The greenhouse effect
a. is caused by pollution released into the atmosphere
b. does not occur naturally
c. is a naturally occurring process
d. needs to be reversed to save the planet

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

Asolution contains 180 g of glucose (c6h12o6) and 162 g of water. what is the mole fraction of glucose?