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Using the rules of significant figures, calculate the following:         5.374  + 4.1  + 6 =

The number 0.001 expressed in exponential notation is

Convert 77.0°F into Celsius degrees?

Convert 786.5 mi to kilometers (1 m = 1.094 yd; 1 mi = 1760. yd).

Using the rules of significant figures, calculate the following: 30 + 4.207

Write the following number into scientific notation? 0.0000017

How would you classify propane?

How would you classify methane? 

Which of the following describes a chemical element?

Which of the following is a homogeneous / pure substance / compound?