2nd Six Weeks TEST Review Part II

The building block of matter

• electron
• cell
• atom
• proton

Which of these represents a chemical compound?

• H
• C
• P
• H₂O

A chemical reaction is a process by which atoms or groups of atoms in substances are

• dissolved in other substances
• ionized by the loss of protons
• mixed together with atoms in other substances
• reorganized into different substances

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which equation satisfies the law of conservation of matter?

• CH₄ + 2O₂ = CO₂ + 2H₂O
• 2CH₄ + 2O₂ = 2CO₂ + 2H₂O
• 4CH₄ + 2O₂ = CO₂ + 2H₂O
• CH₄ + 2O₂ = 4CO₂ + 2H₂O

Tags

NGSS.MS-PS1-5

What cannot take place during a chemical reaction?

• formation of new atoms
• bonds breaking between atoms
• formation of new molecules
• bonds forming between atoms

Tags

NGSS.HS-PS1-7

Two substances are combined and heat is produced.  Does this provide evidence that a chemical reaction took place?

• Yes, because energy is absorbed
• Yes, because energy is released
• No, because heat is not a chemical
• No, because this would be a physical change

Which is the best description of activation energy?

• heat added to initiate a reaction
• heat released as the reaction proceeds
• heat stored within the reactant molecules
• heat stored within the porduct molecules

Tags

NGSS.HS-PS1-4

Which is true in a covalent bond?

• The bond forms between ions
• The bond forms when electrons are shared
• The bond holds atoms weakly
• The bond is caused by van der Waals forces

Consider this energy diagram for a chemical reaction.  Overall, is energy released or absorbed?

• released, because the reaction is initiated by the addition of heat
• released, because the energy level of the reactants is greater than that of the products
• absorbed, because the energy level decreases during the reaction
• absorbed, because the energy level of the products is greater than that of the reactants

Tags

NGSS.HS-PS1-4

A catalyst used during biochemical processes is known as a __________.

• antibody
• enzyme
• ion
• inorganic compound