A new element R shows chemical properties similar to the element sodium. What is the correct formula of a compound formed with R and sulfur?
R₂S
RS₂
RS
R₂S₂​

Answer:

Si.

Explicación:

Si un oficial de policía está controlando la velocidad en la carretera y dispara al vehículo con una pistola de radar. El policía mide la velocidad media del coche con esta pistola de radar. Una pistola de radar es un dispositivo que se utiliza para medir la velocidad de los objetos en movimiento que fue inventado por Bryce K. Brown en el año de 1954. La pistola de radar se utiliza con fines policiales para calcular la velocidad de los vehículos en movimiento.

Answer:

1. False

2. True

3. False

4. False

5. True

6. False

7. True

8. True

9. True

Answer:

In nomenclature of simple molecular compounds, the more electropositive atom is written first and the more electronegative element is written last with an -ide suffix.

The Greek prefixes are used to dictate the number of a given element present in a molecular compound.

Prefixes can be shortened when the ending vowel of the prefix “conflicts” with a starting vowel in the compound.

Common exceptions exist for naming molecular compounds, where trivial or common names are used instead of systematic names, such as ammonia (NH3) instead of nitrogen trihydride or water (H2O) instead of dihydrogen monooxide.

Terms

nomenclatureA set of rules used for forming the names or terms in a particular field of arts or sciences.

electronegativeTending to attract electrons within a chemical bond.

electropositiveTending to not attract electrons (repel) within a chemical bond.

Chemical Nomenclature

The primary function of chemical nomenclature is to ensure that a spoken or written chemical name leaves no ambiguity concerning to what chemical compound the name refers. Each chemical name should refer to a single substance. Today, scientists often refer to chemicals by their common names: for example, water is not often called dihydrogen oxide. However, it is important to be able to recognize and name all chemicals in a standardized way. The most widely accepted format for nomenclature has been established by IUPAC.

Molecular compounds are made when two or more elements share electrons in a covalent bond to connect the elements. Typically, non-metals tend to share electrons, make covalent bonds, and thus, form molecular compounds.

Rules for Naming Molecular Compounds:

Remove the ending of the second element, and add “ide” just like in ionic compounds.

When naming molecular compounds prefixes are used to dictate the number of a given element present in the compound. ” mono-” indicates one, “di-” indicates two, “tri-” is three, “tetra-” is four, “penta-” is five, and “hexa-” is six, “hepta-” is seven, “octo-” is eight, “nona-” is nine, and “deca” is ten.

If there is only one of the first element, you can drop the prefix. For example, CO is carbon monoxide, not monocarbon monoxide.

If there are two vowels in a row that sound the same once the prefix is added (they “conflict”), the extra vowel on the end of the prefix is removed. For example, one oxygen would be monooxide, but instead it’s monoxide. The extra o is dropped.

Generally, the more electropositive atom is written first, followed by the more electronegative atom with an appropriate suffix. For example, H2O (water) can be called dihydrogen monoxide (though it’s not usually). Organic molecules (molecules made of C and H along with other elements) do not follow this rule.

Here are the prefixes in naming molecular compounds:

Mono- 1

Di- 2

Tri- 3

Tetra- 4

Penta- 5

Hexa- 6

Hepta- 7

Octa- 8

Nona- 9

Deca- 10

Molecular compounds are named using a systematic approach of prefixes to indicate the number of each element present in the compound.

I hope it helps ●~●

Answer:

130 mL

Explanation:

2FeCl3(aq) + 3K2S(aq) -----> Fe2S3(s) + 6KCl(aq)

Percent yield = actual yield/theoretical yield × 100

actual yield = 2.75 g

Theoretical yield = x

65= 2.75/x × 100

x= 2.75 × 100/65

x= 4.2 g

Number of moles of FeCl3 = mass/molar mass = 4.2 g/ 162.2 g/mol = 0.026 moles

Then;

n= CV

n= number of moles

C= concentration

V= volume

V= n/C

V= 0.026 moles/ 0.200 M

V= 0.13 L or 130 mL

Explanation:

[tex][{H}^{ + }] = {10}^{ - pH} [/tex]

[tex] = {10}^{ - 11.13} [/tex]

[tex] = {10}^{ (- 11 - 0.13)} [/tex]

[tex] = {10}^{ - 0.13} \times {10}^{ - 11} [/tex]

[tex] = 0.741 \times {10}^{ - 11} \frac{mol}{litre} [/tex]

Answer:

Petroleum refinery capacity in the UAE 2009-2018

In 2018, the total production capacities of all refineries in the UAE were 1.13 metric barrels per day. Total total production capacity of the al-Ruwais refinery in the United Arab Emirates was approximately 817,000 metric barrels per day.

Answer:

Isotope 2

Explanation:

Isotope 2 is the most abundant. Its percent abundance is 78.68% which is the largest percentage, and therefore the most common of the isotopes presented.

Good luck!

[tex]\huge\fcolorbox{red}{pink}{Answer ♥}[/tex]

Solutions for Neutralization of Acidic Lakes. ... A common solution to increase water hardness in acid lakes is to add lime, a high-alkalinity calcium compound to the acid lakes. This method is only temporary and very expensive, as it often needs to be applied every year.

