CHEMISTRY HIGH SCHOOL

Which of the following chemical reactions is an oxidation-reduction reaction? CuSO4 + BaCl2 yields BaSO4 + CuCl2 Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3 N2 + 3H2 yields 2NH3 K2SO4 + BaCl2 yields BaSO4 + 2KCl

Answers

Answer 1

Answer:

Answer : The correct option is, $N_2+3H_2\rightarrow 2NH_3$

Explanation :

(1) $CuSO_4+BaCl_2\rightarrow BaSO_4+CuCl_2$

(2) $Pb(NO_3)_2+2NaCl\rightarrow PbCl_2+2NaNO_3$

(3) $K_2SO_4+BaCl_2\rightarrow BaSO_4+2KCl$

The reactions 1, 2, and 3 are the example of double-displacement reaction in which the cation and anion of the two reactants exchange their places to give two new compounds.

(4) $N_2+3H_2\rightarrow 2NH_3$

This reaction is an example of oxidation-reduction reaction.

Oxidation reaction : It is defined as the reaction in which a substance looses its electrons. In this, oxidation state of an element increases.

Reduction reaction : It is defined as the reaction in which a substance gains electrons. In this, oxidation state of an element decreases.

In this reaction the oxidation state of nitrogen and hydrogen is (0) and the oxidation state of nitrogen and hydrogen in $NH_3$ are, (-3) and (+1). So, from this we conclude that the nitrogen shows reduction reaction and hydrogen shows oxidation reaction.

Hence, the correct option is, $N_2+3H_2\rightarrow 2NH_3$

Answer 2

Answer: The answer is N2 + 3H2 yields 2NH3. The oxidation-reduction reaction means that there is electrons transfer during the reaction which means that the valence changed.

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What is the volume of 4.5 moles of H2 at STP?

Answers

1.0 mole ---------- 22.4 at STP
4.5 moles --------- ?

4.5 * 22.4 / 1.0

= 100.8 L of H₂

Most reactive to least reactive out of Cu, Ca, Pb, Sn, Mg, K, and Na.

Answers

Answer:

Cu,Sn,Pb,Mg,Ca.Na,K

Explanation:

.During the combustion of methane (CH4), one mole of methane gas combines with two moles of oxygen gas (O2) to produce one mole of carbon dioxide gas (CO2) and two moles of water vapor. Which of the following chemical equations correctly represents the combustion of methane described above?

Answers

Answer:

22.4 L methane reacts with 44.8L of oxygen to give 44.8L of CO

2 and 22.4 L of water

Explanation:

From the balanced reaction: One mole(or 1 molecule or 16 g) of CH

reacts with 2 moles (or 2 molecules or 64 g) of oxygen to give one mole (or 1 molecule or 44 g) of CO

and 2 mole (or 2 molecules or 36 g) of water.

For the gaseous system at STP:

22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO

and 44.8 L of water.

and 2 mole (or 2 molecules or 36 g) of water.

For the gaseous system at STP:

22.4 L methane reacts with 44.8 L of oxygen to give 22.4 L of CO

and 44.8 L of water.

Which of the following is true of group 6A?Includes Chlorine

Includes Sulfur

Gain 2 electrons

Tend to form +2 ions

Have 5 valence electrons

Answers

Answer:

The answer to your question is: Includes sulfur and gain two electrons

Explanation:

Includes Chlorine This option is wrong, Chlorine belongs to group VII.

Includes Sulfur This option is true, Group VI includes Oxygen, Sulfur, Selenium, Tellurium.

Gain 2 electrons. This option is true, Elements in group VI have six valence electrons so they gain to electrons to become estable.

Tend to form +2 ions This option is wrong, this elements form -2 ions

Have 5 valence electrons This option is wrong, this elements have 6 valence electrons.

How is geometrical symmetry related to the polarity of a molecule?

Answers

A symmetric shape means the bonds' polarities are exactly equal then it means the polarities cancel each other, resulting to a nonpolar molecule. This is because there will be no available polarity for other substance to attach.

Explanation :

As we know that the geometrical symmetry of the molecule and the polarity of the bonds both are equally important for determining the polarity of the molecule.

The molecule that has zero dipole moment that means it is a geometrical symmetric molecule and the molecule that has some dipole moment that means it is a geometrical asymmetric molecule.

As the molecule is symmetric, the dipole moment will be zero and the molecule will be non-polar.

As the molecule is asymmetric, the dipole moment will not be zero and the molecule will be polar.

Thus, we can say that the a symmetry molecule is non-polar in nature and an asymmetry molecule is a polar molecule.

Which of the following elements is stable?a. Boron, atomic number 5
b. Carbon, atomic number 6
c. Neon, atomic number 10
d. Fluorine, atomic number 9

Answers

Answer:

Neon, atomic number 10, is stable.

Explanation:

Valencia electrons are the electrons found in the last electronic layer (called valence orbitals). These electrons are what determine the ability of the atom to form bonds. When an element joins another, it does so through its valence electrons.

The noble gases include the elements of group 18 of the periodic table. The noble gases are characterized by their very low chemical reactivity because they are very stable. This is because they have the full valence layer (complying with the octet rule, that is, they have 8 electrons at their last energy level, with the exception of helium that has 2 electrons), causing them to have a low tendency to capture or release electrons . That is why they are also called inert gases.

The Neon, whose atomic number is 10, belongs to the group of noble gases. So this element is stable.

Neon is the most stable because it has 8 valence electrons. when an element has full number of valence electrons, they become stable.

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