Unit 2 Assessment 3 Practice

Identifying Chemical Reactions

100

Reactant breaks down into simpler products

Decomposition

200

When a reaction releases energy, it is called...

A. Exothermic

B. Endothermic

C. Allothermic

A. Exothermic

300

What type of chemical reaction is taking place?

2H₂ + O₂ -> 2H₂O

Synthesis

400

What type of chemical reaction is taking place?

2KI + Pb(NO₃)₂ -> PbI₂ + 2KNO₃

Double replacement

500

What type of chemical reaction is taking place?

K + NaCl -> KCl + Na

Single replacement

Balancing Chemical Reactions

100

What is the missing coefficient:

____ NO + O₂ -> 2NO₂

2

200

What is the missing coefficient:

2Fe(OH)₃ -> Fe₂O₃ + ___H₂O

3

300

What is the missing coefficient:

Cl₂ + ____NaBr -> 2NaCl + Br₂

2

400

What are the missing coefficients:

2K + ___H₂O -> ____KOH + H₂

2, 2

500

What are the missing coefficients:

2Fe₂O₃ + 3C -> ____Fe + ____CO₂

4, 3

Acids, Bases and the pH Scale

100

What type of substance would feel slippery and taste bitter?

A. Acids

B. Bases

C. Neutral substances

B. Bases

200

Lemon juice is an example of a/an...

A. Acid

B. Base

C. Neutral substance

A. Acid

300

A substance that is rated a 7 on the pH scale would be considered...

A. Acidic

B. Basic

C. Neutral

C. Neutral

400

What pH indicator turns red for acids and greenish/yellow for bases

A. Litmus paper

B. Phenolphthalein

C. Red Cabbage Juice

C. Red Cabbage Juice

500

Which of the following reacts with metals to form hydrogen gas?

A. Acids

B. Bases

C. Neutral materials 

A. Acids

Nuclear Reactions and Decay

100

What type of radioactive particle can penetrate all substance besides lead and concrete

Gamma

200

What type of radiactive particle can penetrate paper, but not tin foil?

Beta particles

300

What type of radioactive particles is composed on an electron?

Beta particles

400

What type of nuclear energy is used by the Sun?

Nuclear Fusion

500

What is the half-life of a substance that has a parent cell with only 25% of the original particles after 50 years (75% are in the daughter cell)

25 years

Magnetism and Electricity

100

Which of the following would be attracted to each other?

A. 2 North poles on a magnet

B. 2 South poles on a magnet

C. 1 North pole and 1 South pole

C. 1 North pole and 1 South pole

200

True or False: Changing electric fields creates a magnetic field but a changing magnetic field will not create an electric field

False

300

What type of circuit would be better to use in a house?

Parallel

400

Which of the following would make magnetism stronger?

A. Electrons spin in the same direction

B. Electrons spin in opposite directions

A. Electrons spin in the same direction

500

How much current is in a circuit that includes a 8-volt battery and a bulb with a resistance of 2 ohms?

4 amps