This is a kind of electroscope student made in science class to study charges. Student Procedure:
-Tear off two pieces of tape, each 4 inches (10 cm) long.
-Press each piece firmly on the work table leaving one end of each tape piece sticking up as a handle.
-Quickly pull the tapes from the table and stick one piece on the arm of a straw in one film canister, and the
other piece on the arm of a straw in the other film canister.
-Move the canisters so the two pieces of tape are face to face, about 6 inches apart.
-Slowly move the canisters closer together.
This is a photograph of what occurred as the canisters were moved toward each other. Which of these conclusions is
NOT accurate
A)
The pieces of tape have like charges.
Eliminate
B)
The charged pieces of tape exert a force on each other.
Because the pieces of tape have like charges they will repel each other.
D)
The closer the canisters get, the less likely the pieces of tape will repel.

While studying chemical reactions and conservation of matter, sarah's class conducted a variety of experiments. sarah and her lab partner found the mass of a wax candle and placed the candle in a flask. the students lit the candle and let it burn to completion. all that was left was wax and charred candle wick. per their teacher's instructions, the students found the mass of the products. their data can be seen in the data table. formulate a hypothesis the students could test to explain why the experiment did not support the law of conservation of matter. a) the students could repeat the experiment using different candles; there might have been a flaw in the candle. b) the experiment should be repeatable. the students should run several trials and then take an average of the after mass in each trial. c) the students should have someone in the class check their measurement skills as they repeat the experiment. they may have made an error using the balance. d) the students should burn the candle in a container that has some type of lid so that any gas that is a product of the reaction can be contained and massed. submit