Which choice best describes why a solution is called a special type of mixture? The substances in a solution can only be separated through the method called filtration. The substances in a solution look as if they mixed equally but they always separate into layers when left sitting still a long time. The substances in a solution are mixed equally throughout it and are unable to be easily separated like those in a regular mixture. The substances in a solution are mixed unequally but they can still easily be separated just like those in a regular mixture.

Answer: The answer should be C.

Explanation:

Only example of gathering scientific info.

Answer:

Explanation:

Search it trust me i did and i got all the answers

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 substance mixture can be sperate by filtration, distillation, and freezing.

Answer:

3.39 mol

Explanation:

n = m/M, where n is moles, m is mass and M is molar mass.

n = 149/44.01

n = 3.38559418314 mol

n = 3.39 mol

Hope that helps

Answer:

I think he was right but not explaining

Explanation:

I think it is C cause.... the volume of a material is the amount of matter that matterial can hold. it should the the amount of space the whole material takes up.

so C is the answer.

pls make this the brainliest.

not because it is, but because I asked.

The mass of P4O10 formed when 225 g of PH3 reacts with excess oxygen is 470 g, the correct option is c. 470 g.

The balanced equation for the reaction between PH3 and oxygen to give P4O10 is shown below:

4PH3(g) + 5O2(g) → P4O10(s) + 6H2O(l)

From the balanced equation, 4 moles of PH3 requires 5 moles of O2 to give 1 mole of P4O10, which means that 1 mole of PH3 requires 5/4 moles of O2 to give 1/4 mole of P4O10.

The molar mass of P4O10 is calculated as follows:

Atomic mass of P = 30.97 × 4 = 123.88

Atomic mass of O = 15.999 × 10

= 159.99

Molar mass of P4O10 = 123.88 + 159.99

= 283.87 g/mol

Now, calculate the number of moles of PH3 in 225 g:

mass of PH3 = 225 g

Molar mass of PH3 = 33.998 g/mol

No. of moles of PH3 = mass/molar mass

= 225/33.998

= 6.6185 mol

From the equation, 4 moles of PH3 gives 1 mole of P4O10.So, 6.6185 moles of PH3 gives

6.6185/4 = 1.6546

moles of P4O10

The mass of P4O10 formed when 225 g of PH3 reacts with excess oxygen is calculated as follows:

Mass of P4O10 formed = moles of P4O10 × molar mass

= 1.6546 mol × 283.87 g/mol

= 469.7 g

Approximately, the mass of P4O10 formed when 225 g of PH3 reacts with excess oxygen is 470 g.

Therefore, the correct option is c. 470 g.

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ano ang naakit sa isang tao..at kung ano ang iyong kasarian ay

The compound you provided is a linear chain of alkenes and it has two C=C units.

C=C1: This is the first C=C unit in the compound, it is located between the first and the second carbon atoms. This unit is not stereoisomeric because it is not in a cyclic structure and it does not have different groups on either side of the double bond.C=C2: This is the second C=C unit in the compound, it is located between the seventh and the eight carbon atoms. This unit is also not stereoisomeric because it is not in a cyclic structure and it does not have different groups on either side of the double bond.

In summary, both C=C units in the compound are not stereoisomeric.

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Actually If you look very close to a plant you see this:

And to answer your question leaves are green due to sun nutrients water and im not sure  what else

Answer:

D

Explanation:

First, we write down our reaction:

N2 + 3H2 → 2NH3

Don't forget to balance it.

We only use moles as units.

Procedure:

3 x 1 mole H2 ------------ 2 x 1 mole NH3

3.1 moles H2 ------------- x

x = 2.1 moles NH3 are produced

Answer: 2.1 moles NH3

Answer:

R = 8.314 pKa*L/mol*K

The value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

To determine the value for the ideal gas constant (R) when pressure (P) is in kilopascals (kPa), temperature (T) is in kelvins (K), volume (V) is in liters (L), and amount of gas (n) is in moles, we need to use the appropriate units for R based on these measurements.

