How many valence electrons do the inert gases have?

a. 1

c. 5

b. 4

d. 8

Greenhouse gases make up what percentage of Earth's atmosphere? A. less than 1% B. between 1% and 5% C. between 5% and 20% D. over 20%

Which of the following is not needed to make a model of the water cycle . an energy source . water . a closed container . a drain

How does a cell get the energy it needs to perform tasks? A) from electricity B) from food C) from atomic reactions D) from an organelle that produces energy

How can you make it clear that measured value of 980 in actually has 3 significant figures?

Why is photosynthesis a chemical change?

At a certain temperature this reaction follows first-order kinetics with a rate constant of 0.184 s^-1? Suppose a vessel contains Cl_2 O_5 at a concentration of 1.16 M. Calculate the concentration of Cl_2 O_5 in the vessel 5.70 seconds later.

When your heart doesn't know what it wants ... what do you do?

Cellulose, chitin, and peptidoglycan function as structural molecules and are extraordinarily resistant to degradation and decay. which structural feature is most directly responsible?

Which property of gases allows them to be stored at high concentrations in a bottle of air freshener?

The vapor pressure of 10 mL of ethanol at 20C is 5.85 kPa. What is the vapor pressure of 20 mL of ethanol at the same temperature?