Chemistry NCFE 2018-19 #1-15

Front

Which element will form covalent bonds with chlorine?

Back

Carbon is the element that forms covalent bonds with chlorine due to its ability to share electrons.

Front

What is the product of the radioactive decay of a gold isotope represented by the equation: 174Au → 170Ir + ?

Back

The product is an alpha particle.

Front

What is the name of the compound with the chemical formula CoF3?

Back

The compound is called cobalt(III) fluoride.

Front

What is the chemical formula for chromium(III) oxide?

Back

The chemical formula is Cr2O3.

Front

Which type of bonding or intermolecular forces is/are weakest?

Back

London dispersion forces are the weakest type of intermolecular forces.

Front

Define covalent bond.

Back

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.

Front

What is radioactive decay?

Back

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting radiation.

Front

What is the significance of the oxidation state in compounds?

Back

The oxidation state indicates the degree of oxidation of an atom in a compound, which helps in understanding the electron transfer during reactions.

Front

Explain the difference between ionic and covalent bonding.

Back

Ionic bonding involves the transfer of electrons from one atom to another, while covalent bonding involves the sharing of electrons.

Front

What is the formula for calculating the number of neutrons in an atom?

Back

Number of neutrons = Atomic mass - Atomic number.