What is the oxidation number of an element? PLz help. Will give brainliest to correct answer. explanation helpful but not required. Dont answer unless you know

Answer:

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Explanation:

The former, known as a 'Lewis dot diagram,' indicates a pair of shared electrons between the atomic symbols, while the latter, known as a 'Lewis structure,' uses a dash to indicate the pair of shared electrons that form a covalent bond. More complicated molecules are depicted this way as well.

Explanation:

The halogen family and noble gases are similar in just one particular way, they are groups of non-metals. All members of these two groups are categorized as non-metals.

Here are some of the differences between them;

Answer:

hail, btw have a nice day

Answer:

Hail

Explanation:

I got it right on my test

Answer:

Acid rain

Explanation:

The independent variable in the hypothesis statement is the acid rain. An independent variable is usually the cause in an experiment.

This variable give rises to the effects observed as the dependent variable.

In the presence of the acid rain, the fish population will increase.

The dependent variable is the fish population or number of fishes.

The independent variable is the acid rain as it is the cause of the effect observed on the fish population.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 0.917 × 2.5 = 2.2925

We have the final answer as

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Answer:. 2.3 g

Explanation:

Answer:

Viscosity

Explanation:

The viscosity of the liquid is the independent variable. The flow rate is the dependent variable in this hypothesis.

The statement given is called the hypothesis. It is a form of scientific guess into a phenomenon.

Answer:

33

Explanation:

Answer:

The answer is that light is faster than sound.

Explanation:

A good example is of lightning and thunder during a thunderstorm.

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The level of organization of a complex, multicellular organism such as a mouse, starting with the cell, is. The cellular level, the tissue level, the organ level, the organ system, and lastly the organism.

The level of organization of the body is the organization of the body with the smallest unit like the cell. As we know, the smallest unit of life is the cell. So the organization of energy in living organisms starts with a cell.

The cellular level is the cells, the cell combine to form tissue and many tissues join together to form an organ. Many organs join together to create an organ system, and the organ system establishes an organism.

Thus, starting with the cell, the organization of a complex, multicellular creature like a mouse is. cell level, tissue level, organ level, the organ system, and finally organism level.

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Answer:

See below!

Explanation:

An acid (A) will have acid in the name.  It will also have a hydrogen bonded to an electronegative compound.  A molecular compound (M) will have nonmetals and/or hydrogen.  An ionic compound (I) will have nonmetals and first and second column metals.  It could also include charged compounds.  A transition metal (TM) will have a transition metal in the compound.

The formulas for TM and I are made by balancing the charges of the atoms to equal zero.  The formulas for M can be found from the name itself.  The formulas for A have to be memorized.

TM  ==>  copper (II) oxide  ==>  CuO

A  ==>  hydrosulfuric acid  ==>  H₂S

TM  ==>  iron (III) fluoride  ==>  FeF₃

TM  ==>  lead (II) chlorate  ==>  PbCl₂

A  ==>  hydrochloric acid  ==> HCl

M  ==> dihydrogen monoxide  ==>  H₂O

A  ==>  sulfurous acid  ==>  H₂SO₃

I  ==>  potassium oxide  ==>  KO

I ==>  ammonium hydroxide  ==>  NH₄OH

M  ==> nitrogen trioxide  ==>  NO₃

I  ==>  aluminum phosphate  ==>  AlPO₄

To name ionic (I) compounds, simply put the name of the metal with the nonmetal.  But, for the nonmetal change, the ending to "-ide".  To name acids (A), say hydro- with the atom/compound it is attached to and end with acid.

I  ==>  MgSO₄  ==>  magnesium sulfate

I  ==>  HgS  ==>  mercury sulfide

I  ==>  Na₂S  ==>  sodium sulfide

A  ==>  HF  ==>  hydrofluoric acid

I  ==>  KCN  ==>  potassium cyanide

Answer:

CH4 + 2 O2 → CO2 + 2 H2O

Explanation:

There are one mole of O2 on the left side and on the right side there are three moles of O2. And to fix it you would need to make it two moles of O2 to have four molecules of O2 on the left side. Then you would make two moles of H2O to have a total of four moles of O2 on the right. Therefore, CH4 + 2 O2 → CO2 + 2 H2O is the answer.

Answer:

1,2,1,2

Explanation:

hope this helped!

Answer:

you can burn it.

Explanation:

that is the way to change paper

Answer:

Less soil erosion

Explanation:

Due to the low amount of rainfall in this region, it is easier to say that the region compared to other ecoregion will suffer less soil erosion.

Erosion is usually the washing away of the top layer of the soil. Rainfall is one of the most important element that causes erosion. Surface runoff for an extended period of time can remove the topmost layer of the earth on which plant can grow. This starves the soil of its rich nutrients and minerals.

Answer:

B

Explanation:

Answer:

B. Always add the acid to the water slowly, taking a moment to stir between drops

Answer:

At least four glucose residues separate α‑1,6 linkages.

