in which change does oxidation occur? a. ch3 cho → ch3 ch2oh b. cro42-→ cr2o72- c. so42-→ so3 2- d. no2- → no3 -

Answer:

Disagree with the suggestion based on the hygroscopic nature of anhydrous magnesium sulfate

Explanation:

Magnesium sulfate in the anhydrous form is a drying agent. A drying agent salts of inorganic compounds that has the capability of absorbing water to become hydrated, when placed in the presence of a wet surface or moist air

Anhydrous magnesium sulfate is therefore hygroscopic such that it absorbs water from the atmosphere and becomes hydrated and increases in size as its volume is increased according to the following chemical equation

MgSO₄(s) + 7H₂O(l) → MgSO₄·7H₂O(s)

The molar mass of anhydrous magnesium sulfate = 120.366 g/mol

The molar mass of the heptahydrate = 246.47 g/mol

Therefore, the mass of the magnesium sulfate doubles when it forms the heptahydrate, and the magnesium sulfate grows bigger.

Answer:

The angle of incoming sunlight varies at different places

Answer: This answer is multiple choices.

1. Land and water have different heat capacities.

And

3. The angle of incoming sunlight varies at different places.

Explanation: I kept seeing other people only putting in one answer, so I used this answer from someone else. Credit to them!

The zinc blende structure is a face-centered cubic unit cell containing four Zn^2+ ions, four S^2- ions, and four ZnS units.

The zinc blende (ZnS) structure is a face-centered cubic (fcc) unit cell. In this structure, there are:
1. Four Zn^2+ ions in one cubic unit cell. They are located at the corners and the center of each face of the cube.
2. Four S^2- ions in one cubic unit cell. They occupy the alternate tetrahedral sites within the cell.
3. Four ZnS units in one cubic unit cell, as there are equal numbers of Zn^2+ and S^2- ions, and each ZnS unit consists of one Zn^2+ ion and one S^2- ion.
So, the zinc blende structure is a face-centered cubic unit cell containing four Zn^2+ ions, four S^2- ions, and four ZnS units.

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The answer is microbes.

What causes food to go bad is microbes.

Food spoilage refers to a situation in which food is unfit for human consumption due to a variety of factors, including microbial growth, which contributes to the spoilage of food items.

When microbes grow on food, they use it as a source of nutrition, and in the process, they produce waste that spoils the food.

The temperature and moisture in the environment in which food is kept play a crucial role in determining the rate of microbial growth, and microbial growth is one of the most prevalent causes of food spoilage.

A bacteria, for example, are known to grow well at room temperature, while cold temperatures prevent or slow their growth.In conclusion, microbes is the answer to this question.

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Combustion of fossil fuels: The burning of coal, oil, and natural gas for energy production in power plants, industrial processes, and residential heating is a significant source of sulfur dioxide emissions.

These fuels contain sulfur compounds that are released as sulfur dioxide when burned.Industrial processes: Various industrial activities, such as metal smelting, refining, and processing, can release sulfur dioxide into the atmosphere. For example, the production of sulfuric acid and the manufacturing of paper, pulp, and chemicals can contribute to sulfur dioxide emissions.Volcanic activity: Volcanic eruptions release sulfur dioxide into the atmosphere. Volcanoes naturally emit sulfur dioxide along with other gases and particulate matter during eruptions, which can have significant short-term impacts on air quality and regional air pollution.

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Answer:

Single replacement

Explanation: Al is replacing Cu

Answer:

B

The chemical formula does not show how the atoms are connected to one another

Answer:

b

Explanation:

edge 2020

Answer:

1077.3 molecular in 1.05*1026 molecules

I haven't taken biology in a few years, so I may be wrong, but to me it looks like mitosis, since it only divides once, and if I can see the picture correctly it looks like each cell contains the same amount of chromosomes, but I can't see the picture very well. If it helps here are some differences between meiosis and mitosis:

1. Cell Division

Mitosis: A somatic cell divides once. Cytokinesis (the division of the cytoplasm) occurs at the end of telophase.

Meiosis: A reproductive cell divides twice. Cytokinesis happens at the end of telophase I and telophase II.

2. Daughter Cell Number

Mitosis: Two daughter cells are produced. Each cell is diploid containing the same number of chromosomes.

Meiosis: Four daughter cells are produced. Each cell is haploid containing one-half the number of chromosomes as the original cell.

3. Genetic Composition

Mitosis: The resulting daughter cells in mitosis are genetic clones (they are genetically identical). No recombination or crossing over occur.

Meiosis: The resulting daughter cells contain different combinations of genes. Genetic recombination occurs as a result of the random segregation of homologous chromosomes into different cells and by the process of crossing over (transfer of genes between homologous chromosomes).

