Which of the following combinations of reactants would have the fastest reaction rate?

• 
• 
• 
• 

Which two elements listed above would be malleable and have a high melting point?

• Elements W and X

• Elements W and Z

• Elements X and Y

• Elements Y and Z

Which of the following formulas accurately represents the product described above?

• Li₃P₃

• Li₃P

• LiP₃

• LiP

The final mass of the cold pack after it has been activated is

• half of the original mass

• equal to the original mass

• slightly less than the original mass

• slightly more than the original mass

Match the molecular models shown above with the compounds listed below:

_____ Ammonia, NH₃

_____ Ethane, C₂H₆

_____ Ethene, C₂H₄

_____ Methane, CH₄

• 1

  3

  4

  2

• 1

  4

  3

  2

• 1

  2

  3

  4

• 2

  3

  4

  1

If the teacher wanted to slow down the speed of this reaction, the next time the demonstration was carried out, the teacher would

• increase the initial hydrogen peroxide concentration

• increase the initial fluorescent dye concentration

• warm one of the initial reactants

• cool one of the initial reactants

The number of electrons in one beryllium atom is

• 9

• 5

• 4

• 2

Which of the following pairs of elements have the most properties in common?

• Fluorine and oxygen

• Fluorine and chlorine

• Sodium and neon

• Sodium and magnesium

The process of metal corrosion slows down if a metal is kept:

• dry and warm

• dry and cool

• wet and warm

• wet and cool

The melting of ice is considered a

• chemical change, because a new substance is formed

• physical change, because a new substance is formed

• chemical change, because the process is reversible

• physical change, because the process is reversible