3 Chemical Reaction Types and Their Equations lab PDF

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Grading Summary These are the automatically computed results of your exam. Grades for essay questions, and comments from your instructor, are

Date Taken:

2/22/2012

Time Spent:

01 min , 01 secs

Points Received:

10 / 10 (100%)

in the "Details" section below. Question Type:

# Of Questions:

Multiple Choice

10

# Correct: 10

Grade Details 1. Question : In Procedure 1, what is the mass of the unknown product after heating?

Student Answer:

3.316 g

33.16 g

.3316 g

31.36 g

Points Received:

1 of 1

Comments:

2. Question : In Procedure 1, what is the change in mass?

Student Answer:

11.316 g

1.316 g

13.16 g

.1316 g

Points Received:

1 of 1

Comments:

3. Question : Where did the extra mass come from?

Student Answer:

The magnesium

The oxygen

The hydrogen

The hydroxide

Points Received:

1 of 1

Comments:

4. Question : What is the balanced reaction for the synthesis reaction in procedure 1?

Student Answer:

Mg+ O yields MgO

Mg+ O yields MgO2

2Mg+ O2 yields 2MgO

4Mg+ O yields MgO

Points Received:

1 of 1

Comments:

5. Question : What is a hydrate?

Student Answer:

It is a chemical compound that has water molecules bound loosely to it by electrostatic forces. It is a chemical compound that has hydrogen and magnesium ions attached to it. It is a physical mixture that has water molecules bound tightly to it by electrostatic forces. It is a physical mixture that has hydrogen and magnesium ions attached to it.

Points Received: Comments:

1 of 1

6. Question : What is the molecular weight of CuCO3(OH)2?

Student Answer:

221.116 g/mol

22.116 g/mol

.2216 g/mol

2.216 g/mol

Points Received:

1 of 1

Comments:

7. Question : For Procedure 3, if you could open the piston slightly and place a burning splint into it, you would hear a “pop.” What gas would do this?

Student Answer:

Oxygen gas

Hydrogen gas

Argon gas

Neon gas

Points Received: Comments:

1 of 1

8. Question : What ions are present in an aqueous solution of NaOH?

Student Answer:

Na+ OH-

Na- OH+

O- H-

Na- O-

Points Received:

1 of 1

Comments:

9. Question : What is a complete balanced equation for the double displacement reaction in Procedure 4?

Student Answer:

NiCl2+2NaOH yields Ni(OH)2+ 2NaCl

NiCl+ NaOH yields NiOH+ NaCl

4NiCl+ NaO yields NiO+Na

2NiCl+NaOH yields NiOH+NaCl

Points Received:

1 of 1

Comments:

10. Question : What ions are present in an aqueous solution of NiCl2?

Student Answer:

Ni+ Cl-

Ni- Cl+

Ni+ Cl+

Ni- Cl-

Points Received:

1 of 1

Comments:

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