Compare the type of change that occurs when a substance melts and when a substance is set on fire. Use complete sentences to justify the type of change that occurs.

Notice that nitrogen is less abundant than either carbon or oxygen. this is an example of the more general observation that the abundances of these three elements follow a general pattern in which even-numbered elements are more common than the odd-numbered elements.

Natural abundance  refers to the abundance of isotopes of a chemical element that are naturally found on a planet. The relative atomic mass a weighted average, weighted by mole-fraction abundance figures of these isotopes is the atomic weight listed for the element in the periodic table.

Elements with even atomic numbers are more abundant than the elements with odd atomic numbers that come between them. Carbon is atomic number 6, nitrogen is atomic number 7, and oxygen is atomic number 8. The abundances of these three elements follow a general pattern in which even-numbered elements are more common than the odd-numbered elements that come between them.

To know more about abundant

https://brainly.com/question/346436

#SPJ4

3.125g

Explanation

2.4 minutes = 1 half life

so 12 minutes = 5 half lives (12/2.4)

100g/2 = 50g (1 half life)

50g/2 = 25g (2 half lives)

25g/2 = 12.5g (3 half lives)

12.5g/2 = 6.25g (4 half lives)

6.25g/2 = 3.125g (5 half lives)

The two factors that explain the difference in solubilities of ionic solids in water are:

Lattice Energy: This is the energy required to separate the ions in an ionic solid. Ionic compounds with higher lattice energies require more energy to break their ionic bonds and dissolve in water. As a result, they tend to be less soluble in water. On the other hand, ionic compounds with lower lattice energies require less energy to dissolve in water and tend to be more soluble in water.

Hydration Energy: This is the energy released when ions are hydrated (surrounded by water molecules). When an ionic solid dissolves in water, the water molecules surround and stabilize the separated ions.

Answer:  A. solid, compound

Explanation:

Because copper sulphate is a compound and it is a blue solid powder

Hope that help :)

The maximum mass of MgO produced is 1.64 g.

The given equation is not balanced. Assuming the correct equation is:

Mg + H₂O → MgO + H₂

The balanced equation shows that 1 mole of Mg reacts with 1 mole of H₂O to produce 1 mole of MgO and 1 mole of H₂.

The molar mass of Mg is 24.31 g/mol, which means that 1.00 g of Mg is equal to 1.00 g / 24.31 g/mol = 0.0411 mol Mg.

According to the balanced equation, 1 mol of Mg produces 1 mol of MgO. Therefore, 0.0411 mol of Mg produces 0.0411 mol of MgO.

The molar mass of magnesium oxide is 40.31 g/mol, which means that 0.0411 mol of MgO is equal to 0.0411 mol × 40.31 g/mol

= 1.64 g of MgO.

To know more about magnesium oxide here

https://brainly.com/question/1533548

#SPJ4

All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.

Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.

Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.

learn more about ionic compounds here

https://brainly.com/question/30420333

#SPJ11

Answer:

Explanation:

A is the correct answer.

If you found my answer useful then please mark me brainliest

Answer:

I put this so the guy up top can have brainliest

Explanation:

your welcome

Considering the Gay-Lussac's law, if the absolute pressure of a gas is increased from 3 atm to 4 atm at constant volume, then the absolute temperature of the gas will increase by \(\frac{4}{3}\).

Gay-Lussac's law states that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of shocks against the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature.

In summary, when there is a constant volume, with increasing temperature, the pressure of the gas increases. And when the temperature is decreased, gas pressure decreases.

Gay-Lussac's law can be expressed mathematically as follows:

\(\frac{P}{T} =k\)

Studying an initial state 1 and a final state 2, it is fulfilled:

\(\frac{P1}{T1} =\frac{P2}{T2}\)

In this case, you know:

Replacing in Gay-Lussac's law:

\(\frac{3 atm}{T1} =\frac{4 atm}{T2}\)

Solving:

\(T2\frac{3 atm}{T1} =4 atm\)

\(T2=\frac{4 atm}{\frac{3 atm}{T1} }\)

\(T2=\frac{4 atm}{3 atm }T1\)

\(T2=\frac{4 }{3 }T1\)

Finally, if the absolute pressure of a gas is increased from 3 atm to 4 atm at constant volume, then the absolute temperature of the gas will increase by \(\frac{4}{3}\).

Learn more about Gay-Lussac's law:

https://brainly.com/question/4147359

#SPJ4

Answer:

A.hydrogen

Explanation:

A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus

Answer:

Molybdenum is M, Einsteinium is E, and N is Nitrogen. Lastly, S is sulfur.

Answer:

Molecular

C6H8 has the empirical formulae as C3H4

Answer:

Topaz I do believe

Hope This Helps!

