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 density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then cooled in the refrigerator. At 10.0 °C crystals begin to appear until the liquid is about half crystal, half liquid. After 30 minutes, no more crystals appear, even though the temperature is lowered to 6.3 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. mg of the powder are put into a very thin tube and heated. The powder begins melting at 66.2 °C. The temperature stays constant as the powder slowly melts. After the last of the powder melts, the temperature starts to rise again, eventually reaching 76.0 °C. pure substance Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of mixture the experiment isn't enough to decide, choose "can't decide." O (can't decide) pure substance Is sample B made from a pure substance or a mixture? If the description of the substance and the outcome of mixture the experiment isn't enough to decide, choose "can't decide." O (can't decide)
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 density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is then cooled in the refrigerator. At 10.0 °C crystals begin to appear until the liquid is about half crystal, half liquid. After 30 minutes, no more crystals appear, even though the temperature is lowered to 6.3 °C. • Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. mg of the powder are put into a very thin tube and heated. The powder begins melting at 66.2 °C. The temperature stays constant as the powder slowly melts. After the last of the powder melts, the temperature starts to rise again, eventually reaching 76.0 °C. pure substance Is sample A made from a pure substance or a mixture? If the description of the substance and the outcome of mixture the experiment isn't enough to decide, choose "can't decide." O (can't decide) pure substance Is sample B made from a pure substance or a mixture? If the description of the substance and the outcome of mixture the experiment isn't enough to decide, choose "can't decide." O (can't decide)
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
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.
Question
Transcribed Image Text: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 density of the liquid is measured, and turns out to be 0.77 g/mL. The liquid is
then cooled in the refrigerator. At 10.0 °C crystals begin to appear until the liquid is about half crystal, half liquid. After 30
minutes, no more crystals appear, even though the temperature is lowered to 6.3 °C.
• Sample B is 100. g of a coarse grey powder with a faint unpleasant smell. 15. mg of the powder are put into a very thin
tube and heated. The powder begins melting at 66.2 °C. The temperature stays constant as the powder slowly melts. After
the last of the powder melts, the temperature starts to rise again, eventually reaching 76.0 °C.
Is sample A made from a pure substance or a mixture?
O pure substance
?
If the description of the substance and the outcome of
the experiment isn't enough to decide, choose "can't
decide."
mixture
O (can't decide)
Is sample B made from a pure substance or a mixture?
O pure substance
If the description of the substance and the outcome of
the experiment isn't enough to decide, choose "can't
decide."
mixture
O (can't decide)
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