Chem Sem1 Review #1

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. Example: CO2 (carbon dioxide) is a compound made of carbon and oxygen.

Front

What is a polar covalent bond?

Back

A polar covalent bond is a type of chemical bond where a pair of electrons is unequally shared between two atoms, resulting in a molecule with a slight electrical dipole moment. Example: C---H (carbon-hydrogen bond) is polar.

Front

What is the molar mass of carbon?

Back

The molar mass of carbon is 12.01 g/mol.

Front

What are atomic orbitals?

Back

Atomic orbitals are regions of space around the nucleus of an atom where there is a high probability of finding electrons.

Front

How many neutrons are in a helium atom?

Back

A helium atom has 2 neutrons.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements that are chemically combined.

Front

What is the significance of the atomic number?

Back

The atomic number is the number of protons in the nucleus of an atom, which determines the element's identity and its position in the periodic table.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements. Example: O2 (oxygen gas) is a molecule made of two oxygen atoms.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonds involve the sharing of electrons between atoms.

Front

What is the role of electrons in chemical bonding?

Back

Electrons, particularly the valence electrons, are involved in forming chemical bonds between atoms, determining how atoms interact and combine.