In a chemistry experiment, the total energy contained in a system is 45 joules. After the system undergoes a chemical reaction, the total energy in the system is 39 joules. Which of the following statements is true?

A. The surroundings lost 6 joules.

B. The surroundings gained 6 joules.

C. The surroundings did not gain or lose any energy

D. This is impossible: a system cannot lose energy

Water molecules have a strong attraction to each other because of hydrogen bonding, allowing water to move against gravity up a plant's stem through capillary action. true false

For a patient with the following pes statement and interventions, which would be the most appropriate monitoring and evaluating data? pes statement: inadequate calcium intake related to food and nutrition related knowledge deficit as evidenced by statements that the only dietary source of calcium is milk and she believes that she is lactose intolerant. patient’s nutrition prescription is for a diet providing 1200 mg calcium per day. patient was provided with in-depth nutrition education on alternative dietary and supplement sources of calcium. a. calcium intake (at subsequent visit) b. knowledge assessment by asking patient to identify food sources from menus and shopping list (at the end of the current visit) c. serum calcium (at next visit) d. both a and b e. both a and c

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.