4. Length of Prophase

Mitosis: During the first mitotic stage, known as prophase, chromatin condenses into discrete chromosomes, the nuclear envelope breaks down, and spindle fibers form at opposite poles of the cell. A cell spends less time in prophase of mitosis than a cell in prophase I of meiosis.

Meiosis: Prophase I consists of five stages and lasts longer than prophase of mitosis. The five stages of meiotic prophase I are leptotene, zygotene, pachytene, diplotene, and diakinesis. These five stages do not occur in mitosis. Genetic recombination and crossing over take place during prophase I.

5. Tetrad Formation

Mitosis: Tetrad formation does not occur.

Meiosis: In prophase I, pairs of homologous chromosomes line up closely together forming what is called a tetrad. A tetrad consists of four chromatids (two sets of sister chromatids).

6. Chromosome Alignment in Metaphase

Mitosis: Sister chromatids (duplicated chromosome comprised of two identical chromosomes connected at the centromere region) align at the metaphase plate (a plane that is equally distant from the two cell poles).

Meiosis: Tetrads (homologous chromosome pairs) align at the metaphase plate in metaphase I.

7. Chromosome Separation

Mitosis: During anaphase, sister chromatids separate and begin migrating centromere first toward opposite poles of the cell. A separated sister chromatid becomes known as daughter chromosome and is considered a full chromosome.

Meiosis: Homologous chromosomes migrate toward opposite poles of the cell during anaphase I. Sister chromatids do not separate in anaphase I.

I can add the similarities between them if you need. This work is not mine, I got it from thoughtCo.

Good luck :)

Answer:

Its will particles move faster and its temperature will rises more.

Explanation:

Answer: See explanation

Explanation:

The negative effects of video games include:

1. Social disconnection- One negative effect of video games is that it brings about social disconnection. Video games are typically addictive and this leads to the individual playing the game gradually disconnecting from the social life. Such people tends to play games rather than having conversations with their friends or family members.

2. Addiction - Video games are addictive which can lead to depression or bring about mental health disorder.

3. Wrong values - Some video games instill wrong values in children. Such values include violence, aggression and vengeance.  

4. Negative academic achievement - Students who play video games a lot tend to have a negative academic achievement as the time they could have used in reading or studying is used for playing games and thus tends to have an effect on the performance in school.

5. Health hazards- Video games may lead to health hazards- such as nerve compression, obesity, and video-induced seizures.

The positive effect of video games are:

1. Problem solving - Video games train ones brain to be creative and also come up with solution to challenges.

2. Quick thinking - Video games help one to think quickly in order to solve challenges and overcome obstacles.

3. Create positive emotions - Easy games can bring about positive emotions and uplift ones mood, and help in promoting relaxation.

4. Stimulate learning - Playing video games can help an individual to learn new skills.

Answer: C: They bond easily with each other.

The volumes of N₂ gas and H₂ gas required to form 28.5 grams of N₂H₄ at 30oC and 1.50 atm are 14.3 L and 28.6 L, respectively.

To determine the volumes of N₂ gas and H₂ gas required to form 28.5 grams of N₂H₄ at 30oC and 1.50 atm, we need to use the ideal gas law to calculate the number of moles of each gas needed, and then use the balanced chemical equation to determine the volume of each gas.

Calculate the number of moles of N₂H₄

The molar mass of N₂H₄ is:

Molar mass N₂H₄ = 2 x molar mass N + 4 x molar mass H

Molar mass N₂H₄ = 2 x 14.01 g/mol + 4 x 1.01 g/mol

Molar mass N₂H₄ = 32.05 g/mol

The number of moles of N₂H₄ can be calculated as follows:

n(N₂H₄) = mass / molar mass

n(N₂H₄) = 28.5 g / 32.05 g/mol

n(N₂H₄) = 0.890 mol

Determine the number of moles of N₂ and H₂ required

From the balanced chemical equation, we see that 1 mole of N₂ reacts with 2 moles of H₂ to produce 1 mole of N₂H₄. Therefore, the number of moles of N₂ and H₂ required can be calculated as follows:

n(N₂) = n(N₂H₄) = 0.890 mol

n(H₂) = 2 x n(N₂H₄) = 1.780 mol

Use the ideal gas law to calculate the volumes of N2 and H2

The ideal gas law is given by:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant (0.0821 L atm/mol K), and T is the temperature in Kelvin.

We are given P = 1.50 atm and T = 30oC = 303 K.

For N₂ gas:

n(N₂) = 0.890 mol

R = 0.0821 L atm/mol K

T = 303 K

P = 1.50 atm

Solving for V, we get:

V(N₂) = n(N₂)RT/P

V(N₂) = 0.890 mol x 0.0821 L atm/mol K x 303 K / 1.50 atm

V(N₂) = 14.3 L

For H₂ gas:

n(H₂) = 1.780 mol

R = 0.0821 L atm/mol K

T = 303 K

P = 1.50 atm

Solving for V, we get:

V(H₂) = n(H₂)RT/P

V(H₂) = 1.780 mol x 0.0821 L atm/mol K x 303 K / 1.50 atm

V(H₂) = 28.6 L

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The correct matches are:

(i) Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules.

