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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?

Which of the following numbers are correctly expressed in both exponential notation and ordinary decimal form? i. 4.09 x 10-3 = 4090 ii. 3.72 x 10-5 = 0.0000372 iii. 62,800 = 6.28 x 104 iv. 5,910,000 = 5.91 x 10-6

What is a lead magnet?