Classify each of the following changes as chemical or physical: crushing physical rock adding antifreeze to a car radiator scorching butter chemical physical

You lose 5 pounds over a 30-day period. Which of the following quantities act like astate function: the amount of calories you consume, your weight, or the number ofcalories burned through exercise?

When 56 J of heat are added to 11 g of a liquid, its temperaturerises from 10.4oC to 12.7oC. What is the heat capacityof the liquid?

not sure which way the arrows go on the right where it says " (s) -> (g) ↑?↓Ech " "takes:↑?↓T    ↑?↓P"

137 kJ to Calories.

Which has the greater kinetic energy, Object 1 with a mass of 2.9 kg and a velocity of 0.71 m/s or Object 2 with a mass of 1.3 kg and a velocity of 2.2 m/s? KE of Object 1 = J KE of Object 2 =| J |has greater kinetic energy. Object 1 Object 2 Retny Entire Groun O more aroun attempts remaining

5 ✓7 D ✔B ✓9 ✓ 10 ✓11 12 The human body burns glucose (C,H,O,) for energy according to this chemical reaction: CH₁₂0+60-6CO₂ + 6H₂0 The products of the reaction are carbon dioxide (CO₂) and water (H₂O). Interestingly, all of the carbon dioxide and much of the water exits the body through the lungs: on every breath, the average person exhales 500 ml. of air, which is typically enriched to 4% CO, and 5% water vapor by volume. In short, when a person loses weight by dieting, the weight that is lost actually departs his body as a gas, every time he exhales. Each kilogram of body fat lost requires exhaling about 2.8 kg of carbon dioxide. Calculate how many breaths it takes an average person to "exhale" 3.00 kg of fat. Round your answer to the nearest thousand. You'll need to know that the density of CO₂ is 2.0 kg/m³. 10 13 ? D

How many kilocalories did the patient obtain from the lunch? Express the energy as an integer and include the appropriate units

Consider the two spheres shown here, one made of silver andthe other of aluminum. (a) What is the mass of each spherein kg? (b) The force of gravity acting on an object is F = mg,where m is the mass of an object and g is the acceleration ofgravity (9.8 m/s2). How much work do you do on each sphereit you raise it from the floor to a height of 2.2 m? (c) Does theact of lifting the sphere off the ground increase the potentialenergy of the aluminum sphere by a larger, smaller, orsame amount as the silver sphere? (d) If you release thespheres simultaneously, they will have the same velocitywhen they hit the ground. Will they have the same kineticenergy? If not, which sphere will have more kinetic energy?[Section 1.4]

Classify the following processes as exothermic or endother-mic: (a) freezing of water; (b) boiling of water; (c) digestion offood; (d) a person running; (e) a person growing; (f) wood being chopped; (g) heating with a furnace.