Explain what happens to the particles in a substance during a physical change.

ANSWER

Option C

EXPLANATION

Given that;

In the reaction above, we have the following data

At the reactants side;

3 atoms of manganese

4 atoms of nitrogen

1 atom of sodium

1 atom of fluorine

At the products side

1 atom of manganese

4 atoms of fluorine

3 atoms of sodium

1 atom of nitrogen

To balance the above equation, apply the law of conservation mass

Law of conservation of mass states that matter can neither be created nor destroyed but can e transformed from one formato another.

To balance the equation, 1 mole of Mn3N4 reacts with 12 moles of Na Tto give 3 moles of MnF4 and 4 moles of Na3N

So, the new equation becomes

The following data can be deduced in the above equation

At the reactants side

3 atoms of Mn

4 atoms of N

12 atoms of Na

12 atoms of F

At the products side

3 atoms of Mn

12 atoms of F

12 atoms of Na

4 atoms of N

Looking atthe vabove data, the number of atoms of each element at the reactants side is equal to the number of atoms of same elements at the products side.

Hence, the correct answer is option Ce

u

Answer:

new moon

when the moon is front of the sun its a new moon

Arena might be investigating a separation technique known as evaporation, but she is missing a burner to perform it properly.

i) Evaporation is a separation technique that can be used to separate a substance dissolved in a liquid. It is usually applicable when the solvent doesn't have a too high boiling point and the solute is not prone to degradation at increased temperature.
ii) However, as the method requires heating the solution in order to accelerate the evaporation of the solvent, and while the tripod stand and wire gauze are used to mount the beaker with the solvent, they are useless without a burner that is used to introduce heat.

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In a vacuum, water boils at a lower temperature because the vapor pressure is lower. As a result, the boiling point of a substance is directly related to the pressure exerted on it. Therefore, pressure has an effect on boiling point.

The pressure has an effect on boiling point because pressure affects the boiling point of a substance.Boiling point is the temperature at which a liquid boils and turns into a gas. It is dependent on the pressure of the surrounding environment. A substance will boil when its vapor pressure equals the external pressure. When the external pressure is lower than the vapor pressure of the substance, it will boil at a lower temperature than usual. When the external pressure is higher than the vapor pressure of the substance, it will boil at a higher temperature than usual. In a vacuum, water boils at a lower temperature because the vapor pressure is lower. As a result, the boiling point of a substance is directly related to the pressure exerted on it. Therefore, pressure has an effect on boiling point.

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Explanation:

the law of conservation of mass

Answer:

Explanation:

the law of conservation of mass

0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

Thus, The name "glucose" is derived from the Greek word for "sweet." Your body uses this particular sort of sugar, which it obtains from the food you consume, as fuel.

It is referred to as blood glucose or blood sugar when it passes through your bloodstream to reach your cells. The hormone insulin transports glucose from the blood into the cells for use as fuel and storage. Blood glucose levels are higher in diabetics than in healthy people.

Either their cells don't react to insulin as insulin should or they don't have enough insulin to get it through. Long-term high blood glucose levels can harm your kidneys, eyes, and other organs.

Thus, 0.67 moles of glucose are dissolved in 250 mL of a 2.67 M solution.

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Answer:

D. 3Mg + N2

Explanation:

magnesium nitride will decompose to form elemental magnesium and nitrogen gas

Mg₃N₂  → Mg + N₂

The reaction now needs to be balanced So that the number of Mg and N atoms in the reactants is equal to that of the products

If a wave has a frequency of 7.20 x 10^14 Hz and travels at the speed of light (speed of light = 3.0 x 10^8 m/s), the wavelength is 0.42 × 10⁻⁶ m.

The term wavelength of light is defined as the distance between the two successive crests or troughs of the light wave. Wavelength is denoted by the Greek letter lambda (λ).

Given:

frequency  = 7.20 x 10^14 Hz

speed of light = 3.0 x 10^8 m/s

Wavelength = ?

