The growth of a certain plot was measured over a period of more than a month. How many centimeters did the plant grow between day 10 and day 30. 0.5 cm 1.0 cm 1.5 cm 2 cm

Answer:

A heterogeneous mixture is a mixture in which the composition is not uniform throughout the mixture

Answer:

A. 2.65 atm.

B. 18.11 g/L.

Explanation:

A. Determination of the pressure

Mass of N₂O = 21.3 g

Volume = 5.76 L

Temperature (T) = 111 °C

Pressure (P) =.?

First, we shall determine the number of mole in 21.3 g of dinitrogen monoxide, N₂O. This can be obtained as follow:

Mass of N₂O = 21.3 g

Molar mass of N₂O = (14×2) + 16

= 28 + 16

= 44 g/mol

Mole of N₂O =?

Mole = mass /Molar mass

Mole of N₂O = 21.3/44

Mole of N₂O = 0.484 mole

Next, we shall convert 111°C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Temperature (T) = 111 °C

Temperature (T) = 111 °C + 273

Temperature (T) = 384 K

Finally, we shall determine the pressure. This can be obtained as follow:

Number mole of N₂O = 0.484 mole

Volume = 5.76 L

Temperature (T) = 384 K

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

Pressure (P) =.?

PV = nRT

P × 5.76 = 0.484 × 0.0821 × 384

Divide both side by 5.76

P = (0.484 × 0.0821 × 384) / 5.76

P = 2.65 atm

B. Determination of the density of CFCl₃

Temperature (T) = 157°C

Pressure (P) = 4.65 atm.

Density of CFCl₃ =?

First, we shall determine the molar mass of CFCl₃. This can be obtained as follow:

Molar mass of CFCl₃ = 12 + 19 + (35.5×3)

= 12 + 19 + 106.5

= 137.5 g/mol

Next, we shall convert 157°C to Kelvin temperature. This can be obtained as follow:

T(K) = T(°C) + 273

Temperature (T) = 157 °C

Temperature (T) = 157 °C + 273

Temperature (T) = 430 K

Finally, we shall determine the density of CFCl₃. This can be obtained as follow:

Temperature (T) = 430 K

Pressure (P) = 4.65 atm.

Molar mass of CFCl₃ (M) = 137.5 g/mol

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

Density (D) of CFCl₃ =?

D = PM / RT

D = (4.65 × 137.5) / (0.0821 × 430)

D = 18.11 g/L

Answer:

The Hawaiian Islands are a very small section of a huge chain of volcanic islands that crosses the northern half of the Pacific Ocean, called the Hawaiian-Emperor Volcanic Island Chain, which is over 6,000 kilometres long. The chain is linear, with a large bend in the middle: the southern half is called the Hawaiian Ridge and the northern half is called the Imperial Seamount.

Explanation:

Answer: Oxygen

Explanation: Its found on the periodic table as an element.

The standard deviation of the sample is 0.579, rounded to the correct number of significant figures.

To calculate the standard deviation of the sample, we need to follow these steps:

To find the mean, we sum up all the data points and divide by the number of data points. Let's calculate it:

(3.09 + 4 + 2.775 + 2.5 + 3.80) / 5 = 16.165 / 5 = 3.233

To do this, we subtract the mean (3.233) from each data point and square the result:

(3.09 - 3.233)^2 = 0.020049

(4 - 3.233)^2 = 0.586489

(2.775 - 3.233)^2 = 0.209025

(2.5 - 3.233)^2 = 0.537289

(3.80 - 3.233)^2 = 0.323329

To find the variance, we sum up the squared differences from step 2 and divide by the number of data points:

(0.020049 + 0.586489 + 0.209025 + 0.537289 + 0.323329) / 5 = 1.676181 / 5 = 0.3352362

√0.3352362 = 0.579 (rounded to three significant figures)

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I belive that the answer to your question is #4, "Light, sound, chemical, and thermal.

Thus, in order for 24.4 grammes of lead(II) sulphide to react, 9.79 grammes of oxygen are needed.

Sulfur dioxide gas and solid lead (II) oxide are created when solid lead (II) sulphide interacts with oxygen gas. 2PbO(s) + 3 Oxygen (g) 60.0 g of oxygen are required in total to react with 38.1 g of lead(II) sulphide.

The balanced chemical equation for the reaction between oxygen (O₂) and lead(II) sulphide (PbS) is:

                        PbS + 3O₂ → PbSO₄

First, let's calculate the number of moles of lead(II) sulfide:

molar mass of PbS = 207.2 g/mol + 32.1 g/mol

                        = 239.3 g/mol

moles of PbS = 24.4 g / 239.3 g/mol

                             = 0.102 mol

moles of O₂ = 3 × moles of PbS

                         = 3 × 0.102 mol

                             = 0.306 mol

Finally, we can convert the number of moles of oxygen to grams:

     molar mass of O₂ = 32.0 g/mol

mass of O₂ = moles of O₂ × molar mass of O₂

                   = 0.306 mol × 32.0 g/mol

                                = 9.79 g

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Material from meteorites are not the elements used to make models of interstellar medium. The correct option is A.

