The elements fluorine chlorine and iodine are all part of the same blank on the periodic table


Answer 1
Answer: They are all in the same family, also known as a group.  They're the same thing.
Answer 2
Answer: Group......they're all in group 7

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Identify and justify the type of heat transfer used to boil noodles for macaroni and cheese.



Radiation and conduction and forced convection


During cooking noodles , i)  hot air flows by forced convection.

ii) Heat is distributed from heating source by radiation.

iii) Conduction takes place from container to noodles or product to be cooked.





Solve the following equation (y = 1.2345x – 0.6789) for x, given that y = 0.570



x = 1.01166

General Formulas and Concepts:


Order of Operations: BPEMDAS

  1. Brackets
  2. Parenthesis
  3. Exponents
  4. Multiplication
  5. Division
  6. Addition
  7. Subtraction
  • Left to Right  

Equality Properties

  • Multiplication Property of Equality
  • Division Property of Equality
  • Addition Property of Equality
  • Subtraction Property of Equality


Step 1: Define

y = 1.2345x - 0.6789

y = 0.570

Step 2: Solve for x

  1. Substitute in y:                                                                                                0.570 = 1.2345x - 0.6789
  2. [Addition Property of Equality] Add 0.6789 on both sides:                        1.2489 = 1.2345x
  3. [Division Property of Equality] Divide 1.2345 on both sides:                      1.01166 = x
  4. Rewrite/Rearrange:                                                                                        x = 1.01166

Which half reaction correctly describes the oxidation that is taking place? Z n (s) right arrow upper Z n superscript 2 plus (a q) plus e superscript minus. Upper Z n (s) right arrow upper Z n superscript 2 plus (a q) plus 2 e superscript minus. Upper C u superscript 2 plus (a q) plus 2 e superscript minus right arrow upper C u (s). Upper C u superscript 2 plus (a q) plus e superscript minus right arrow upper C u (s).


The  half reaction that correctly describes the oxidation that is taking place in electrochemical cell containing Zn-Cu couple .


Electrochemical cell

It is the cell that converts the chemical energy in to electric energy .The reaction staking place in it are spontaneous that is occur by itself .

In it the oxidation and reduction both occur .

The one with high electrode potential looses electrons that is it shows : oxidation

Th one with lower electrode potential gains electrons that is  it shows :Reduction .

In this galvanic cell (Zn-Cu couple )

The oxidation occurs at anode that is :


The reduction occurs at cathode :

Cu²⁺  + 2e--->Cu


The correct answer is option B ;)



Find the average atomic mass of neon,given the atomic masses and relative abundance of its 3 isotopes


The element neon consists of 3 isotopes with masses 19.92, 20.99, and 21.99 amu. The relative abundance of these 3 isotopes are 90.92, 0.25, and 8.83 percent, respectively.

HELP MEEEEEEEEEEEEEEEEEEEEEEEEE The theory of continental drift proposes that the Earth's continents may have once been united as a supercontinent but have drifted apart over time. What was the name of the supercontinent?
Question 8 options:






The answer i think you're wanting is Pangaea 
Answer would be B.)Pangaea

The molar mass of H2O is 18.01 g/mol. The molar mass of O2 is 32.00 g/mol. What mass of H2O, in grams, must react to produce 50.00 g of O2?


The study of chemicals is called chemistry. There are two types of solution in the chemistry and these are acid and base.

The correct answer to the question is as follows:-

What are moles?
  • The mole is the base unit of the amount of substance in the International System of Units.
  • It is defined as exactly 6.02214076×10²³ elementary entities, which may be atoms, molecules, ions, or electrons.

The reaction is as follows:-

2H_2 + O_2" alt="2H_2O ---> 2H_2 + O_2" align="absmiddle" class="latex-formula">

The moles are as follows:-

  • (= 1.563mol O2
  • = 3.125mol H2O
  • = 56.28g H2O needed to make 50.00g O2

Hence, the correct answer is 56.28.

For more information about the question, refer to the link:-

2H2O ---> 2H2 + O2
1. (50.00g O2)/(32.00g/mol O2) = 1.563mol O2

2. (1.563mol O2)(2mol H2O/1mol O2) = 3.125mol H2O

3. (3.125mol H2O)(18.01g/mol H2O) = 56.28g H2O needed to make 50.00g O2

Which description explains how inertia changes the effects of gravity on objects in the solar system?


