CHEMISTRY HIGH SCHOOL

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

Answer 1
Answer:   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.
Answer 2
Answer:

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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Given the reaction below, which is the oxidized substance?
Mg + Cl2 Mg2+ + 2Clmc005-2

Answers

Answer:

Mg+Cl2 = Mg2+2Cl

Explanation:

Firstly balance the equation

2Mg+Cl2=Mg2+2Cl

the oxidized substance=Cl2

Why does the chemical reaction seen here obey the law of conservation of matter? a. because there are the same number of atoms of each element shown on both sides
b. because they both start and end with diatomic (two-atomed) molecules
c. because they both start and end with the same types of particles
d. because they both start and end with two sets of particles eliminate

Answers

Why does the chemical reaction seen here obey the law of conservation of matter?

Answer:

  • Because there are the same number of atoms of each element shown on both sides

Explanation

  • As in chemical reactions, atoms bonds are break and new bonds are formed. As new substance are formed but overall they have same elements, no new elements come from outside or go to outside. In other words , rearrangement of atoms take place but number of atoms remained same.

                            NaOH + HCl -----> NaCl + H2O

  • As in above reaction there are the same number of atoms of each element shown on both sides .
The chemical reaction seen here obey the law of conservation of matter because there are the same number of atoms of each element shown on both sides. The answer is A. Thank you for posting your question here. I hope it helps. 

A covalent bond in which electrons are shared unequally isa. polar.
b. a double bond.
c. ionic.
d. polyatomic.

Answers

Covalentbonds = sharing of electrons between two atoms of the same elements or elementsclose to each other on the periodic table. Usually they are metals sometimesnon-metals. In polar bonds electrons areshared unequally. Non polar bonds share electrons equally.

Final answer:

A covalent bond where electrons are shared unequally is known as a polar bond. This unequal sharing occurs due to differences in electronegativity between the two atoms involved in the bond.

Explanation:

A covalent bond in which electrons are shared unequally is defined as a polar bond. This corresponds to option a) polar. This occurs because one atom is more electronegative and pulls the shared electron pair towards its nucleus making the bond polar, having a partial positive and partial negative end. Option b) a double bond, refers to a covalent bond where two pairs of electrons are shared between atoms. Option c) ionic refers to a bond where electrons are completely transferred from one atom to another and option d) polyatomic refers to a molecule that consists of more than two atoms.

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True or false: (a) For molecules with similar molecular weights, the dispersion forces become stronger as the molecules become more polarizable. (b) For the noble gases the dispersion forces decrease while the boiling points increase as you go down the column in the periodic table. (c) In terms of the total attractive forces for a given substance, dipole–dipole interactions, when present, are always greater than dispersion forces. (d) All other factors being the same, dispersion forces between linear molecules are greater than those between molecules whose shapes are nearly spherical.

Answers

The dispersion force and the dipole force has been the attractive forces that result in the formation of bond within the molecules and result in the change in the properties of the compounds.

The dipole force is a strong force and results in a higher boiling point.

The statements regarding the forces are:

(a) For molecules with similar molecular weights, the dispersion forces become stronger as the molecules become more polarizable.

The statement is true.

(b) For the noble gases the dispersion forces decrease while the boiling points increase as you go down the column in the periodic table.

The statement is true.

(c) In terms of the total attractive forces for a given substance, dipole-dipole interactions, when present, are always greater than dispersion forces.

The statement is false.

(d) All other factors being the same, dispersion forces between linear molecules are greater than those between molecules whose shapes are nearly spherical.

The statement is true.

For more information about the dispersion force, refer to the link:

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Answer:

A ,B- false

C,D- true

Explanation:

Dipole forces always lead to stronger attraction and boiling points than dispersion forces. When linear molecules are involved, they often posses greater dipole forces and higher boiling points. Linear alkanes posses higher boiling points than branched alkanes.

A series of five short lines. The first has an up and a down arrow, and is labeled below 1 s. The second has an up and a down arrow, and is labeled 2 s. The third has an up arrow and no label. The fourth has an up arrow and is labeled 2 p. The fifth has an up arrow and no label. Which element is this?

Answers

234hope it was helpful

Find the number of kilometers in 92.25m.

Answers

The length measurement in kilometers will be -

92.25 x 10⁻³ Kilometers.

We have length measurement of 92.25 m.

We have to determine the number of kilometers in this much length.

How many maters are there in one kilometer ?

In 1 km there are 1000m

According to the question -

Length measurement = L = 1 meter

In kilometers, the length will be = 1 /1000 x 92.25 =

92.25 x 10⁻³ Kilometers.

Therefore, the length measurement in kilometers will be -

92.25 x 10⁻³ Kilometers.

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1000m = 1km
92.25m= ?

We cross multiply
92.25/1000
= 0.09225

Therefore, 92.25m = 0.09225km
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