How many significant figures are in the result of the calculation below? (4.321 – 4.21) × (6.9234 × 105)

Which of the three major subatomic particles has/have a mass of approximately 1 amu?

A student finds that the mass of an empty beaker is 16.600 g. She places a solid in the beaker to give a combined mass of 16.629 g. To how many significant figures is the mass of the solid known?

Perform the following calculation and answer to the correct number of significant figures: (0.44 x 2.77) + 9 =

How many significant figures are in the number 6.002 × 105?

Which of the following is not what John Dalton stated in his atomic theory?

The product of (1.400 × 10-1)(6.02 × 1023) will have how many significant figures?

Round off the following to three significant figures: 0.032000000 cg

A graduated cylinder contains 20.0 mL of water. An irregularly shaped object is placed in the cylinder, and the water level rises to the 31.2 mL mark. If the object has a mass of 63.1 g, what is its density?

Perform the following calculation and answer to the correct number of significant figures:             4.50 km x 12.5 km x 22 km