Acc. Biology Chemistry of Life (Chapter 2)

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

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What gives water so many important properties for life?

• adhesion and cohesion

• the amount of carbon in each molecule

• energy released exothermically

• hydrogen bonds

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What makes a chemical reaction?

• matter is conserved

• breaking and forming of chemical bonds

• when products form reactants

• when you do a lab

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What are the smallest basic units of matter?

• molecules

• atoms

• elements

• 7th graders

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Exothermic reactions

• absorb more energy than they release

• are cold

• do not use bond energy for activation

• release more energy than they absorb

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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

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Atoms that share electrons are

• in a covalent bond

• in an ionic bond

• are usually salts

• always metals

What are the reactants in this chemical equation?

• CH₄ and 2O₂

• carbon and oxygen

• CO₂ and 2 H₂O

• water and methane

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