-Suppose a sample needs to consume 0.02m mol KIO3 to reach the endpoint, theoretically, the solution must have at least how much grams of KI?
-A student is supposed to add 5 mL KI solution into the sample, but, due to a mistake, the student added 5.1 mL KI solution. Will the mistake affect the calculated concentration of ascorbic acid? If yes, higher or lower? Explain.
-Describe in detail the steps of a quantitative transfer. In this experiment, you are required to weight your sample in a 50 mL beaker and quantitively transfer and dilute it in a 10.00 mL volumetric flask. Be specific when describing the quantity of water used and the tools you will need.

Answer:

Arsenic

Explanation:

according to my school

Based on the properties of elements in the periodic table arsenic (As)  is the weakest conductor of electricity.

In the periodic table, all the 118 known elements are arranged in order depending on their properties.

Certain trends can be observed among elements in the periodic table. One of them is the trend of electrical conductivity.

Electrical conductivity decreases across the period as metallic properties decrease.

As such arsenic (As) is the least metallic element in the list and is the weakest conductor of electricity.

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Answer:

water because the other two were formed through a chemical process

The top 10 periodic table elements that most students are excited to learn about are listed below. Carbon. Nitrogen is the atomic code for carbon, or C.

A crucial component of a whole. an ordinary substance whose cannot be divided into smaller components or transformed into another substance is referred to as in chemistry. Atoms, which are made up of protons, neutrons, and electrons, are the building blocks of an element.

Chemical substances that cannot be converted into other chemicals are referred to as elements. Chemical elements are distinguishable from one another by the number of of protons in their atoms' nucleus, which is the fundamental particle that makes up a chemical element.

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Answer:A

Explanation:

gentle slope

Rust is known as Iron (III) Oxide according to the IUPAC, and its chemical formula is Fe2O3.

Iron rusting is a chemical change since it involves the interaction of two substances to create a new one. Iron oxide is created during the rusting process by the reaction of iron and oxygen molecules.

Rust is described as the reddish brown layer that frequently develops on particular kinds of metal. These metals rust when they are exposed to air and moisture. The red material is created as a result of this combination's chemical reaction.

Rust's scientific name is iron oxide; its chemical formula is \($${Fe_2O_3}\). Metals that rust are those made of iron or iron alloys like steel. A chemical reaction takes place over time when iron comes into touch with airborne oxygen and water. This reaction creates iron oxide as a new chemical. The reddish hue of Mars is due to the abundance of iron oxide, which is present in nature and also on Mars.

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Answer:

it should be C

Explanation:

the top guy is right

Answer:

"The strength of ionization decreases as the proportion including its protons to the excited electrons" is the right solution.

Explanation:

This question seems incomplete. I believe the answer choices are as followed:

O The ionization energy decreases because the ratio of the protons to electrons increases.

O The ionization energy increases because the ratio of the protons to electrons increases.

O The ionization energy decreases because the ratio of the protons to electrons decreases.

O The ionization energy increases because the ratio of the protons to electrons decreases.

The answer to this is The ionization energy increases because the ratio of the protons to electrons increases. (2nd option).

When a weak base is titrated with a strong acid, the equivalence point is: a weak acid's formation.

The equivalence point happens when the moles of the acid equal the moles of the weak base, and pH = 7. It is because the hydronium ion concentration is identical to the hydroxide ion concentration in pure water at this pH. The pH of a weak base solution can be measured during titration.

The reaction between weak bases and strong acids happens in two steps. The first step is the formation of salt through the reaction between acid and base, and the second step is the hydrolysis of this salt. Anions derived from weak bases react with water and accept protons to produce hydroxide ions.

On the other hand, the cations derived from strong acids do not hydrolyze to produce acidic solutions. They can neither react with the acid nor the water, so the only effect is an increase in the concentration of cations in the solution.

The weak base's concentration before and after the equivalence point is much less than the weak acid concentration that is produced at the equivalence point. During the titration, the pH increases slowly initially, but it rises rapidly near the equivalence point, where the weak acid is produced.

After the equivalence point, the pH of the solution is lower because the excess of strong acid has changed the buffer solution into a weak acid solution.

