How are the dark reactions that occur in plants dependent on the light reactions? a.
The chemical energy used in the dark reactions is produced in the light reactions.
b.
The light reactions produce the oxygen necessary for the dark reactions to proceed.
c.
Light energy absorbed during the light reactions is used directly in the dark reactions.
d.
During the light reactions, carbon dioxide is converted to sugars, which are used during the dark reactions.

Which of the following best explains why the end of a spoon sticking out of a cup of hot water also gets hot? question 7 options: the heat from the hot water is conducted through the spoon handle the hot water heats the air surrounding the upper part of the spoon. the hot water causes a physical change in the spoon handle. the hot water causes a chemical reaction to take place in the spoon.

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-