Unit 2.1 Review (Chemistry, Water, Enzymes)

Which pair of molecules are both compounds?

• H₂, CO₂

• H₂O, N₂

• CO₂, H₂O

• O₂, C₆H₁₂O₆

Tags

NGSS.MS-PS1-1

Which conclusion is supported by this model?

• Hydrogen atoms in water molecules are only attracted to other hydrogen atoms.

• Oxygen atoms in water molecules are attracted to both oxygen atoms and hydrogen atoms.

• Oxygen atoms in water molecules are also attracted to hydrogen atoms in other water molecules.

• Hydrogen atoms in water molecules are only attracted to an oxygen atom in the same water molecule.

Which property of water is most responsible for water moving from the roots to the leaves of a plant?

• osmosis

• adhesion / capillary action

• low boiling point

• high specific heat

Which of the following is NOT a property of water?

• high specific heat

• low boiling point

• cohesion

• adhesion

Tags

NGSS.HS-ESS2-5

How many hydrogen atoms are in this chemical formula: 2H₂O?

• 4 hydrogen atoms

• 2 hydrogen atoms

• 1 hydrogen atom

• 3 hydrogen atoms

Tags

NGSS.MS-PS1-1

Law of conservation of mass states that

• matter is created

• matter is neither created nor destroyed

• matter is destroyed

• matter does not change

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NGSS.HS-PS1-7

Why do atoms bond?

• Atoms bond because they have a need to have their outermost level of electrons be "full".

• Atoms bond because they need to complete their valence electrons to 9.

• Atoms bond when they have a complete outer shell of electrons.

• All of the above

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Using the information in the graph, choose the correct statement below.

• More energy would be released than absorbed in the reaction.

• The enzyme raised the activation energy required for the reaction.

• The reactants in this reaction have less energy than the products.

• Energy is absorbed in this reaction.

Tags

NGSS.HS-PS1-4

Using the graph pictured, which statement is accurate when comparing the reactants with the products? Choose the letter of the correct answer.

• The reactants have more mass than the products.

• The reactants form more quickly than the products.

• The bonds of the reactants contain more energy than the bonds of the products.

• The bonds of the reactants contain the same amount of energy as the bonds of the products.

Tags

NGSS.HS-PS1-4

Which of these explains how a large increase in temperature would most likely affect the function of the enzyme?

• The enzyme’s effectiveness would increase, because it would have more energy to catalyze the reaction.

• The enzyme’s effectiveness would increase, because it would interact with more of the reactants.

• The enzyme’s effectiveness would decrease, because it would change shape and be less able to catalyze the reaction.

• The enzyme’s effectiveness would decrease, because it would no longer be able to provide the energy needed to bond the monomers.