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Assume that every gas in the list will act perfectly. Using the mole fraction of O2 and the specified pressure, the partial pressure of O2 may be computed (P).

What is specified?

The following diagram illustrates the mathematical link between partial pressure of oxygen (P1) and oxygen mole fraction (X1):

P₁=X₁P

By dividing the total number of moles of gases (0.76 + 0.18 + 0.031 + 0.026) by the number of moles of O2 (0.18 mol), it is possible to determine the mole fraction of O2 as follows:

X₁= 0.18 / (0.76+0.18+0.031+0.026)= 0.1805

In this manner, the partial pressure of O2 (P1) is determined:

P1=0.1805x739mmHg, or 133.4mmHg

According to the estimate above, the partial pressure of oxygen is almost equal to 130 mm Hg. As a result, option C is the best one.

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Answer:

C. Net force

Explanation:

Explanation: A river drainage basin is an area drained by a river and all of its tributaries. A river basin is made up of many different watersheds. A watershed is a small version of a river basin. Every stream and tributary has its own watershed, which drains to a larger stream or wetland.

The component of a river system is made of stream and small rivers that feed into a large river is tributaries. The component of a river system also called a drainage system is watersheds. The component of a river system is a ridge between water flowing in two directions is divided.

Tributaries are the small rivers or streams that are made from the big or main river.

Watershed is the place where the rainwater from all river lines come to a point.

Thus, the correct options are tributaries, watersheds, and divided.

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The thermal decomposition of sodium bicarbonate involves breaking down the compound into its component parts, including Na2CO3, H2O, and CO2.

What is Thermal Decomposition?

Thermal decomposition is a chemical reaction in which a substance is broken down into simpler substances or elements by heating it. This process is typically carried out in the absence of air or oxygen, which can cause the substance to burn or react with other substances.

The balanced chemical equation that best represents the thermal decomposition of sodium bicarbonate is 2 NaHCO3 → Na2CO3 + H2O + CO2.

Evidence: According to the data tables, 4.00 g of sodium bicarbonate (NaHCO3) was heated, resulting in a product with a mass of 2.30 g. Stoichiometry calculations were then performed to determine the expected masses of the possible products, assuming they were formed in stoichiometric quantities based on different balanced chemical equations. The expected mass of Na2CO3 for the balanced chemical equation 2 NaHCO3 → Na2CO3 + H2O + CO2 was calculated to be 1.90 g, which is the closest match to the actual measured mass of the product.

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The amount of time taken to produce 10 g Bi by the electrolysis of a BiO solution using a current of 25 A is 9.2 minutes.

Direct electric current is used in the electrolysis process to accelerate chemical reactions that would not naturally occur. As a step in the electrolytic cell-based separation of elements from naturally existing sources like ores, electrolysis is significant from a commercial standpoint.

In BiO+, Bi has an oxidation number of 3+, so it’ll take 3 moles of electrons per mole of Bi.

10.0 g Bi x 1 mole/209g = 0.0478 moles Bi

0.0478 moles Bi x 3 moles electrons/mol Bi = 0.1434 moles electrons

0.1434 mol e- x 96,485 C/mole = 13836 Coulombs

1 C = 1 amp/sec

13836 C = 25 A x time

time = 553 seconds = 9.2 minutes

To produce the bio solution using a current is 9.2 minutes.

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It would take approximately 185 seconds, or just over 3 minutes, to produce 10.0 g of bismuth by the electrolysis of a bio solution using a current of 25.0 A.

To determine the time it would take to produce 10.0 g of bismuth by the electrolysis of a bio solution using a current of 25.0 A, we need to use Faraday's law.

First, we need to find the number of moles of bismuth required to produce 10.0 g. The molar mass of bismuth is 208.98 g/mol, so:

10.0 g Bi / 208.98 g/mol = 0.0478 mol Bi

Next, we can use Faraday's law, which states that the amount of product produced is proportional to the amount of charge (in Coulombs) passed through the solution. The equation is:

moles of product = (charge in Coulombs) / (Faraday's constant)

where the Faraday's constant is 96,485 C/mol e-.

