Physics

Physics, 31.07.2019 01:00, samiyahbass

Ascientist is performing and experiment on a powder . which is the following sign that a chemical change has definitely occurred during his experiment? a. the powder catches on fire b. the powder release bubbles c. the powder heats up d. the powder breaks apart into smaller particles

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Physics, 16.07.2019 00:00, bestielove7425

Ascientist compares two samples of white powder. one powder was present at the beginning of an experiment. the other powder was present at the end. she wants to determine whether a chemical reaction has occurred. she finds that neither sample bubbles or dissolves in water. she measures the mass and volume of the solids. sample one has a volume of 45 cm3 and a mass of 0.5 g. sample two has a volume of 65 cm3 and a mass of 1.3 g. what should the scientist conclude? a)the samples have the same color, so no chemical reaction has occurred. b)the two samples do not react with water, so no chemical reaction has occurred. c)the densities of the samples are different, so a chemical reaction has occurred. d)the densities of the samples are the same, so no chemical reaction has occurred. e)the densities of the samples are different, so no chemical reaction has occurred.

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Physics, 28.08.2019 11:50, tdyson3p6xvtu

Ascientist is performing an experiment on a powder. which of the following is a sign that a chemical change has definitely occurred during his experiment? the powder catches on fire. the powder releases bubbles. the powder heats up. the powder breaks apart into smaller particles.

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Chemistry, 29.08.2019 14:10, bailey1025

Ascientist is performing an experiment on a powder. which of the following is a sign that a chemical change has definitely occurred during his experiment? the powder catches on fire. the powder releases bubbles. the powder heats up. the powder breaks apart into smaller particles.

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Biology, 22.09.2019 15:50, dmfraley01

Ascientist is performing an experiment on a powder. which of the following is a sign that a chemical change has definitely occurred during his experiment? the powder catches on fire the powder bubbles the power heats up the powder brakes into small particles

Answers: 1

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