Review Chemistry Part 2

Front

What is the shape of a molecule with a trigonal planar geometry?

Back

A trigonal planar molecule has three atoms bonded to a central atom, all in the same plane, forming a 120-degree angle between them.

Front

How do you calculate the mass of a substance given its moles and molar mass?

Back

Mass (g) = Moles × Molar Mass (g/mol). For example, for magnesium: 5 moles × 24.305 g/mol = 121.525 g.

Front

What types of atoms participate in a covalent bond?

Back

Covalent bonds are formed between two nonmetals.

Front

Which has a greater mass: 1 mole of lithium, carbon, sodium, or silicon?

Back

1 mole of silicon weighs the most.

Front

What type of chemical reaction is represented by Al(OH)3 → Al2O3 + H2O?

Back

This is a decomposition reaction.

Front

Define molar mass.

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the difference between ionic and covalent bonds?

Back

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

Front

What is a chemical reaction?

Back

A chemical reaction is a process that leads to the transformation of one set of chemical substances to another.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of a substance, defined as containing exactly 6.022 × 10^23 particles (atoms, molecules, etc.).