Chemistry, 28.08.2019 22:50 jackie6852

Lee conducts an experiment to see if mass is conserved when a piece of charcoal is burned for 5.0 minutes. he measures the mass of the charcoal before lighting it with a match. at the end of 5.0 minutes, lee puts out the fire by suffocating it. after the charcoal has cooled, he measures its mass again. his data are below.
initial mass | final mass
.415 | .289
charlene tries to repeat lee's experiment by using a different piece of charcoal. but she burns the charcoal for just 3.0 minutes and collects all of the gas and dust released by the burning charcoal. she then weighs the total mass of these objects. her results are below.
initial mass | final mass
.498 | .498
charlene's experimental results indicate that mass was conserved. why do lee's results indicate that mass was not conserved?
he burned the charcoal for a longer period of time than charlene did.
he did not collect the gas and dust released by the burning charcoal.
he forgot to measure the mass of the charcoal while it was still burning.
mass is not conserved when an object undergoes a chemical change.

Answers: 1

Show answers

Another question on Chemistry

Chemistry, 21.06.2019 21:10

How is 0.00235 expressed in proper scientific notation? a. 2.35 × 10-3 b. 0.235 × 10-2 c. 2.35 d. 2.35 × 103

Answers: 1

Answer

Chemistry, 22.06.2019 06:00

In an investigation that uses the scientific method, which step immediately follows making a hypothesis? o summarizing the results o asking a question o making observations designing an experiment mark this and retum save and exit next submit

Answers: 2

Answer

Chemistry, 22.06.2019 12:30

The element that has the greatest electronegativity is

Answers: 1

Answer

Chemistry, 22.06.2019 15:10

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?

Answers: 2

Answer

You know the right answer?

Lee conducts an experiment to see if mass is conserved when a piece of charcoal is burned for 5.0 mi...

Questions