Can someone please help me? :(

The soluble impurities removed during recrystallization is through the suction filtration.

The Soluble impurities are removed during the recrystallization through the suction filtration. The Suction filtration makes use of the specialized equipment called as the Buchner flask and the Buchner funnel. The mixture that is containing the recrystallized compound is then poured on the Buchner funnel that is containing a filter paper.

The filtrate that contains the soluble impurities will flows through the holes made in the funnel to the Buchner flask and the process of that is mediated by the pumping air onto the adaptor using the aspirator. The crystals and then washed with the cold solvent to prevent is to the dissolution.

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Answer:

0.067 ton/Litre.

Explanation:

645 Newtons per quart to tons per liter.

We'll begin by converting 645 Newton/quart to gram/quart (g/q). This can be obtained as:

1 N/q = 100 g/q

Therefore,

645 N/q = 645 N/q × 100 g/q / 1 N/q

645 N/q = 64500 g/q

Therefore, 645 Newton/quart is equivalent to 64500 grams per quart.

Next, we shall convert 64500 grams per quart to pounds per quart. This can be obtained as follow:

454 g/q = 1 pound/q

Therefore,

64500 g/q = 64500 g/q × 1 p/q / 454 g/p

64500 gram/quart = 142.07 pound/quart

Therefore, 64500 gram/quart is equivalent to 142.07 pound/quart.

Next, we shall convert 142.07 pound/quart to ton/quart. This can be obtained as follow:

2000 p/q = 1 ton/q

Therefore,

142.07 p/q = 142.07 pq × 1 ton/q / 2000 p/q

142.07 pound/quart = 0.071 ton/quart

Therefore, 142.07 pound/quart is equivalent to 0.071 ton/quart.

Finally, we shall convert 0.071 ton/quart to ton/litre. This can be obtained as follow:

1 ton/q = 1/1.06 ton/L

Therefore,

0.071 ton/q = 0.071 ton/q × 1/1.06 ton/L / 1 ton/q

0.071 ton/quart = 0.067 ton/Litre

Therefore, 0.071 ton/quart is 0.067 ton/Litre.

From the above illustration, 645 Newton/quart is equivalent to 0.067 ton/Litre.

The possible molecular formula of the compound is C3H6.

What is molecular formula?

The  molecular formula is an expression of  that defines the number of the  atoms of each element in one of the  molecule of a compound. It is  shows the actual number of each atom in a molecule.

Sol-

Let's take the mass weight of compound= 42g

As per the given question

The empirical formula is CH2.

Empirical weight of CH2 = 12 + (1 × 2) = 12 + 2 = 14

Mass of one mole of the compound = its molecular weight = 42

n = Mol. wt. / Empirical formula wt.= 42 / 14 = 3

So,Mol. formula = ( Empirical formula) × n

Thus the answer is

= (CH2) × 3 = C3H6

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When an acid dissolves in water, the solute present in the solution is \(H^{+}\) ions as they are released by the acid molecules. This is a characteristic of all acidic solutions.

When an acid dissolves in water, the acid molecules ionize to release \(H^{+}\) ions (also known as hydronium ions, \(H_{3}O^{+}\)).  The H+ ions are the solute present in the solution of an acid dissolved in water. . Some examples of acidic solutions are hydrochloric acid (HCl), sulfuric acid (\(H_{2}SO_{4}\)), and nitric acid (\(HNO_{3}\)).

The concentration of \(H^{+}\) ions in an acidic solution determines the acidity of the solution. Acids have a pH less than 7. The more the concentration of \(H^{+}\) ions, the stronger the acid is, and the lower the pH of the solution. The concentration of \(H^{+}\) ions in a solution can be measured using a pH meter or pH paper.

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5 electrons

Boron atomic number 5 has five electrons in its ground state.

Commonly Boron will lose 3 electrons leaving 2 electrons in its most common ionic form.

Explanation:

The atomic number gives the number of protons. Protons which have a positive charge are balanced by an equal number of electrons in a neutral atom.

Boron number 5 has five protons and therefore as a neutral atom also has five electrons.