The ideal gas constant, R, can be expressed in various units. The most common units for R are:

R = 0.0821 L·atm/(mol·K) (atmospheres, liters, moles, and kelvins)

However, since you provided the measurements in kilopascals, liters, moles, and kelvins, we need to use a different value for R that is consistent with these units:

R = 8.314 kPa·L/(mol·K)

Therefore, when pressure is in kilopascals, volume is in liters, amount of gas is in moles, and temperature is in kelvins, the value for the ideal gas constant (R) is approximately 8.314 kPa·L/(mol·K).

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It is accurate to say that Kentucky bluegrass is more heat-resistant than annual bluegrass.

All the cool-season grasses typical of northern lawns offer some degree of cold endurance, but Kentucky bluegrass is the most resilient, enduring the bitter winter temperatures. Excellent cold tolerance is another quality of fine fescue. Compared to Kentucky bluegrass, creeping bentgrass is more resistant to submersion. In general, cool-season turfgrasses are more tolerant to shade than warm-season turfgrasses. The Augustinegrass is the most tolerant of shade. Of all maintained turfgrasses, bermudagrass requires the most light, followed by carpetgrass, bahiagrass, zoysiagrass, centipedegrass, Kentucky bluegrass, tall fescue, and red fescue. Although centipedegrass is marginally more cold tolerant than St. Augustine grass, prolonged exposure to temperatures of 5°F or lower can cause centipedegrass to die.

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1.  the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.  the final concentration of KOH after adding 550 mL of water to 125 mL of 3.01 M KOH solution is approximately 0.557 M.

1.) If 125 mL of water is added to 45.3 mL of a 0.71 M NaOH solution, the resulting solution will be a diluted NaOH solution. The addition of water will increase the total volume while reducing the concentration of NaOH. To determine the final concentration of NaOH, we need to consider the conservation of moles.

First, let's calculate the moles of NaOH in the initial solution:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.0453 L × 0.71 M = 0.0321433 moles

After adding 125 mL (0.125 L) of water, the total volume of the solution becomes 0.0453 L + 0.125 L = 0.1703 L.

To find the final concentration, we divide the moles of NaOH by the total volume:

final concentration of NaOH = moles of NaOH / total volume

final concentration of NaOH = 0.0321433 moles / 0.1703 L ≈ 0.189 M

Therefore, the final concentration of NaOH after adding 125 mL of water to 45.3 mL of 0.71 M NaOH solution is approximately 0.189 M.

2.) If 550 mL of water is added to 125 mL of a 3.01 M KOH solution, the resulting solution will also be a diluted solution. Again, we will apply the conservation of moles to determine the final concentration of KOH.

First, calculate the moles of KOH in the initial solution:

moles of KOH = volume (in L) × concentration (in M)

moles of KOH = 0.125 L × 3.01 M = 0.37625 moles

After adding 550 mL (0.55 L) of water, the total volume of the solution becomes 0.125 L + 0.55 L = 0.675 L.

To find the final concentration, divide the moles of KOH by the total volume:

final concentration of KOH = moles of KOH / total volume

final concentration of KOH = 0.37625 moles / 0.675 L ≈ 0.557 M

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If 4.000 g of sample 1 were added to the water instead of 2.000 g, the freezing point depression of the water would increase.

Freezing point depression is a phenomenon that occurs when a solute is dissolved in a solvent, such as water. The presence of solute molecules in the solvent interferes with the formation of ice crystals, causing the solution's freezing point to decrease. The magnitude of the freezing point depression is directly proportional to the concentration of solute in the solution. This means that if the amount of solute increases, the freezing point depression will also increase. If adding 4.000 g of sample 1 instead of 2.000 g, the concentration of the solute in the water will be higher, leading to a greater depression of the freezing point. This means that the water will freeze at a lower temperature than it would if only 2.000 g of sample 1 were present.

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If 4.000 g of sample 1 were added to the water instead of 2.000 g, the freezing point depression of the water would increase.