(ii) 1º and 2º amides experience primarily hydrogen bonding between their molecules.

(iii) Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape.

(iv) 1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape.

i.

Acid chlorides and esters experience primarily dipole-dipole interactions between their molecules due to the presence of polar bonds within the molecules.

ii.

1º and 2º amides experience primarily hydrogen bonding between their molecules, as they contain the necessary hydrogen and oxygen or nitrogen atoms for hydrogen bonding.

iii.

Acid chlorides, esters, and 3º amides have lower boiling points than other carboxylic acid derivatives of similar size and shape. This is due to the absence of hydrogen bonding in these compounds, resulting in weaker intermolecular forces.

iv.

1º and 2º amides have the highest boiling points among other carboxylic acid derivatives of similar size and shape. This is because they can form extensive hydrogen bonding between their molecules, leading to stronger intermolecular forces and higher boiling points.

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Depressants are often classified according to the degree to which they decrease CNS activity. The correct answer is c.

Depressants are a class of drugs that work by slowing down the central nervous system (CNS). They are often classified based on the degree to which they decrease CNS activity, with some being more potent than others. Examples of depressants include alcohol, benzodiazepines, barbiturates, and opioids.

They are commonly used to treat anxiety, insomnia, and pain, but they can also be abused for their euphoric effects. It is important to use depressants only as directed by a healthcare provider and to avoid combining them with other depressants or alcohol, as this can increase the risk of overdose and death. Therefore, correct answer is c.

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--The complete question is, Depressants are often classified according to:

a. their MSA rating

b. the degree to which they react with alcohol

c. the degree to which they decrease CNS activity

d. the first letter in their names--

Answer:

Thorium

Explanation:

I hope it's correct ;))

Approximately 69.7 moles of carbon dioxide gas occupy a volume of 81.3 L at a pressure of 204 kPa and a temperature of 95.0 °C.

To calculate the number of moles of carbon dioxide gas, we can use the ideal gas law equation:

PV = nRT

Where:

P is the pressure of the gas in kilopascals (kPa),

V is the volume of the gas in liters (L),

n is the number of moles of gas,

R is the ideal gas constant (0.0821 L·atm/mol·K or 8.314 J/mol·K), and

T is the temperature of the gas in Kelvin (K).

First, we need to convert the given temperature from Celsius to Kelvin:

T = 95.0 °C + 273.15 = 368.15 K

Next, we can rearrange the ideal gas law equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

P = 204 kPa

V = 81.3 L

R = 0.0821 L·atm/mol·K (ideal gas constant)

n = (204 kPa * 81.3 L) / (0.0821 L·atm/mol·K * 368.15 K)

Calculating the expression:

n = 69.7 mol

Therefore, approximately 69.7 moles of carbon dioxide gas occupy a volume of 81.3 L at a pressure of 204 kPa and a temperature of 95.0 °C.

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\(IBr^{-}_{2}\) has 3 pairs of non-bonding electrons as shown in the picture.

\(IBr^{-}_{2}\) has a linear structure and includes three lone pairs of electrons in an equatorial location. This decreases the lone pair repulsions, and the two bromine atoms are in an axial position. Therefore, the structure  \(IBr^{-}_{2}\) has a linear organization. \(IBr^{-}_{2}\) has an iodine atom that possesses two bond pairs as well as three lone pairs of electrons. Both bond pairings are formed using atoms containing two bromines.

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The prepare a 0.120 M aqueous solution of silver fluoride (Gf) using a 300 mL volumetric flask, follow these steps Calculate the number of moles of silver fluoride needed Molarity M = moles of solute / volume of solution in liters
Rearrange the equation.

The find the moles of solute moles of solute = Molarity (M) × volume of solution in liters moles of Gf = 0.120 M × 0.300 L = 0.036 moles Calculate the mass of silver fluoride required Mass (g) = moles × molar mass of Gf The molar mass of Gf = 108 g/mol (Ag) + 19 g/mol (F) = 127 g/mol Mass of Gf = 0.036 moles × 127 g/mol = 4.572 g Measure 4.572 grams of solid silver fluoride using a balance and add it to the 300 mL volumetric flask. Fill the volumetric flask with distilled water until it reaches the 300 mL mark and mix well to ensure the silver fluoride is completely dissolved. You have now prepared a 0.120 M aqueous solution of silver fluoride using a 300 mL volumetric flask by adding 4.572 grams of solid silver fluoride.

