Chemistry of Life

When is an ionic bond formed?

• when electrons are shared

• when protons are shared

• when oppositely charged atoms give or take electrons

• when oppositely charged atoms gain or lose a proton

What makes carbon so important to life?

• It's 4 valence electrons allows it to bond in many ways

• 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

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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

Enzymes are...

• are proteins that lower activation energy (help cause reactions)

• Hormones than impact gene expression

• nucleic acids that make up DNA

• The reactants of a chemical reaction that must be present

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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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NGSS.MS-PS1-2

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Activation energy

• is the term for the amount of energy in each reactant

• helps the enzyme to increase the rate of the reaction

• is the term for the amount of energy that needs to be added for a chemical reaction to start

• is the term for the amount of energy released by the reaction after it starts