How many atoms are in 0.05 moles of xenon gas at STP?2.2 x 10^23

3.0 x 10^22

6.0 x 10^23

3.0 x 10^24

The diagram shows 5 eletctron in the outermost shell of Nitrogen atom out of which 3 electrons are involved in the bond formation with 3Hydrogen atoms.

The type of bond in ammonia is Covalent.

What is covalent bond ?

Covalent bond is the bond formed by mutual Sharing of electrons by both the atoms taking part in the bond formation.

Nitrogen has 5valence electrons of which only 3 are shares with the 3 atoms of hydrogen (one electron shares with one atom of hydrogen)

Hence, type of  bond in ammonia is covalent.

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Final answer:

Ammonia (NH3) has a covalent bonding type resulting in a tetrahedral electron-pair geometry, but because of the lone pair, the molecular structure is trigonal pyramidal. The bond angle is slightly less than 109.5⁰ due to the lone pair occupying more space.

Explanation:

The type of bonding in ammonia, which has a molecule structure as shown in the question, is covalent bonding. The ammonia molecule, NH3, has one lone pair and three single bonds which gives it a tetrahedral electron-pair geometry, as shown in Figure 7.18. However, because one of these regions is a lone pair that is not counted in the molecular structure, the molecule assumes a trigonal pyramidal shape.

The lone pair occupies more space than the single bonds, which leads to a slight deviation in the actual bond angles from the idealised angles. The angle in the ammonia molecule is slightly less than 109.5⁰ due to this additional electron pair's space occupancy.

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Answer:

direction

Explanation:

Answer:

CO2,H2S,HALON,FREON that's is the four toxicants that are heavier than air

Final answer:

Silver and gold are two elements which have properties similar to copper. These common properties include sheen, malleability, ductility, and their ability to conduct heat and electricity, attributable to their similar atomic structures.

Explanation:

Two elements that have properties similar to copper, which is a metal, include silver (Ag) and gold (Au). All these elements fit into the same category - metals, that demonstrate certain characteristics:

• They appear shiny, and have the ability to be formed into different shapes (malleable) and drawn into wires (ductile).
• They act as good conductors of heat and electricity.

These properties stem from their similar atomic structures, placed in the same group on the periodic table.

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Answer:

d) Hydrogen chloride

Explanation:

Hydrogen chloride (HCl) is not a mixture. It is a chemical compound composed of two elements, hydrogen (H) and chlorine (Cl), combined in a fixed ratio. In contrast, the other options (antibiotic, evaporated milk, brewed coffee) all involve mixtures:

Antibiotics are typically mixtures of various chemical compounds used for medicinal purposes.

Evaporated milk is a mixture of milk and water with the water removed.

Brewed coffee is a mixture of water and coffee grounds, often with other components like sugar or cream added.

Hydrogen chloride, on the other hand, is a pure compound with a defined chemical formula (HCl) and consistent composition.

Answer:

For 3: The correct answer is Option A.

For 4: The correct answer is Option C.

For 5: The correct answer is Option D.

Explanation:

• For 3:

There are 2 types of solutions on the basis of pH.

An acid is defined as the chemical substance which looses hydrogen ions in a solution.

A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.

A base is defined as the chemical substance which looses hydroxide ions in a solution.

A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.

Hence, the correct answer is Option A.

• For 4:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

For the given chemical equation:

is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion

HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.

Hence, the correct answer is Option C.

• For 5:

Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

For the given options:

Option A:

The chemical equation follows:

This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.

Option B:

The chemical equation follows:

This is an example of neutralization reaction.

Option C:

The chemical equation follows:

This is an example of neutralization reaction.

Option D:

The chemical equation follows:

This is an example of double displacement reaction.

Hence, the correct answer is Option D.