The number of sites for enzyme action on a glycogen molecule is increased through α‑1,6 linkages.

The reaction that forms α-1,6 linkages is catalyzed by a branching enzyme.

Explanation:

Glycogen is a polymer of glucose and is the primary carbohydrate storage form in animals. The polymer is composed of glucose units linked in alpha(1-4) straight chains and alpha(1-6) branches which occur on average every 8-12 straight chain glucose residues. It has a reducing and non-reducing end. The end of the molecule containing a free carbon number one on glucose is called a reducing end. The other ends are all called non-reducing ends.

During the breakdown of glycogen, glucose units are removed one at a time from the non-reducing end until a point about four glucose residues away from a branch which will require a debranching enzyme to act for further breakdown to occur. Since many such branches occur in a glycogen molecule, it makes it possible for breakdown of glycogen to occur at many points speedily.

Glycogen branching enzyme is required to make alpha (1-6) glycosidic bonds. It transfers 6 to 7 glucose units from the non-reducing end of a straight chain glycogen molecule to an interior position of the same or another glycogen molecule forming alpha (1-6) bonds.

Answer:

5 moles of oxygen occupy 120 dm³ volume.

Explanation:

Given data:

Number of moles = 5 mol

Volume of gas = ?

Solution:

In question it is given gas is at room temperature and pressure.

One mole of any gas at room room temperature and pressure occupy volume of 24 dm³. Thus,

5 mole of gas occupy volume of,

5 mol × 24 dm³/1 mol

120 dm³

5 moles of oxygen occupy 120 dm³ volume.

Answer:

2.1 moles of water formed.

Explanation:

Given data:

Moles of water formed = ?

Moles of Ni(OH) = 4.20 mol

Solution:

Chemical equation:

2Ni(OH)    →  Ni₂O + H₂O

Now we will compare the moles of Ni(OH)  with water.

             Ni(OH)           :            H₂O

                2                 :              1

              4.20             :            1/2×4.20 = 2.1 mol

2.1 moles of water formed.

Answer: Inertia

Explanation:

Answer:To proceed scientifically, you could measure several properties of the unknown liquid and compare them with the properties of known substances. You might observe and measure such properties as color, odor, texture, density, boiling point, and freezing point.

Explanation:

Answer:

2

Explanation:

Answer:

answer is D

Explanation:

Answer: the molar mass will be too high

Explanation:

The chemical formula for an ionic compound represents the simplest ratio of ions that results in an electrically neutral compound. That is option D.

An ionic chemical compound is defined as the type of chemical compound that contains both the oppositely-charged ions of a metal and a nonmetal are attracted reacting with each other to form an ionic bond.

When represented as a chemical formula, it is the simplest ratio of ions that results in an electrically neutral compound.

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Answer:

A . The work done stretching a spring is transformed into stored energy in the spring

Explanation:

The work done stretching a spring is transformed into stored energy in the spring is clear indication of the law of conservation of energy.

The law of conservation of energy states that "energy is neither created nor destroyed but transformed from one form to another".

This is an energy transformation process.

Answer:

Easy 46 million turkeys

Medium three days

Hard: 1934

Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.

Explanation:

hop tis helped

Answer:

125 cubic meters

Explanation:

Subtract 375-250=125 cubic meters

Answer:

i think use water displacement with just one 10c

Explanation:

Answer:

67.6 years is the time the isotope take to decay from 0.900g to 0.170g

Explanation:

The radioactive decay follows first order law:

Ln [A] = -kt + ln[A]₀

Where [A] is concentration after time t,

k is decay constant:

k = ln 2 / t(1/2)

k = ln2 / 28.1 years

k = 0.02467 years⁻¹

[A]₀ = Initial concentration.

We can replace concentration and use the mass of the isotope:

Ln [A] = -kt + ln[A]₀

Ln [0.170g] = -0.02467 years⁻¹t + ln[0.900g]

-1.667 = -0.02467 years⁻¹t

t =

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

Half-life can be defined as the times required by the substance to reduce to half of its initial concentration.

The half-life can be expressed as:

Amount left = Initial amount [tex]\times[/tex] [tex]\rm \dfrac{1}{2}^\dfrac{time}{Half-life}[/tex]

From the given:

0.17 g = 0.9 [tex]\rm \times\;\dfrac{1}{2}^\dfrac{t}{28.1}[/tex]

[tex]\rm \dfrac{0.17}{0.9}[/tex] = [tex]\rm \dfrac{1}{2}^\dfrac{t}{28.1}[/tex]

0.188 = [tex]\rm (0.5)^\dfrac{t}{28.1}[/tex]

Taking log on both the sides,

log 0.188 = [tex]\rm \dfrac{t}{28.1}\;\times[/tex] log 0.5

2.411 = [tex]\rm\dfrac{t}{28.1}[/tex]

t = 2.411 [tex]\times[/tex] 28.1 years

Time = 67.75 years.

The time required for the sample to reduce to 0.170 grams has been 67.75 years.

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