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Answer:

the  specific heat capacity of the sample is 1011.05 J /kg k

Explanation:

The computation of the  specific heat capacity of the sample is shown below:

Given that

Q=mcΔθ

Now Heat gain by the calorimeter is

= (0.200)×  (4180) × (26.1 - 19) + (0.15) × (390) ×(26.1 - 19)

=6 350.95J

Now

6350.95=(0.0850) × c ×(100-26.1)

c= 6350.95 ÷ ((0.085) × (100 - 26.1))

= 1011.05 J /kg k

Hence, the  specific heat capacity of the sample is 1011.05 J /kg k

The amount of H₂SO₄ in moles is 0.00500 mol.

a. The equation for the reaction of H₂SO₄ with Mg(OH)₂ is:

Mg(OH)₂ + H₂SO₄ → MgSO₄ + 2H₂O

b.The excess sulfuric acid required is 0.0950 mol dm⁻³

The amount of H₂SO₄ used is given as 50.00 cm3 of 0.100 mol dm⁻³ sulfuric acid.

Therefore, the amount of sulfuric acid used is:

Amount of sulfuric acid = 0.100 mol dm⁻³ × 0.05000 dm3= 0.00500 moles

The balanced equation shows that one mole of  H₂SO₄ reacts with one mole of Mg(OH)₂.

Therefore, the number of moles of  H₂SO₄ required to react with 0.00500 moles of Mg(OH)₂ is 0.00500 moles.

So, the excess amount of sulfuric acid used is 0.100 mol dm⁻³ − 0.00500 mol = 0.0950 mol dm⁻³

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The mass of sulfurous acid produced when 245g of sulfur dioxide is reacted with water is 313.8 g

From the question, we are to determine the mass of sulfurous acid produced

First, we will write the balaced chemical equation for the reaction

H₂O + SO₂ → H₂SO₃

This means 1 mole of H₂O reacts with 1 mole of sulfur dioxide (SO₂) to produce 1 mole of sulfurous acid (H₂SO₃)

Now, we will determine the number of moles of sulfur dioxide present

Mass of sulfur dioxide present = 245 g

Molar mass of sulfur dioxide = 64.066 g/mol

Using the formula,

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

Then,

Number of moles of SO₂ present = \(\frac{245}{64.066}\)

Number of moles of SO₂ present = 3.824 moles

This is the number of moles of SO₂ present

From balanced chemical equation

1 mole of H₂O reacts with 1 mole of sulfur dioxide (SO₂) to produce 1 mole of sulfurous acid (H₂SO₃)

Then,

Water (H₂O) will react with the 3.824 moles of sulfur dioxide (SO₂) to produce 3.824 moles of sulfurous acid (H₂SO₃)

∴ The number of moles of sulfurous acid produced is 3.824 moles

Now, for the mass of sulfurous acid produced

Molar mass of sulfurous acid = 82.07 g/mole

Using the formula,

Mass = Number of moles × Molar mass

Mass of sulfurous acid produced = 3.824 × 82.07

Mass of sulfurous acid produced = 313.8 g

Hence, the mass of sulfurous acid produced is 313.8 g

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Answer:

B.A Solution with a pH greater than 7

Answer:

A

Explanation:

A "Basic solution" Or a base solution is a solution that has less than a level 7 of pH levels

So the answer would be A

To write the net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and perchloric acid are combined, first perform the complete ionic equation and then identify and eliminate the ions that do not participate.

A net ionic equation shows only the chemical species involved in the reaction

A net ionic equation is written with the smallest possible integer values as stoichiometric coefficients.

HClO4 (l) + NaOH (aq) → NaClO4 (aq) + H2O (l)

H+(aq) + OH−(aq) → H2O(l)

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Answer:

Tara is making a scrapbook using 24 photos and 8 newspaper clippings. She wants to put the same number of photos and clippings on each page. What is the greatest number of scrapbook pages Tara can make?

Explanation:

Tara is making a scrapbook using 24 photos and 8 newspaper clippings. She wants to put the same number of photos and clippings on each page. What is the greatest number of scrapbook pages Tara can make?

Answer:

The properties of metals as well as non metals is called metalloids.

From an 18-carbon fatty acid, the process of beta-oxidation can produce 9 acetyl-CoA molecules.

In the process of beta-oxidation, each round of the cycle removes two carbon units in the form of acetyl-CoA from a fatty acid chain. Therefore, the number of acetyl-CoA molecules that can be produced from an 18-carbon fatty acid can be determined by dividing the total number of carbon units by 2.

For an 18-carbon fatty acid:

Number of acetyl-CoA molecules = (Number of carbon units) / 2

= 18 / 2

= 9

Hence, from an 18-carbon fatty acid, the process of beta-oxidation can produce 9 acetyl-CoA molecules.

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Answer:

Physical change

Explanation:

The molecules are being rearranged as the water changes phases from liquid to gas, but this doesn't change the chemical structure of the water.