Select the correct answer.
Consider an atom that has an electron in an excited state. The electron falls to a lower energy level. What effect does that have on the electron?
ОА
ОВ.
The electron releases energy in the form of light.
The electron absorbs energy in the form of light.
The electron retains its energy without any change.
Ос.
OD
The electron transfers its energy to other electrons.
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Answer:

The answer is D

Explanation:

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Answer:

5 grams

Explanation:

Answer:

b. hydrogen bonding.

Explanation:

Hope it helps.

Answer:

The subsrance that increases OH ion concentration.

Explanation:

Answer:

B) BaSO₄ and C) Mg₃(PO₄)₂

Explanation:

We can use the solubility rules to decide which substances are insoluble.

You have probably learned NAG SAG and "Cats Cradle Old People," Sally Said.

I've listed them below.

[tex]\begin{array}{lll}\textbf{Soluble} & \textbf{Insoluble}\\\textbf{N}\text{itrates} &\textbf{C} \text{arbonates }\\ \textbf{A}\text{cetates} & \textbf{C}\text{hromates}\\ \textbf{G}\text{roup 1} & \textbf{O}\text{ hydrOxides}\\ & \textbf{P} \text{hosphates}\\\textbf{S}\text{ulfates} &\textbf{S} \text{ulfites}\\ \textbf{A}\text{mmonium}& \textbf{S}\text{ulfides}\\\textbf{G}\text{roup 17} & \\\end{array}[/tex]

These aids help you remember that:

The salts of Group 1 metals are soluble (Li₂CO₃ and KOH).

Sulfates are usually soluble, except for BaSO₄. Thus, BaSO₄ is insoluble.

Phosphates are insoluble — Mg₃(PO₄)₂

The two insoluble compounds are BaSO₄ and Mg₃(PO₄)₂.

Answer:

option c the relative number of atoms of each element using the lowest ratio because empirical formula gives the simplest-whole number ration of each element

e.g. the empirical formula of benzeneC6H6 in CH

Explanation:

I HOPE IT WILL HELP YOU

Answer:

Since the equation is balanced, So it have same number of oxygen in the  reactants and well as product.

Oxygen in product = 8

Oxygen in reactant = 8

Answer:

Explanation:

i got prove thoooooo

Answer:

The answer is option D.

A weakly basic solution

Hope this helps.

Answer:

Explanation: Apex a weakly acidic solution

Answer: Three groups bound to it with no lone pairs

i think...

Answer:

The correct option is;

B. -112 kJ

Explanation:

The parameters given are;

N (g) + O₂ (g) → NO (g) ΔH = 90 kJ/mol

N (g) + O₂ (g) → NO₂ (g) ΔH = 34 kJ/mol

The required chemical reaction is given as follows;

2NO (g) + O₂ (g) → 2NO₂ (g)

Therefore, the heat of formation of 2 moles of NO = 2 × 90 = 180 kJ

The heat of formation of 2 moles of NO₂ = 2 × 34 = 68 kJ

Hence, given that the heat of formation of O₂ at room temperature = 0 kJ/mol, we have;

Change in enthalpy of the chemical reaction = Heat of formation of the products - Heat of formation of the reactants

Change in enthalpy of the chemical reaction = 68 kJ - 180 kJ = -112 kJ

Change in enthalpy of the chemical reaction = -112 kJ.

Answer:

-112

Explanation:

got it right on test

Answer:

18.76 g of copper II nitrate

Explanation:

Now recall that we must use the formula;

n= CV

Where;

n= number of moles of copper II nitrate solid

C= concentration of copper II nitrate solution

V= volume of copper II nitrate solution

Note that;

n= m/M

Where;

m= mass of solid copper II nitrate

M= molar mass of copper II nitrate

Thus;

m/M= CV

C= 0.05 M

V= 2.00 L

M= 187.56 g/mol

m= the unknown

Substituting values;

m/ 187.56 g/mol = 0.05 M × 2.00 L

m= 0.05 M × 2.00 L × 187.56 g/mol

m= 18.76 g of copper II nitrate

Therefore, 18.76 g of copper II nitrate is required to make 0.05 M solution of copper II nitrate in 2.00 L volume.

