A single piece of salt has a mass 0.583 g and was placed in a graduated cylinder which contained 4.02 mL oil, the volume increased to 4.22 mL. What is the density of the salt?

Answer:

algee

Explanation:

Answer:

the answer is b and if your seeing this hope you have a good live

Explanation:

BBBB

Student 2 employed the correct scientific reasoning which states that a TLC plate might be used to run an unknown drug, and the spots could then be compared to another TLC plate using known compounds.

Chromatography is a biophysical method used for the separation, identification, and purification of different compounds present in mixtures. The main separating components are stationary and mobile phases. TLC stands for thin-layer chromatography. It uses a TLC plate to separate compounds. A TLC plate is made by applying a thin layer of adsorbent on a sheet. It can be carried out on an analytical scale to track the development of a reaction or on a preparative scale to purify minute quantities of the compound. Because of its simplicity, comparatively low cost, great sensitivity, and rapid separation, TLC is an extensively used analytical method. Similar to all chromatography, TLC works on the premise that a compound will have varying affinities for the mobile and stationary phases, which will influence how quickly it migrates. TLC aims to produce well-defined, well-separated spots.

The question is incomplete. The complete question is as follows;

Three students are asked to discuss how thin-layer chromatography could be used to aid in the identification of a compound. which student employs correct scientific reasoning?

Student 1: An unknown compound could be used as the solvent in the TLC plate to determine its identity.

Student 2: An unknown compound could be run on a TLC plate and then the spots could be compared to separate TLC plates of known compounds.

Student 3: An unknown compound could be run on the same TLC plate as a known compound to see if they are the same chemical.

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132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.

The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.

The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12

The reaction is :

C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O

Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm

Molar mass of CO₂ is = 12+ 16*2 = 44gm

44gm of CO₂ is generated by 114 gm of C₈H₁₈

1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈

132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈

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Answer:

C

Explanation:

It was the first to show that the atom had no net charge.

According to the bohr model of the atom, the single electron of a hydrogen atom circles the nucleus is specific allowed orbits.

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Electrons are emitted from the surface of a metal in photoelectric effect.

The photoelectric effect is the emission of electron from the surface of a metal when light is shone on the surface..

For electrons to be emitted, the light must have a certain frequency known as threshhold frequency.

Therefore, electrons are emitted from the surface of a metal in photoelectric effect.

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To draw the Lewis structure for sulfate (SO₄²⁻) with minimized formal charges and determine the total likely resonance structures, follow these steps:

1. Identify the central atom: Sulfur (S) is the central atom in the sulfate ion.
2. Count the total number of valence electrons: Sulfur has 6, each oxygen has 6, and there are 2 extra electrons due to the 2- charge. So, the total number of valence electrons is 6 + 4(6) + 2 = 32.
3. Connect the central atom to the surrounding atoms with single bonds: Connect the sulfur atom to each of the four oxygen atoms using single bonds. This uses up 8 valence electrons (2 for each bond).
4. Distribute the remaining valence electrons to complete the octets of the surrounding atoms: 32 - 8 = 24 valence electrons are left. Distribute them to the four oxygen atoms to complete their octets (6 electrons for each oxygen atom).
5. Check for the need for multiple bonds to satisfy the octet rule for the central atom: Sulfur has 8 electrons around it (1 from each single bond), so the octet rule is satisfied.

Now, the Lewis structure is complete with minimized formal charges. However, there are multiple resonance structures for SO₄²⁻. Since sulfur can form double bonds with any of the four oxygen atoms, there are a total of 4 likely resonance structures for SO₄²⁻, with one double bond in each resonance structure and the remaining oxygen atoms having single bonds.

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Answer:

A

Explanation:

A sorry if not correct

When the change in system entropy contributes to an increase in reaction spontaneity, the sign of the Gibbs free energy change (ΔG) is negative.

The Gibbs free energy change is given by the equation ΔG = ΔH - TΔS, where ΔH is the change in enthalpy, T is the temperature, and ΔS is the change in entropy. For a reaction to be spontaneous, the Gibbs free energy change must be negative (ΔG < 0).

If the change in system entropy (ΔS) is positive, it means that the system has become more disordered or more random, which usually indicates an increase in the number of available states for the system. This increase in entropy tends to contribute to a decrease in the Gibbs free energy, making the reaction more spontaneous.

Therefore, when the change in system entropy contributes to an increase in reaction spontaneity, ΔS is positive, and the sign of ΔG is negative.

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Complete Question:

Give one word for the following.

a. An undesirable constituent of air

b. The constituent of air that helps in burning

c. The thick layer of air surrounding the earth

d. Carbon dioxide does not support this process​

Answer:

a. Pollutant.

b. Oxygen.

c. Atmosphere.

d. Combustion.

