What is the term for a ratio of equivalent measurements that can be used to change a value from one unit to another

Answer:

The answer would be C.

Explanation:

I took a test with the same question.

The activation energy is very high. Hence, option C is correct.

Activation energy is the sufficient amount of energy necessary to initiate a chemical reaction.

When sodium hydroxide (NaOH) dissolves in water, it is distributed into positively-charged sodium ions and negatively - charged hydroxide ions.

These cations and anions move around in the water, free and independent of each other, though cations tend to be surrounded more closely by anions and vice versa.

Hence, when sodium hydroxide and water will react at room temperature, the activation energy is very high.

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Answer:

a measuring cylinder containing water only.

Explanation:

If we want to measure the volume of an irregular object. We need a properly calibrated measuring cylinder filled with water of known volume.

The irregular object is now inserted into the measuring cylinder containing water and the change in the volume of water is noted. The volume of the irregular object is now obtained as;

New volume of water - initial volume of water.

Hence, only a measuring cylinder filled with water is required to measure the volume of a small irregularly- shaped stone.

Answer:

yes

Explanation:

yes natural gemstones are better than artificial gemstones natural gemstones is better Because people love it more and artificial gemstones are made and people like natural gemstones

Answer:

The answer to whether natural gemstones are better than artificial gemstones depends on various factors and individual preferences. Here are some points to consider:

Rarity and uniqueness: Natural gemstones are formed over millions of years in the Earth's crust, making them rare and unique. They often possess distinctive characteristics and imperfections that add to their allure. If you appreciate the natural beauty of a gemstone and the story behind its formation, a natural gemstone might be more appealing to you.

Value and investment: Natural gemstones, especially those of high quality and rarity, tend to hold their value well over time. They can be considered as investments, with the potential for appreciation. Artificial gemstones, on the other hand, generally do not have the same level of value or investment potential.

Environmental impact: Natural gemstone mining can have significant environmental consequences, including habitat destruction, soil erosion, and pollution. Artificial gemstones, often created in laboratories, can be considered more environmentally friendly as they reduce the need for extensive mining operations.

Consistency and quality control: Artificial gemstones are created under controlled conditions, allowing for greater consistency in terms of color, clarity, and overall quality. Natural gemstones, on the other hand, can vary widely in terms of these attributes. If you prefer a gemstone with a uniform appearance and specific characteristics, an artificial gemstone might be more suitable.

Cost: Artificial gemstones can be significantly less expensive than their natural counterparts. If budget is a consideration, artificial gemstones can offer a more affordable option while still providing a similar visual appeal.

Ultimately, the choice between natural and artificial gemstones depends on your personal preferences, budget, and the intended purpose of the gemstone. Both types have their unique qualities, and it's up to you to decide which factors are most important to you.

The new volume of the O2 gas would be approximately 355 ml if the temperature changed from 25 degrees Celsius to 35 degrees Celsius, assuming the pressure remains constant

Assuming the pressure remains constant, we can use the formula V1/T1 = V2/T2 to find the new volume. Converting 25 degrees Celsius to Kelvin (25 + 273 = 298K), we have:
V1 = 344 ml
T1 = 298K
If the temperature changed to 35 degrees Celsius (35 + 273 = 308K), we can solve for V2:
V1/T1 = V2/T2
344 ml / 298K = V2 / 308K
Solving for V2, we get:
V2 = (344 ml / 298K) * 308K = 355 ml (approximately)
Therefore, the new volume of the O2 gas would be approximately 355 ml if the temperature changed from 25 degrees Celsius to 35 degrees Celsius, assuming the pressure remains constant.
A sample of O2 gas occupies a volume of 344 mL at 25°C. If the pressure remains constant, we can apply Charles's Law to determine the new volume when the temperature changes. Charles's Law states that V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature. To use this formula, temperatures must be in Kelvin. 25°C is equivalent to 298 K. When the temperature changes to T2, substitute the known values into the equation:
(344 mL / 298 K) = (V2 / T2)
Solve for V2 by multiplying both sides by T2:
V2 = (344 mL / 298 K) × T2
To find the new volume, simply replace T2 with the desired final temperature (in Kelvin) and solve for V2.

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Answer:

sound waves, light waves, radio waves, microwaves and others

Explanation:

these waves have the same fundamental properties of reflection ,refraction, diffraction and interference, and all waves have a wavelength, frequency, speed and amplitude

Explanation:

colloid is a mixture in which one substance of microscopically dispersed insoluble particles are suspended throughout another substance. However, some definitions specify that the particles must be dispersed in a liquid,[1] and others extend the definition to include substances like aerosols and gels. The term colloidal suspension refers unambiguously to the overall mixture (although a narrower sense of the word suspension is distinguished from colloids by larger particle size). A colloid has a dispersed phase (the suspended particles) and a continuous phase (the medium of suspension). The dispersed phase particles have a diameter of approximately 1 nanometre to 1 micrometre.[

hope it helps.

