1-4-1. What type of matter cannot be separated into two or more distinct components?
A. element, B. compound, C. mixture, D. pure substance
1-4-2. A naturally-occurring sample of matter most likely consists of...
A. a single element, B. a single compound
C. a mixture, D. a pure substance
1-4-3. A sample of matter is heated and found to start melting at 75.0oC. While melting, the sample temperature continues to rise to about 85.0oC. This matter is most likely...
A. an element, B. a compound, C. a mixture
1-4-4. Samples A, B, and C appear to be identical. Each sample is found to melt sharply at 122oC. However, a mixture of sample A and B is found to melt from 115-120oC, while a mixture of sample A and C is found to melt sharply at 122oC. Which of the following is true?
A. Samples A and B are composed of the same substance
B. Samples A and C are composed of the different substances
C. A mixture of B and C will have a sharp melting point
D. None of the above
