Which of the following elements can form double covalent bonds?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.