Answer:

If you were to plug your nose, it would block out more than 80% of taste, causing all three items to have no taste- therefore making them taste the same.

Explanation:

Answer:

Chemicals should involve information about properties and reactants.

The free energy change of a reaction (ΔG°) can often be approximated by the change in bonding energy, particularly for reactions not carried out at high temperatures, because bonding energy is a major factor that determines the stability of molecules.

The free energy change of a reaction (ΔG°) is the energy available to do work in a system. It can often be approximated by the change in bonding energy only, particularly for reactions not carried out at high temperature because at low temperatures, the changes in entropy (disorder) and vibrational energy are usually small. This means that the change in bonding energy dominates the free energy change. However, at high temperatures, the changes in entropy and vibrational energy become more significant and must also be considered when calculating the free energy change. Therefore, the approximation of the change in bonding energy only is only valid for reactions not carried out at high temperature.

Learn more about free energy change of a reaction here:

https://brainly.com/question/30808444

#SPJ11

Answer:

Anticline

Other than that Just A C:

Explanation:

Answer:

A

Explanation:

Answer: A-Nebulae can form stars, comets cannot

Explanation: Simply comets get destroyed and Nebulae are often star-forming regions, such as in the "Pillars of Creation" in the Eagle Nebula. In these regions, the formations of gas, dust, and other materials "clump" together to form denser regions, which attract further matter, and eventually will become dense enough to form stars.

While Nebulae is a body of interstellar cloud, made of cosmic dust, hydrogen etc , Comets are balls of rocks, frozen gases, that revolve the Sun.

Nebulae can form stars, but comets cannot. Option A is correct

Nebulae is a different body of interstellar cloud, they are made out of cosmic dust, hydrogen, helium, and molecular clouds.

While Comets are balls of rock, frozen gases, and other particles that revolve around the Sun.

Read more about Galaxy

https://brainly.com/question/2905713

bonded means that the two have come together and are attached together, wheras attracted means that the two like to come close to each other but are not put together

The reaction between AgNO₃ and NaCl forms AgCl and NaNO₃. The balanced chemical equation for the above reaction is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

The reaction between AgNO₃ and NaCl is both precipitation and double-displacement reaction. The balanced chemical equation is given as:

AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq)

                                          (ppt)

In a double displacement reaction the anions are exchanged and the more reactive element displaces the less reactive element. And in a precipitation reaction, a precipitate is formed in the end of the reaction. In this reaction, AgCl is formed as precipitate.

Learn more about precipitation and double-displacement reaction from the link given below.

https://brainly.com/question/29545748

#SPJ4

In order to determine if a chemical hazard truly exists, there are several pertinent pieces of chemical information that must be considered. Firstly, the chemical composition of the substance in question must be examined, including its molecular formula and structural properties.

This information can help to determine the potential toxicity and reactivity of the chemical, as well as its potential routes of exposure (e.g. inhalation, ingestion, skin contact).

Additionally, data on the physical properties of the chemical - such as its melting point, boiling point, and solubility - can be important in determining how the substance may behave in different environments and under different conditions.

Finally, information on the potential environmental impact of the chemical, such as its persistence in the environment or its potential to bioaccumulate, can also be crucial in assessing the overall hazard posed by the substance.

By considering all of these factors together, a comprehensive picture of the potential hazards associated with a particular chemical can be developed, helping to inform appropriate risk management strategies and protective measures.

To know more about chemical hazard, refer here:

https://brainly.com/question/13340017#

#SPJ11

Answer:

living organisms whose genetic material has been artificially manipulated in a laboratory through genetic engineering

Explanation:

Answer:

The adjustable legs and the table of sand.

Note:The question is incomplete. The complete question is given below.

Using Models to Answer Questions About Systems

Armando’s class was looking at images of rivers formed by flowing water. Most of the rivers were wide and shallow, but one river was narrow and deep. Armando’s class thinks that this river is narrow and deep because:

Armando designed the model below to try to answer the question: Why is this river so narrow and deep?

Explanation:

The model designed by Armando will be helpful to answer the question because of the following features it possesses:

1. An adjustable leg- since one of the hypotheses put forward by the class to explain why the river was narrow and deep was that the hill that the water flowed down was very steep, the adjustable legs can be lowered or raised in order to make the slope shallower or steeper so that their hypothesis can be tested.

2. A table of sand- the table of sand serves as the streambed. By adjusting the size of the sand grains to be larger or smaller, the students will be able to to test their second hypothesis that the small size sand grains that the water flowed through was the reason for the river to be narrow and deep.

The results of their experiments will enable them to come to a conclusion.