The answer is; D

Inertia is the tendency of an object to resist change to its velocity and direction.  The bigger the mass of an object the higher its inertia. In space, the celestial bodies with a bigger mass have more inertia and have a higher gravitation pull (because they bend space-time more than smaller objects). The gravitational force of bigger objects influences on other celestial bodies and beats their inertia force by causing them to change direction and speed.    

answer is D on edgeunity


A major component of gasoline is octane c8h18 . when octane is burned in air, it chemically reacts with oxygen gas o2 to produce carbon dioxide co2 and water h2o . what mass of oxygen gas is consumed by the reaction of 6.0g of octane?


The mass of oxygen gas consumed by the reaction of 6.0 g of octane is  21 .0 g

Further Explanation  Hydrocarbons  
  • Hydrocarbons are types of compounds that are mostly made up of hydrogen and carbon elements. However other hydrocarbons are made up of carbon, hydrogen and oxygen elements.
  • The major types of hydrocarbons include, alkanes, alkenes, alkynes, alcohols, and alkanoic acids.  
  • Alkanes are saturated hydrocarbons while alkenes and alkynes are unsaturated hydrocarbons containing only carbon and hydrogen atoms.  
  • Alcohols and alkanoic acids contains hydrogen, oxygen and carbon atoms.
Combustion of Hydrocarbons  
  • Hydrocarbons burn in air to form carbon dioxide and water as the only products.

That is;

For hydrocarbons with carbon and hydrogen

CxHy + O2(g) → CO2(g) + H2O(g)  

For Example;

Combustion of octane;

2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(l)

Therefore; Two moles of octane combines with 25 moles of oxygen gas to yield 16 moles of carbon dioxide and 18 moles of water.

Therefore, we can calculate the mass of oxygen consumed by the reaction of 6.0 g of octane.

Step 1; Number of moles of octane

Number of moles = mass/ molar mass

Molar mass of octane = 114.23 g/mol

Number of moles of octane in 6.0 g

            = 6.0 g/114.23 g/mol

            = 0.0525 moles

Step 2: Number of moles of Oxygen gas used

From the balanced equation;

Two moles of octane combines with 25 moles of oxygen gas to yield 16 moles of carbon dioxide and 18 moles of water.

Therefore; moles of oxygen gas = (0.0525/2)× 25

                                                     = 0.65625 moles of Oxygen gas

Step 3: Mass of oxygen gas

Mass = number of moles × molar mass

Molar mass of oxygen gas = 32.0 g/mol

Mass of oxygen = 0.65625 moles × 32.0 g/mole

                          = 21 g of oxygen gas

Keywords: Combustion, hydrocarbons  

Learn more about:  
  • Hydrocarbons:
  • Combustion of hydrocarbons:
  • Major types of hydrocarbons:

Level: High school

Subject: Chemistry  

Topic: Organic chemistry  

Sub-topic: Combustion of hydrocarbons

The reaction involved in the problem is called a combustion reaction. The balanced chemical reaction is expressed as:

C8H18 + 25/2O2  = 8CO2 + 9H2O

TO determine the amount of oxygen gas needed to completely react the given amount of C8H18, we use the amount of the other reactant and the relation of the substances from the chemical equation. We do as follows:

6.0 g C8H18 ( 1 mol C8H18 / 114.26 g C8H18) ( 25/2 mol O2 / 1 mol C8H18 ) ( 32 g O2 / 1 mol O2 ) = 21.00 g O2

Therefore, to completely react 6 g of octane we need at least 21 g of oxygen gas.

In which type of reaction do two lighter nuclei combine to form one heavier nucleus? (1) combustion (3) nuclear fission
(2) reduction (4) nuclear fusion



Nuclear Fusion


In nuclear fusion two lighter nuclei combine together in order to form one heavier nucleus.

For example, the energy generated from the Sun is made by nuclear fusion: Two hydrogen (H, atomic number 1) nuclei combine in order to form one helium  (He, atomic number 2) nucleus.

Nuclear fission is the opposite reaction, in which one heavier nucleus splits into two lighter nuclei.

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