Freezing point depression is a phenomenon that occurs when a solute is dissolved in a solvent, such as water. The presence of solute molecules in the solvent interferes with the formation of ice crystals, causing the solution's freezing point to decrease. The magnitude of the freezing point depression is directly proportional to the concentration of solute in the solution. This means that if the amount of solute increases, the freezing point depression will also increase. If adding 4.000 g of sample 1 instead of 2.000 g, the concentration of the solute in the water will be higher, leading to a greater depression of the freezing point. This means that the water will freeze at a lower temperature than it would if only 2.000 g of sample 1 were present.

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The correct chemical formula for nitrogen gas is N2. For example, "Nitrogen gas is one of the diatomic elements, in which one molecule consists of two atoms of the same element bonded by one or more covalent bonds."

Answer:

down

Explanation:

The atomic number is the number of protons in the nucleus of an atom. The number of protons define the identity of an element (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).

An atom consists of electrons, protons, and neutrons. The protons and neutrons are present inside the nucleus of an atom whereas the electrons revolve around the nucleus of an atom.

The number of protons in an atom represents the atomic number of that particular atom. Further, this atomic number determines the place of each atom in the periodic table and its chemical properties.

For example, the mass number of sodium atom is 23 that is number of protons and neutrons. The atomic number of sodium is 11 that means there are 11 protons. The number of neutrons will be 23 - 11 = 12.

ΔS is positive for the reaction A. 2H2 (g) + O2 (g) → 2H2O (g).

The entropy change (ΔS) is related to the degree of disorder or randomness of a system. Generally, the higher the degree of disorder, the higher the entropy change. Based on this, we can predict the sign of ΔS for each reaction:

A. 2H2(g) + O2(g) → 2H2O(g): This reaction involves the formation of two molecules from three, which implies an increase in the degree of disorder, and therefore, ΔS is positive.B. CO2(g) → CO2(s): This reaction involves the formation of a solid from a gas, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

C. 2NO2(g) → N2O4(g): This reaction involves the formation of a larger molecule from two smaller ones, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

D. BaF2(s) → Ba2+(aq) + 2F-(aq): This reaction involves the dissolution of a solid into ions in solution, which implies an increase in the degree of disorder, and therefore, ΔS is positive.

E. 2Hg(l) + O2(g) → 2HgO(s): This reaction involves the formation of a solid from a liquid and a gas, which implies a decrease in the degree of disorder, and therefore, ΔS is negative.

Therefore, the answer is A. 2H2(g) + O2(g) → 2H2O(g).

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ΔS is positive for the reaction A. 2H2 (g) + O2 (g) → 2H2O (g), as the number of gas molecules decreases from 3 to 2, resulting in an increase in entropy. In option B, the phase change from gas to solid results in a decrease in entropy.

Option C is a reversible reaction and does not change the number of gas molecules, so there is no change in entropy. Option D is a dissolution reaction, which can either increase or decrease entropy depending on the specific conditions. Option E involves a phase change from liquid to solid, resulting in a decrease in entropy.
For which reaction ΔS is positive. ΔS refers to the change in entropy, which is a measure of the disorder in a system. A positive ΔS means an increase in disorder.

Reaction D, BaF2 (s) → Ba2+ (aq) + 2F- (aq), has a positive ΔS. In this reaction, a solid compound dissociates into its ions, which are dispersed in the aqueous solution. This increases the disorder of the system.

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Answer:

2,5,6-trimethyloctane

Explanation:

1) Count the number of carbons in the longest chain. If the structure contains a functional group (e.g. double bond, -OH), they have to be part of the chain that you're counting.

• The straight chain is the longest chain, and it contains 8 carbons

• Without the additional 3 methyl (-CH₃) substituents, it would be called octane (since it is an alkane)

2) Assign location numbers for the substituents, ensuring that they are the lowest possible numbers

• From left to right, we could name it as 2,5,6-trimethyloctane

• From right to left of the parent chain, it would be called 3,4,7-trimethyloctane

• Assigning from left to right gives us the lowest location numbers as the sum of the numbers is 13 instead of 14

• Remember to add 'tri' since we have 3 methyl groups

Answer: movement of continent

Explanation:

The Movement of Continents affects the global patterns of winds and ocean currents, which slowly changes climates.

