8. What is the maximum number of electrons in the second principal energy level? 8 32 2 18

Answer:

dependent

controlled

controlled

independent

independent

controlled

dependent

controlled

dependent

dependent

Explanation:

I HOPE IT HELPS :)

Answer:

False

Explanation:

Not all of it but some of it. Hope this helps! (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧

The mass and charge must be balanced so that the compound formed is neutral. The limiting reactant determines the amount of the precipitate that can be formed.

When we talk about an ionic equation, we are talking about the kind of equation that is able to show the ions that are able to undergo a change in a given reaction. We know that in many cases the ionic reaction would lead to the formation of a precipitate and this is the solid product that is obtained when we happen to mix two solutions that are known to be aqueous solutions.

Having made all that introduction, we know that a compound is said to be neutral when the charges in the species that form the compound could be seen as being balanced. This is the reason why the mass and charge must be balanced when we are dealing with an ionic reaction equation.

The factor that determines the amount of precipitate that would form is the limiting reactant of the process.

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Explanation:

The answer would be Berium because it can mix as well with other elements in the periodic table.

Barium is regarded as the most reactive elements out of all the options

provided.

Barium is an element with symbol Ba and atomic number 56. It belongs to

Group 2 metals whose reactivity increases as we go down the group.

The alkaline earth metals which are in Group 2 of the Periodic Table include

: beryllium, magnesium, calcium, strontium, barium, and radium

The increase in reactivity down the group is as a result of the decreasing

ionization energy required to form new compounds. The Ionization energy

decreases due to more inner shells and increase in distance from the

nucleus.

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Answer:

chịu

Explanation:

Answer: 8 moles

Explanation: The Law of Conservation states that matter can neither be created nor destroyed. Therefore you must have the same mass after reaction, that you have had before reaction.

A reaction must obeys the law of conservation of mass. This law was postulated by the scientist A. Lavoisier. So if we have  8 moles of Iron atoms in the products then we have 8 moles of Iron atoms in the reactants.

The law of conservation of mass states that the mass can neither be created nor be destroyed, but it can be transformed from one form to another. In other words matter is neither created nor destroyed in a chemical reaction.

A balanced equation states that the number of atoms of reactants and products on both sides of the equation are equal. There will be no change in the number of atoms of reactants and products before and after the reaction.

Here when we start with 8 moles of iron atoms from the reactant side then the number of moles of products obtained is also 8 moles. So that the reaction will be balanced.

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The mass of the solid aluminum that forms are 192.73 grams

To determine the mass of solid aluminum that forms, we need to use stoichiometry and the balanced chemical equation for the reaction between magnesium and aluminum nitrate.

The balanced chemical equation is:

3 Mg + 2 Al(\(NO_{3}\))3 → 3 Mg(\(NO_{3}\))2 + 2 Al

The equation shows that 3 moles of magnesium react with 2 moles of aluminum to produce 2 moles of aluminum nitrate.

To calculate the mass of solid aluminum, we need to know the amount of magnesium used. Given that the volume of the magnesium is 150.0 mL and its density is 1.738 g/cm³, we can calculate the mass of magnesium using the formula:

Mass = Volume × Density

Mass of magnesium = 150.0 mL × 1.738 g/cm³ = 260.7 g

Now, using the molar mass of magnesium (24.31 g/mol) and the molar ratio from the balanced equation, we can determine the moles of magnesium used:

Moles of magnesium = Mass of magnesium / Molar mass of magnesium

= 260.7 g / 24.31 g/mol

= 10.72 mol

According to the stoichiometry of the balanced equation, the ratio of moles of magnesium to moles of aluminum is 3:2. Therefore, the moles of aluminum formed will be:

Moles of aluminum = (2/3) × Moles of magnesium

= (2/3) × 10.72 mol

= 7.15 mol

Finally, we can calculate the mass of solid aluminum using its molar mass (26.98 g/mol):

Mass of aluminum = Moles of aluminum × Molar mass of aluminum

= 7.15 mol × 26.98 g/mol

= 192.73 g

Therefore, the mass of the solid aluminum that forms is approximately 192.73 grams.

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Answer:

An increased population in younger women. Studies show that younger women may have more children.

I can't put too much complex information or brainly will delete this.

I hope this answers your question! Thanks, and have a wonderful day.

In an ecosystem with an increase in population of young women there can be an increase in the number of births.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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Answer:

5 hours

Explanation:

Answer:it's a

Explanation:

if you are adapting to an environment you must make change for the greater good. it's a

Answer:

its D

Explanation:

i got it on my quiz

Answer:

the color black absorbs energy which in turn will make u hot. the color white reflects energy which in turn will keep u cool

Explanation:

Answer:

The answer is c

Explanation:

The answer is c because dark colored clothes absorb more electromagnetic waves than a white t-shirt because lighter only reflects

This element is in group 1.

