Calculate the atomic mass for zinc given the following data for its natural isotopes:

64Zn 63.929 amu 48.89 %

66Zn 65.926 amu 27.81 %

67Zn 66.927 amu 4.11 %

68Zn 67.925 amu 18.57 %

70Zn 69.925 amu 0.62 %

Which metal reacts quickly with cold water only when it is finely powdered? A) calcium B) copper C) sodium S) magnesium

Which statement best describes London dispersion forces? A. repulsive intramolecular forces B. attractive intramolecular forces C. repulsive intermolecular forces D. attractive intermolecular forces

In the reaction of magnesium with oxygen gas, a considerable amount of energy was released. This is an example of an exothermic reaction.

What happens if billy could throw the rock as fast as a rocket

Why does a 100 gram piece of wood float but a 100 gram piece of metal sink

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

Ice melting, water boiling, lighting a match, grape juice freezing. Which statement describes evidence of a chemical reaction