Someone help me with this pls

Answer:

Valence electrons are the outermost of  electrons.

Explanation:

valence electrons are the outermost electrons of an atom located in the shell/ orbit

The statement which is true is Core electrons effectively shield outer

electrons from nuclear charge.

Core electrons are those which are in close proximity with the nucleus.  The

core electrons repel the outer electrons farther away from the nucleus to

shield it from nuclear charge.

The valence electrons are usually found in the outermost part of the shell

and they are the easiest to remove due to the fact that they have to achieve

a stable octet configuration which makes them easily removed during

chemical reactions.

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Answer: core electrons effectively shield outer electrons from nuclear charge

Explanation:

Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.

A homogeneous mixture is defined as having a fairly uniform form and composition, so many homogeneous mixtures are referred to as solutions whereas heterogeneous mixtures are defined as separate substances or phases. The three states or states of matter are gas, liquid and solid.

Some examples of mixtures that include mixtures of sand and water, mixtures of sugar and salt, and mixtures of lime juice and water.

In homogenous solution, particles are distributed uniformly and have uniform composition while in heterogenous solution, particles are distributed non-uniformly and have non-uniform composition

Thus, Imagine A represents a heterogeneous mixture as it is a mixture composition that does not remain the same throughout the mixture whereas Imagine B represents a homogeneous mixture as it does not have any change or irregularity.

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Sorry I accidentally touched it

Answer:

f4

Explanation:

your welcome.

Answer:

Number of protons is 9

Number of electrons is 9

Number of neutrons is 10

Explanation:

Atomic number refers to the number of protons or electrons in an atom, so the electrons and protons are 9.

Atomic mass is the sum of the number of protons and neutrons.

Therefore, there are 10 neutrons in the atom's nucleus

Answer:

Ok

Explanation:

Answer:

2

Explanation:

energy produced in nuclear fusion or even fission is due to mass defect and it can be calculated by Einstein equation e=mc2

The statement, that describes energy released by a nuclear fusion reaction is produced is "mass is converted to energy."

Nuclear fusion is the process by which two light atomic nuclei merge to produce a single heavier one, releasing huge quantities of energy in the process.

A fusion reaction occurs when two light nuclei combine to form a single heavy nucleus. Because the overall mass of the resulting single nucleus is smaller than the mass of the two initial nuclei, the process releases energy.

That is, nuclear energy refers to the energy released as a result of mass loss during the nuclear fusion processes. Both of these processes transform mass loss into energy in accordance with Einstein's mass-energy ratio, E = [tex]mc^{2}[/tex]. As a result of the fusion reaction, mass is destroyed and energy is released.

Hence, the correct answer is 2.

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Answer:

B  

Explanation:

Answer:

answers

B

Explanation:

Explicaciónexplicacaca

Answer:

Mitochondria

Explanation:

Mitochondria is the powerhouse of the cell, convert sustenance into energy, fueling the cell's activities. In addition to power, mitochondria also produce reactive oxygen

Answer:

"powerhouse"- mitochondria

"stores spare parts"-  vacuole

"surrounds the nucleus"- nuclear membrane

"controls the cell"- nucleus

"pathways"- endoplasmic reticulum

"inner layer"- cell membrane

"outer plant covering"- cell wall

"fills up the cell"- ctyoplasm

"collects light"- chloroplasts

"packages proteins"- golgi

"holds info"-chromosomes

"makes protein"-ribosomes

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Answer:

Frozen Meats – Frozen raw meats that are properly vacuum sealed can be stored in the freezer from 1-3 years depending on the type of meat. However, raw meat that is not vacuum sealed will only last 1-12 months depending on the meat.

Explanation:

hop this helps

Answer: Six months or three years

Explanation: Frozen meats, poultry, and fish can last in the freezer for up to six months and when they are vacuum sealed, frozen meats can stay fresh and free from freezer burn for up to 3 years.