Answer:

colloids are mixtures in which one or more substances are dispersed as relatively large solid particles or liquid droplets throughout a solid ,liquid or gaseous medium .The particles of a colloid remain and do not settle due to gravity ,and they are often electrically charged

Answer:

2.95 centiliters

Explanation:

The student created a solution of lithium chloride with a molarity of 1.00 M by dissolving 95.0 grams of LiCl in 2.24 L of water.

The molarity of the solution can be calculated using the formula:

Molarity (M) = moles of solute / volume of solution in liters

To find the moles of solute, we need to convert the given mass of LiCl into moles using its molar mass. The molar mass of LiCl is 42.39 g/mol.

95.0 g LiCl x (1 mol LiCl / 42.39 g LiCl) = 2.24 mol LiCl

Now, we can substitute the values into the molarity formula:

Molarity = 2.24 mol LiCl / 2.24 L = 1.00 M

Therefore, the answer is (a) 1.00 M. The student created a solution of lithium chloride with a molarity of 1.00 M by dissolving 95.0 grams of LiCl in 2.24 L of water.

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An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

An indicator dye called bromothymol blue (BMB) turns yellow in the presence of an acid. The pH of the solution is lowered when carbon dioxide is added because carbonic acid is formed as a result.

Bromothymol blue with concentrated hydrochloric acid is the magenta color on the left. Bromothymol blue can be used as a respiratory indicator or for monitoring photosynthetic processes (turns yellow as CO 2 is added). Exhaling via a tube into a neutral BTB solution is a typical way to demonstrate BTB's pH indicator abilities.

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Answer: the plasma membrane, the cytoplasm, ribosomes, and genetic material.

hope this helped

The pH of buffer solution (a) is 4.74, and the pH of buffer solution (b) is 4.74. Solution (a) is a more effective buffer because it has a higher concentration.

To calculate the pH of the buffer solutions, we will use the Henderson-Hasselbalch equation: pH = pKa + log([A-]/[HA]). CH₃COOH is a weak acid with a pKa of 4.74. In both solutions, the ratio of [A-] (CH₃COONa) to [HA] (CH₃COOH) is 1, as their concentrations are equal.

For both solutions:
pH = 4.74 + log(1) = 4.74 + 0 = 4.74

Although both solutions have the same pH, solution (a) is more effective as a buffer because it has higher concentrations (2.0 M) of both the acid (CH₃COOH) and its conjugate base (CH₃COONa), compared to solution (b) with 0.20 M concentrations.

Higher concentrations increase the buffer's ability to resist pH changes when small amounts of acids or bases are added.

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\(\mathfrak{\huge{\pink{\underline{\underline{AnSwEr:-}}}}}\)

Actually Welcome to the Concept of the Acceleration.

a = V2-V1/t

so the correct answer is, a = ∆v/t

option C.) is correct, a = ∆v/t

Answer:

m = y2-y1 / x2-x1

Explanation:

The question is incomplete, the complete question is:

Standardization of a Borax solution (Na2B4O7). A student titrates a 20.00 mL sample of an aqueous borax solution with 1.044 M H2SO4. It takes 2.63 mL of acid to reach the equivalence point. Knowing it takes 1 H2SO4 to neutralize 2 Na2B4O7, what was the concentration of this Borax solution?

Answer: The concentration of borax solution is 0.069 M.

Explanation:

To calculate the concentration of borax solution, the formula used is:

\(n_1C_1V_1=n_2C_2V_2\) ....(1)

where,

\(n_1, C_1\text{ and }V_1\) are the n-factor, concentration and volume of sulfuric acid

\(n_2,C_2\text{ and }V_2\) are the n-factor, concentration and volume of borax solution.

We are given:

\(n_1=1\\C_1=1.044M\\V_1=2.63mL\\n_2=2\\C_2=?M\\V_2=20mL\)

Putting values in equation 1, we get:

\(1\times 1.044\times 2.63=2\times C_2\times 20\\\\C_2=\frac{1\times 1.044\times 2.63}{2\times 20}\\\\C_2=0.069M\)

Hence, the concentration of borax solution is 0.069 M.

Answer:

B

Explanation:

The rate constant is equal to forward rate divided by reverse rate.

K = f/r

-> r = f/K

0.62/0.75 = 0.8267

Answer:

its B

Explanation:

I TOOK THE TEST

Answer:

112.6g KCl

Explanation:

With the mass of AgCl that we obtain after the precipitation we can obtain its moles = Moles Cl. As all Cl comes from KCl, moles of Cl = Moles KCl + 2*Moles MgCl₂. We can write:

Moles AgCl = Moles Cl

329.0g * (1mol / 143.32g) =

2.2956 moles Cl = Moles KCl + 2 Moles MgCl₂ (1)

150.0g = MolesKCl * 74.5513g/mol + Moles MgCl₂*95.211g/mol (2)

Replacing (2) in (1):

2.2956 moles Cl = 150/74.5513 - 95.211/74.5513 Moles MgCl₂ + 2 Moles MgCl₂

2.2956 = 2.012 - 1.2771Moles MgCl₂ + 2moles MgCl₂

0.2836 = 0.7229 moles MgCl₂

0.392= moles MgCl₂

Mass MgCl₂:

0.392 * (95.211g/mol) = 37.4g MgCl₂

Mass KCl:

KCl = 150.0g - 37.4g =

Answer:

This can be true. Since plays rely on dialogue and stage directions, It creates a lot of opportunities to have memorable dialogue, and "well-thought-out" stage directions. But, nevertheless, short stories and novels, can also have memorable dialogue, though they are most often narrative. So, yes, it is important for plays to have important dialogue and stage directions.