Wavelength = speed of light/ frequency

λ = ν / f

= 3.0 x 10^8 / 7.20 x 10^14

= 0.42 × 10⁻⁶ m

Thus, if a wave has a frequency of 7.20 x 10^14 Hz and travels at the speed of light (speed of light = 3.0 x 10^8 m/s), the wavelength is 0.42 × 10⁻⁶ m.

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Answer:

The answer is 'C. In every body cell'

Explanation:

I hope this was helpful, have a blessed day.

In a chemical equation, the electrolytes in an aqueous solution are represented as dissociated ions if the equation is said to be an ionic equation. The net ionic equation ofPb2+ (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + Pb(OH)2(s).

Determining the net ionic equation:

The net ionic equation for the reaction between Pb(NO3)2 (aq) and NH3 (aq) to form NH4NO3 (aq) and Pb(OH)2(s) can be found by following these steps:

1. Write the balanced molecular equation:
Pb(NO3)2 (aq) + 2NH3 (aq) + 2H2O (l) --> NH4NO3 (aq) + Pb(OH)2(s)

2. Break all soluble compounds (aqueous solutions) into their ions:
Pb2+ (aq) + 2NO3- (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + NO3- (aq) + Pb(OH)2(s)

3. Identify and remove spectator ions (ions that appear on both sides of the equation):
In this case, the NO3- ion is a spectator ion.

4. Write the net ionic equation with the remaining ions and compounds:
Pb2+ (aq) + 2NH3 (aq) + 2H2O (l) --> NH4+ (aq) + Pb(OH)2(s)

This is the net ionic equation for the reaction between Pb(NO3)2 and NH3 to form NH4NO3 and Pb(OH)2.

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Thermohaline circulation that occur in the ocean part that flows across sea surface help to supply heat to polar regions.

The thermohaline circulation refer to a section and region of the ocean circulation which is majorly driven by heat gradient and freshwater that flows across the sea surface and also from the mixture of heat and salt that occur at the inside part of the ocean.

Therefore, Thermohaline circulation help to supply heat to polar regions.

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They include the folowing;

1. The break-up of firm particles = Endothermic heat absorbing process

2. The break-up of solute fragments = Endothermic heat arresting process

3. The joining of solute and solvent particles = Exothermic heat bearing process

The Enthalpy of Resolution maybe found in this manner including three elements: ΔHsoln = ΔH1 + ΔH2+ ΔH3

1. Break-up of the solute molecules from each one (extending the solute), this is an endothermic response. (ΔH1)

2. Break-up of the financially sound molecules from each one (extending the solid fragments), this is also an endothermic backlash (ΔH2)

In their divided states, the solute and fit fragments are free to attract each one liquid.

3. The exothermic response of the solute and fit resulting in the composition of the resolution. (ΔH3)

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Ammonia is the only byproduct of the reaction between nitrogen and hydrogen.

Ammonia, which has the chemical formula NH3, is an inorganic compound of nitrogen and hydrogen. An odorless gas with a potent scent, ammonia. The most elementary pnictogen hydride, it is a stable binary hydride. As a predecessor to 45 percent of the world's food and fertilizers, it significantly contributes to the nutritional needs of terrestrial animals, making it a common nitrogenous waste physiologically, especially among aquatic organisms. Approximately 70% of the ammonia produced is used in fertilizers of various sizes, compositions, and forms, including urea and dialkyl phosphate. Additionally, the earth is sprinkled with pure ammonia.

Ammonia is a building block for the production of various medicinal medications and is also a component, either directly or indirectly, of many commercial cleaning products.

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Answer:

A) Ammonia

Explanation:

\(2032533 \sq22222rt[2]{?} \)

Answer:

immune system is responsible for the protection of the body from germs ( micro organisms causing diseases), hence diseases also( that ,is the abnormal state of the body caused by the microbes).

Answer:

This is considered a hypothesis because it hasn't been confirmed. It is just a guess.

