the size of a marble is an example of
physical change
physical property
chemical change
chemical property

100 gram of cobalt and chloride in 250 gram of water to make solution  that its density 1.25g/ml then the molarity of the solution will be 2.42m and 2.16 M.

Determine some important information:

Solute = CoCl₃ (molar mass = 165.29 g/m); mass of 100 g

Solvent = Water, mass of 250 g

Solution of mass = mass of CoCl₃ + mass of water

250 gram + 100 gram = 350 gram of solution

If we want to reach a molarity (mol/L), let's determine solution volume with its density:

Solution of density = solution mass / volume of solution

1.25 g/mL = 350 g / volume of solution

Volume of solution = 350 g / 1.25 g/mL = 280 mL

Let's convert the volume into Liter → 280 mL = 0.280L

Let's convert the mass of a solute into moles = 100 g / 165.29 g/m →0.605 mol

Mol/L = 0.605 mol / 0.280 L = 2.16 M

Now let's to calculate the molalilty (mol/kg of solvet)

We must to convert mass of a solvent into kg → 250g = 0.250 kg

Then, 0.605 mol / 0.250 kg =2.42 m

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Hg is a heterogeneous mixture, not a homogeneous mixture.

In chemistry, a mixture is a substance consisting of two or more different chemical substances that are not chemically combined. A mixture is two or more substances physically combined in which they retain their identity and are mixed in the form of solutions, suspensions, and colloids.

A mixture is formed when two or more different substances are physically combined and can be separated into their original substances. A chemical reaction occurs when two or more substances combine to form a new substance that cannot be converted back into the original substance.

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Answer: Hope This Helps

Explanation:

1:  The nephrons contain a filter called the glomerulus. The fluid that is filtered  from the blood then travels down through a tubule. The tubule adjusts the level of wastes that will leave the body in the urine.

(I dont know the second part so hope this half answer helps a little bit. Sorry.)

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✍ 1. ➺ Nephrons have filters known as glomerulus (they are a cluster of very thin-walled blood capillaries). Glomerulus filters our blood & then removes any unwanted waste materials. Now, this filtrate which is removed out from the blood gets collected & filtered again in the Bowman's Capsule & tubules from where nephrons remove glucose, amino acids & a major amount of water. The urine forming in each kidney now enters a long tube (ureter) where urine passes & gets stored in the urinary bladder. Urine gets passed out of the body through the urethra.

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✐ 2. i) Property of metals ⎆ Good conduction of heat.

ii) Property of metals ⎆ Good conduction of electricity & ductility.

iii) Property of metals ⎆ Malleability & ductility.

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Answer:6

Explanation:

Answer:

CHEMICAL KINETICS can also be called as REACTION KINETICS.

CHEMICAL KINETICS is one of the branches of physical chemistry.

Explanation:

CHEMICAL KINETICS describes the speed of chemical species where they transform in new substances by breaking down. After breaking down they form molecular bonds.

Study of a chemical reaction can be stated as CHEMICAL KINETICS.

CHEMICAL KINETICS can be used in real life.

To know more about CHEMICAL KINETICS

Answer:

the answer is (G)

Explanation:

It is G!

Your welcome!

The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.

When a compound is formed, the less electronegative atom in the compound is called the central atom in the molecule. The angle formed by the nuclei of two surrounding atoms with the nucleus of the central atom in a structure is called a bond angle.

The bond angle is usually based on the geometry of the molecule. The expected geometry can be deviated for certain reasons such as the presence of lone pairs on the central atom in the molecule. The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.

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Answer:      The theory of plate tectonics tells us that the earth's surface sits on plates that shift due to the built up pressure underneath. When the pressure gets too much, it has to escape somewhere so it goes to the edges of the plate and causes earthquakes. This in turn causes the surface to shift.

Therefore, the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M hydrosulfuric acid solution are pH = 7.78 and [S²⁻] = 2.31x10⁻¹¹ M.