Answer:

Like other alkali metals, rubidium metal reacts violently with water. As with potassium (which is slightly less reactive) and caesium (which is slightly more reactive), this reaction is usually vigorous enough to ignite the hydrogen gas it produces.

Explanation:

hope it helps

e is the right answer. haha

In the distillation of a pure material, all of the pure material not vaporize once the boiling point is reached because more heat would need to be added to the distillate in order to vaporize the liquid from its boiling point.

During distillation, the process of vaporizing a liquid and collecting the resulting vapor as a purified substance, it is important to consider the energy requirements involved.

When a liquid reaches its boiling point, it undergoes a phase change from the liquid phase to the gas phase. This phase change requires the input of energy in the form of heat. The heat breaks the intermolecular forces holding the liquid molecules together, allowing them to transition into the gas phase.

The heat required to vaporize a liquid is not solely determined by the boiling point. The heat required to convert a liquid into a gas is known as the heat of vaporization, and it varies depending on the substance.

When distilling a liquid, such as water, the heat of vaporization must be supplied to convert the liquid into vapor. This energy is absorbed by the liquid, and it is essential to provide continuous heating to maintain the distillation process.

As the liquid is heated and reaches its boiling point, vaporization begins. However, the rate at which the liquid vaporizes depends on the amount of heat being supplied. If the heat input is insufficient, the vaporization process will be slower, and not all of the liquid will vaporize at once.

To ensure the complete vaporization of a liquid during distillation, a sufficient amount of heat must be continuously applied to the system. This allows the heat of vaporization to be continually supplied to the liquid, facilitating the conversion of the entire liquid into vapor.

If the heat input is insufficient, the vaporization process will be slower, and the liquid may not vaporize all at once. Providing adequate and continuous heating is crucial to ensure the complete conversion of the liquid into vapor during distillation.

To know more about distillation here

https://brainly.com/question/31829945

#SPJ4

Answer: Chlorine gas is produced when sulfuric acid is mixed with chlorine bleach.

Explanation:  This reaction is a function of the change in pH of the solution from alkaline to acidic combined with the strong oxidant properties of hypochlorous acid.

Answer:high pressure system and cold fronts

Explanation:

High pressure develops in areas where air cools and sinks. This usually causes fair weather with cool temperatures and few clouds.

Cold fronts occur when warm air is pushed up into the atmosphere by colder air at the ground. These fronts tend to move faster than the other types of fronts and are associated with the most violent types of weather such as severe and super cell thunderstorms, although any type of front can produce these same storms. After a cold front passes it is common to have clear skies and a dramatic change in wind direction on top of the cooler air associated with the front itself.

         When molecules of the constituent components are not entirely mixed, this is referred to as a heterogeneous mixture. You could observe patches of one substance scattered among patches of another substance with the unaided eye or even under a microscope. The mixtures typically manifest as various phases or states of matter.

       The environment on a wet day serves as an illustration of a heterogeneous blend. Air, a gas, and liquid raindrops combine to create the wet atmosphere. Through the less thick air, there are spots of dense liquid water dropping. Due to the presence of two states, or phases, of matter—liquid and gas—it is clearly a heterogeneous mixture.

        Importantly, visibility is lowered on a rainy day. Because sunlight can move through air without being blocked, we can see through it. However, liquid raindrops bend, disperse, and block sunlight, preventing it from passing through the cloudy atmosphere.

         On the planet Earth, heterogeneous mixes make up the great bulk of substances.

        Below are many instances of typical heterogeneous mixtures.

To Learn more About heterogeneous mixture, Refer:

https://brainly.com/question/14441492

#SPJ13

The change(s) that would double the amount of tin produced are I and II, ions increases the amount of tin that will be produced. Doubling the amount of time used for electrolysis also increases the amount of tin that is produced.

The following is the procedure used to produce metallic tin from Sn2+ electrolysis: At the anode, oxidation of Sn2+ ions takes place as Sn2+ → Sn4+ + 2e-.At the cathode, reduction of Sn2+ ions takes place as Sn2+ + 2e- → Sn.

The overall electrolysis reaction is Sn2+ → Sn + 2e-.Electrolysis can be carried out in molten SnCl2, which can be produced by heating Sn in the presence of an excess of Cl2 gas.

It is possible to electrolyze aqueous solutions of Sn2+ salts such as SnCl2, but the reaction is complicated by the presence of H+ and OH- ions. Electrolysis of aqueous solutions of Sn2+ salt requires the use of an ion-selective membrane, which prevents the migration of unwanted ions to the cathode and anode.

For more such questions on electrolysis, click on:

https://brainly.com/question/12994141

#SPJ11