The active agent in many hair bleaches is hydrogen peroxide. The amount of H₂O₂ in 14.8 g of hair bleach was determined by titration with a standard potassium permanganate solution:
2MnO₄(aq) + 5H₂O₂(aq) + 6H⁺(aq) → 5O₂(g) + 2Mn²⁺(aq) +8H₂O(l) (c) How many grams of H₂O₂ were in the sample?

Answer:

Iconic, neutral, and cation

Explanation:

When a metal and a nonmetal react, the result is a(n) Ionic compound. Ratio of cat ions and anion depends on the ionic charge of each. All ionic compounds come together in the simplest ratio to make a  neutral formula unit and the cation  is always written first in the formula.

The ionic compounds are solids in crystalline form and these are formed by opposite charged ion packing,  formed by the reaction of metals react with non-metals.

Elements can either gain or lose electrons in order to achieve noble gas configuration and these formation of ions helps them gain stability, the structure of ionic compound depend on the relative sizes of the cations and anions.

Ionic compounds are salts, oxides, hydroxides, sulphides, and the inorganic compounds. Ionic solids are held together by the electrostatic attraction between the positive and negative ions.

Learn more about ionic compound, here:

https://brainly.com/question/977324

#SPJ2

Answer:

should be 2M

Explanation:

:)

According to the meaning of a fossil, a fossil is a once-living organism's remains that have been kept by nature

A fossil is any conserved remnants, imprint, or evidence of any once-living object from a previous geological era (from the Classical Latin fossilis, lit. "obtained by excavating"). Examples include exoskeletons, bones, shells, animal or microbe impressions in stone, items kept in amber, hair, petrified wood, and Genetic traces. The sum of fossils is known as the fossil record.

The study of fossils, including their age, creation process, and evolutionary importance, is known as palaeontology. If a specimen is more than 10,000 years old, it is typically regarded as a relic.

Learn more about fossil

https://brainly.com/question/14988327

#SPJ1

To classify two white crystals as either ionic or covalent in nature, you could perform a series of tests and observations to gather evidence and make a determination.

what are the steps that are followed ?

Solubility: Ionic substances tend to dissolve readily in water, forming a clear solution, while covalent substances are often insoluble in water and form a cloudy solution. You could dissolve a small amount of each crystal in water and observe the solution.

Conductivity: Ionic substances are good conductors of electricity in aqueous solution, while covalent substances are poor conductors. You could measure the conductivity of the solutions from step 1.

Melting and boiling points: Ionic substances have high melting and boiling points due to the strong electrostatic forces between ions, while covalent substances have lower melting and boiling points due to weaker intermolecular forces. You could measure the melting and boiling points of the crystals.

Crystal structure: Ionic substances form a crystal lattice structure due to the repeating arrangement of ions, while covalent substances often have a more random molecular arrangement. You could observe the crystal structure of the substances under a microscope.

By performing these tests and observations, you should be able to gather enough evidence to classify the two white crystals as either ionic or covalent in nature.

To learn more about covalent substances follow the given link: https://brainly.com/question/29551714

#SPJ1

The correct answer is cerium 141,911amu.

A unit atomic mass is defined as one-twelfth of the mass of a single carbon-12 atom. The atomic mass of an element is the atomic mass. Average atomic mass is the weighted average of the atomic masses of all isotopes of that element.

To answer this question, a formula is written to calculate the average atomic mass of cerium. (135.90714 amu × 0.0019 )+ ( 137.90599 amu × 0.0025 )+ ( 139.90543 amu * 0.8843 )+(Ce−142 × 0.1113)

= 140.116

Solving the equation for Ce-142 gives an atomic weight of 141.911 amu.

The correct answer is 141,911 amu. 

learn more about atomic mass

brainly.com/question/14250653

#SPJ4

Answer:

Chemical because water + metal = rust.

Explanation:

A new substance was formed.

The mass percentage of Cl⁻ in the solution produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is 1.86 %.