Hydrosulfuric acid (H₂S) is a weak acid that dissociates in water to produce hydrogen ions (H⁺) and bisulfide ions (HS⁻). H₂S(aq) + H₂O(l) ⇌ H₃O⁺(aq) + HS⁻(aq)

The bisulfide ions (HS⁻) in turn reacts with water to produce hydronium ions (H₃O⁺) and sulfide ions (S²⁻).

HS⁻(aq) + H₂O(l) ⇌ H₃O⁺(aq) + S²⁻(aq) Ka1

= 1.0x10⁻⁷,

Ka2 = 1.0x10⁻¹⁹

To calculate the pH and the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we must first determine if H₂S(aq) is a strong or weak acid.

It has Ka1 = 1.0x10⁻⁷, which is a very small value; thus, we can conclude that H₂S(aq) is a weak acid.

To calculate the equilibrium concentration of S²⁻ in a 6.89x10⁻² M H₂S(aq) solution, we need to use the Ka2 value (Ka2 = 1.0x10⁻¹⁹) and a chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0Change -x +x +x

Equilibrium (6.89x10⁻² - x) x xKa2 = [H₃O⁺][S²⁻]/[HS⁻]1.0x10⁻¹⁹

= x² / (6.89x10⁻² - x)

Simplifying: 1.0x10⁻¹⁹ = x² / (6.89x10⁻²)

Thus: x = √[(1.0x10⁻¹⁹)(6.89x10⁻²)]

x = 2.31x10⁻¹¹ M

Thus, [S²⁻] = 2.31x10⁻¹¹ M

To calculate the pH of the solution, we can use the Ka1 value and the following chemical equilibrium table.

[H₂S] = 6.89x10⁻² M[H₃O⁺] [HS⁻] [S²⁻]

Initial 0 0 0

Change -x +x +x

Equilibrium (6.89x10⁻² - x) x x

Ka1 = [H₃O⁺][HS⁻]/[H₂S]1.0x10⁻⁷

= x(6.89x10⁻² - x) / (6.89x10⁻²)

Simplifying: 1.0x10⁻⁷ = x(6.89x10⁻² - x) / (6.89x10⁻²)

Thus: x = 1.66x10⁻⁸ M[H₃O⁺]

= 1.66x10⁻⁸ M

Then, pH = -log[H₃O⁺]

= -log(1.66x10⁻⁸)

= 7.78 (rounded to two decimal places)

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The natural clod sample is likely to have the lower bulk density.

The paraffin clod method is a method for determining the bulk density of soil. In this method, a sample of soil is taken and saturated with water. The wet soil is then placed in a container with melted paraffin wax, which solidifies around the soil to form a "clod" that can be easily removed from the container.

Based on this principle, the sticky cube sample (which presumably contains a higher proportion of fine particles, as indicated by its sticky texture) would have a higher bulk density than the natural clod sample. Therefore, the natural clod sample is likely to have the lower bulk density.

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The option for which we can directly compare the Ksp values to determine their relative solubilities are Ag₂CrO₄ and AgBr. Thus, the correct option is A.

Relative solubilities can be directly compared with Ksp values to determine the relative solubilities of Ag₂CrO₄ and AgBr. Solubility Product Constant (Ksp) is the term which is used to describe the equilibrium constant that exists between a solid and its ions in a solution.

In addition to Ag₂CrO₄ and AgBr, the solubilities of the other given compounds cannot be determined using their Ksp values since they are not in the same class of compounds. Ksp can be defined as the product of the concentrations of its ions to a specific power, which is known as the solubility product. For every solute, the Ksp has a unique value. The Ksp is not reliant on the concentration of the solute.

Therefore, the correct option is A.

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The sprinter's speed after 2 seconds is 9 m/s.

Use the equation of motion to solve this problem:

v = u + at

where

v = final velocity (what we need to find)

u = initial velocity (0 m/s for a stationary object)

a = acceleration (4.5 m/s²)

t = time (2 s)

Plugging in the values:

v = 0 + (4.5 m/s²) × (2 s)

v = 9 m/s

Therefore, the sprinter's speed 2 seconds later is 9 m/s.

