Biologists designed an experiment to test the effect of compost on the development of root crops. They tested several different crops, including carrots, potatoes, beets, and onions. They grew most of the plants in the greenhouse, but due to space issues, they had to grow some outdoors. They gave all the plants the same amount of compost. They obtained the compost from a local farmer and from the local hardware store. They ran out of the farmer’s compost, so some of the plants received that compost when the seeds were planted and other plants got hardware store compost after the plants had already started growing.

RESULTS: Some of the roots seemed really big. Other roots seemed normal or small.

CONCLUSION: They couldn’t tell what the effect of the compost was because the results were inconsistent.

What are five problems with this experimental design that could have caused inconsistent results?

Answer:

1,2, and 3

Explanation:

I hope this answered your question!

Answer:The unstable nucleus of radioactive atoms emit radiation. When this occurs, a new atom and element are formed. This process is called radioactive decay. It continues until the forces in the unstable nucleus are balanced.

Explanation:

From the given information, approved eye protection is to be worn for certain experiments. Eye protection is an important safety measure in laboratories and other settings where hazardous materials or equipment are used.

However, it is not necessary to wear eye protection all the time, only when it is necessary to protect the eyes from specific hazards. For example, eye protection may be required when working with chemicals that can splash or when using equipment that can produce flying debris or particles.

It is important to follow the specific safety guidelines and regulations for your particular laboratory or workplace. These guidelines will specify when eye protection is required and what type of eye protection is appropriate for the task at hand. It is always better to err on the side of caution and wear eye protection when in doubt.

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Answer:

\(\boxed {\boxed {\sf 1, 242 \ N}}\)

Explanation:

According to Newton's Second Law of Motion, force is the product of mass and acceleration.

\(F=ma\)

In this formula, F is the force, m is the mass, and a is the acceleration.

The mass of the object is 540 kilograms and the acceleration is 2.3 meters per second squared.

Substitute the values into the formula.

\(F=(540 \ kg)(2.3 \ m/s^2)\)

Multiply.

\(F=1242 \ kg*m/s^2\)

Conver the units. 1 kilogram meter per second squared is equal to 1 Newton. Therefore, our answer of 1242 kilogram meters per second square is equal to 1242 Newtons.

\(F= 1242 \ N\)

The force of the object is 1242 Newtons.

Answer:

5.1 moles of P2O3 are required

Explanation:

Based on the reaction, 1 mole of diphosphorus trioxide, P2O3, reacts with 3 moles of water to produce 2 moles of phosphorous acid, H3PO3. That means the conversion factor is: 1mol P2O3 = 2mol H3PO3.

The moles of P2O3 required to produce 10.2mol H3PO3 are:

10.2mol H3PO3 * (1mol P2O3 / 2mol H3PO3) =

Answer:Benzene is one of the ost commonly known aromatic compounds.Benzene is a solvent so they is no solute for it.

Explanation:mole fraction of solute in benzene is 0.5

4°c, the temperature of maximum density for water.

Below that point, the crystalline lattice starts to form and the water begins to expand. The density decreases above that temperature as a result of the elevated molecular vibrational activity.

Temperature is a numerical expression of how hot a substance or radiation is. There are three different kinds of temperature scales: those that depend only on macroscopic properties and thermodynamic principles, like Kelvin's original definition; those that depend only on practical empirical properties of particulate matter rather than theoretical principles; and those that depend on the average translational kinetic energy per freely moving microscopic particle, such as an atom, molecule, or electron, in a body, like the SI scale.

A thermometer is used to determine temperature. It is calibrated using a variety of temperature scales, each of which has a distinct historical definition determined by a specific set of reference points and thermometric materials. The Celsius scale is the most widely used scale.

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When an electrolyte dissolves in water, the resulting solution conducts an electric current.

Answer:

if my calculation are correct, it's 295 grams

Explanation:

because liters converted to grams is .1=100 so if you take 2.95 times 100, it equals 295

Answer:

3.384364 time 10^24 atoms

Explanation:

multiply by avogadro's number

The expression that can be used to find the value of B in square inches for this cylinder is A) π(8.3)2.

The combined area of a cylinder's curving surface and its two circular bases is known as the cylinder's area. The surface area of a cylinder is determined using the following formula:

A = 2πrh + 2πr²

We need to find the expression to calculate the area of the base of the given cylinder, which has dimensions r = 8.3 meters and h = 11.1 meters.

