Consider the reaction below Na 2 CO 3 (aq)+CaCl 2 (aq) CaCO 3 (s)+2NaCl(aq) if the releases 39.4 kJ of energy, how many kilocalories does it release ? (1cal = 4.184J) (Round off answer to 2 decimal place)

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

Aball with a mass of 275 g is dropped from rest, hits the floor and rebounds upward. if the ball hits the floor with a speed of 2.40 m/s and rebounds with a speed of 1.70 m/s, determine the following. (a) magnitude of the change in the ball's momentum (let up be in the positive direction.)

Apositive charge moves in the direction of an electric field. which of the following statements are true? check all that apply. check all that apply. 1.the potential energy associated with the charge decreases. 2. the electric field does positive work on the charge. 3. the electric field does negative work on the charge. 4. the potential energy associated with the charge increases. 5. the electric field does not do any work on the charge. 6. the amount of work done on the charge cannot be determined without additional information.