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Complete question:

A sprinter leaves the starting blocks with an acceleration of 4.5m/s^2. What is the sprinter's speed 2 s later?

Answer:

The energy for a quantum of light is 2.84 x 10-19

try that

There are five kinds of molecules involved in the given equation.

In the given equation, we have two molecules of ethane (C\(_{2}\)H\(_{6}\)) reacting with seven molecules of oxygen (O\(_{2}\)). This means we have two different kinds of molecules on the reactant side: ethane (C\(_{2}\)H6) and oxygen (O\(_{2}\)).

On the product side of the equation, we have four molecules of carbon dioxide (CO\(_{2}\)) and six molecules of water (H\(_{2}\)O). This gives us two additional kinds of molecules on the product side: carbon dioxide (CO\(_{2}\)) and water (H\(_{2}\)O).

Therefore, in total, there are five kinds of molecules involved in the equation: ethane (C\(_{2}\)H\(_{6}\)), oxygen (O\(_{2}\)), carbon dioxide (CO\(_{2}\)), water (H\(_{2}\)O).

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Answer:

Helium

Explanation:

Answer:

helium i guess i m not sure

Answer:

I solved the questions then counted how many significant figures in each answer

eg,

0.042m+1.33m =1.372m

1.372 has 4 significant figures

that's how you do others

Explanation:

6. 1.372m = 4 significant figures

7. 4.345g = 4 significant figures

8. 12L = 2 significant figures

9. 27.3cm = 3 significant figures

10. 0.975 = 3 significant figures

Since Variation X is beneficial to the organism, Variation X became more common because it increases an individual's probability of surviving and reproducing.

Genetic variation refers to any changes that exists between organisms of a species due to genetic changes as well as environmental interactions with the organisms genes.

Variations that are beneficial are those that makes the organism better suited to its environment.

Based on the table given, Variation X became more common because it increases an individual's probability of surviving and reproducing.

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Answer: Variation X became more common

Explanation:

Genetic engineering has helped farming primarily by creating crops that resist some diseases.

Through the use of genetic engineering, scientists have been able to modify the DNA of crops to make them more resistant to various diseases. This has led to increased crop yields, as fewer crops are lost to diseases, and reduced dependency on harmful chemical pesticides, which can have negative effects on the environment and human health.

Genetic engineering has significantly improved farming practices by developing disease-resistant crops, leading to higher crop yields and more sustainable agricultural methods.

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Answer:

Explanation:

To make it stronger you simply need to add more powdered drink mix or add less water. Concentration is basically the amount of something in something else. In this case, the more powdered mix is in the mixture per liter of water, the higher the concentration. Therefore, increasing the amount of powder mix while maintaining the same amount of water increases the concentration, as well as maintaining the same amount of powder mix but in less water. Anything else would decrease the concentration.

When considering the electrophilic addition of Br2 to isoprene (2-methyl-1,3-butadiene), the product mixture predominantly contains 3,4-dibromo-3-methyl-1-butene (21%) over 3,4-dibromo-2-methyl-1-butene (3%) due to the following reasons:

1. Regioselectivity: During the electrophilic addition reaction, the initial attack of the electrophile (Br+) to isoprene's double bond leads to the formation of two possible carbocation intermediates.
2. Carbocation stability: The intermediate carbocation that leads to the formation of 3,4-dibromo-3-methyl-1-butene is a tertiary carbocation (3°), which is more stable than the secondary carbocation (2°) leading to 3,4-dibromo-2-methyl-1-butene.
3. Hyperconjugation: The greater of the tertiary carbocation is due to hyperconjugation, which is the interaction between the adjacent C-H σ-bonds stability with the empty p-orbital of the carbocation. The tertiary carbocation has more of these stabilizing interactions than the secondary carbocation.