We can rearrange this equation to solve for the charge:

charge = (moles of product) x (Faraday's constant)

Plugging in the values we found earlier, we get:

charge = 0.0478 mol Bi x 96,485 C/mol e- = 4,632 C

Finally, we can use the formula for current:

current = charge / time

Rearranging this equation to solve for time, we get:

time = charge / current

Plugging in the values we found earlier, we get:

time = 4,632 C / 25.0 A = 185 s

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Answer:  the number of grams of AgNO3 present in its 7.4 moles is 1257.

When we have an ionic compound, we have elements with different charges, cations are known for the + charges being carried by them, in this group of elements we found the metals. Within this group of elements, we have monovalent cations (Cs+ for example), divalent cations (Ca2+), but in the transition metals we find multivalent or polyvalent ions, like Fe, that can be Fe2+, Fe3+, and Fe4+, so these elements are able to carry different charges as cations, more examples of these multivalent ions are Copper, Zinc, Manganese, and many more.

C. No Reaction will be the products when CuF2 reacts with Li

The positive and negative ions of two ionic compounds switch positions to generate two new compounds in a process known as a double replacement reaction. In aqueous solution, double-replacement reactions often take place between compounds.

In conclusion, you cannot balance a reaction by modifying or adding new components. To ensure that mass is preserved, the only thing you can do is alter the quantity of particles, or moles of particles, involved.

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Answer:

The answer is

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

From the question

mass of alcohol = 100 g

density = 0.79 g/mL

The volume is

\(volume = \frac{100}{0.79} \\ = 126.58227848...\)

We have the final answer as

Hope this helps you

Answer:

No, scientists did not accept Wegener's theory

Explanation:

In a book titled; "The Origin of Continents and Oceans", published in 1915, Wegener introduced his ideas about the theory of continental drift.

According to his idea, "all the continents were once joined together in an "Urkontinent" before breaking up and drifting to their current positions"(live science).

Though some of his ideas were correct, some of them were also quite wrong. Scientists rejected his idea because he did not detail any mechanism by which the continental drift occurs.

Answer: 40.3

Explanation:

In the reaction, we see that for every 3 moles of oxygen gas consumed, 2 moles of rust are formed.

So this means that if 60.5 moles of oxygen gas are consumed, then (60.5/3)(2)=40.3 moles of rust can be formed.

The plant most likely absorb from the water for the process that produces the oxygen gas is Carbon Dioxide .

What is photosynthesis ?

Photosynthesis is defined as the processes that bring about the manufacturing of food by green plants.

Food is complex energy-rich organic matter which living organisms feed on to obtain nutrients, substances necessary for life. Green plants which are known as autotrophs has the ability to produce their own food through the process of photosynthesis.

The main features of photosynthesis include:

It takes place in the chloroplasts of plants, in the presence of sunlight.

The energy needed for the process is gotten from sunlight which is absorbed by chlorophyll found in the chloroplasts.

The raw materials used are low-energy containing inorganic compounds, example: carbon dioxide and water.

The final products are high-energy containing sugars. oxygen is given off as a waste product.

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Answer:

Na

Explanation:

Answer:

It is Rb!!

for plato users

Answer:

Nitrogen (N)

Atomic number – 7

mass number – 14

Electronic configuration – 2,5

Explanation:

mark as brainliest

Answer:

nickel, cobalt would decrease in size when it became an iron

To determine the density of NH3 gas at 435 K and 1.00 atm, we can use the ideal gas law equation:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature.

First, we need to find the number of moles of NH3 gas:

n = PV/RT

n = (1.00 atm) x V / [(0.08206 L atm/mol K) x (435 K)]

Assuming the volume of NH3 gas is 1 L:

n = (1.00 atm) x (1 L) / [(0.08206 L atm/mol K) x (435 K)]
n = 0.0276 mol

Next, we can use the formula for density:

density = mass/volume

To find the mass of NH3 gas, we can use its molar mass of 17.03 g/mol:

mass = n x molar mass
mass = 0.0276 mol x 17.03 g/mol
mass = 0.47 g

Therefore, the density of NH3 gas at 435 K and 1.00 atm is:

density = mass/volume
density = 0.47 g/1 L
density = 0.47 g/L
To determine the density of NH3 gas at 435 K and 1.00 atm, we can use the Ideal Gas Law formula, which is PV = nRT. Here's a step-by-step explanation:

