Câu hỏi giữa kỳ Anh văn chuyên ngành

Molecular weight is the sum of the atomic weights of all the .... in a molecule.

• Protons

• Electrons

• Neutrons

• Atoms

In a decomposition reaction, a large molecule is..... into its component molecules, atoms, and ions.

• broken down

• combined

• joined

• generated

The smallest unit of any chemical element is called.....

• atom

• proton

• electron

• molecule

The number of protons in the nucleus is the number of....

• atom

• electron

• nucleus

• atomic

.... are two molecules that have the same chemical formula but different structures and properties.

• Monomers

• Isomers

• Polymers

• Homomers

The Latin prefix "sesqui-" means:

• One

• One half

• Double

• One and a half

A chemical attraction between ions with opposite charges is called a….. bond.

• Covalent

• Ionic

• Hydrogen

• Peptide

A…. is characterized by both a definite shape and a definite size.

• Gas

• Liquid

• Solid

• Matter

An element, which consists of……. atoms.

• Only one kind of

• Two or more different kind of

• Homogeneous

• Heterogenous

An……… substance is a substance that consists of atoms of only one kind.

• a.elementary

• b. compound

• c. molecule

• d. impure