Explanation:

A hypothesis is a limited explanation of a phenomenon; a scientific theory is an in-depth explanation of the observed phenomenon. Law is a statement about an observed phenomenon or a unifying concept, according to Kennesaw State University. However, Newton's law doesn't explain what gravity is, or how it works.

Answer:

c

Explanation:

A. It is a statement of fact about how nature works instead of an explanation.

B. It provides an explanation for many observations and accepted hypotheses.

C. It describes how to test a possible explanation of one specific relationship.

D. It has not changed over time even though new technology has been developed.

If there are 4.0 moles of phosphorous acid, H₃PO₃ formed during a reaction. The mass of P₂O₃ required is 220 grams.

To find the mass of P₂O₃, there is need  to use the balanced equation and the molar ratio between P₂O₃ and H₃PO₃.

The balanced chemical equation is:

P₂O₃ + 3H₂O → 2H₃PO₃

From the equation, it is observed that 1 mole of P₂O₃ reacts with 2 moles of H₃PO₃. Thus, the molar ratio is 1:2.

According to quetsion there are 4.0 moles of H₃PO₃, use this molar ratio to find the moles of P₂O₃ required.

Moles of P₂O₃ = (4.0 moles H₃PO₃) / (2 moles H₃PO₃/1 mole P₂O₃)

= 2.0 moles P₂O₃

Next, calculate the mass of P₂O₃ needs to use its molar mass.

Mass of P₂O₃ = (2.0 moles P₂O₃) × (110 g/mol P₂O₃) = 220 g

Thus, the mass of P₂O₃ required is 220 grams.

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The single-replacement reaction between zinc (Zn) and copper sulfate (CuSO4) can be represented as follows:

Zn(s) + CuSO4(aq) → ZnSO4(aq) + Cu(s)  

Option(C).

In this reaction, zinc (Zn) displaces copper (Cu) from copper sulfate (CuSO4) to form zinc sulfate (ZnSO4) and copper (Cu) as products. Therefore, the correct answer is option C: Cu and ZnSO4.

A single-replacement reaction is a chemical reaction where an element replaces another element in a compound. It involves the transfer of ions, resulting in the formation of a new compound and the release of a displaced element.

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Diels-Alder response is a response of diene and dienophile , when dienophile contains a pi bond adjoining to the pi bond reacting with diene a method called secondary orbital overlap which leads to selectivity of the response.

In endo arrangement the adjacent pi bond creates opportunity for extra frontier orbital interaction. This more interplay stabilizes the transition state.

When the reactants are arranged in an exo configuration no such interaction is feasible that is why endo product is more solid than exo product.

The transition state in chemical reactions is a fleeting and high-energy intermediate state that marks the point of maximum progression towards the products. It represents the point of highest potential energy during a reaction, when the bonds between the reactant molecules are breaking and new bonds between the product molecules are forming.

The transition state is crucial to understanding the rate and mechanism of a reaction. It is characterized by a unique arrangement of atoms and bonding, and its stability determines the energy required for the reaction to proceed. Understanding the transition state is essential for controlling the rate and outcome of chemical reactions, and can be used in the development of catalysts to improve reaction efficiency and specificity. In summary, the transition state is a fleeting and high-energy stage in a chemical reaction, where the bonds between reactants break and new bonds between products form.

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Complete Question: -

Because the exo form is more stable than the endo form, why is the endo product formed almost exclusively at low temperatures (or with short reaction times at high temperatures)

The reaction is the preparation of cis-norbornene-5,6-endo-dicarboxylic anhydride from cyclopentadiene, maleic acid, ethyl acetate, and ligroin. In addition to the main product

In addition to the main products, what is an important side reaction that could occur in this experiment? Why is it not a problem for our reaction method?

it can be be be be be ebe be e e

The measurement to the correct number of significant figures is 6.25cm.

The term significant figures refers to the number of figures in a value that could be assigned a place value. Given the fact that a measurement must have the correct number of significant figures in order to have meaning, we need to obtain the correct number of significant figures of the measurement.