The total mass of the solution which is produced when 3.00g of CaCl₂ is dissolved in 100.0mL of water is determined as follows:

mass of CaCl₂ = 3.0 g

mass of water = density * volume

mass of water = 1.00 g/mL * 100.0 mL

mass of water = 100.0 g

mass of solution = (100.0 + 3.0) g

total mass of solution = 103.0 g

molar mass of CaCl₂ = (40 + 35.5 * 2) g/mol

molar mass of CaCl₂ = 111 g/mol

mass percentage of Cl⁻ in CaCl₂ = 71/111

mass of Cl⁻ present in 3.0 g of CaCl₂ = 71/111 * 3 = 1.92 g

mass percentage of Cl⁻ in the solution = 1.92/103 * 100%

mass percentage of Cl⁻ in the solution = 1.86 %

Learn more about mass percent at: https://brainly.com/question/23856068

#SPJ1

The product would form in the grignard reaction of phenylmagnesium bromide with carbon dioxide:

\(C_6H_5MgBr\) + \(CO_2\) → \(C_6H_5COOMgBr\) (carboxylate intermediate)

\(C_6H_5COOMgBr\) + \(H_2O\) → \(C_6H_5COOH\) + \(MgBrOH\) (final product)

The reaction of phenylmagnesium bromide (\(C_6H_5MgBr\)) with carbon dioxide (\(CO_2\)) forms benzoic acid (\(C_6H_5COOH\)). The reaction mechanism involves the nucleophilic addition of the carbanion formed by the Grignard reagent to the electrophilic carbon of carbon dioxide to form a carboxylate intermediate. The intermediate is then protonated by water to form the final product, benzoic acid. The reaction can be represented as:

\(C_6H_5MgBr\) + \(CO_2\) → \(C_6H_5COOMgBr\) (carboxylate intermediate)

\(C_6H_5COOMgBr\) + \(H_2O\) → \(C_6H_5COOH\) + \(MgBrOH\) (final product)

Learn more about grignard reaction here https://brainly.com/question/30481814

#SPJ4

Answer:

O The heat absorbed in Trial 1 is about 3,347) greater than the heat absorbed in Trial 2

Explanation:

Using the formula as follows;

Q = m × c × ∆T

Where;

Q = amount of heat absorbed (J)

m = mass of substance (g)

c = specific heat of water = 4.18J/g°C

∆T = change in temperature (°C)

* For trial 1:

m = 30g

∆T = 40°C - 0°C = 40°C

Q = 30 × 4.18 × 40

Q = 5016J

* For trial 2:

m = 40g

∆T = 40°C - 30°C = 10°C

Q = 40 × 4.18 × 10

Q = 1672J

From the above results, it is clear that the amount of heat absorbed in trial 1 (5016J) is greater than that absorbed in trial 2(1672J) with a difference of 3344.

Heat energy is generated by the movement of molecules, atoms, and ions. The heat absorbed in 1st trial is 3,347 greater than the heat absorbed in 2nd trial.

Specific heat is given by the heat energy, mass of the substance, and the change in the temperature.

The heat transfer can be shown as,

\(\rm Q = m \times c \times \Delta T\)

Here, Q is the heat absorbed, m is mass, c is the specific heat, and delta T is the temperature change.

Q for trial 1:

\(\begin{aligned} \rm Q& = \rm m \times c \times \Delta T\\\\&= 30 \times 4.18 \times 40\\\\&= 5016\;\rm J\end{aligned}\)

Q for trial 2:

\(\begin{aligned} \rm Q& = \rm m \times c \times \Delta T\\\\&= 40\times 4.18 \times 10\\\\&= 1672 \;\rm J\end{aligned}\)

Therefore, in option B. the amount of heat absorbed in trial 1 is more than in trial 2.

Learn more about heat and energy here:

https://brainly.com/question/23733566

Answer:

12

Explanation:

The critical angle for light propagating in glass when the glass is immersed in water is 47.1°, in benzene it is 90°, and in diiodomethane it is 62.5°.

The critical angle for light propagating in glass when the glass is immersed in a medium can be calculated using Snell's Law, which relates the angle of incidence and the angle of refraction of light as it passes through a boundary between two medium with different refractive indices.

Using the following formula, the critical angle can be determined:

critical angle = \(sin^{-1 }(\frac{n_2}{n_1})\)

Where n₁ is the refractive index of the first medium (in this case, glass), and n₂ is the refractive index of the second medium.

Now, let's consider the given question:

When the glass is immersed in water, the critical angle can be calculated using the refractive indices of glass and water, which are approximately 1.5 and 1.33, respectively.

Using the formula with these values, we obtain:

critical angle = \(Sin^{-1} (\frac{1.33}{1.5}) = 47.1 \textdegree\)

When the glass is immersed in benzene, the critical angle can be calculated using the refractive indices of glass and benzene, which are approximately 1.5 and 1.50, respectively.

Using the formula with these values, we obtain:

critical angle = \(Sin^{-1} (\frac{1.50}{1.5}) = 90 \textdegree\)

When the glass is immersed in diiodomethane, the critical angle can be calculated using the refractive indices of glass and diiodomethane, which are approximately 1.5 and 1.74, respectively.