We should note that the ocean currents moves water from the equator and moves them toward the poles and vice versa. This therefore leads to the regulation of ocean currents. This in turn, lead to changes in the climates.

(a)The pH of the fruit juice solution is approximately 3.5. (b) The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(b)The hydrogen ion concentration of the tomato solution is 0.001 mol/L.

(a). The hydrogen ion concentration of the fruit juice is 0.0003 mol/L. We can determine the pH of the solution using the formula pH = -log[H⁺].

pH = -log(0.0003)

pH ≈ -log(3 × 10⁻⁴)

Using a calculator, we can calculate the logarithm:

pH ≈ -(-3.5229) (rounded to the nearest tenth)

pH ≈ 3.5

Therefore, the pH of the fruit juice solution is approximately 3.5.

(b). A tomato has a pH of 3.0. We can determine the hydrogen ion concentration of this solution by rearranging the formula pH = -log[H⁺] to solve for [H⁺].

[H⁺] = 10(-pH)

[H⁺] = 10⁻³

[H⁺] = 0.001 mol/L

Therefore, the hydrogen ion concentration of the tomato solution is 0.001 mol/L.

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Alcohol is a teratogen from the given options, which is responsible for fetal harm. The correct option to this question is C.

A well-known teratogen, alcohol intake during pregnancy can have negative consequences on the developing fetus.

Alcohol is a proven carcinogen that kills cells in a growing fetus and a teratogen that changes the cell cycle and function in a fetus's brain, with PAE having rapid and long-lasting impacts on someone with FASDs.

Any substance that exposes a fetus to an abnormality while the mother is pregnant is considered a teratogen. Teratogens are typically identified following an increase in the prevalence of a specific birth abnormality. For instance, a medication called thalidomide was prescribed to alleviate morning sickness in the early 1960s.

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The neurons of the somatic nervous system that control the skeletal muscles are called as the motor neurons.

The motor neurons of the spinal cord are the part of the central nervous system  and it is connect to the muscles, the glands and the organs throughout the body. These neurons will transmit the impulses from the spinal cord to the skeletal and the smooth muscles like as those in the stomach, and it is directly control the all of the our muscle movements.

Thus, the motor neurons are the neurons in the somatic nervous system that will control all the skeletal muscles.

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Answer:

404.8g of (NH4)HSO4 is produced.

Explanation:

Step 1:

Data obtained from the question. This include the following:

Temperature (T) = 10°C = 10°C + 273 = 283K

Pressure (P) = 110KPa = 110/101.325 = 1.09atm

Volume (V) = 75L

Step 2:

Determination of the number of mole of ammonia, NH3.

The number of mole (n) of ammonia, NH3 can be obtained by using the ideal gas equation. This is illustrated below:

Note:

Gas constant (R) = 0.0821atm.L/Kmol

Number of mole (n) =?

PV = nRT

1.09 x 75 = n x 0.0821 x 283

Divide both side by 0.0821 x 283

n = (1.09 x 75) /(0.0821 x 283)

n = 3.52 moles

Step 3:

Determination of the number of mole ammonium hydrogen sulfate produced from the reaction.

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

NH3 + H2SO4 —> (NH4)HSO4

From the balanced equation above,

1 mole of NH3 produced 1 mole of (NH4)HSO4

Therefore, 3.52 moles of NH3 will also produce 3.52 moles of (NH4)HSO4.

Therefore, 3.52 moles of ammonium hydrogen sulfate, (NH4)HSO4 is produced.

Step 4:

Conversion of 3.52 moles of ammonium hydrogen sulfate, (NH4)HSO4 to grams. This is illustrated below:

Molar Mass of (NH4)HSO4 = 14 + (4x1) + 1 + 32 + (16x4) = 115g/mol

Number of mole of (NH4)HSO4 = 3.52 moles

Mass of (NH4)HSO4 =..?

Mass = mole x molar Mass

Mass of (NH4)HSO4 = 3.52 x 115 = 404.8g

Therefore, 404.8g of (NH4)HSO4 is produced.