Boron has an electron configuration of

1s22s22p1

The most stable electron configuration for Boron is

1s2

+ 3 charges. By losing three electrons Boron can achieve the stable electron structure of Helium

Brainliest? :D

The most electronegative element on the periodic table is fluorine. It always displays the oxidation states of 1 and 1, whereas other halogens display the oxidation states of 1, +1, +3, +5, and 7. They exhibit a high oxidation state when the d-orbital is unoccupied. However, fluorine does not exhibit a high oxidation state because it lacks a vacant d-orbital.

The chemical element fluorine has an atomic number of 9 and the symbol F. The lightest halogen, it is an extremely poisonous, pale yellow diatomic gas under normal conditions. It is exceedingly reactive and, as the most electronegative element, reacts with all other elements with the exception of argon, neon, and helium.

Since fluorine is the most electronegative element, its oxidation state always displays one. It starts out with seven valence electrons and adds one more to form an octet. Fluorine now has an oxidation state of 1. They exhibit a high oxidation state when the d-orbital is unoccupied. However, fluorine does not exhibit a high oxidation state because it lacks a vacant d-orbital.

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The half-life in years of Neptunium-237 which was the first isotope is 2.1 \(10^{6}\) years.

Neptunium is most stable and Neptunium-237 is undergoes alpha decay, it means Neptunium-237 is decays by the emission of alpha particles . Seven alpha particles is emitted during decay of  Neptunium-237.  Neptunium-237 is radioactive actinide  elements and first  transuranium element.

The transuranium synthesis process involves creating a transuranium element through the transmutation process . The transmutation process  is the process of creating heavy elements from light elements. Hence the process is the transmutation of light elements. There are two types: artificial and natural transmutation.

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Answer:

Here are some examples of deliquescent, hygroscopic, anhydrous, hydrated, and salts with water of crystallization:

Deliquescent salts:

Calcium chloride (CaCl2): It absorbs moisture from the air and forms a liquid solution due to its high hygroscopic properties.

Potassium hydroxide (KOH): It readily absorbs water vapor from the atmosphere and becomes a thick, slippery liquid.

Hygroscopic salts:

Sodium hydroxide (NaOH): It is highly hygroscopic and readily absorbs moisture from the air, forming a solution.

Silica gel: It is a hygroscopic substance commonly used as a desiccant to absorb moisture in packaging or storage.

Anhydrous salts:

Anhydrous copper sulfate (CuSO4): It is copper sulfate without any water molecules attached to it. It appears as a white powder and is used in various applications, including analytical chemistry.

Anhydrous magnesium sulfate (MgSO4): It is magnesium sulfate without any water molecules. It is commonly used in laboratories and as a drying agent.

Hydrated salts:

Copper sulfate pentahydrate (CuSO4 · 5H2O): It is copper sulfate with five water molecules attached. It appears as blue crystals and is commonly used in agriculture, electrolytes, and as a fungicide.

Calcium sulfate dihydrate (CaSO4 · 2H2O): It is calcium sulfate with two water molecules attached. It is commonly known as gypsum and is used in construction materials and as a soil conditioner.

Salts with water of crystallization:

Epsom salt (magnesium sulfate heptahydrate) (MgSO4 · 7H2O): It is magnesium sulfate with seven water molecules attached. It is used in bath salts and as a dietary supplement.

Sodium carbonate decahydrate (washing soda) (Na2CO3 · 10H2O): It is sodium carbonate with ten water molecules attached. It is used in laundry detergents and as a cleaning agent.

These examples demonstrate the various properties and characteristics of deliquescent, hygroscopic, anhydrous, hydrated, and salts with water of crystallization.

Answer:

The answer is negative .

Boyle's Law explains the relation of pressure and volume at constant temperature.

\(P_1V_1=P_2V_2\)

The relation of pressure is directly inverse to the volume.

With this being said, if volume decreases, pressure will increase.

Answer:

Carbon carbon | C2H8 - PubChem.

Explanation:

Brainliest plz :)

Answer:

Carbon carbon | C2H8

Explanation:

happy to help

Answer:

Explanation:

Whether the electrons are added or given away makes no difference to the name given to parent atom -- It is called an ion which means that it has a charge. The word atom is reserved for something on the periodic table that has no charge.

Answer: Chemical bond formed when one or more electrons are transferred from one atom to another.

Explanation: Give me the brainiest

The expected product is (R)-2-bromobutane.