The matter and radiation that prevail in the space between star systems in a galaxy are referred to as the interstellar medium in astronomy. This matter consists of gas including ionic, atomic, and molecular, dust, and cosmic rays.

Meteorite material is not used to create models of the interstellar medium.

Thus, the correct option is A.

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Explanation:

2,4-DNP is negative: aldehyde and ketone absent

Chromic acid is negative: alcohol absent.

KMnO4 test negative: alkene absent

The only positive result is for Fe(OH)2.

Nitro group-containing compounds react with ferrous hydroxide to give amine and ferric hydroxide red ppt. Hence given compound contains the nitro group (-NO2).

In the simile "Ben swallowed the sandwiches like a snake," the two things being compared are Ben (the subject of the sentence) and a snake.

The important qualities of a snake in this metaphor are its swallowing behavior and the speed at which it devours its prey.

A metaphor is a figure of speech that makes a comparison between two unrelated things, objects, or concepts, highlighting a similarity between them. Unlike similes, which use words such as "like" or "as" to make a direct comparison, metaphors state that one thing is another.

Snakes are known for their ability to consume their prey whole and quickly, using their flexible jaws and swallowing mechanism.

Therefore, the important quality of the snake in the metaphor is swallowing.

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Complete question:

Answer the questions about this simile: "Ben swallowed the sandwiches like a snake."

What two things are being compared?

What are the important qualities of a snake in this metaphor?

Answer:

Its a compound :PP

Explanation:

have a good day

Answer:

Compound

Explanation:

Answer:

Below

Explanation:

Each liter contains .591 moles

   each mole is 6.02 x 10^23 particles

.591   x   6.02 x 10^23  = 3.56 x 10^23 particles

"All matter is made of tiny particles called atoms" is considered a scientific theory. Therefore the correct option is (B)

A scientific theory is a well-substantiated explanation of a natural phenomenon that has been repeatedly tested and confirmed through observation, experimentation, and data analysis.

From the statements in the question above, we can see that Option (B)  is a well-established and widely accepted explanation of a natural phenomenon that has been extensively tested through observation and experimentation.

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Answer:

Explanation:

These are daily things u use

How temperature and air pressure play a role in creating wind.

Gases move from high-pressure areas to low-pressure areas. And the bigger the difference between the pressures, the faster the air will move from the high to the low pressure. That rush of air is the wind we experience.

hope it helps.

Aliyyah.

Winds are created by the change in temperature gradient which results in the difference in pressure causes the circulation of air from high pressure area to low pressure area that is called winds.

Wind is the circulation or passage of air from one region to the other over a pressure gradient. The pressure gradient is resulting from the uneven heating of the atmosphere.

According to Gay- Lussac's  law, the pressure of a gas is directly proportional to the temperature of the region. Thus as the temperature over an area increases pressure also increases.

The heat radiated from the sun is unevenly distributed in the earth atmosphere results in difference in pressure also. To balance this pressure difference, the air from high pressure region passes to low pressure region creating the winds.

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Based in the data provided, the percentage by mass of K2SO4 is 60.55 %.

The mass of K2SO4 in the mixture is obtained from the data given as follows:

Total mass of sample = 0.649 g

Let the mass of K2SO4 in the mixture be X g

Mass (NH4)SO4 = (0.649 - X )g

Moles of K2SO4 = X g/174.25 g/mol

= 0.00574X mol

Moles of (NH4)2SO4 = (0.649 - X)g / 132.13 g/mol

= (0.00491 - 0.00757X) mol

Total number of moles SO42- ions precipitated = 0.00574X mol + (0.00491 - 0.00757X)mol

= (0.00491-0.00183X) mol

Mole ratio of SO42- ions to Ba2+ ions = 1:1

Thus, moles of Ba2+ ions = (0.00491 - 0.00183X)mol

Moles of BaSO4 precipitated = 0.977 g/233.38 g/mol = 0.00419 moles

1 mole of BaSO4 produces 1 mole of Ba2+ ions

Therefore,

(0.00491 - 0.00183X) mol = 0.00419mol

0.00183X = 0.00491 - 0.00419mol

0.00183X = 0.00072

X = 0.00072/0.00183 = 0.393 g

Mass of K2SO4 = 0.393 g

Percentage by mass of K2SO4 = (0.393/0.649) × 100

Percentage by mass of K2SO4 = 60.55 %

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All the element have their own unique color because the every element have their own set of energy levels.

According to the bohr model of atoms : electrons exist at certain energy levels. when we give heat to electron , it gets excited and moves from lower energy level to higher energy level. the electron is less stable in higher energy level. when an electron returns from higher energy level to lower energy level it emits some energy in form of radiation. The wavelength of light depends upon energy level . and every elements have their own unique energy levels.  The color for different element is different.

Thus, All the element have their own unique color because the every element have their own set of energy levels.

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Answer:

The concentration would be 0.76 mol/L.

