3. When atoms combine to form molecules, a (blank) change has occurred.

How does the surface metabolism model of chemical evolution differ from the prebiotic soup model? see section 2.4 (page 70) ?

Explain in detail what causes tides and give one reason why it is important for humans to monitor tides.

The amount of order in an isolated system cannot increase; it may only stay the same or decrease. This expresses which of the following?

What type of bond is formed when an atom of potassium transfers an electron to a bromine atom?

In a coffee-cup calorimeter, 50.0ml of 0.100M AgNO3 and50.0ml of 0.100M HCl are mixed to yield the following reaction: Ag + (aq) + Cl - (ag) >AgCl (s) The two solutions were initially at 22.60oC, and the final temperature is 23.40oC.

How do chemists know that an oxygen molecule have unpaired electrons?

How is firelight produced

Systems in nature tend to undergo changes toward (1) lower energy and less disorder (2) lower energy and more disorder (3) higher energy and less disorder (4) higher energy and more disorder

Which of the following pairs does not share the same empirical formula? 1) CH2O and C3H6O3 2) PbCl2 and PbCl4 3) NO2 and N2O4 4) C3H12 and CH4

Which subatomic particle is the lightest? (a) neutron (b) proton (c) electron (d) all of the above (obviously not the last one, I guess)