What question can a student BEST answer when comparing and contrasting the models? A. How does the phase of matter affect the temperature of a substance? B. How does each model affect the temperature of a substance? C. How does temperature affect the rate of reaction of a substance? D. How does temperature affect the phase of matter of a substance?

Y=‐1x + 7 if y has a value of ‐24 what is the value of x?

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

What is the enthalpy of combustion (per mole) of c4h10 (g)? –2,657.5 kj/mol –5315.0 kj/mol –509.7 kj/mol –254.8 kj/mol