The formula for the area of the base of a cylinder is B = πr², where r is the radius of the base of the cylinder.

So, substituting the given value of r, we get:

B = π(8.3) ²

Simplifying this expression, we get:

B = π(68.89)

B = 68.89π.

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hi myself thx for the answers

Energy gets  from motion is called kinetic energy and  energy due to  position is called potential energy.

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Answer:

D.) Thermal energy

Explanation:

I got it correct on founders edtell

Answer:

1 HBr + 1 KOH -> 1 KBr + 1 H2O

Explanation:

132 gm of CO₂ is generated by combustion of 342 gm of C₈H₁₈.

The molar mass of a chemical compound is defined as the ratio between the mass and the amount of that substance in any sample. A material's molar mass is a bulk characteristic rather than a molecular one.

The molar mass of a substance is its mass expressed in grams per mole. G/mol, or grams per mole, is the sign for molar mass. The ratio between the mass of an isotope and the mass of the isotope carbon is known as the isotopic atomic mass, or mass of a single isotope of any particular element. -12

The reaction is :

C₈H₁₈ + 12.5O₂ ----> 8CO₂ + 9H₂O

Molar mass of C₈H₁₈ is = 12*8 + 18*1 = 114 gm

Molar mass of CO₂ is = 12+ 16*2 = 44gm

44gm of CO₂ is generated by 114 gm of C₈H₁₈

1 gm of CO₂ is generated by 114/44 gm of C₈H₁₈

132 gm of CO₂ is generated by combustion of 114*132/44 = 342 gm of C₈H₁₈

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Answer:

a. 2433 kJ/mol

b. 93 kJ/mol

Explanation:

a) To calculate the enthalpy change of the reaction, we need to use the bond energies of the reactants and products. The enthalpy change is the difference between the energy required to break the bonds in the reactants and the energy released when new bonds are formed in the products. Using the bond energies given:

Reactants:

N≡N: 1 × 945 kJ/mol = 945 kJ/mol

H-H: 3 × 436 kJ/mol = 1308 kJ/mol

Products:

N-H: 2 × 391 kJ/mol = 782 kJ/mol

N-H: 2 × 391 kJ/mol = 782 kJ/mol

N-H: 2 × 391 kJ/mol = 782 kJ/mol

The balanced equation for the reaction is:

N2 + 3H2 → 2NH3

The total energy required to break the bonds in the reactants is:

945 kJ/mol + 1308 kJ/mol = 2253 kJ/mol

The total energy released when new bonds are formed in the products is:

2 × 782 kJ/mol + 2 × 782 kJ/mol + 2 × 782 kJ/mol = 4686 kJ/mol

Therefore, the enthalpy change for the reaction is:

ΔH = energy released - energy required = 4686 kJ/mol - 2253 kJ/mol = 2433 kJ/mol

b) The enthalpy change for the reverse reaction can be calculated using the same approach. The balanced equation for the reverse reaction is:

2NH3 → N2 + 3H2

The total energy required to break the bonds in the products is:

N2: 1 × 945 kJ/mol = 945 kJ/mol

H-H: 3 × 436 kJ/mol = 1308 kJ/mol

The total energy released when new bonds are formed in the reactants is:

N-H: 6 × 391 kJ/mol = 2346 kJ/mol

Therefore, the enthalpy change for the reverse reaction is:

ΔH = energy released - energy required = 2346 kJ/mol - 2253 kJ/mol = 93 kJ/mol

Note that the enthalpy change for the reverse reaction is much smaller than for the forward reaction. This means that the forward reaction is more exothermic and thus more favorable than the reverse reaction.

When the speed of the particle is close to that of light, it's observed mass would be infinitely large.

To answer the question, we need to know what observed mass is.

This is the mass the body of an object in relativistic motion appears to have.

So, observed mass, m' = m/√(1 - β²) where

Now, since the speed of the particle is close to that of light, β ≅ 1.

So, m' = m/√(1 - β²)

m' = m/√(1 - 1²)

m' = m/√(1 - 1)

m' = m/√0

m' = m/0

m' = ∞

So, when the speed of the particle is close to that of light, it's observed mass would be infinitely large.

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The major products formed when benzene reacts with the following reagents are :

(a) tert-butylbenzene

(b) bromobenzene

(c) mixture (ortho-nitrobenzene, meta-nitrobenzene, para-nitrobenzene)

(d) benzaldehyde

(e) nitrobenzene

(a) The major product formed when benzene reacts with tert-butyl bromide and \(AlCl_3\) is tert-butylbenzene.

