Mystery Substance

Which words in paragraph 2 help the reader understand the meaning of the word combine?

• get a treat

• put them together

• different substances

• unmarked containers

In paragraph 8, what does the word thermometer mean?

• device that measures weight

• device that measures volume

• device that measures mass

• device that measures temperature

What is the reddish powder?

• iron

• sugar

• sand

• drink mix

Why does Juan think that the first mystery substance is salt?

• It is white and grainy.

• It is white and fluffy.

• It tastes like salt.

• It smells like salt.

Why does Mr. Chu make Juan taste the mystery substance?

• Mr. Chu wants to make Juan sick.

• Mr. Chu wants to play a joke.

• Mr. Chu wants Juan to fail.

• Mr. Chu wants to know if the substance is right.

When Juan tastes the mystery substance, he feels:

• surprised

• sick

• annoyed

• proud

What is the first step in the lab?

• weigh something

• pour something

• taste something

• mix something

After Juan mixes the three substances together, he:

• heats the product

• cools the product

• freezes the product

• spills the product

Look at table about the mystery substances. Which choice belongs in the empty box of the table?

• Flour

• Baking Soda

• Sugar

• Zinc

Which detail from the story supports Juan’s conclusion that the clear liquid is rubbing alcohol?

• Mr. Chu told Juan to take a sip of his mystery substance.

• The mystery substance tasted good!

• The final product was a red liquid.

• The class often used alcohol in labs.