Explanation:

a. Pollutant: an undesirable constituent of air. Pollution can be defined as the physical degradation or contamination of the environment through an emission of harmful, poisonous and toxic chemical substances known as pollutants. Some examples of pollutant are carbon monoxide, nitrogen dioxide, ozone, etc.

b. Oxygen: the constituent of air that helps in burning. Oxygen is an element that aids in the combustion (burning) process because it is an oxidizing agent.

c. Atmosphere: the thick layer of air surrounding the earth. It comprises of nitrogen, oxygen, carbon dioxide, argon and other gases in very small proportion.

d. Combustion (burning): Carbon dioxide does not support this process but it is an end product of the process.

Combustion can be defined as an exothermic chemical reaction between physical substances, usually in the presence of oxygen and hydrocarbons to produce heat, light and carbon.

The s and p are the two sub shells which are added to find the number of valence electrons.

A valence electrons is defined as the negatively charged particles of an atom that must lose or gain to reach the inert gas electronic configuration. Valence electrons are located at the outermost shell of an atom.

Example: Oxygen which has an atomic number 8. And the electronic configuration of oxygen is 2,6 that means oxygen has 6 Valence Electrons in its outermost subshell. Out of 6, 2 Valence Electrons are in 2s subshell and 4 Valence Electrons are in 2p subshell.

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1.00 pint of milk is equal to 473.18 milliliters, based on the conversion factor of 1 pint = 473.18 milliliters.

To convert pints to milliliters, we can use the conversion factor of 1 pint = 473.18 milliliters.

Since we have 1.00 pints of milk, we can multiply it by the conversion factor to find the volume in milliliters:

1.00 pint * 473.18 milliliters/pint = 473.18 milliliters.

Therefore, 1.00 pint of milk is equivalent to 473.18 milliliters. It's important to note that this conversion factor is based on the standard definition of a pint, which is equal to 473.18 milliliters. In some countries, the pint may have a different value, so it's essential to use the appropriate conversion factor based on the specific context or region.

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The 33.46 ml of  0.0995 molar NaOH required to titrate 15 ml  of HCl solution to the equivalence point. Thus molarity of HCl is 0.22 molar.

Equivalence point in a titration is the point at which the titrant completely reacted with the analyte in the perfect stoichiometric ratio. Equivalence point can be identified using an indicator color change.

If we have M1 molar solution in V1 volume titrated with M2 molar solution of V2 volume, then we can write it as:

M1V1 = M2V2.

Here, the volume and molarity of NaOH is 33.46 ml and 0.0995 molar. The volume of HCl is 15 ml  where the molarity of HCl in this titration is :

molarity of  of HCL  = (volume of NaOH × molarity) / volume of HCl

                            = (0.0995 × 33.46 ml) /15

                            =0.22 M

Therefore, the molarity of HCl required in this titration is  0.22 M

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Answer:

Two

Explanation:

Answer:

Alkaline batteries are a type of primary battery prone to leaking potassium hydroxide.

Explanation:

A primary battery is a single-use battery; with the exception of some alkaline batteries, they cannot be recharged. Alkaline batteries are a type of primary battery designed as a direct replacement for dry cell batteries. They can deliver about three to five times the energy of a zinc-carbon dry cell battery of similar size. However, alkaline batteries are prone to leaking potassium hydroxide, so they should be removed from devices for long-term storage.

The correct answer is that an alkaline battery can deliver about thirty to fifty times the energy of a zinc-carbon dry cell of similar size. This is because alkaline batteries use a more efficient chemical reaction to produce electricity than zinc-carbon dry cell batteries.

It is important to note that primary batteries, including alkaline and zinc-carbon dry cell batteries, cannot be recharged and must be replaced when their energy is depleted. Additionally, while alkaline batteries are prone to leaking potassium hydroxide if left unused for a long time or if damaged, proper handling and storage can prevent this issue. Zinc-carbon dry cell batteries were not designed as direct replacements for alkaline batteries, but rather as a lower-cost alternative.

The correct statement among the given options is: alkaline batteries are a type of primary battery prone to leaking potassium hydroxide. Primary batteries, such as alkaline and zinc-carbon dry cell batteries, are designed for single-use and cannot be recharged. Alkaline batteries do have a higher energy capacity compared to zinc-carbon dry cells, but not 30-50 times more. Lastly, zinc-carbon dry cell batteries were not designed as direct replacements for alkaline batteries, as they have different chemistries and performance characteristics.

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Answer:

D. 3Mg + N2

Explanation:

magnesium nitride will decompose to form elemental magnesium and nitrogen gas

Mg₃N₂  → Mg + N₂

The reaction now needs to be balanced So that the number of Mg and N atoms in the reactants is equal to that of the products

The answer is D.

