Consider the following experiments, and answer the questions pertaining to classification: a. A pure substance R is heated, cooled, put under pressure, and exposed to light but does not change into anything else. What can be said about classifying substance R as an element or a compound? Explain your reasoning. b. Upon heating, solid pure substance T gives off a gas and leaves another solid behind. What can be said about classifying substance T as an element or compound? Explain your reasoning c. What can be said about classifying the solid left in part b as an element or compound? Explain your reasoning.
Consider the following experiments, and answer the questions pertaining to classification: a. A pure substance R is heated, cooled, put under pressure, and exposed to light but does not change into anything else. What can be said about classifying substance R as an element or a compound? Explain your reasoning. b. Upon heating, solid pure substance T gives off a gas and leaves another solid behind. What can be said about classifying substance T as an element or compound? Explain your reasoning c. What can be said about classifying the solid left in part b as an element or compound? Explain your reasoning.
Solution Summary: The author explains that the classification of pure substance R cannot be made due to lack of information.
Consider the following experiments, and answer the questions pertaining to classification:
a. A pure substance R is heated, cooled, put under pressure, and exposed to light but does not change into anything else. What can be said about classifying substance R as an element or a compound? Explain your reasoning.
b. Upon heating, solid pure substance T gives off a gas and leaves another solid behind. What can be said about classifying substance T as an element or compound? Explain your reasoning
c. What can be said about classifying the solid left in part b as an element or compound? Explain your reasoning.
Which of the following statements is(are) true?
a. A spoonful of sugar is a mixture.b. Only elements are pure substances.c. Air is a mixture of gases.d. Gasoline is a pure substance.e. Compounds can be broken down only by chemical means.
Indicate whether each of the following samples of matter is a heterogeneous mixture, a homogeneous mixture, a compound, or an element.
1. a blue-colored, single-phase liquid that when boiled away (evaporated) leaves behind a solid residue
a. heterogeneous mixture
b. element
c. compound
d. homogeneous mixture
2. a "cloudy" liquid that separates into two layers upon standing overnight
a. heterogeneous mixture
b. element
c. compound
d. homogeneous mixture
3. a nonuniform, white crystalline substance, part of which dissolves in alcohol and part of which does not dissolve in alcohol
a. heterogeneous mixture
b. element
c. compound
d. homogeneous mixture
4. a colorless gas that cannot be separated into simpler substances using physical means and that reacts with the metal
a. heterogeneous mixture
b. element
c. compound
d. homogeneous mixture
Match the correct word with the description.
v Blood is an example of
element.
A.
v Air is an example of
B. heterogeneous mixture.
- Nitrogen gas is an example of
C. compound.
Glucose (sugar) is an example
of
D. homogeneous mixture.
Chapter 1 Solutions
Chemistry for Today: General, Organic, and Biochemistry
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