Welcome to Quiz #1 for TAKS 1_2A

1) What are the order of events in determining the melting point of water (ice) from the following list of events?
I. Record the temperature of the mixture.
II. Fill the beaker almost to the top of the ice with water.
III. Place ice in a beaker.
IV. Read the temperature when about half the ice has melted.

A) I, II, III, IV
B) III, II, I, IV
C) III, I, II, IV
D) III, II, IV, I

2) Baking soda was reacted with hydrochloric acid to produce carbon dioxide gas. Each trial was done at different conditions and the trials proceeded until 50.0 mL of carbon dioxide gas was produced.

Which two trials could be used to measure the effect of surface area on the reaction?

A) Trials 1 & 2
B) Trials 1 & 3
C) Trials 1 & 4
D) Trials 2 & 4

3) Baking soda was reacted with hydrochloric acid to produce carbon dioxide gas. Each trial was done at different conditions and the trials proceeded until 50.0 mL of carbon dioxide gas was produced.

Which two trials can be used to measure the effect of temperature on the reaction?

A) Trials 1 & 2
B) Trials 2 & 3
C) Trials 4 & 5
D) Trials 2 & 4

4) Baking soda was reacted with hydrochloric acid to produce carbon dioxide gas. Each trial was done at different conditions and the trials proceeded until 50.0 mL of carbon dioxide gas was produced.

In trials 2 and 3, what is the variable (independent variable) of the experiment?

A) Particle size
B) Amount of carbon dioxide gas produced
C) Temperature
D) Concentration of the hydrochloric acid

5) Baking soda was reacted with hydrochloric acid to produce carbon dioxide gas. Each trial was done at different conditions and the trials proceeded until 50.0 mL of carbon dioxide gas was produced.

Although not stated, what must be a controlled variable for this to be a valid set of data?

A) Time of day.
B) Always starting the clock when the second hand "hits" 12.
C) The container that the acid is stored in.
D) The amount of baking soda used.