Assignment 1A

(    /10 =     %)  

Type Your Name Here

Use the following information to answer the next 4 questions.  

Please enter your answers inside the symbols.

A student in a supervised laboratory performed an experiment based on the starting point activity on page 5 in the textbook.  The student was given one white powder, and some clear liquid, a film canister and a resealable plastic bag.  The student recorded the following results.

Appearance at Start of Activity

Appearance at End of Activity

Observations

White Powder

Clear Liquid

When the liquid was released from the container there was considerable bubbling and the bag became very warm.  Also the bag started to get bigger.  A greenish gas was observed in the bag.

 

  Clear Liquid

Clear Liquid

 

1. Why did the student have to put the liquid into the film canister?

A.  to keep it from evaporating
B.  to prevent light from hitting the liquid
C.  to prevent liquid from getting on the clothes
D.  to allow the bag to be sealed before mixing the chemicals

(   /1)

2. Why did the student open the film canister after the bag was sealed?

A.  to get the chemicals to mix
B.  to let light shine on the liquid
C.  to prevent a chemical reaction
D.  to allow the liquid and solid to be separated

(  /1)

3. What was the purpose of the resealable bag?

A.  to get the chemicals to mix
B.  to be able to see the reaction
C.  to prevent the products of the reaction from escaping
D.  to allow the liquid and solid to be separated long enough to be safe

(  /1)

4. Why did the bag get warm?

A.  the chemical reaction produced heat
B.  the student must have heated the bag
C.  the liquid reacted with the plastic bag
D.  heat is always produced when a solid and liquid are mixed

(  /1)

5. A person accidentally mixed some bleach with some vinegar.  A chemical reaction occurred and a dangerous gas was produced that required the person to be sent to the hospital for treatment.  What is the name of the toxic gas that was produced? (  /1 mark)

>

 

 

6. What is the definition of "chemical" as the term is used in this course? ( /1 mark)

>

 

 

7. A farmer is observed to be spraying a chemical onto a field.  When asked what he was spraying he replied that he was not spraying for weeds.  What was he most likely spraying to kill? ( /1 mark)

>

 

 

8. What kinds of chemicals should be stored out of the reach of children? ( /1 mark)

>

 

 

9. What kinds of containers should be stored away from heat? ( /1 mark)

>

 

 

10. What kinds of substances must be stored away from heat? ( /1 mark)

>