Sodium: Na+

Iron (II): Fe2+

Iron (III): Fe3+

Titanium (IV): Ti4+

Vanadium (V): V5+

Ammonium: NH4+

I hope this helps! :)

Answer:

atomic number

Explanation:

The periodic table is a table that lists all of the chemical elements in order of atomic number, starting with hydrogen and ending with oganesson. The number of protons in the nucleus of an atom of a certain element is its atomic number.

Have a good day :)

Answer:

Both Iron Man and Spider-Man are quite powerful in the comic books, but we think that Spider-Man would be able to defeat Iron Man. Despite his powers, Iron Man is still just a man in a suit, while Spider-Man has actual superpowers and we think they could easily cancel all of Iron Man's advantages

Explanation:

The new (final) pressure of the sample of gas is equal to 2.5 Liters.

Given the following data:

Note: The initial volume was doubled.

To determine the new (final) pressure of the sample of gas, we would apply Boyle's law:

Mathematically, Boyle's law is given by the formula;

[tex]PV = k\\\\P_1V_1 = P_2V_2[/tex]

Where;

Making [tex]P_2[/tex] the subject of formula, we have:

[tex]P_2 =\frac{P_1V_1}{V_2}[/tex]

Substituting the given parameters into the formula, we have;

[tex]P_2 = \frac{5.0 \times 2.0}{4.0} \\\\P_2 = \frac{10}{4.0}[/tex]

New volume = 2.5 Liters

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Answer:

4

Explanation:

Elements in group 14 have 4 valence electrons. Meaning that to achieve a stable octet they need to either gain or lose 4 electrons in total.

Answer:

0.1gram

Explanation:

mass = no of moles × molar mass

Answer:

Air is made up of 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and other gases in meager amounts.

This problem is giving information about a nylon polymer whose molar mass is 15,000 amu (atomic mass units).

The first subject of matter here, is to recall the monomeric molecular formula of nylon which is C₁₂H₂₂N₂O₂, and the definition of monomer (basic molecule able to react and form a polymer) and polymer (assembling of monomers).

Next, we calculate the molar mass of the monomer of nylon:

[tex]12*12.01+22*1.01+2*14.01+2*16.00=226.31amu[/tex]

Finally, the number of units is calculated by dividing the molar mass of the polymer and the monomers:

[tex]n=\frac{15000}{226.31} =66.2[/tex]

Which is about 66 monomers.

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Answer:

66 monomers

Explanation:

Answer:

the anwser is landforms can be created by erosion

Explanation:

Answer: 0.023 moles of CaO.

Explanation:

The balanced equation tells us that we'll get 2 moles of CaO for every one mole of O2.  Since we have 0.046 moles of O2, we'll get 0.023 moles of CaO.  (2 sig figs)

Answer:

D

Explanation:

Hope it helps

The result he hope for he should be happy with himself after following a strict diet and exercise routine.

Fitness is defined as to be able to go about one's everyday activities without difficulty, without getting exhausted, and with enough energy to spare for leisure. Body composition, flexibility, muscular strength, muscular endurance, and cardiorespiratory endurance are the five facets of physical fitness. Physical activity can strengthen your bones and muscles, help you maintain a healthy weight, increase your ability to carry out daily tasks, and improve your cognitive health.

Exercise is defined as a bodily action that maintains or improves physical health and wellness overall.  Exercise science is a field that investigates movement as well as the corresponding functional reactions and adaptations.

Thus, the result he hope for he should be happy with himself after following a strict diet and exercise routine.

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Answer:

54.75 mL

Explanation:

First calculate the number of moles of NaCl in the 150mL solution of NaCl

0.0365 moles should be present on 1000cm3 or 1dm3 of water.

1L = 1 dm3

1 mL = 1 / 1000 dm3

150 mL = 150/1000 dm3 = 0.15 dm3

If x moles are present in 0.15 dm3,

x/ 0.15 = 0.0365

We get x= 0.0365 × 0.15 mol

Now x amount of moles should be taken from the initial 0.100 M NaCl solution

So 0.1 moldm-3 = 0.0365× 0.15 mol / V

we get V = 0.05475 dm3

V= 0.05475 L

V= 54.75 mL

When the mixture of ions undergoes electrolysis, Br- is most easily oxidized.

