If the fundamental frequency of a certain string is 84 hz, what is the frequency of the second harmonic? 42 hz 84 hz 126 hz 168 hz

How can a substance gain energy and still be frozen

A 40-lb container of peat moss measures 14x20x30 in. a 40-lb container of topsoil has a volume of 1.9 gal. (a) calculate the average densities of peat mass and topsoil in units of g/cm3.

Which pair of elements form an ionic bond with each other? 1) KCI 2) ICI 3) PCI 4) HCI

Glass breaking is an example of: Chemical change Chemical properties Temperature change Physical change

What are the weakest attractions between molecules? a. ionic forces c. covalent forces b. Van der Waals forces d. hydrogen forces

Which of those molecules are polar. Co2, So2, CH2Cl2, PCl3

A chemical spill gets into the soil and effects the plants within a forested ecosystem. explain why the top predators would be most affected by this

If the heat released during condensation goes only to warming the iron block, what is the final temperature (in ∘C∘C) of the iron block? (Assume a constant enthalpy of vaporization for water of 44.0 kJ/molkJ/mol.)

Which of the following is not a disaccharide? A) sucrose B) maltose C) lactose D) amylose E) all of the above are disaccarides

The process by which a semipermeable membrane allows water molecules, small molecules, and ions to pass through while retaining large particles