An elements's emission spectrum determines the electron energy levels and the correct option is option C.

An element's emission spectrum is determined by the specific energy levels of its electrons. When an electron in an atom transitions from a higher energy level to a lower energy level, it releases energy in the form of electromagnetic radiation.

The wavelength and frequency of this emitted light correspond to specific energy differences between the electron energy levels. Each element has a unique arrangement of electron energy levels, leading to a distinct emission spectrum.

By analyzing the emitted light, scientists can identify the element and gain insights into its atomic structure. The size of the sample, mass of the nucleus, and number of protons do not directly determine an element's emission spectrum.

Thus, the ideal selection is option C.

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Answer:

0.057 L

Explanation:

Data obtained from the question include:

Initial temperature (T1) = 25°C

Initial pressure (P1) = 1 atm

Initial volume (V1) = 10 L

Final temperature (T2) = 25°C

Final pressure = 175 atm

Final volume =.?

From the data obtained from the question, we can see that the temperature is constant. Therefore, we shall apply the Boyle's law equation to determine the new volume of air. This is illustrated below:

P1V1 = P2V2

1 x 10 = 175 x V2

Divide both side by 175

V2 = 10/175

V2 = 0.057 L

Therefore, the volume of air which can be stored when the tank is compressed is 0.057 L

Answer:

-1.76201864

Explanation:

0.00325136 - 1.76527 = 1.76201864

The concept of significant figures are mainly used by scientist and engineer to know the significance of digits in a measurement. Therefore, -1.76201 is the value on applying mathematical operation.

Significant figures are the figures that indicate the degree of accuracy of a value. It tells about the precision of a value. It gives an idea about the digits that are necessary to indicate the experimental value.

Rules for counting significant figures are:

Number between 1 to 9 is always significant

Zeroes after a number has got no significance

Zeroes before a number has got no significance

Zeroes between number has got significance

0.00325136 - 1.76527

= -1.76201

Therefore, -1.76201 is the value on applying mathematical operation.

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If we want to lift a 30 kg box to a height of 1 m Ans is 294 J

Explanation:

Ans is 249 J

Answer:

molar mass of carbon tetrafluoride (CF4) is

(12.01 × 1 ) + ( 4 × 19.00)

= 12.01 + 76

= 88.01u

= 88u

Hope this helps

Answer:

B is the correct option

Explanation:

K= the ratio of product of concentration of products to the product of concentration of reactants raised to power equal to their cofficients.

Answer:

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Explanation:aaaaaaa

Answer:  Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.

Explanation: Baking is a chemical change you cant turn it back to what it was before. Its chemical properties have changed. Melting is a physical change. Its chemical properties are still the same it has not changed. It just changed it's physical form but the object is still the object.

Answer:

Charlotte, because baking causes a chemical change, but melting objects is a non-chemical change.

Explanation:

took the quiz on edge

Answer:

C. A reaction that absorbs heat

Explanation:

I do not know Latin, but roughly speaking 'Endo' means inside, and 'thermic' means heat.

There are several types of chemical reactions, two of the important reactions are endothermic and exothermic. An endothermic reaction  absorbs heat. The correct option is C.

The chemical reaction which proceed with the absorption of heat energy is defined as the endothermic reaction. In an endothermic reaction, the system gains heat and hence the enthalpy change ΔH will be positive.

In endothermic reaction, because of the absorption of heat, the enthalpy of the products will be more than that of the reactants. An example of endothermic reaction is shown as:

N₂ (g) + O₂ (g) → 2NO (g)   ΔH = 180.5 kJ

So in endothermic reactions, the reactants absorb heat energy from the surroundings to produce the products. These reactions reduce the temperature of the surrounding area and thereby creates a cooling effect.

Thus the correct option is C.

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Answer:

Molecules are speeding up as boiling occurs.

Explanation:

We have three states of matter;solid liquid and gas. Substances are found in these different states of matter according to the degree of energy and velocity of its particles. Highly energetic particles moving at high velocities are found in the gaseous state. Less energetic particles moving at lesser velocities due to intermolecular forces are found in the liquid state while particles with the least degree of freedom are found in the solid state. Solid particles do not translate but can vibrate or rotate about a fixed position.

