Regents Review Set 3

A substance is classified as either an element or a

• compound
• solution
• heterogeneous mixture
• homogeneous mixture

Which phrase describes an atom?

• a negatively charged nucleus surrounded by positively charged protons
• a negatively charged nucleus surrounded by positively charged electrons
• a positively charged nucleus surrounded by negatively charged protons
• a positively charged nucleus surrounded by negatively charged electrons

Tags

NGSS.MS-PS1-1

Which particle diagram represents the arrangement of F₂ molecules in a sample of fluorine at 95 K and standard pressure?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-1

What occurs as two atoms of fluorine combine to become a molecule of fluorine?

• A bond is formed as energy is absorbed
• A bond is formed as energy is released.
• A bond is broken as energy is absorbed
• A bond is broken as energy is released

What is the coefficient of O₂ when the equation is completely balanced using the smallest whole-number coefficients?

• 13
• 14
• 19
• 26

Nuclei of U-238 atoms are

• stable and spontaneously absorb alpha particles
• stable and spontaneously emit alpha particles
• unstable and spontaneously absorb alpha particles
• unstable and spontaneously emit alpha particles

What is the total amount of heat required to vaporize 1.00 gram of H₂O(l) at 100^oC and 1 atmosphere?

• 4.18 J
• 334 J
• 373 J
• 2260 J

Which compound is soluble in water?

• PbS
• BaS
• Na₂S
• Fe₂S₃

What is required for a chemical reaction to occur?

• standard temperature and pressure
• a catalyst added to the reaction system
• effective collisions between reactant particles
• an equal number of moles of reactants and products

Tags

NGSS.HS-PS1-5

Which compounds yield hydrogen ions as the only positive ions in an aqueous solution?

• H₂CO₃ and HC₂H₃O₂
• H₂CO₃ and NaHCO₃
• NH₃ and HC₂H₃O₂
• NH₃ and NaHCO₃