When a system performs work on the surroundings, the work is reported with a negative sign.

What information is needed to write a correct chemical formula to represent an ionic compound?

Origin of name of aluminun

Brock brings a magnet near a metal object. A magnetic force acts on an object, pulling it upward. Which of the following best describes the magnetic force? A. a force that acts at a distance B. a gravitational foce C. a frictional force D.

Is layers of sediment forming at the bottom of the ocean erosion?

Select the correct answer. How does the structure of a carbon atom enable it to form large molecules? A. Each carbon atom can be stable with one, two, three, or four bonds because of how its valence electrons are arranged. B.

A mixture of two compounds, a and b, was separated by extraction. after the compounds were dried, their masses were found to be: 105 mg of compound a and 91 mg of compound b. both compounds were recrystallized and weighed again.

What are the five types of chemical reactions?

Which chemical reaction do plants use to take carbon dioxide out of the air

What are the primary elements of the earths layres?

How long does it usually take fir a rock to undergo a stage within the rock cycle