In conclusion, the predominance of 3,4-dibromo-3-methyl-1-butene (21%) over 3,4-dibromo-2-methyl-1-butene (3%) in the product mixture results from the greater stability of the tertiary carbocation intermediate formed during the electrophilic addition reaction of Br2 to isoprene (2-methyl-1,3-butadiene).

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If one form of a gene can mask the appearance of another form, that form is considered dominant over the other form. Option B.

According to Mendel, genes are usually made up of 2 alleles. These alleles can be the same or different. When the alleles are the same, the gene is said to be homozygous. If the alleles are different, the gene is said to be heterozygous.

When the two alleles that make up a gene are different, one will be dominant and the other will be recessive. The dominant gene masks the effect of the recessive gene. In other words, the recessive gene cannot be expressed as long as it coexists with the dominant gene. In order for it to be expressed, it has to be in two copies or a homozygous recessive form.

For the dominant allele, however, only one copy is needed for it to be expressed.

In summary, if one form of a gene can mask the appearance of another form, that form is considered dominant over the other form.

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Answer:

c. 1.0 mole C5H5N and 1.5 mole C5H5NHCl

Explanation:

We can determine pH of a buffer using H-H equation:

pH = pKa + log [A⁻] / [HA]

Where [A⁻] is concentration of conjugate base and [HA] concentration of weak acid. These concentrations can be computed as moles of each species.

We need to determine pKa of both NH₃ and C₅H₅N buffers, thus:

pKb = -log Kb

NH₃ pKb = -log 1.8x10⁻⁵ = 4.74

C₅H₅N pKb = -log 1.7x10⁻⁹ = 8.77

And pKa = 14 - pKb:

NH₃ pKa = 14 - 4.74 = 9.26

C₅H₅N pKb = 14 - 8.77 = 5.23

A buffer works only under pH's between pKa-1 and pKa + 1. As pKa NH₃ buffer is 9.23 is not possible to produce a buffer with pH 5.05 for this system.

Thus, we only will compute the buffers made with C₅H₅N:

c. 1.0 mole C5H5N (Weak base) and 1.5 mole C5H5NHCl (Conjugate acid)

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.0 moles] / 1.5 moles]

d. 1.5 mole C5H5N and 1.0 mole C5H5NHCl

pH = pKa + log [A⁻] / [HA]

pH = 5.23+ log [1.5 moles] / 1.0 moles]

Right solution is:

Answer:

Because the atom can only absorb specific amounts of energy

Explanation:

hope this helps

Answer:

b

Explanation:

Reduction is the process of gaining of electron. The equation that describes  a reduction is option b, Cl reduces Cl- by accepting an electron.

Reduction is the process of reaction with hydrogen or accepting one or more electrons. In reduction, a species reduces to its lower oxidation state. The process of losing electron is called oxidation. Elements forms their higher oxidation states in oxidation state.

Mg metal loses its two electron giving Mg²⁺ , Na metal loses its one electron giving Na+ are all oxidation. Similarly Al metal giving Al³⁺ ions is oxidation.

Atoms when gain electron, they acquire negative charges. Cl have 7 valence electrons and it need one more electron to achieve octet. Hence it gains an electron forming its lower oxidation state Cl⁻. Here, oxidation state decreases from 0 to -1.

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The most important variable to control in this experiment the type of bicycle tyre.

An experiment is a test under controlled conditions made to either demonstrate a known truth, examine the validity of a hypothesis, or determine the efficacy of something previously untried.

According to this question, Dan and Dawn wants to know if there is any difference between the mileage expected from bicycle tires from two different manufacturers.

Dan, then, conduct an experiment by putting one brand on his bike and Dawn will put the other brand on her bike.

In this experiment, the independent variable is the different mileage from different manufacturers. This means that to make this experiment a controlled one, all other variables must be kept constant.

Therefore, the most important variable to control in this experiment the type of bicycle tyre because Dan and Dawn must ensure that they use the same type of bicycle tyre.

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