The temperature of 150 mL of water is 25°C. What must happen for the temperature of the water to increase to 35°C?
A. More water must be added to increase the thermal energy.
B. Thermal energy must be transferred from the water to decrease
the average kinetic energy of the water molecules.
C. Thermal energy must be transferred to the water to increase the
average kinetic energy of the water molecules.
D. Water must be removed to decrease the thermal energy.
SUBMIT

Identify arrows pointing to bonding electrons. done h-0-0-h ) intro

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Astudent pours 10.0 g of salt into a container of water and observes the amount of time it takes for the salt to dissolve. she then repeats the process using the same amounts of salt and water but this time she slowly stirs the mixture while it is dissolving. the student performs the experiment one more time but this time she stirs the mixture rapidly. the dependent variable in this experiment is: time for salt to dissolve speed of stirring amount of water mass of salt