Thus, we know that a measurement of length is correct to the nearest 0.01 cm and looking at the measurement on the ruler as shown, we can say that the measurement to the correct number of significant figures is 6.25cm.

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Answer:

False

Explanation:

Mixtures are a solute and solvent that are not chemically combined, therefore easily separated. Solutions are a solute and solvent combined together.

Premium brands positioned at the high end of the market usually use the price-quality-based approach to positioning.

By essentially charging more for a commodity, the price-quality-based positioning strategy aims to give buyers the impression that the product is of higher quality than the competition.

Actually, it's a strategy that is highly effective in today's modern world as we often come across brands in all sectors whose pricing is way higher when compared to their fellow competitors. These brands create a placebo in the minds of the consumer that the product they offer is of the best possible quality that can exist in the market and due to which people purchase it.

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Answer:

Explanation:

The density of a substance can be found by using the formula

From the question

mass of copper = 75.6 g

volume = 8.5 cm³

Substitute the values into the above formula and solve

That's

We have the final answer as

Hope this helps you

Answer:8.96 g/cm³ (Near room temperature)

Explanation:

The advantages of using PBr₃ instead of the strong acid HBr for this transformation is the reaction occurs under mild conditions.The correct answer is A.

Alkyl halides can be produced from alcohols using phosphorus tribromide (PBr₃ ). The structure at carbon is inverted during the reaction with PBr₃ .

Since it prevents the potential of carbocation rearrangements, employing PBr₃ to transform alcohols into alkyl halides is much milder and more predictable than doing it with HBr or HCl.

You might think of the two steps that this reaction takes as "activation" and "substitution." By creating a bond with P (O-P bonds are highly strong) and displacing Br from P during the "activation" process (notice that this is effectively nucleophilic substitution at phosphorus), the alcohol is transformed into a suitable leaving group.

After being "activated," or changed into a suitable leaving group, oxygen can now participate in a substitution process at carbon.

By using a backside attack (SN2) to attack carbon, the bromide ion that was displaced from phosphorus breaks down carbon and forms C-Br, leaving behind a new alkyl bromide with an inverted structure and the Br₂P-OH leaving group.

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Answer:

mass cannot be created nor destroyed just moved around

Explanation:

The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed so it can only be moved around during a chemical reaction

If the rate constant for the zero-order reaction is 0.0170 M sat 300 c → products, it would take approximately 37.06 seconds for the concentration of A to decrease from 0.850 M to 0.220 M at 300 °C.

To find the time it takes for the concentration of A to decrease from 0.850 M to 0.220 M in a zero-order reaction, we will use the equation:

Rate = k × [A]^0

Since it is a zero-order reaction, the rate is constant and equal to k, the rate constant. Rearrange the equation to find the time:

t = (change in concentration) / k

The initial concentration of A is 0.850 M, and the final concentration is 0.220 M. So the change in concentration is:

Change in concentration = (0.850 - 0.220) M = 0.630 M

Now, use the given rate constant, k = 0.0170 M·s^(-1), to find the time:

t = (0.630 M) / (0.0170 M·s^(-1)) = 37.06 s

So, it would take approximately 37.06 seconds for the concentration of A to decrease from 0.850 M to 0.220 M at 300 °C.

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1. 0+15+30+45+60=150/5=30 s

0+10+16+22+27=75/5=15 cm^3

then, 15/30= 0.5 cm^3/s(average rate of rxn)

2. 0+15+30+45+60+75+90+105+120=540/9=60 s

0+10+16+22+27+31.50+36+39.5+42=224/9=24.89cm^3

then, 24.89/60=0.414cm^3/s (avrg rate of rxn)

3. overall rxn add all the time divide by 12 and the volume add them too and divide by 12. after take average volume divide by the average time to get the average rate of overall rxn

4. 16/30= 0.533cm^3/s

5. 39.5/105= 0.37cm^3/s

Answer:

the answer is O²- hopefully