Hope it helps uh ✌️✌️

Answer:

2.2 × 10⁻³ mol

Explanation:

Step 1: Calculate the number of equivalents in 0.50 L of blood

The blood calcium level of 8.8 meq/L.

0.50 L Blood × 8.8 meq/L = 4.4 meq = 4.4 × 10⁻³ eq

Step 2: Calculate the number of moles of calcium

Calcium has a charge of 2. Thus, it has 2 equivalents per mole.

4.4 × 10⁻³ eq × 1 mol/2 eq = 2.2 × 10⁻³ mol

Answer:

C.faste-moving lava flows and explosion of cinder

Answer:

D Period 1, Group 18

Explanation:

it's helium

it's top right corner of the periodic table

Answer:

12.01 grams per mole

Explanation:

theres no sample or example so if theres grams of Carbon, convert it to moles using 12.01g/mol

Answer:

any 5 ways to prevent earth are:

1.using ( 3R) principles Reduce, reuse, and recycle.

2.Educate yourself

3.Conserve water resources and other natural resources

4.Use long-lasting light bulbs.

5.stop deforestation and start afforestaion

Answer:

mg2+ because it is a very good idea

Explanation:

Answer:

it adds to scientific knowledge

Answer:

[tex]12H2O + 2(SO3)2 -> 3(SO4)2[/tex]

Explanation:

see below. This was balanced using the the aggregate redox species method, or ARS for short.

The balanced half equation of the given reaction can be written as:

[tex]SO_3^{2-} + H_2O \longrightarrow SO_4^{2-} +2H^+ +2e^-[/tex]

A chemical equation can be defined as the expression of a reaction in terms of chemical symbols of the elements. A chemical equation of the reaction involves reactants and formed products.

The chemical equation of the reaction in which the number of atoms of the elements is the same on both sides of the chemical equation is a balanced chemical equation.

According to the law of conservation of mass, the total mass of the elements on the reactant side and product side should be the same in a balanced equation.

Given the equation is  SO₃²⁻  →  SO₄²⁻

To balance the oxygen on both sides add water:

H₂O + SO₃²⁻  →  SO₄²⁻

To balance the hydrogen on both sides add H⁺:

H₂O + SO₃²⁻  →  SO₄²⁻ + 2H⁺

To balance the charges, add electrons:

H₂O + SO₃²⁻  →  SO₄²⁻ + 2H⁺ + 2e⁻

Learn more about the balanced chemical equation, here:

brainly.com/question/15052184

#SPJ2

Explanation:

i) Melting point = 15°C and Boiling point = 110°C

ii) The region C on graph there is only liquid state, the region A on graph there is only solid state.

iii) The straight line A1 - B1 shows that the melting point of solid wax and getting converted to liquid form.

iv) Latent heat of vaporization is a physical property of a substance.

It is defined as the heat required to change one mole of liquid at its boiling point under standard atmospheric pressure. 

v) At 'B' the wax is at both solid and liquid state

Answer: 4.93

Explanation:

Answer:

câu trả lời trong hình ảnh

Answer:

liquid  B

Explanation:

because B has a lower bp it needs less time and energy to turn into vapour and is collected into the condenser first

Answer:

total displacement \time

Explanation:

Answer:

No

Can't understand.

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Answer:

Unicellular organisms consist of only one cell and multicellular organisms consist of many cell.

Explanation:

Living things made up of a cell are called unicellular beings. They are very small and simple. In other words, unicellular organisms are those that are formed only by a single cell in which all the vital functions necessary for life are produced. For this reason, they are mostly microscopic organisms. Examples of unicellular organisms are viruses or bacteria.

Multicellular organisms are made up of a large number of cells. They present, therefore, a greater complexity than unicellular organisms in terms of the functions they develop. All current multicellular organisms come from a single cell, that is, they begin their life being unicellular. That is, they are formed from a zygote. Some examples of multicellular organisms are mammals, fungi, and mosses.

So, unicellular organisms consist of only one cell and multicellular organisms consist of many cell.

Answer:

Explanation:

Lead Monoxide: PbO

Nitric Acid: HNO3

PbO + 2 HNO3 ---> Pb(NO3)2 + H2O

Answer:

Explanation:

mono mean single so lead monoxide is PbO

nitric acid is HNO3

both Pb n O are double-charged while H n NO3 are single

so balanced eqn is:

PbO + 2HNO3 -> Pb(NO3)2 + H2O

Answer:

1: because phosphate contain oxide ions so that is base character

Answer:

the reaction is spontaneous

Answer:

Explanation to the following question is as follows;

Explanation:

Any phenomenon that would have the potential to cause severe death or property damage is considered a danger. When the potential for devastation is realised, a hazard becomes a disaster. All catastrophes are risks, but not all risks are catastrophes. Hazards do not always result in devastation.

Answer:

I hope this will help you.

[tex]\huge\fcolorbox{red}{pink}{Answer ♥}[/tex]

Life on Earth is based on carbon, likely because each carbon atom can form bonds with up to four other atoms simultaneously. This quality makes carbon well-suited to form the long chains of molecules that serve as the basis for life as we know it, such as proteins and DNA.

Hope it helps uh ✌️✌️✌️