Pretest - 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

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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

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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 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

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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

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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

The building blocks of most living things contain the element

• carbon

• nitrogen

• calcium

• sodium

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What are the products in this chemical reaction?

• calcium and oxygen

• Ca and CaO

• 2Ca and O₂

• 2CaO

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