When a liquid boils, particles at the surface of the liquid acquire sufficient energy and escape the surface of the liquid. This is because, as energy is supplied in the form of heat during boiling, molecules acquire sufficient energy to speed up their molecular motion and escape the liquid surface as vapour.

Molecules are speeding up as boiling occurs is the statement that best describes the process of arrow 1.

Evaporation is a physical process in which matter transforms from a liquid state to a gaseous state. Generally this process occurs when matter is exposed to high amounts of energy.

When a material is exposed to energy, its particles begin to move and speed up until they break their bonds and are released in the form of gas.

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Answer: 23927 cups of coffee would be required to fill the world record coffee cup.

Explanation:

Volume of cup of coffee = 318 ml

Volume of largest cup (world record coffee cup) of coffee = 2010 gallon  

Volume of largest cup of coffee in ml = [tex]2010\times 3785.41=7608678ml[/tex]  ( 1 gallon = 3785.41 ml)

To find : Number of cups of coffee to fill world record coffee cup = x

Thus as we know :

[tex]{\text {Number of cups of coffee to fill world record coffee cup}}\times {\text {Volume of cup of coffee}}={\text {Volume of largest cup (world record coffee cup) of coffee}}[/tex]

Putting in the values we get:

[tex]x\times 318ml=7608678ml[/tex]

[tex]x=23927[/tex]

Thus 23927 cups of coffee would be required to fill the world record coffee cup.

Answer:

the epigenetic perspective. ... Such variation among organisms with virtually identical chromosomal DNA sequences has largely been attributed to the effects of environment.Explanation:

Answer:

A)P5010

Explanation:

Penta- means 5 and deca/deco- means 10

Answer:

6.125 × 10^-5

Explanation:

You have to move the decimal place 5 times to the right. Remember in scientific notation the first number, (the number that comes before the 10) has to be between 1.0 and 9.99...

Answer:

A. mol/kg

Explanation:

hope it helps .

Answer:

As a general rule, soluble ionic compounds, strong acids, and strong bases should be written as dissociated ions in the complete ionic equation. Insoluble salts and weak acids are written using the neutral molecular formula since they only dissociate to a very small extent in water.

Explanation:

Answer:

F = False

Explanation:

An action plan is a plan that an individual or a firm creates, that contains their objectives, aims, strategies , which they require to achieve their specific goals.

An action plan is very detailed, streamlined and straight to the point. It contains a series or a number of steps or tasks that an individual must embark on in other to achieve their end goal.

WHEN AN ACTION PLAN AS BEEN PUT IN PLACE OR SET IN MOTION, IT CAN BE CHANGED OR ALTERED. This is because the aim of a action plan is to achieve the end goal of an individual or a firm. As long as the changes made in the action plan does not hinder the achievement of those goals then the action plan can be changed.

Some of the very common reasons why action plans are changed or modified includes:

a) To make the action plan more flexible.

b) To track and monitor your progress in achieving your end goal. If there is a delay, you can easily track it out on your action plan and modify it.

In other to create an action plan, it is very important that the goals of such that individual or firm is very well defined and clear from the beginning. Action plans must always be monitored, and updated regularly.

Answer:

F, false

Explanation:

i took the quiz on edge

Answer:

The correct answer is C. Hund's rule.

Hund's rule states that for atoms in their ground state, electrons will occupy orbitals of the same energy level one by one before pairing up. This means that when filling the 3p sublevel, phosphorus should have one electron in each of the three 3p orbitals before any of them start pairing up.

However, in reality, sulfur has a lower ionization energy than phosphorus. This means that it is easier to remove an electron from sulfur than from phosphorus. This contradicts the expectation based on Hund's rule.

Therefore, the fact that sulfur has a lower ionization energy than phosphorus provides evidence that Hund's rule is not the only factor governing the electron configuration and ionization energies of elements. Other factors, such as electron-electron repulsion and the stability of half-filled or filled subshells, also play a role.

Answer:

D. The kinetic energy will increase

Explanation:

Answer:

Hello

I think the third one is correct.

Explanation:

Because when we increase the temperature of a gas the increasing give energy to gas molecules.

Good luck.