The most common way to solve this problem is to use the formula

c1V1=c2V2

In your problem,

c1 = 4.2 mol/L; V1 = 45.0 mL

c2 = ?; V2 = 250 mL

c2=c1×V1V2 = 4.2 mol/L × 45.0mL250mL = 0.76 mol/L

This makes sense. You are increasing the volume by a factor of about 6, so the concentration should be about ¹/₆ of the original (¹/₆ × 4.2 = 0.7).

Explanation:

if it is helpful...... plzz like and follow

Answer:

Answer is shown on the paper :D

Explanation:

Remember to follow sig-figs.

Answer: 51.9961 g/mol, don't know if it helps :)

Explanation:

Answer:

Chromium is a steel-gray, lustrous, hard metal that takes a high polish, is fusible with difficulty, and is resistant to corrosion and tarnishing.

The most common oxidation states of chromium are +2, +3, and +6, with +3 being the most stable. +4 and +5 are relatively rare. Chromium compounds of oxidation state 6 are powerful oxidants.ion:

The volume of the acid that we are going to need in this case is 27000 mL.

We know that we have to know the reaction equation as this is the first step to solve the problem that we have here;

We know that;

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Then we have that;

Molarity of the acid = Antilog (-1.55)

= 0.028 M

Number of moles of the base;

38 g/100 g/mol

= 0.38 moles

If 1 mole of the base reacts with 2 moles of the acid;

0.38 moles of the base reacts with 0.38 * 2/1

= 0.76 moles

Then;

Number of moles = Concentration * volume

Volume = Number of moles/Concentration

= 0.76/ 0.028

= 27 L or 27000 mL

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Answer:

A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it. The plateaus on the curve mark the phase changes.The second change of phase is boiling, as the temperature stays the same during the transition to gas.

Explanation:

The general equation for this reaction is as follows: CO3^2- + 2H+ → CO2 + H2O.

The test for trioxocarbonate (IV), also known as carbonate (CO3) ions, involves the reaction with an acid. When carbonate ions react with an acid, carbon dioxide gas (CO2) is produced, which can be observed through effervescence or bubbling. The general equation for this reaction is as follows:

CO3^2- + 2H+ → CO2 + H2O

In this equation, CO3^2- represents the carbonate ion, and H+ represents the hydrogen ion from the acid. The reaction produces carbon dioxide gas (CO2) and water (H2O).

For example, if hydrochloric acid (HCl) is used in the test, the reaction equation would be:

CO3^2- + 2HCl → CO2 + H2O + 2Cl-

In this case, the carbonate ions react with hydrochloric acid to produce carbon dioxide gas, water, and chloride ions.

It's important to note that the specific acid used in the test may vary depending on the experimental setup. Common acids used include hydrochloric acid (HCl), sulfuric acid (H2SO4), or acetic acid (CH3COOH).

The reaction equation remains the same, with the acid being consumed in the reaction and contributing to the formation of water and an anion corresponding to the acid used (such as chloride, sulfate, or acetate ions).

By observing the effervescence or bubbling produced during the reaction, we can confirm the presence of carbonate ions in the sample being tested.

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The aqueous solution is represented by the symbol (aq). Aqueous solution (aq) denotes a substance that has been dissolved in water.

Water acts as the solvent in an aqueous solution. In balanced chemical equation, it is frequently expressed by appending to the corresponding chemical formula. For instance, Na+ + Cl might be used to depict a solution of table salt, or sodium chloride, in water.Aqueous solutions are composed of both water and one or more dissolved substances, Solid, gases, or other liquids can all dissolve in an aqueous solution

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Anions can affect the results of combustion tests. For example, copper compounds with non-halides produce green flames, while copper halides produce blue-green flames. To become a neutral chlorine atom again, it must lose an extra electron.

Metal chlorides evaporate under a flame giving a lighter color Color can be used to identify metal ions. Chlorine atoms do not emit energy in the visible light range. When metal ions and metal chlorides are placed under a flame, the electrons gain energy. Sodium chloride gives the flame a bright yellow-orange color.

Most of his lab manuals state that metallic cations in ionic compounds are usually responsible for the color in combustion tests, and students corroborate this fact. This exercise also demonstrates the importance of controlling variables and making meaningful comparisons.

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pH is defined as the negative logarithm (base 10) of the hydrogen ion concentration ([H+]) in a solution. Therefore, option (C) is correct.

In other words, the pH scale measures the acidity or basicity of a solution. The lower the pH value, the more acidic the solution is, and the higher the pH value, the more basic or alkaline the solution is.

For example, pure water has a pH of 7, which is considered neutral, meaning it is neither acidic nor basic. Acids have pH values lower than 7, while bases have pH values greater than 7. The pH scale is important in many areas of chemistry, including biochemistry, environmental science, and medicine.

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So, the correct answer is D) Te (Tellurium). Among the given options, Te is located closest to the top right corner of the periodic table, where the effective nuclear charge is highest and the atomic radius is smallest, resulting in the highest electron affinity.

The increase in electron affinity can be explained by the increase in effective nuclear charge (the positive charge felt by the electrons in the outermost shell) and the decrease in atomic radius.Among the given atoms, the one with the highest electron affinity would be the one that is closest to the top right corner of the periodic table, where the effective nuclear charge is highest and the atomic radius is smallest.

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