F P Al Ca K Cs

Answer: A patient refuses a treatment despite being fully informed of the consequences by the doctor.

Explanation: just did the assignment on edge 2020

Answer:

B

Explanation:

Answer:

24 pills

Explanation:

650 mg/1000 = 0.65 g

(There are 1000 mg in one g)

15.6g/0.65g=24

Answer:

I think you mean 0.025 M and this is the answer

Explanation:

The number of moles of sodium chloride (NaCl) that can be produced is:

4.5 moles Na * (2 moles NaCl / 2 moles Na) = 4.5 moles NaCl from 4.5 moles of sodium (Na), you can produce 4.5 moles of sodium chloride (NaCl) according to the balanced chemical equation.

The balanced chemical equation shows that 2 moles of sodium (2Na) react with 1 mole of chlorine (Cl₂) to produce 2 moles of sodium chloride (2NaCl). From the given information, we have 4.5 moles of sodium (Na). According to the stoichiometry of the balanced equation, we can determine the number of moles of sodium chloride (NaCl) that can be produced by using a simple mole ratio. Mole ratio of Na to NaCl: 2 moles NaCl / 2 moles Na Therefore, the number of moles of sodium chloride (NaCl) that can be produced is: 4.5 moles Na * (2 moles NaCl / 2 moles Na) = 4.5 moles NaCl Hence, from 4.5 moles of sodium (Na), you can produce 4.5 moles of sodium chloride (NaCl) according to the balanced chemical equation.

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Answer:

1,260 is your answer plz mark if this right

Explanation:

Answer:

1260

Explanation:

way to much

The radius of an atom of a chemical element is a measure of the atom's size. The meaning of it is said to be the typical distance, which is from the center of the nucleus to the boundary of the atom, which is surrounding the electrons.

Explanation :

To arrange the following in order of increasing radius: O2-, F-, Ne, Rb, and Br-, follow these steps:

1. Determine the number of protons and electrons for each species.
2. Compare their positions on the periodic table.

Here's a breakdown of the species with their protons and electrons:
- O2-: 8 protons, 10 electrons
- F-: 9 protons, 10 electrons
- Ne: 10 protons, 10 electrons
- Rb: 37 protons, 37 electrons
- Br-: 35 protons, 36 electrons

Now, let's compare their positions on the periodic table:
- O2-, F-, and Ne are all in the same period (row), so we'll compare their atomic numbers (protons) to determine their size. As we move across a period from left to right, the atomic radius decreases, so the order will be O2- > F- > Ne.
- Rb and Br- are in the same group (column). Going down a group, the atomic radius increases, so Rb > Br-.

Finally, we can combine these orders to get the overall order of increasing radius: O2- < F- < Ne < Br- < Rb.

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Answer:

I can confirm that 100 degrees Celsius is 373 degreed Kelvin

Explanation:

To be exact, 100°C = 373.15°K, but rounding down would then give us 373.

Answer: 2C2H2 + 5O2 → 4CO2 + 2H2O

Explanation:

The mass of ammonia that would be produced is 312.5 g

First, we will write a balanced chemical equation for the reaction

The balanced chemical equation for the reaction is

3H₂(g) + N₂(g) → 2NH₃(g)

This means

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia.

First, we will determine the number of moles of each reactant present

For Hydrogen (H₂)

Mass = 83.6 g

Molar mass = 2.016 g/mol

Using the formula

\(Number\ of\ moles = \frac{Mass}{Molar\ mass}\)

Number of moles of H₂ present = \(\frac{83.6}{2.016}\)

∴ Number of moles of H₂ present = 41.468254 moles

For Nitrogen (N₂)

Mass = 257 grams

Molar mass = 28.0134 g/mol

∴ Number of moles of N₂ present = \(\frac{257}{28.0134}\)

Number of moles of N₂ present = 9.174181 moles

Since,

3 moles of hydrogen gas reacts with 1 mole of nitrogen gas to produce 2 moles of ammonia

Then,

27.522543 moles of hydrogen gas will react with the 9.174181 moles of nitrogen gas to produce 18.348362 moles of ammonia

∴ 18.348362 moles of ammonia will be produced during the reaction

Now, for the mass of ammonia that would be produced

From the formula

Mass = Number of moles × Molar mass

Molar mass of ammonia = 17.031 g/mol

Mass of ammonia that would be produced = 18.348362 × 17.031

Mass of ammonia that would be produced = 312.49095 g

Mass of ammonia that would be produced ≅ 312.5 g

Hence, the mass of ammonia that would be produced is 312.5 g

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