Using the formula with these values, we obtain:

critical angle = \(Sin^{-1} (\frac{1.74}{1.5}) = 62.5 \textdegree\).

Hence, The critical angle for light to pass through glass when submerged in water is 47.1°, 90° for benzene, and 62.5° for diiodomethane.

learn more about critical angle here:

brainly.com/question/3314727

#SPJ4

Answer:

Sunflower- The common sunflower (H. annuus) is an annual herb with a rough hairy stem 1–4.5 metres (3–15 feet) high and broad, coarsely toothed, rough leaves 7.5–30 cm (3–12 inches) long arranged in spirals. The attractive heads of flowers are 7.5–15 cm wide in wild specimens and often 30 cm or more in cultivated types.

Answer:

1. Convert the mass of A to moles dividing in molar mass

2. Convert the moles of A to moles of D (2mol A = 3mol D)

3. Convert the moles of D to mass multiplying by its molar mass

Explanation:

As you can see in the equation, 2moles of A produce 3 moles of D, the equation is:

2mol A = 3mol D

But in the problem you are having the mass of A and you need the mass of D. That means you require to convert the mass of A to moles. With the moles of A you can find the moles of D and, as last, you need to convert the moles of A to mass.

To convert mass to moles or vice versa you must use Molar Mass. That means, the answer is:

Answer:

D) C₄H₉OH

Explanation:

In chemistry, isomers are chemical substances with the same formula (That is, same atoms but in different structures).

For the compound C₂H₅OC₂H₅ there are 4 atoms of C, 10 atoms of H and 1 atom of O.

A) CH₃COOH . This compound have 2 atoms of C, 4 atoms of H and 2 atoms of O. Thus, isn't an isomer.

B) C₂H₅COOCH₃. There are 4 atoms of C but 8 atoms of H and 2 atoms of O. Isn't an isomer

C) C₃H₇COCH₃. There are 5 atoms of C, 10 atoms of H and 1 atom of O. Thus, isn't an isomer

D) C₄H₉OH. Here, you have 4 atoms of C, 10 atoms of H and 1 atom of O. That means this structure is the isomer of C₂H₅OC₂H₅

A solution is defined as the homogeneous mixture of two or more non reacting substances. It constitute a single phase system. Here the water is called the solvent.

A solution which is made up of two components or constituents is generally defined as the binary solution. The term solute is commonly used to refer to the constituent that dissolves and the term solvent is that in which the dissolution takes place.

In general, solute is the component which is present in smaller amount whereas the solvent is present in larger amount.

Thus in the sugar solution, sugar is the solute and water is the solvent.

To know more about solution, visit;

https://brainly.com/question/29058690

#SPJ1

The artist adds pigment powder when melting wax with the encaustic method.option c.

Encaustic painting involves the use of heated wax as a medium. To create colors and add pigmentation to the wax, artists typically incorporate pigment powder. This allows them to achieve a wide range of vibrant hues and create various effects on their artwork.

By adding pigment powder to the melted wax, artists can control the intensity and shade of the colors they desire, enhancing the visual appeal and artistic expression of their encaustic paintings.

In encaustic painting, the addition of pigment powder to the melted wax provides the artist with a versatile and flexible medium for color manipulation. The powder is mixed into the molten wax until it is thoroughly blended, ensuring even distribution of the pigments.

This process allows artists to achieve different levels of transparency, opacity, and saturation in their artwork. The use of pigment powder in encaustic painting enables artists to create intricate details, textured surfaces, and expressive brushwork, adding depth and complexity to their compositions.

Overall, pigment powder is an essential component in the encaustic method, providing artists with a means to bring their artistic visions to life through a rich and visually captivating color palette.option c.

for such more questions on wax

https://brainly.com/question/25074953

#SPJ8

Answer:

Explanation:

the discovery of microscopes

Answer: A . The cell theory

Explanation:

Answer:

For your first one it is C and your second one is D how deep is the lake.

Its going to be disicult to swim down at the bottom of a lake with all your class just to see how deep it is, so its better to make a model

Answer:

Explanation:

The mass of the sailboat can be found by using the formula

\(m = \frac{f}{a} \\ \)

f is the force

a is the acceleration

From the question we have

\(m = \frac{4000}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

Cutting hair is a physical change since it doesn't change the substance its still hair

bending a paper clips since it's also the same substance

Ice cube melting

Explanation:

All of these are physical change since there reversible and they all still stay the same substance

Answer:

BARIUM HYDROXIDE IS THE COMPOUND

The presence of a positive rheumatoid factor (RF) is not always indicative of rheumatoid arthritis (RA).

