Which of the following cannot be determined from the spectrum of a star?

For each example of a phase change, identify whether heat is absorbed from the surroundings or released into the surroundings. A popsicle melts on a hot day. Rubbing alcohol evaporates from the surface of the skin.

The octet rule pertains to: a. only the noble gases. b. only groups 1A and 2A. c. elements in Groups 1A - 7A. d. all elements in the periodic table.

What change into velocity

What are the reactants in burning waste? What products are obtained from burning waste?

Chemical properties of matter depend mostly on A. the shape and size of the substance. B. the color of the substance. C. the types of atoms and bonds that a substance contains. D. the substance's state of matter.

Which of the following IS a valid piece scientific evidence?

How are the input and output forces of the parts of a complex machine related?

Which would most likely be done while designing a solution? researching the current uses of a fuel type sketching a diagram of a new medical device reporting the results of using a prototype redesigning a model airplane that did not fly well

A sample of Xe takes 75 seconds to effuse out of a container. An unknown gas takes 60 seconds to effuse out of the identical container under identical conditions.

D a distinct pattern in the elements and proposed the law of octaves. What were his conclusions?