CHEMISTRY HIGH SCHOOL

Given the incomplete equation representing an organic addition reaction:X(g) + Cl2(g)==> XCl2(g)
Which compound could be represented by X?
(1) CH (3) C3H8
(2) C2H4 (4) C4H10

Answers

Answer 1
Answer:

The organic compound X in the given reaction is ethylene, C₂H₄. The two chlorine atoms are joined to the double bond of ethylene and form  C₂H₄Cl₂. Hence, option 2 is correct.

What is halogenation ?

Halogenation is the electrophilic addition of  any halogen atom such as Cl. F etc. to an organic compound mostly in the presence of acids. Halogens are more reactive towards alkenes and alkynes.

The unsaturated centers in the organic compound are electron deficient and they attract negative halogen ions forming respective halides. Ethylene is the primary alkene with the skeleton CH₂ =CH₂.

The incoming Cl groups attack the double bond and joins the carbon atom to form CH₂Cl  - CH₂Cl or C₂H₄Cl₂. Hence, the compound X in the given reaction is C₂H₄Cl₂. Thus, option 2 is correct.

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Answer 2
Answer: Only C2H4 will react to give this product since it is the only reactant that contains a carbon-carbon double bond.

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What is a mixture in which something is dissolved in a liquid ?
How many atoms are in 36 g of bromine?
What is required for reactants to form bonds? a. energy output b. energy input c. equilibrium d. exchange reaction

Which chemical equation is correctly balanced?(1) H2(g) + O2(g)=> H2O(g)
(2) N2(g) + H2(g) =>NH3(g)
(3) 2NaCl(s)=>Na(s) + Cl2(g)
(4) 2KCl(s) => 2K(s) + Cl2(g)

Answers

  2KCl(s) => 2K(s) + Cl2(g) is correctly balanced. Becuase 2 K, 2 Cl on the left, and 2 K, 2 Cl on the right.

The correct balanced chemicalequation is 2KCl(s) => 2K(s) + Cl2(g).

The correct balanced chemical equation from the options provided is (4) 2KCl(s) => 2K(s) + Cl2(g).

In this equation, two molecules of potassium chloride (KCl) react to form two molecules of potassium (K) and one molecule of chlorine gas (Cl2). This equation is balanced because the number of atoms of each element is equal on both sides of the equation.

For example, there are two atoms of potassium and two atoms of chlorine on both sides of the equation, ensuring the equation is balanced.

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The mass of a substance is the mass per mole of its entities, where the term entities can describe

Answers

Answer:

            The molar mass of a substance is the mass per mole of its entities, where the term entities can describe atoms, molecules, ions or formula units.

Explanation:

                  Molar mass is the mass of any compound divided by mole. Means, if any chemical is given a specific molar mass it means this mass is being given by 6.022 × 10²³ entities of that chemical.

                  The molar mass of any compound is calculated by adding up the atomic masses of all atoms present in that chemical.

Example:

Molar Mass of H₂ =  1.008 + 1.008  =  2.016 g/mol

Molar Mass of NaOH  =  23 + 16 + 1  =  40 g/mol

Molar Mass of HCl =  1 + 35.5  =  36.5 g/mol

Which of these processes indicates that smelting copper is a chemical changea)it involves melting copper to form liquid metal
b)it involves heating charcoal to high tempuratures
c)it involves drawing copper into long wires
d)it involves breaking molecular bonds between copper compounds

Answers

The correct answer is D:


it involves breaking molecular bonds between copper compounds .


The explanation :


-when we melt a copper it is a physical change because the substance is still copper and have the same shape.


- but for example Burning a copper it is a chemical change. Fire activates a chemical reaction between copper and oxygen.


-The oxygen in the air reacts with the copper and the chemical bonds are broken.


- the chemical change is changing the other compound bonded to the copper atoms.


So, the correct answer is D
Answer is d. The material can be phsycal changes into a differnt shape or state (gas, liquid, solid) and its will still be essentially copper. A chemical change is changing what other elements or compound is bonded to the copper atoms

What is a problem commonly associated with nuclear power facilities?(1) A small quantity of energy is produced.
(2) Reaction products contribute to acid rain.
(3) It is impossible to control nuclear fission.
(4) It is difficult to dispose of wastes

Answers

The problem that is commonly associated with nuclear power facilities is "It is difficult to dispose of wastes" Option D. This is further explained below.

What are nuclear power facilities?

Generally, Nuclear power plants are simply defined as using the heat generated by nuclear fission to heat water. Atoms are torn apart in nuclear fission to generate smaller atoms.

In conclusion, nuclear power facilities have waste compounds that are hard to decompose.

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(1) False, lots of energy is actually produced from nuclear fuel, if we didn't get much then we probably wouldn't use it
(2) False, its burning coal that contributes to acid rain, since it contains sulfur
(3) False again, we can control the reaction with aptly named control rods, which are typically made of boron, to absorb some of the neutrons flying around in the chain reaction
(4) True, radioactive waste is very difficult to dispose of, and is also very dangerous. Sources of radiation can remain so for millions of years

Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by a. chemical bonds.
b. nuclear energy.
c. sharing nuclei.
d. attractive forces.

Answers

Elements can combine to form molecules, like o2 or co2. elements combine to form molecules and these elements are joined together by  chemical bonds i.e covalent bond in this molecule so option A is correct 
hope this helps

Answer:

a. Chemical bonds.

Explanation:

Hello,

In this case, it is necessary to know that when two elements are not stable by their own they should bond with an other atom of the same element via chemical bonds whereby the valence electrons act as bridges connecting the atoms. Some examples are diatomic-gaseous hydrogen, oxygen, nitrogen, chlorine, iodine, fluorine and bromine. Moreover, such chemical bonding is represented by lines binding the elements as shown on the attached picture.

Best regards.

A few pieces of dry ice, CO2(s), at -78°C are placed in a flask that contains air at 21°C. The flask is sealed by placing an uninflated balloon over the mouth of the flask. As the balloon inflates, the dry ice disappears and no liquid is observed in the flask.State the direction of heat flow that occurs between the dry ice and the air in the flask.
Write the name of the process that occurs as the dry ice undergoes a phase change in the flask. [1]
Compare the entropy of the CO2 molecules in the dry ice to the entropy of the CO2 molecules in the inflated balloon.

Answers

Answer:

  • Heat flows from the air into the dry ice.
  • Sublimation (its when a solid becomes a gas without becoming a liquid first).
  • CO2 molecules in gaseous phse has more entropy than in solid phase.

Explanation:

  • To sublimate dry ice needs to fain energy, wich is provided by the surrounding air.
  • Solid is the more condensated state of matter, so it has less entropy than any other state of matter.
The direction of heat flow is from surroundings to system (air to ice), the dry ice is subliminating.
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