According to the octet rule, this element would be expected to form an ion with a charge of +1.

If X is in period 5, the ion formed has the same electron configuration as the noble gas Krypton

The symbol for the ion is Rb⁺

Electronic configuration refers to the arrangement of electrons in the orbitals of an atom or molecule, indicating the energy level of the electrons, the number of electrons in each energy level, and the number of electrons in each orbital.

Considering the given element:

It has one valence electron, hence it is in group 1. Group 1 elements form ions with a charge of +1.

Losing one electron will give the ion the same electron configuration as Kyrton since it is the noble gas in Period 4.

The element is rubidium and the ion is Rb⁺.

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Answer:

A

Explanation:

The number of protons indicates the element so we know it's potassium. To get the number of neutrons you subtract the number of protons (19) from the mass number which for potassium is 39.

39-19=20 neutrons

Because you have 18 neutrons then yours would be an isotope.

Answer: A. Isotope of potassium(K)

Explanation: Founders Educere answer.

Answer:

1.68 mol Ca(NO₃)₂

General Formulas and Concepts:

Atomic Structure

Stoichiometry

Explanation:

Step 1: Define

[Given] 275 g Ca(NO₃)₂

[Solve] mol Ca(NO₃)₂

Step 2: Identify Conversions

[PT] Molar Mass of Ca: 40.08 g/mol

[PT] Molar Mass of N: 14.01 g/mol

[PT] Molar Mass of O: 16.00 g/mol

Molar Mass of Ca(NO₃)₂: 40.08 + 2[14.01 + 3(16.00)] = 164.10 g/mol

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

1.67581 mol Ca(NO₃)₂ ≈ 1.68 mol Ca(NO₃)₂

Answer:

1.68 mol Ca(NO₃)₂

Explanation:

The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B

The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.

Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.

In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.

Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.

Option B

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Answer

All the options apply

Procedure

Generally speaking, metals have the following characteristics:

• high melting points.

• good conductors of electricity.

• good conductors of heat.

• high density.

• malleable.

• ductile

• bright luster.

Answer:

Bromine loses an electron.

Explanation:

Hello there!

In this case, according to the given chemical reaction, it will be possible for us to realize that as the reaction progresses, we see that the bromine, as it is initially negative, it increases the oxidation state as it loses an electron for which it is oxidized.

Moreover, no change is potassium is evidenced as it remains as the cation in the reaction; therefore, the answer is Bromine loses an electron.

Regards!

Answer:

The above answer is correct

Explanation:

I took the test

The model shown is a ball and stick model of a water molecule showing  atomic structure of a water molecule consisting of two atoms of hydrogen bonded to an oxygen atom.

Models are representations in the form of diagrams, pictures, or illustration of concepts, ideas, or structures of other objects.

In science, models are used to represent molecules and atoms of substances.

Some common models used in chemistry to represent the molecules of substances are:

The model shown is a ball and stick model of a water molecule.

The atomic structure of a water molecule consists of two atoms of hydrogen bonded to an oxygen atom.

In conclusion, models are used to represent the structure of other substances or concepts.

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Specialized brown fat cells take advantage of oxidative phosphorylation to generate heat as they contain a carrier protein that dissipates the proton gradient across the inner mitochondrial membrane.

oxidative phosphorylation is when in mitochondrion the proton gradient does is the production of ATP from ADP. This depends on the oxidative reaction happening in the mitochondria. During  oxidative phosphorylation electrons  from NADH and FADH₂ combine with oxygen and then releases the energy from the oxidation or reduction reaction that is used to synthesis of ATP from ADP

Thus, Specialized brown fat cells take advantage of oxidative phosphorylation to generate heat as they contain a carrier protein that dissipates the proton gradient across the inner mitochondrial membrane.

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Polymers are large molecules made up of repeating subunits called monomers, and they are essential building blocks for many cellular structures and processes.

A molecule is a group of two or more atoms that are chemically bonded together. Molecules are the fundamental units of compounds, which are substances made up of two or more different types of atoms.

Molecules can have a variety of sizes and shapes, depending on the number and arrangement of atoms. Some molecules are simple, consisting of just a few atoms, while others are much larger and more complex, such as proteins or DNA. The properties and behavior of a substance depend largely on the types of molecules it contains and how those molecules interact with each other.

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1. The constituent gases of air are:

2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.

3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.

4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.

5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.

6. Air is useful to us in various ways. Three points highlighting the importance of air are:

7. Three properties of air include:

Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.