Explanation:

I hope this helps! Great to be of service to you!

Answer:

9.9966788 x 10^-1

Answer:

Rise surface fall surface rise

Explanation:

Hope this helps!

Answer:

H₃P phosphidic acid

Explanation:

The Trihydrogen monophosphide, as stated in the exercise, can act as an acid. This is pretty similar to the case of hydrogen chloride, which is a gas but it can also be an acid, in this case, chloridic acid.

In the case of trihydrogen phosphide, we can write it molecular formula which is:

H₃P

Now, this is a binary compound because its composed of only two elements, in this case, hydrogen and phosphide. To name binary acid, we need to name the non metal with the sufije idic, and then, the word acid.

Following this simple rule, the trihydrogen phosphide would be, as acid:

H₃P: phosphidic acid

Hope this helps

Answer: D

Explanation:

D - Decomposition of carbonates into oxide and carbon dioxide

A - Combustion reaction. Combustion of methane to form Carbon dioxide and water.

C - Reaction of reactive metal (Na) and water to form hydroxide.

B - No particular name of the reaction. Usually denoted as a synthesis redox reaction.

Answer:CaCO3  CaO + CO2

Explanation: just took it

The reaction of a haloalkane (X) with sodium metal in the presence of dry ether that produces 2,3-dimethylbutane as the major product suggests that (X) is 2-bromopropane.

The reaction can be represented as follows:

2-bromopropane + 2Na → 2,3-dimethylbutane + 2NaBr

In this reaction, the sodium metal (Na) acts as a strong reducing agent and undergoes a single-electron transfer with the bromine atom in 2-bromopropane (X), resulting in the formation of 2,3-dimethylbutane and sodium bromide (NaBr) as the byproduct.

Hence, the reaction of a haloalkane (X) with sodium metal in the presence of dry ether that produces 2,3-dimethylbutane as the major product suggests that (X) is 2-bromopropane.

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215 grams of AlCl₃ is equal to 1,61 moles of AlCl₃. The relative molecular mass of the compound AlCl₃ is 133.5 grams/mol.

The mole is one of the basic units used to indicate the amount of substance in the international system of units. The equation for calculating moles is mol = mass / relative atomic mass. To find out the mol of AlCl₃ you can use the following steps

Step 1: Calculate the relative molecular mass for the compound AlCl₃.

Mr AlCl₃ = ( Ar Al × ∑Al ) + ( Ar Cl × ∑Cl)

              = ( 27 gam/mol × 1) + ( 35,5 gram/mol × 3)

              = 27 gram/mol + 106,5 gram/mol

             = 133,5 grams/mol

Step 2: Calculate the moles of the compound AlCl₃.

n AlCl₃ = mass AlCl₃ ÷ relative molecular mass AlCl₃

            = 215 grams ÷ 133,5 grams/mol

            = 1,61 mol

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Answer:

A the first 1

Explanation:

Answer:

I classify the following examples as Endothermic

Neurons mostly receive signals that are excitatory ; others, however, are  inhibitory.

A neuron will generate action potentials more often when it receives more excitatory than inhibitory inputs.A neuron receives both excitatory and inhibitory inputs from the many other neurons it is connected to at synaptic junctions.

                   For an action potential to be generated in a neuron, the sum of the excitatory inputs must be greater than that of the inhibitory inputs.

Neurotransmitters are the chemical messengers in the body, which are released by the axon terminal of neuron ( also called nerve cell) and transmit nerve impulse to the neighboring cell ( which could be a muscle cell or a nerve cell) .

There are primarily two types of neurotransmitters that are-

1) Excitatory neurotransmitter and 2) Inhibitory neurotransmitter.

Inhibitory neurotransmitter have inhibitory effects on the neuron that is they reduce the chances that a neuron will fire an action potential. In other words, they are responsible for slowing signals between neurons.

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When an electron transitions from a higher energy level to a lower energy level in an atom, energy is emitted. Conversely, when an electron transitions from a lower energy level to a higher energy level, energy is absorbed.

In the case of hydrogen, the transition from n=2 to n=6 corresponds to the electron moving from a higher energy level to a lower energy level. Therefore, energy is emitted during this transition.

The transition from an orbit with a radius of 4.76 Å to an orbit with a radius of 0.529 Å corresponds to the electron moving from a higher energy level to a lower energy level as well. Hence, energy is emitted during this transition.

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Answer:

2.8g/cm³

Explanation:

Given parameters:

Mass of cube = 42g

Volume of cube  = 15cm³

Unknown:

Density of the cube  = ?

Solution:

Density is defined as the mass per unit volume of a substance. It is mathematically expressed as:

 Density  = \(\frac{mass}{volume}\)  

So;

 Density  = \(\frac{42}{15}\)   = 2.8g/cm³