Stereochemistry plays a crucial role in determining the outcome of chemical reactions. In the given question, the stereochemistry of the intermediate I needs to be considered to determine the expected product.

The intermediate I indicates a chiral carbon center, denoted by an asterisk (*), which means it has four different substituents attached to it. This chiral carbon results in two possible stereoisomers: (R)-2-bromobutane and (S)-2-bromobutane.

When a reaction occurs at a chiral carbon, the stereochemistry of the reactant is usually retained in the product, assuming no racemization or inversion takes place during the reaction. In this case, the intermediate I has an (R) configuration, which implies that the product will also have an (R) configuration.

Therefore, the expected product is (R)-2-bromobutane.

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A nebula gives birth to the stars, planets, and material that make up a galaxy. A nebula is a huge interstellar cloud of gas and dust that serves as the nursery for stars.

The nebula's material gave rise to the stars, planets, and dust that make up a galaxy. A nebula's constituents include heavier elements like as hydrogen, helium, and others. Gravity pulls the gas and dust in the nebula together, where it eventually compresses and gives birth to stars.

Once additional gas and dust are drawn in by the gravitational attraction of these stars, planets and other celestial bodies eventually form. A galaxy is made up of the leftover dust, which has the shape of a disc.

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The exponential decay rate for healthy human body is 0.1155 and the time taken  by 94% of the chemical consumed by the body to leave is 11.5 hours.

a) The exponential decay rate, often denoted as λ (lambda), can be calculated using the formula:

\(\lambda = \dfrac{ ln(2)} {t^{\frac{1}{2}}}\)

where ln represents the natural logarithm and \(t^\frac{1}{2}\) is the half-life of the chemical.

Substituting the given half-life value:

λ = ln(2) / 6

Using a calculator, we find:

λ ≈ 0.1155

So, the exponential decay rate is approximately 0.1155.

b) To calculate the time it takes for 94% of the chemical to leave the body, we can use the formula for exponential decay:

\(N(t) = N_{o} \times e^{-\lambda t}\)

where N(t) is the amount of chemical remaining at time t, N₀ is the initial amount of chemical, λ is the decay rate, and t is the time elapsed.

We want to find the time at which N(t) is 94% of N₀, which means:

0.94N₀ = N₀ \(\times e^{-\lambda t}\)

Cancelling out N₀:

0.94 = \(e^{-\lambda t}\)

Taking the natural logarithm of both sides:

ln(0.94) = -λt

Substituting the value of λ we found earlier:

ln(0.94) = -0.1155t

Now, solving for t:

t = ln(0.94) / -0.1155

solving the above equation, we get:

t ≈ 11.46

Therefore, the exponential decay rate for healthy human body is 0.1155 and it will take approximately 11.5 hours for 94% of the chemical consumed to leave the body.

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Complete question: The half-life of a certain chemical in the human body for a healthy adult is approximately 6 hr. a)What is the exponential decay rate b How long will it take 94% of the chemical consumed to leave the body?

291.43mL

According to the combined gas law;

where:

• P₁ and P₂ are the, initial and final pressure, respectively

• V₁ and V₂ are the, initial and final volume, respectively

• T₁ and T₂ are the ,initial and final temperature, respectively (in Kelvin)

Given the following parameters

Substitute the given parameters into the formula to get the final volume V₂

On substituting these values

Hence its volume at a temperature of 80.0 °C and a pressure of 180 kPa is 291.43mL

Answer: the answer would be CaCI2

Explanation: this was one of my exam questions i got right. :)

Answer:

11 is the atomic number of alkali metal

Explanation:

The Group 1 elements are called the alkali metals. ... All the Group 1 elements are very reactive . They must be stored under oil to keep air and water away from them. Group 1 elements form alkaline solutions when they react with water, which is why they are called alkali metals.

Answer:

Hydrochloric acid + sodium hydroxide -> sodium chloride + water

Sulphuric acid + copper hydroxide -> copper sulphate + water

Nitric acid + sodium hydroxide -> sodium nitrate + water

Hydrochloric acid + calcium hydroxide -> calcium chloride + water

Sulphuric acid + potassium hydroxide -> potassium sulphate + water

Hydrochloric acid + lithium hydroxide -> lithium chloride + water

Nitric acid + magnesium hydroxide -> magnesium nitrate + water

Answer:

reaction rate∝(collisions/time)

Answer:

a,c,d for knewton

Explanation:

After considering the given the data we conclude that the  ionization energy generally increases from left to right across a period. Therefore, the element with the highest ionization energy in period 3 would be located on the right side of the periodic table.

