Which is colder dry ice or dioxide gas

For each of the following mixtures decide if filtering would be suitable to separate the substances. explain your answers. oil in water sugar in water sand in water chalk in water tea leaves in a cup of tea

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Ahydrogen atom has 1 electron. how many bonds can hydrogen form? a) 1 b) 2 c) 3 d) 4 e) 5