1. Write down the given information:
  - Temperature (T) = 435 K
  - Pressure (P) = 1.00 atm
  - We also need the molar mass of NH3, which is 14.01 (N) + 3 * 1.01 (H) = 17.03 g/mol

2. Rearrange the Ideal Gas Law formula to solve for the number of moles (n) in one liter of NH3 gas:
  - n = PV/RT

3. Substitute the given values:
  - n = (1.00 atm) * (1 L) / (0.0821 L·atm/mol·K) * (435 K)
  - n ≈ 0.0279 mol/L

4. Calculate the mass of NH3 in one liter:
  - Mass = n * molar mass
  - Mass = 0.0279 mol/L * 17.03 g/mol ≈ 0.475 g/L

5. Determine the density of NH3 gas:
  - Density = Mass / Volume
  - Density ≈ 0.475 g/L / 1 L ≈ 0.475 g/L

So, the density of NH3 gas at 435 K and 1.00 atm is approximately 0.475 g/L.

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Answer:

Is there a question you need help with?

hypoglycemic agents.

Insulin, tolbutamide (orinase), chlorpropamide (diabinase), rosiglitazone (avandia), and metformin (glucophage) are examples of hypoglycemic agents.

Type-2 diabetes mellitus is treated with synthetic medications called hypoglycemic agents, which lower blood glucose levels.

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We should add approximately 600 mg of magnesium sulfate to the one-liter IV solution to achieve the desired concentration.

The first step to convert mEq to milligrams is to know the atomic weight of magnesium, which is 24.3. To get 10 mEq of magnesium ion per liter, we need to add 1,203 milligrams of magnesium sulfate (10 x 24.3 x 2 x 1000 / 1) to a one liter IV solution. Therefore, the answer is 1,203 milligrams of magnesium sulfate should be added to the IV solution. Remember to always round to the nearest whole number in this case, so the answer would be 1,203. The MEW of MgSO₄ is its molecular weight (120) divided by the valence of Mg²⁺ (2). Thus, MEW = 120 / 2 = 60. Next, multiply the desired milliequivalents (10 mEq) by the MEW (60) to obtain the required amount in milligrams: 10 mEq x 60 mg/mEq = 600 mg. Therefore, you should add approximately 600 mg of magnesium sulfate to the one-liter IV solution to achieve the desired concentration.

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Based on the given information, the unknown substance that is solid at room temperature, dissolves in water but not in oil, and conducts electricity is likely KCl (potassium chloride).

Firstly, KCl is a compound that exists as a solid at room temperature. It forms a crystalline structure with a high melting point, which is consistent with the property of being a solid.

Secondly, KCl is highly soluble in water but not in oil. This property is attributed to the ionic nature of KCl. When KCl is dissolved in water, the K+ and Cl- ions dissociate and become surrounded by water molecules through the process of hydration.

Lastly, KCl is an electrolyte and conducts electricity when dissolved in water. In aqueous solution, the K+ and Cl- ions are free to move and carry electric charge. This ability to conduct electricity is a characteristic property of ionic compounds, which further supports the identification of the unknown substance as KCl.

Alcohol, on the other hand, is typically a liquid at room temperature and does not conduct electricity when dissolved in water. Chlorine gas is a gas at room temperature and does not dissolve in water.

Therefore, based on the given properties, the most likely compound for the unknown substance is KCl.

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Answer:

8.8g of Al are necessaries

Explanation:

Based on the reaction, 2 moles of Al are required to produce 3 moles of hydrogen gas.

To solve this question we must find the moles of H2 in 11L at STP using PV = nRT. With these moles we can find the moles of Al required and its mass as follows:

Moles H2:

PV = nRT; PV/RT = n

Where P is pressure = 1atm at STP; V is volume = 11L; R is gas constant = 0.082atmL/molK and T is absolute temperature = 273.15K at STP

Replacing:

1atm*11L/0.082atmL/molK*273.15K = n

n = 0.491 moles of H2 must be produced

Moles Al:

0.491 moles of H2 * (2mol Al / 3mol H2) = 0.327moles of Al are required

Mass Al -Molar mass: 26.98g/mol-:

0.327moles of Al * (26.98g / mol) = 8.8g of Al are necessaries