What happens when two or more atoms react?

What is the term for the outer electron shell of an atom? a. covalent b. ionic c. metallic d. valence

Students are studying how two substances react. The students mix substance 1 with substance 2 in a solution. Later the students boil the solution, releasing substance 1 as a gas and leaving substance 2 as a solid.

A chemical equation is shown: C2H4 + O2 → CO2 + H2O According to the law of conservation of mass, how many atoms of oxygen exist in the products of this reaction? 5 6 7 8

Which statement best describes the general relationship between stream velocity and the size of the sediment particles transported by the stream? 1. As the stream velocity decreases, the diameter of the sediments transported increases. 2.

Write the empirical formula of at least four binary compounds that could be formed from the following Mg2+ Pb4+ F- S2-

Occurs when the moon moves between the Earth and Sun and blocks the light

Why have some chemicals been banned from usage in agriculture/food production

Which of the following is a pure substance

What is 825640 in scientific notation

Which type of substance can conduct electricity in the liquid phase but not in the solid phase? metallic element molecular compound nonmetallic element ionic compound