Electrolysis refers to the decomposition of a solution by the passage of direct current through it. During electrolysis, a specie is oxidized and another specie is reduced since it is a redox reaction.

Among all the ions; Mg2+ , Cu2+ ,F-, Cl-, Br-, the ion that is most easily oxidized in Br- which is oxidized to Br2.

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Answer:

Look at the screenshot below.

Those are your answers!

Good Luck.

Explanation:

The number of valence electrons for neutral atoms is the same as the number of the atom's main group.A periodic table element's column can be used to determine its main group number.For instance, carbon, which belongs to group 4, has four valence electrons.

Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements?

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A chemical reaction is a process that can lead to a change of state, the outcome of a chemical reaction can ultimately lead to the formation of a new substance.

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We know that water is tasteless, odorless, and transparent. In small quantities, it is also colorless. However, when a large amount of water is observed, as in a lake or the ocean, it is actually light blue in color. The blue hue of water is an intrinsic property and is caused by selective absorption and scattering of white light. These and other properties of water depend on its chemical structure.The transparency of water is important for organisms that live in water. Because water is transparent, sunlight can pass through it. Sunlight is needed by water plants and other water organisms for photosynthesis.Chemical Structure of WaterEach molecule of water consists of one atom of oxygen and two atoms of hydrogen, so it has the chemical formula H2O. The arrangement of atoms in a water molecule explains many of water’s chemical properties. In each water molecule, the nucleus of the oxygen atom (with 8 positively charged protons) attracts electrons much more strongly than do the hydrogen nuclei (with only one positively charged proton). This results in a negative electrical charge near the oxygen atom (due to the "pull" of the negatively charged electrons toward the oxygen nucleus) and a positive electrical charge near the hydrogen atoms. A difference in electrical charge between different parts of a molecule is called polarity. A polar molecule is a molecule in which part of the molecule is positively charged and part of the molecule is negatively charged.

•Hydrogen Bonding-

Opposite electrical charges attract one another. Therefore, the positive part of one water molecule is attracted to the negative parts of other water molecules. Because of this attraction, bonds form between hydrogen and oxygen atoms of adjacent water molecules. This type of bond always involves a hydrogen atom, so it is called a hydrogen bond. Hydrogen bonds are bonds between molecules, and they are not as strong as bonds within molecules. Nonetheless, they help hold water molecules together.

•Sticky, Wet Water-

Water has some unusual properties due to its hydrogen bonds. One property is cohesion, the tendency for water molecules to stick together. The cohesive forces between water molecules are responsible for the phenomenon known as surface tension. The molecules at the surface do not have other like molecules on all sides of them and consequently they cohere more strongly to those directly associated with them on the surface. For example, if you drop a tiny amount of water onto a very smooth surface, the water molecules will stick together and form a droplet, rather than spread out over the surface. The same thing happens when water slowly drips from a leaky faucet. The water doesn't fall from the faucet as individual water molecules but as droplets of water.

•Density of Ice and Water-

The melting point of water is 0°C. Below this temperature, water is a solid (ice). Unlike most chemical substances, water in a solid state has a lower density than water in a liquid state. This is because water expands when it freezes. Again, hydrogen bonding is the reason. Hydrogen bonds cause water molecules to line up less efficiently in ice than in liquid water. As a result, water molecules are spaced farther apart in ice, giving ice a lower density than liquid water. A substance with lower density floats on a substance with higher density. This explains why ice floats on liquid water, whereas many other solids sink to the bottom of liquid water.In a large body of water, such as a lake or the ocean, the water with the greatest density always sinks to the bottom. Water is most dense at about 4°C. As a result, the water at the bottom of a lake or the ocean usually has temperature of about 4°C. In climates with cold winters, this layer of 4°C water insulates the bottom of a lake from freezing temperatures. Lake organisms such as fish can survive the winter by staying in this cold, but unfrozen, water at the bottom of the lake.

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