I NEED THE AWNSER RIGHT NOWWWWW Four students categorized several environmental changes as short-term or long-term changes. Which chart correctly categorizes short- and long-term changes?

Answer:

Stirring

Explanation:

Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.

Answer:

crushing particles of solute

Explanation:

Answer: Classifies cultural features, such as populated areas, main roads, and boundaries, on older maps.

The lewis structure of Magnesium nitride places eight electrons around N. 3 of these electrons are provided by Mg to get a stable conformation.

The Lewis structure is a representation of electron pairs in bonds between the atoms that compose the molecule. It can also show the solitary electron pairs that remain for each atom.

Electrons

When adding the valence electrons of each atom, we get the total number of electrons in the molecule.

The valence value is the number of electrons placed in the last energetic level of the atom.

The compound that forms between magnesium and nitrogen is magnesium nitride, Mg₃N₂. This is a simple salt with an ionic bond between a metal and a non-metal element.

They are elements that express a tendency to lose valence electrons to get a stable electronic configuration. When they lose electrons, they remain positively charged. These are cations with positive charges and lose the valence electrons of their last level.

Mg has 2 electrons in its last level, so to get a complete stable configuration (2e-), it needs to lose 2 electrons.

Mg has two positive charges Mg ²⁺

They are elements that gain electrons to complete their last level. These are the anions. When they get electrons, they remain negatively charged.

Because Nitrogen has 5 electrons in its last level, it needs to add 3 electrons. In this way, it gets to the complete stable configuration (8e-).

N has three negative charges N³⁻

So, to complete the Lewis structure, we need to add Mg ²⁺ and N³⁻.

We know that

According to this, N needs more than one Mg to complete its last level.

So, in our calculations, we need to have three Mg and two N.

You will find the final Lewis structure in the attached files.

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Answer:

coefficient green : 2.4865

exponent (yellow) : 16

Explanation:

Answer:

A salt metathesis reaction, sometimes called a double displacement reaction, is a chemical process involving the exchange of bonds between two reacting chemical species which results in the creation of products with similar or identical bonding affiliations.

Explanation:

From: Wikipedia

Taking into account the definition of molarity, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

[tex]molarity=\frac{number of moles}{volume}[/tex]

Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].

In this case, you have:

Replacing in the definition of molarity:

[tex]molarity=\frac{0.2 mole}{0.1 L}[/tex]

Solving:

molarity= 2 [tex]\frac{moles}{liter}[/tex]

Finally, the molarity of a solution prepared by dissolving 0.2 mol sucrose in enough water to make a 100 mL solution is 2 [tex]\frac{moles}{liter}[/tex].

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Answer:

Decomposition reaction

Explanation:

When a single reactant is decomposed into two or more products that reaction is called decomposition reaction.

Option B is correct

Answer:

Number of mentos

Explanation:

i took the quiz

Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.

Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

The freezing-point depression for a solution is 2. 5 °C. We can calculate the molality of the solution using the following expression.

ΔT = Kf × b

b = ΔT / Kf = 2.5 °C / (4.5 °C/m) = 0.56 m

where,

Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.

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The molality of a solution will be 0.56 m. if the freezing point depression for a solution is 2.5° C.

Molality is the measure of the moles of any solute in a solution per unit kg of the solvent.

Given, the freezing-point depression for a solution is 2. 5 °C

The kf is 4.5° c/m

[tex]\rm \Delta T = Kf \times b\\\\b = \dfrac{\Delta T}{kf} \\\\b = \dfrac{2.5^ \circ C}{4.5 \circ C/m} = 0.56 m[/tex]

Where T is freezing point depression

kf is cryoscopic constant of the solvent

b is molality of the solution

Thus, the molality of the solution is 0.56 m.

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D. explosion

When a cracker is lit, a rapid response results in the development of large amount of energy of heat, light, and sound. Explosion is the term for such a reaction.

Answer:

D. Explosion

Explanation:

Here, we want to identify the type of combustion characterized by the given properties

From what we have, there is a sudden reaction that takes place as the cracker is ignited

The type of combustion here is called Explosion

It takes place suddenly with the evolution of light, heat, and sound upon ignition.

Hope this helps!

If you have any queries please ask.

During the course of a catalytic reaction Substrate is covalently bound and oriented with proximity to the active site residues.

The type of chemical species which can facilitate these reactions is transition metal cations.

These are proteins that act as biological catalysts and accelerate chemical reactions.

They function by binding to the substrate and requires the use of transition metal cations which acts as cofactors.

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Answer:

100

Explanation:

Will autoionzation of water be spontaneous at high temperature

Answer:

What are three ways continents get bigger?

age of rocks.

fossils.

evidence of melting (subduction)

location on current continents.

glacial deposits.

Answer: polar molocule

Explanation:

Answer:

true

Explanation:

it changes the chemicals in the water and adds new ones

Answer:

Hydrogen and oxygen

Explanation:

This is the most common compound water

The reaction is given by

Answer:

Hydrogen and helium is the answer

Both trials of 1.2 g and 1.6 g will have the same mass percent of water because the ratio of the salt to the water of hydration is always constant for any hydrated salt.

For every hydrated salt, the ratio of the salt to the water of hydration remains constant irrespective of the amount of salt taken for experimental analysis.

For example, assuming the mass percent of water in 10g of a hydrated salt is 40%, if 100g of the same salt is taken, the mass percent will remain 40%.

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A. I not sure kinda. Hopefully it's correct

Answer:

I think it is D.

Explanation:

Sry if I am wrong...

Answer:

wrinkle free

Explanation:

A radioactive element has a half-life of six days then the approximate decay rate of the element after the first day is 8.3%.

Half life time is that time during which half of the concentration of reactant will changed into the product.

According to the question:

In 6 days = 50% of the reactant will change into product

In 1 day = 50%/6 of the reactant will change into product

So, in 1 day = 8.3% of the reactant will change into product

Hence option (3) is correct.

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Answer:

density answer IS ....

Answer:

Option 2 is correct.

Answer: The color that will appear when the nichrome wire is properly cleaned and introduced into flame would be orange

Answer:

Thermal Energy

Explanation:

Energy that is dissipated or absorbed as heat is in the form of thermal energy.

When an atom gains or donates electrons to form an ion is called ionization. Hydrochloric acid with water and carbon dioxide with water are the ionization reaction.

In ionization reactions, the chemical species undergo changes to gain or lose electrons to acquire charge.

The reaction between hydrochloric acid and water to yield hydronium ion and chloride ion, and the reaction between carbon dioxide and water to yield hydronium ion and bicarbonate ion is the example of ionization as electrons are donated and gained by the species.

Therefore, the ionization reaction results in the gain or loss of electrons.

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Answer:

B and D just did it

Explanation:

Explanation:

Answer:

here:)

Explanation:

Natural Sciences is the core of the branches of science as studies the nature of our physical world and the universe. The three branches of Natural Sciences are:

Physics, the Study of Universe.

Chemistry, the Study of Matter.

Biology, the Study of Life and Living Organisms.

The color of the system will change between pink and blue depending on the concentration of species.

Equilibrium is attained in a reaction when the rate of forward reaction is equal to the rate of reverse reaction. Now consider the equilibrium;

Co(H2O)6^2+(aq) + 4Cl^-(aq) ⇄ CoCl4^2-(aq) + 6H2O(l)

We know that Co(H2O)6^2+(aq) is pink while  CoCl4^2-(aq)  is blue hence, if the concentration of the species are changed, the color of the system will change accordingly.

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Answer:

B, as height increases gravitational energy increases