Chapter 2 Review (semester exam prep) The chemistry of life

Match the following subatomic particles that make up atoms.

• positively charged particle

• Proton

• neutrally charged particle

• Electron

• negatively charged particle

• Neutron

Two or more different atoms are combined in definite proportions in any

• symbol.

• isotope.

• element.

• compound.

A covalent bond is formed by the

• transfer of electrons.

• sharing of electrons.

• gaining of electrons.

• losing of electrons.

A compound that produces hydrogen ions in solution is a(n)

• salt.

• acid.

• base.

• polymer.

Tags

NGSS.HS-PS1-1

The force of attraction between different kinds of molecules.

• cohesion

• adhesion

• ionic bond

• covalent bond

A(n) ​ (a)   is a compound that prevents sharp, sudden changes in pH.

• buffer
• enzyme
• solute
• base

An enzyme speeds up a reaction by

• lowering the activation energy.

• raising the activation energy.

• releasing energy.

• absorbing energy.

Chlorine bleach has a pH between 11 and 13. It is a(n)

• acid.

• substrate.

• base.

• neutral.

The elements or compounds that enter into a chemical reaction are called

• products.

• catalysts.

• active sites.

• reactants.

The center of an atom, which contains the protons and neutrons.

• nucleus

• element

• ion

• solution

Tags

NGSS.HS-PS1-8