Conservation of Mass - Combustion Mass (g) before burning Mass (g) after burning 76 64
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.
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.
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. Remember, the by-products of combustion include carbon dioxide and water vapor. These products escaped from the flask during combustion and the ending mass varied from the beginning mass.
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Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects
Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.
What is the percent composition of ca(oh)2? 37.7% ca, 53.0% o, and 10.3% h 45.5% ca, 38.2% o, and 16.3% h 54.0% ca, 43.0% o, and 2.7% h 64.7% ca, 27.0% o, and 8.3% h