While RF is often used as a diagnostic marker for RA, it is not specific to this disease and can also be present in other autoimmune conditions such as Sjogren's syndrome, systemic lupus erythematosus (SLE), and mixed connective tissue disease. Furthermore, around 20-30% of people with RA may test negative for RF, making it an imperfect diagnostic tool.

It is important to note that RF is just one of many factors that doctors consider when diagnosing RA. Other factors such as symptoms, physical exam findings, imaging tests, and other laboratory markers such as anti-cyclic citrullinated peptide (anti-CCP) antibodies, erythrocyte sedimentation rate (ESR), and C-reactive protein (CRP) levels are also taken into account.

In summary, the presence of a positive RF is not always indicative of RA, as it can also be present in other autoimmune conditions. A thorough evaluation of symptoms, physical exam findings, and other laboratory markers is necessary to make an accurate diagnosis of RA.

To know more about rheumatoid arthritis, refer to the link below:

https://brainly.com/question/30130207#

#SPJ11

IUPAC name -Ascorbic Acid (Vitamin C)-(5R)-[(1S)-1,2-Dihydroxyethyl]-3,4-dihydroxyfuran-2(5H)-one, Fruit sugar or D-fructose are other names for fructose-fructose. D-glucose, or glucose.

Early in the 1930s, vitamin C—then known as "hexuronic acid"—was extracted from fruits, vegetables, and the adrenal cortex. After being proved to treat scurvy in guinea pigs, it was renamed ascorbic acid to reflect its anti-scorbutic qualities.

Description. Ascorbic acid, a naturally occurring organic substance with antioxidant qualities, is offered by TCC. C6H8O6 is its chemical formula. It is a crystalline white substance that mixes easily with water to form moderately acidic solutions.

Learn more about vitamins here:

https://brainly.com/question/24324739

#SPJ1

Answer:

2HNO3 +Na2CO3 → CO2 + H2O + 2NaNO3

Answer:

Na2CO3 + 2HNO3 → 2NaNO3 + CO2 + H2O

End product is Sodium Nitrate in solution, plus plenty of carbon dioxide gas bubbles and water.

Brainliest pweasee if I could help you! <3

Answer:

0.00244

Explanation:

we have 25.4mm in one inch. Hence, 0.0620 divided by 25.4 to give us 0.00244 inches

The onion skin is really wonderful and it adds infusing flavor into soups, sauces and stock. The inches of onion skin of 0.0620 millimeters thick is 0.0024 inches.

The outer skins of onion and garlic provides enormous amount of vitamins like Vitamin A, C, E and plenty of antioxidants. The skin of onion is also a rich source of flavonoids. The onions are packed with sulfur which promotes the hair growth.

The skin of onion have both anti inflammatory and antioxidant properties which help to manage the symptoms like cold, flu and cough. The intake of onion peel is also helpful in reducing the weight of our body.

Here we have to convert 0.0620 millimeters into inches.

1 millimeter = 0.0394 inches

0.0620 millimeters = 0.0024 inches

Thus an onion skin which is measured to be 0.0620 millimeters thick is 0.0024 inches.

To know more about onion cell, visit;

https://brainly.com/question/29888473

#SPJ2

Answer:

climate change, dead zones, genetic engineering, pollutants, deforestation, soil degradation, waste, Over irrigation, salt buildup in soils, monoculture

Explanation:

Hopefully this'll help you!

The thermodynamic quantity that expresses the extent of randomness in a system is entropy.

A state of disorder, unpredictability, or uncertainty are frequently related with the scientific concept of entropy, which is also a quantifiable physical characteristic. The notion and the phrase are employed in a variety of disciplines, including classical thermodynamics, where they were initially identified, statistical physics, which describes nature at the molecular level, and information theory and entropy. It has wide-ranging uses in physics and chemistry, biological systems and how they relate to life, cosmology, economics, sociology, weather science, and information systems, particularly the transfer of information through telecommunication.

In 1850, the Scottish engineer and physicist Macquorn Rankine used the terms thermodynamic function and heat potential to describe the thermodynamic notion and entropy.

Learn more about Entropy here:

https://brainly.com/question/13146879

#SPJ4

Answer: The correct answer is The aplastic potential energy of the spring will be two times greater than the gravitational potential energy of the object.

Explanation: The formula for Gravitational potential energy is= mgh where

m= mass

g= 9.8

h= height

On the other hand the formula for elastic potential energy is (1/2)KX^2

Where K is the spring. By changing the values of H and X, we will see elastic potential energy will remain more.

Answer:

the answer is C

Explanation:

took the test one edge

Answer: