What is the answer to (2.0e3) (3.42e-2) with proper significant figures?

Name a less massive star that will become a giant and then white a white drawers

Which statement about the half life of a radioactive sample is true? a.) it is an exact measure of the decay of an individual atom. b.) it measures the tendency of a radioisotope to decay radioactively. c.

The atomic weight of silver is 107.868 amu. Naturally occurring silver consists of two isotopes. 107Ag (mass = 106.904 amu) and 109Ag (mass = 108.905 amu). What percentage of naturally occurring silver is the heavier isotope? a. 45.4% b. 52.6% c. 62.

We observe a distant object in space and see that the spectral lines for hydrogen in the object's light appear at a shorter wavelength than normal. What does this tell us about the object

How can the periodic table be used to predict bond types?

Two skydivers jump out of a plane. As the skydivers are in free fall, the potential energy they possessed at the airplane door Is being converted to kinetic energy True False

What part of an atom has no relative mass

A scientist studies the DNA of three different species. The DNA from species A is more similar to DNA from species B than DNA from species C. Which species are probably the most closely related? Explain your answer.

Gamma rays are waves of energy that have no charge. true false

Describe what a polar covalent bond is and name a common compound that has a polar covalent bond holding it together