We can also see from the search results that helium has the highest ionization energy of all the elements, while sodium has the lowest ionization energy in period 3. Therefore, we can conclude that the element with the highest ionization energy in period 3 is located to the right of sodium.
Based on the periodic table, we can see that the elements in period 3 are:
Sodium (Na)
Magnesium (Mg)
Aluminum (Al)
Silicon (Si)
Phosphorus (P)
Sulfur (S)
Chlorine (Cl)
Argon (Ar)
Therefore, the element with the highest ionization energy in period 3 is most likely Argon (Ar), which is located on the far right side of the period.
In summary, the element with the highest ionization energy in period 3 is most likely Argon (Ar).
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Peroxidase activity increases and then decreases due to a change from a moderately acidic environment (pH near 6) to a basic environment.

Peroxidase is an enzyme found in a wide variety of organisms, from plants to humans to bacteria. Its function is to decompose hydrogen peroxide (H₂O₂). Hydrogen peroxide is one of the toxins produced as a by-product of using oxygen to breathe. (The fact that hydrogen peroxide is toxic makes it useful in first aid kits.

Peroxidase activity is strongly influenced by pH factors. Peroxidase works best at pH 7, but increasing or decreasing pH adversely affects its activity. Therefore, when moving from a weakly acidic environment close to pH 6 to a basic one, the peroxidase activity increases as the neutral environment approaches and decreases as the basic environment approaches, so that the peroxidase activity varies with the pH of the solution.

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The complete question is as follows:

Researchers investigated the influence of environmental pH on the activity of peroxidase, an enzyme that catalyzes the conversion of hydrogen peroxide to water and oxygen gas. In an experiment, the researchers added a hydrogen peroxide solution containing guaiacol to several identical test tubes and adjusted the solution in each test tube to a different pH . The researchers included the guaiacol because it caused the solutions to change color as the reactions proceeded, which the researchers relied on for measuring reaction rates. Finally, the researchers added the same amount of peroxidase to each test tube and measured the rate of each reaction at 23°C . The results of the experiment are represented in Figure 1.

Based on Figure 1, which of the following statements best predicts the effect that a change from a moderately acidic environment ( pH near 6) to a basic environment will have on peroxidase activity?

answer choices

Peroxidase activity will decrease.

Peroxidase activity will increase.

Peroxidase activity will stay the same.

Peroxidase activity will increase at first and then decrease.

Answer:

~0.0004

Explanation:

\(n=\frac{m}{M}\)

n=0.072/(56+(35.5*3))=0.072/162.5~~0.004

Answer:

11) True

12) True

13) False

14)False

15) True

Explanation:

Hope this helps!

Have a nice day! :D

Answer:

I guess your answer would be A even thought it is not actually correct it is the closest to being correct.

Explanation:

The molar mass of Al2(SO4)3 is 342.15 g/mol. This means that 1 mole of Al2(SO4)3 has a mass of 342.15 g.To find the mass of sulfur in 2.0 moles of Al2(SO4)3, we first need to determine the number of moles of sulfur in 1 mole of Al2(SO4)3. There are 3 moles of sulfur in 1 mole of Al2(SO4)3, so there are 6 moles of sulfur in 2 moles of Al2(SO4)3.To find the mass of sulfur in 2.0 moles of Al2(SO4)3, we can use the following calculation:Mass of sulfur = (moles of sulfur) x (molar mass of sulfur)

Mass of sulfur = 6 mol x 32.06 g/mol

Mass of sulfur = 192.36 gTherefore, the mass of sulfur in 2.0 moles of Al2(SO4)3 is 192.36 grams.

The substance is a white solid at room temperature is sodium chlorides

Sodium Chloride is essential to maintain the electrolyte balance of fluids in a person's body. it is also known as salt table.

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Answer:

it is an endothermic reaction

Explanation:

This is because there is a rise in temperature from 20 to 46. this means that the reaction takes in heat from the suuroundings