(b) The major product formed when benzene reacts with bromine and a nail (iron) is bromobenzene.

(c) The major product formed when benzene reacts with iodine and \(HNO_3\) is a mixture of ortho-nitrobenzene, meta-nitrobenzene, and para-nitrobenzene.

(d) The major product formed when benzene reacts with carbon monoxide, HCl, and \(AlCl_3\)/CuCl is benzaldehyde.

(e) The major product formed when benzene reacts with nitric acid and sulfuric acid is nitrobenzene.

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A pH meter will make short work of identifying the pH of your solution. These meters have a glass probe that measures a solution's ion concentration. To use a pH meter, place a small portion of your solution in a beaker or test tube, rinse the probe of the pH meter, and then place the probe into your solution.

Source:

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pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7. pH meter is the only instrument to measure the pH of an unknown solution.

pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.

On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution.

pH meter is used to measure the pH of an unknown solution. A glass probe is attached to pH meters, that measure the concentration of hydrogen ion in unknown solution. Take the unknown solution in the beaker and then put the washed, clean glass probe in the solution. Now wait for a second to take the reading.

Therefore, pH meter is the only instrument to measure the pH of the solution.

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The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

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Chemicals that help reduce a change in pH when acids are added to a solution are called buffers. Buffers are substances that are capable of resisting changes in pH by accepting or donating protons (H+ ions) in order to maintain a relatively stable pH.

Buffers typically consist of a weak acid and its conjugate base (or a weak base and its conjugate acid). When an acid is added to a buffered solution, the weak base component of the buffer can accept the additional H+ ions, minimizing the increase in pH. Conversely, when a base is added, the weak acid component of the buffer can donate H+ ions, minimizing the decrease in pH. Common examples of buffer systems include acetic acid/acetate buffer (found in vinegar), phosphate buffer (used in biological systems), and bicarbonate buffer (important in maintaining blood pH).In summary, buffers help reduce the change in pH when acids are added to a solution by accepting or donating protons to maintain the pH within a relatively narrow range.

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I would agree with Student 2 in this debate.

While it is true that graphite (C) does not contain oxygen and therefore does not fit the traditional definition of a carbonate, the presence of carbon in its chemical formula does not automatically categorize it as a carbonate. The classification of minerals is determined by their chemical composition and crystal structure, among other factors.

Graphite is actually a form of pure carbon arranged in a specific crystal lattice structure, distinct from carbonates which typically contain carbon, oxygen, and other elements like calcium or magnesium. Hence, the presence of carbon alone does not make a mineral a carbonate, and Student 2's argument is more accurate in this context.

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The specific heat capacity of the alloy that requires 49.1 kj to raise the temperature of 180.7 g alloy from 217 k to 489 k is approximately 0.815 J/g°C.

Using the formula below, we can calculate the alloy's specific heat capacity (c) in joules per gram per degree Celsius (J/g°C):

q = mcΔT

Where q is the heat energy, m is the mass of the alloy, c is the specific heat capacity of the alloy, and T is the temperature change in degrees Celsius.

provided values

Given that 1 kJ = 1,000 J, q = 49.1 kJ = 49,100 J.

m = 180.7 g

ΔT = 489 K - 217 K = 272 K

We can find c by rearranging the formula:

c = q / (m * ΔT)

replacing the specified values:

c = 49,100 J / (180.7 g * 272 K)

c ≈ 0.815 J/g°C

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Answer:  the MAIN GROUP number equals the NUMBER of VALENCE electrons

Propane produces more energy as compared to ethanol during burning.

Energy produce by ethanol is 10.45 kilojoules per gram whereas  propane release 46 kilojoules per gram of energy when burn so by comparing these two chemicals we can conclude that propane produces more energy as compared to ethanol during burning.

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Answer:

B. reflection

Explanation:

Rigid transformations are methods involved in changing the dimensions or orientation of a given figure. The methods are; dilation, rotation, translation and reflection.

Reflection is the process in which a given figure is turned or flipped with respect to a point or line of reference.

In the given question,

ΔDEF ≅ ΔD'EF' (Side-Side-Side congruence property)

This implies that ΔDEF was reflected about point E to produce ΔD'EF'. Thus the required rigid transformation is reflection.

Answer:

Is C - Rotation

Explanation:

I have right on my test