Distinguishing mixtures from pure substances through physical... Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils, which starts to happen at 66.2 °C. As the liquid boils, the temperature continues to rise, until the last of the liquid boils away at 76.0 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. Most of the powder disappears, but of a gritty black sand-like material is left on the surface of the paper. Pouring more water over the black material doesn't change how much of it there is. Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." Is sample B made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." Explanation Recheck pure substance. mixture. (can't decide) Opure substance mixture. O (can't decide) X
Distinguishing mixtures from pure substances through physical... Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure substance or a mixture, if you can. • Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils, which starts to happen at 66.2 °C. As the liquid boils, the temperature continues to rise, until the last of the liquid boils away at 76.0 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper. Distilled water is poured slowly over the powder. Most of the powder disappears, but of a gritty black sand-like material is left on the surface of the paper. Pouring more water over the black material doesn't change how much of it there is. Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." Is sample B made from a pure substance or a mixture? If the description of the substance and the outcome of the experiment isn't enough to decide, choose "can't decide." Explanation Recheck pure substance. mixture. (can't decide) Opure substance mixture. O (can't decide) X
Chemistry
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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
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Distinguishing mixtures from pure substances through physical...
Is sample A made from a pure substance or a mixture?
If the description of the substance and the outcome of
the experiment isn't enough to decide, choose "can't.
decide."
Explanation.
Is sample B made from a pure substance or a mixture?
If the description of the substance and the outcome of
the experiment isn't enough to decide, choose "can't
decide."
2
Recheck
G
W
General Chemistry I
Read the descriptions below of two substances and an experiment on each. Decide whether the result of the experiment tells you the substance is a pure
substance or a mixture, if you can.
B
• Sample A is 100. mL of a clear liquid. The liquid is heated in a flask until it boils, which starts to happen at 66.2 °C. As the liquid boils, the temperature
continues to rise, until the last of the liquid boils away at 76.0 °C.
3
.
• Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. g of the powder is put into a funnel lined with a sheet of thick paper.
Distilled water is poured slowly over the powder. Most of the powder disappears, but of a gritty black sand-like material is left on the surface of the paper.
Pouring more water over the black material doesn't change how much of it there is.
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