Chemistry of Life

When is an ionic bond formed?

• when electrons are shared

• when protons are shared

• when oppositely charged atoms gain or lose electrons

• when oppositely charged atoms gain or lose a proton

What makes carbon so important to life?

• bonding properties

• its place on the Periodic Table

• it is a reactant in all chemical reactions

• it is an enzyme

What gives water so many important properties for life?

• adhesion and cohesion

• the amount of carbon in each molecule

• energy released exothermically

• hydrogen bonds give it polarity

What makes a chemical reaction?

• matter is conserved

• breaking and forming of chemical bonds

• when products form reactants

• when you do a lab

What are the smallest basic units of matter?

• molecules

• atoms

• elements

• 7th graders

Exothermic reactions

• absorb more energy than they release

• are cold

• do not use bond energy for activation

• release more energy than they absorb

Which of the following solutions has the highest Hydrogen ion concentration?

• a solution with a pH of 1

• a solution with a pH of 4

• a solution with a pH of 7

• a solution with a pH of 10

A catalyzed reaction

• increases the products made

• uses less activation energy to get started

• has a slower reaction rate

• uses more reactants throughout the reaction

Enzymes act on

• products

• proteins

• amino acids

• substrates

Atoms that share electrons are

• in a covalent bond

• in an ionic bond

• are usually salts

• always metals