is Sc2S3 polar or non polar or ionic

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:

beryllium has a higher ionization energy because its radius is smaller. boron has a higher ionization energy because its radius is smaller.

Answer:

Letter D

Explanation:

Answer: Inertia

Explanation:

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:

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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how did u even find me again i wanna see if people are

me with a wey some one made

Answer:ok

Explanation:

Answer:

True

Explanation:

All irreversible reactions go to completion because the process cannot proceed in the backward direction.

A reversible reaction is one that does not go into completion in one direction.

An irreversible direction completely uses up the reactants to form the products and goes into completion.

These reactions can only proceed in one direction and not both.

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:

3.1 moles of ammonia

18.67× 10²³ molecules

Mass = 52.7 g

Explanation:

Given data:

Number of atoms of hydrogen = 5.68×10²⁴ atoms

A) Number of molecules of ammonia = ?

Solution:

First of all we will calculate the number of moles of hydrogen.

1 mole = 6.022× 10²³ atoms

5.68×10²⁴ atoms × 1 mol / 6.022× 10²³ atoms

0.94×10¹ mol

9.4 moles of hydrogen

Moles of ammonia:

3 moles of hydrogen are present in one mole of ammonia.

9.4 moles of hydrogen = 1/3×9.4 =

3.1 moles of ammonia

Number of molecules of ammonia:

1 mole contain 6.022× 10²³ molecules.

3.1 mol × 6.022× 10²³ molecules / 1 mol

18.67× 10²³ molecules

c) Mass of sample = ?

Mass = number of moles × molar mass

Mass = 3.1 moles × 17 g/mol

Mass = 52.7 g

Lead + Iron(II) Sulfate = Lead Sulfate + Iron

Lead - Pb

Plumbum Element 82 Bulk Lead 鉛 Lead (native) Lead-210 Pb-210 210Pb

Iron(II) Sulfate - FeSO4

Iron Sulfate (1:1) Iron(II) Sulfate (1:1) Ferrous Sulfate (anhydrous) Ferrous Sulfate Ferrous Sulfate (anh.) Iron(2+) Sulfate (anh.) FeSO4 Fe(II)SO4

Lead Sulfate - PbSO4

Anglesite

iron - Fe

Element 26 Fer 26Fe Eisen Ferrum Hierro Ferrum Metallicum 鐵

Answer:

159g

Explanation:

Copper (I) sulfide is formed by the chemical reaction between copper and sulfur. Copper is a limiting reagent that results in the formation of 190.26 grams of copper(I) sulfide.

A limiting reagent is defined as the reactant that gets completely utilized in the reaction and affects the amount of the product formation. On the contrary, the excess reagent is present in more amounts.

Given,

Mass of copper = 127 gm

Mass of sulfur = 41 gm

Moles of copper:

n = mass ÷ molar mass

n = 127 ÷ 63.546

n = 1.99

Moles of sulfur:

n = 41 ÷ 32.065

n = 1.27

The reaction is shown as:

Cu + S → CuS

Here, 9 g of sulfur remains unreacted and hence is an excess reagent, and copper being consumed is a limiting reagent.

Here, 1 mole of copper reacts to form 1 mole of copper sulfide hence, 1.99 moles of Cu produces, 1.99 moles of copper sulfide.

Mass of CuS is calculated as:

Mass = moles × molar mass

Mass = 1.99 mol × 95.611 g/mol

= 190.26 grams

Therefore, 127 gm of copper and 41 gm of sulfur produces 190.26 grams of copper sulfide.

Learn more about limiting reagents, here:

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#SPJ2

Answer:

53.4%

Explanation:

N₂ + 3H₂ → 2NH₃

Given that:

26.3 g of H₂ react with N₂ to produce 79.0 g of NH₃

Then:

The number of moles of H₂ = 26.3g of H₂ * (1 mol of H₂/ 2.02g of H₂)

= 13.05 mol of H₂

The number of moles of NH₃ = 13.05 mol of H₂ * ( 2mol of NH₃/ 3 mol of H₂)

= 8.697 mol of NH₃

The mass of NH₃ = 8.697 mol of NH₃ *( 17.04g of NH₃/ 1 mol of NH₃) = 148.1 g of NH₃

The percent yield = actual yield/ theoretical yield * 100%

The percent yield = ( 79.0 g/ 148.1 g )* 100%

The percent yield ≅ 53.4 %

Answer:

53.4

Explanation:

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:

A stronger base.

Explanation:

In neutralization reactions, when an acid is mixed with a base, both species react to different degrees that depends on the concentrations and volumes of the acid and the base. In this case the student mixes a strong base (250 mL) with a strong acid (100 mL), what will happen is that the substance that is going to predominate (strong base) will be the one that is in greater quantity than the other, so the solution will remain a strong base.

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:C - 3.115 g

Explanation:Correct

Answer:

energy from a source that is not depleted when used, such as wind or solar power.

Explanation:

Explanation:

renewable energy is energy from a source that is not depleted when used such as wind or solar power.

Hope this helps :)

Answer:

f = 0.6× 10¹⁶ Hz

Explanation:

Given data:

Wavelength of radiation = 5.00 × 10⁻⁸ m

Frequency of radiation = ?

Solution:

Formula:

Speed of light = wavelength × frequency

speed of light = 3 × 10⁸m/s

Now we will put he values in formula.

3 × 10⁸m/s = 5.00 × 10⁻⁸ m ×  f

f = 3 × 10⁸m/s / 5.00 × 10⁻⁸ m

f = 0.6× 10¹⁶ s⁻¹

s⁻¹ = Hz

f = 0.6× 10¹⁶ Hz

Answer:

125 cubic meters

Explanation:

Subtract 375-250=125 cubic meters

Answer:

B

Explanation:

Answer:

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

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:

If the pH of a solution is less than 7, the solution is called acidic; if the pH is about 7, the solution is neutral; if the pH is greater than 7, the solution is is called basic. In an acidic solution, then, the concentration of hydrogen ions is greater than the concentration of hydroxide ions.

Explanation:

Not sure about the context of the question, but you can check with a ph scale tester.

Answer:

i dont see tha pic

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.

For more information about half-life, refer to the link:

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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:

you can burn it.

Explanation:

that is the way to change paper