may be created from 27.0g of Cl2.

33.87g AlCl3 is obtained by multiplying 27.0g Cl2 by (1 mol Cl2/70.91g) x (2mol AlCl3/3 mol Cl2) x 133.34g.

This demonstrates that the limiting reactant is chlorine. The maximum amount of AlCl3 that can be created before the chlorine runs out is 33.87 grams.

The solution, using significant digits, is 33.8g of AlCl3.

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Answer:

Si4Br8

Explanation:

The chemical names are formed with prefix and suffix with helps in the formation of chemical formula. Example of prefix are mono- means one, “di-” means two, and “tri-” is three" and suffix are  "ide". Prefix represents the number of elements present in the compound and so help in formation of chemical formula.

The formula for Tetrasilicon octabromide is Si4Br8 as "tetra" used as prefix which represents that there are 4 element of silicon present in the compound and "octa" used as prefix in bromide represents that there are 8 element of bromide present in the compound.

Hence, the correct answer is "Si4Br8".

The mass of a substance is the product of its density and volume. Thus, the   mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.

Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.

Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.

It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25  dm³. Thus the mass can be calculated as follows:

density = mass/volume

 mass   = density × volume

             = 0.25  dm³  ×  125 mg/dm³

             = 31.25 mg

Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.

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The changes are classified as follows:

1: Chemical change -  The addition of the water to quicklime

2: Physical change - The melting of candle wax

3: Physical change -  The change in colour of zinc oxide from white to yellow and vice versa during heating and after cooling, respectively

4: Physical change- The dissolution of common salt

5: Chemical change - The hardening of cement by the absorption of carbon (Iv) oxide​

1: The addition of water to quicklime (slaking of lime) is a chemical change. It involves a chemical reaction between calcium oxide (quicklime) and water to form calcium hydroxide (slaked lime). This reaction is exothermic and produces heat.

2: The melting of candle wax is a physical change. It involves a phase transition from a solid state to a liquid state due to the application of heat. The chemical composition of the wax remains unchanged during this process.

3: The change in color of zinc oxide from white to yellow and vice versa during heating and cooling is a physical change. It is a reversible process caused by the alteration of the crystal structure of zinc oxide. The change in color is due to the absorption or release of energy during the heating and cooling processes, respectively.

4: The dissolution of common salt (sodium chloride) is a physical change. It involves the separation of ionic bonds between sodium and chloride ions in the solid salt and their subsequent dispersal in water. The chemical composition of the salt remains the same; it simply forms a homogeneous mixture with water.

5: The hardening of cement by the absorption of carbon dioxide (CO2) is a chemical change. It involves a chemical reaction known as carbonation, where carbon dioxide reacts with the calcium hydroxide in cement to form calcium carbonate. This reaction leads to the formation of new chemical compounds and a change in the structure and properties of the cement, resulting in its hardening or curing process.

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Answer:

water,minerals carbon dioxide, and oxygen

Explanation:

We answered it on my little brothers quiz, and we got a 100%!!!

Answer:

Standard pressure is always 1.00atm. Example #1: How many moles of oxygen will occupy a volume of 2.50 L at STP? Standard temperature = 273K law.

Explanation:

Answer:

2.07 atm

Explanation: