A pound is approximately 0.45 kilogram. A person weighs 87 kilograms. What is the persons weight, in pounds, when expressed to the correct number of significant figures.

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

The atoms of a solid aluminum can are close together, vibrating in a rigid structure. if the can is warmed up on a hot plate, what happens to the atoms?

What is the chemical formula for the compound formed between sodium and flour one