Achemist mixes two liquids together. the reaction produces a gas and a solid. according to the law of conservation of mass, what should the chemist observe when she compares the total masses of the substances before and after the reaction? a. the masses are equal. b. the masses are inconsistent. c. the mass of the substances before the reaction is greater than the mass of the substances after the reaction. d. the mass of the substances before the reaction is less than the mass of the substances after the reaction.

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up?

98 points you will be galileo perform the experiment to determine if objects with different mass fall at the same, or different, rates in the air and in a vacuum. before you conduct your experiment, you need to form a hypothesis. a hypothesis is a prediction of what you think will happen in the experiment. the hypothesis is a statement that describes “if” a certain set of circumstances are present “then” there will be a specific result that will occur. record your hypothesis here: record the results from step one of the experiment (dropping the objects in the air): first trial: second trial: third trial: record the results from step two of the experiment (dropping the objects in a vacuum): first trial: second trial: third trial: did the experiment support your hypothesis? using the data from your experiment, describe why you believe your hypothesis was either proven or disproven. what forces were acting on the objects dropped in the air? what force was acting on the objects dropped in the vacuum? part two: comparing forces choose two forces and compare and contrast these forces. you must provide two ways that they are alike and two ways that they are different. you may make a list, write in paragraph form, or make a chart. choose two forces and compare and contrast these forces. these must be different forces than used in the prior question. provide two ways that they are similar and two ways that they are different. you may make a list, write it out, or make a chart.

How many valence electrons are in atom of radon?