8. Four effects of air pollution include:

9. Causes of pollution:

10. Two control measures for air pollution include:

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Answer:

83.000

Step-by-step explanation:

8.3 × 10⁴

= 8.3 × (10 × 10 × 10 × 10)

= 8.3 × (100 × 10 × 10)

= 8.3 × (100 × 100)

= 8.3 × 10.000

= 83.000

Conclusion:

The result of 8.3 × 10⁴ is 83.000

\( \)

The chemical reactions that take place between magnesium and zinc compounds are complex. When magnesium and zinc are combined, it results in a reduction-oxidation (redox) reaction. A similar pattern was observed in test tubes 3 and 4 and test tubes 5 and 6.

The conclusion that can be drawn is the law of conservation of mass.The law of conservation of mass states that in a closed system, the mass of the reactants is always equal to the mass of the products. This means that the same number and type of atoms that are present in the reactants will also be present in the products. This law is relevant in this experiment because when the magnesium and zinc compounds were combined, they reacted to form a new compound with a different mass. This new compound was the result of a redox reaction, which involves the transfer of electrons from one atom to another.Therefore, when test tubes 1 and 2 were combined, the magnesium and zinc reacted to form a new compound, and the same process occurred in test tubes 3 and 4 and test tubes 5 and 6. In each case, the mass of the products was equal to the mass of the reactants, demonstrating the law of conservation of mass. The general conclusion that can be drawn is that the law of conservation of mass is applicable in chemical reactions and helps us to understand the chemical changes that occur when elements and compounds are combined.

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Answer:

5.00 moles O₂

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

3.01 × 10²⁴ molecules O₂

Step 2: Convert

\(3.01 \cdot 10^{24} \ mc \ O_2(\frac{1 \ mol \ O_2}{6.022 \cdot 10^{23} \ mc \ O_2} )\) = 4.99834 moles O₂

Step 3: Check

We are given 3 sig figs. Follow sig fig rules and round.

4.99834 moles O₂ ≈ 5.00 moles O₂

The states change that solid caffeine passes through in order to become gas is ;  Solid caffeine --- > liquid form -----> solid form  ----->gaseous form

Caffeine is an alkaloid that is slightly soluble in hot water but we make use of dichloromethane because of the solubility of caffeine in an organic medium whereby the solid caffeine is converted to liquid.

next step is the use of anhydrous solids to remove the water component of the solution to get back the solid form of the caffeine. the organic solvent is evaporated, to purify the new solid form of caffeine.

Finally the solid form of caffeine undergoes sublimation ( changes from solid to gas ) to obtain a purer solid caffeine.

The solid caffeine undergoes ;

Hence we can conclude that the states of change that solid caffeine passes through in order to become gas is ; Solid caffeine --- > liquid form -----> solid form  ----->gaseous form .

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The given reaction has ΔG value  -12207KJ. Therefore, the given reaction is a spontaneous reaction as value of ΔG is negative.

A spontaneous process refers to anything that happens by itself, without external energy input. A ball is going to roll down an incline, water will flow downhill, ice will melt into water, radioactive elements will decay, and iron will rust, for instance. It is impossible for a reaction to not be spontaneous if it is exothermic (H negative) and increases the entropy for the system (S positive). The system's overall heat capacity is measured in enthalpy. The system's unpredictability is gauged by entropy.

ΔG=ΔH-T×ΔS

ΔG=11-298×41

     = -12207KJ

Since ΔG is negative, reaction is spontaneous

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K and Br

Ionic bonds form through the transfer of electrons.

Ionic Bonds

Ionic bonds form when 2 atoms or molecules transfer electrons between each other. This transfer of electrons changes the atoms into ions. Ions are charged particles, and where ionic bonds get their name from. In an ionic bond, one atom will lose electrons and become positively charged; this particle is known as a cation. The atom that gains electrons and becomes negatively charged is known as an anion.

Identifying Ionic Bonds

One of the easiest ways to identify an ionic bond is by identifying the types of atoms that are bonding. In most cases, when a metal and nonmetal bond, an ionic bond will form. This is due to the large difference in electronegativity between metals and nonmetals. This leads to the metal being a cation and the nonmetal being an anion. Since K (potassium) is a metal and Br (bromine) is a nonmental, they will form an ionic bond.

To find metals and nonmetals we can look at the periodic table. Metals are on the left side of the table and make up the majority of the elements. Nonmetals are on the right side of the table.

Answer:

\(N _{2} H _{3} {}^{3 + } \)

Answer:The formula of magnesium chloride is MgCl2 . The molar mass of MgCl2 is (24.30 + 2 × 35.45) g/mol=95.20 g/mol .

Explanation: