PLEASE HELP I got this wrong on an exam but got it wrong and i don’t know why! Which of the following four measurements has the smallest uncertainty percentage?

A 9,99 cm +/- 0,005 cm
B 4,44 cm +/- 0,005 cm
C 1,11 cm +/- 0,005 cm
D 5,55 cm +/- 0,005 cm

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.

Amixture that has two or more substances that are spread out evenly is called a. compound b. heterogeneous c. substance d. homogeneous

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