Nature of Energy - Online Tutor, Practice Problems & Exam Prep

Typical energy values of carbohydrates, fats, and proteins are 4 kcal/g, 9 kcal/g, and 4 kcal/g, respectively. An adult was advised to commit to a 1550 kcal diet. If they stick to the plan instead of their current daily diet tabulated below, and a loss of 3500 kcal equals a loss of 1.0 lb, how many days (in 1 s.f.) will it take the adult to lose 11.0 lb?

Select the answer that best describes potential energy.

If the energy values of carbohydrate, fat, and protein are 17 kJ/g, 38 kJ/g, and 17 kJ/g, respectively, calculate the total kilojoules (rounded off to the tens place) in 2 tbsp of cheese spread containing 2 g of carbohydrate, 5 g of fat, and 3 g of protein.

Two cups of a pumpkin soup recipe contain 27 g, 11 g, and 9.5 g of carbohydrates, fat, and protein, respectively. Calculate the energy in kilocalories and kilojoules in the soup (energy values: carbohydrate = 4.0 kcal/g = 17.0 kJ/g, fat = 9.0 kcal/g = 38.0 kJ/g, and protein = 4.0 kcal/g = 17.0 kJ/g). Round off final answers to the tens place.

A type II diabetic patient was given 3.7 L of intravenous glucose solution. Calculate how many kilocalories can be obtained from the solution if it contains 2.5 g glucose or carbohydrate (energy value = 4.0 kcal/g) per 100. mL. 

True or False: Pushing a child on a swing describes potential energy.

The energy values of carbohydrates, fats, and proteins are 4 kcal/g, 9 kcal/g, and 4 kcal/g, respectively. If the recommended kilocalorie is 2000 kcal per day for someone trying to maintain their weight, will they be able to achieve this with the following daily diet?

Breakfast: 1 large egg (has 6 g of fat and 6 g of protein) and 1 baked potato (has 23 g of carbohydrate and 3 g of protein)

Lunch: 1 medium banana (has 26 g of carbohydrate and 1 g of protein), 1 cup of nonfat milk (has 12 g of carbohydrate and 9 g of protein), 3 oz ground beef (has 14 g of fat and 22 g of protein), and 3 oz broccoli (has 4 g of carbohydrate and 3 g of protein)

Dinner: 3 oz salmon (has 5 g of fat and 16 g protein) and 1 cup of carrots (has 11 g of carbohydrate and 2 g of protein)

Describe the changes in the potential and kinetic energy of a pendulum as it swings back and forth.

An adult weighing 60.0 kg consumes a boxed meal consisting of a steak and a baked potato. Given the table below, determine the number of hours of walking needed to burn off the kilocalories from the food set. The energy values of carbohydrates, fat, and protein are 4 kcal/g, 9 kcal/g, and 4 kcal/g, respectively, and walking expends 200 kcal/h.

One gram of propane (density = 0.493 g/mL) provides 12.0 kcal of energy. A propane clothes dryer requires 19000 kJ/h of energy to operate. How many hours can the dryer operate with 19.5 gallons of propane?

If the energy values of carbohydrate, fat, and protein are 4 kcal/g, 9 kcal/g, and 4 kcal/g, respectively, determine the grams (in 2 s.f.) of carbohydrate in a half medium-sized banana containing 55 kcal and 0.5 g of protein.

A person walked for a total of 9.5 hours and ran for 3.0 hours in one week. The person burns 120 kcal/h while walking and 580 kcal/hr while running. If a loss of 1.0 lb is equivalent to burning 3500 kcal, how many pounds did they lose?

Calculate the energy value (kcal/g) if the temperature of 380 g of water increased from 25.0 °C to 40.1 °C when 0.80 g of butter was burned in a calorimeter.  

The energy in food is reported in Calories where 1 Calorie = 1 kcal. A certain flavored granola bar contains 415 Calories. Calculate the energy in calories and in joules.

In the combustion of 1 mol of cyclohexanol, –828 kcal (–3464 kJ) of energy is released. The unbalanced reaction is as follows:

C₆H₁₁OH + O₂ → CO₂ + H₂O

Determine the combustion energy in kilocalories/milliliter and kilojoules/milliliter given that the density of cyclohexanol is 0.948 g/mL.

A person consumes a total of 1500 mL of soda per day. The soda contains 10.6 g of sugar (sucrose) per 100 mL of soda. Sucrose can provide 3.94 kcal/g of energy. Calculate the energy (kcal/day) that the person is getting from the sucrose in the soda. 

The activation energy of the forward direction for a certain reaction decreased from 57.3 kcal/mol to 34.1 kcal/mol upon the addition of a catalyst. How does the catalyst affect the reverse direction?

True or False: A catalyst is a substance that reduces the activation of the reaction, which, in turn, increases the products.

A cup of cooked oatmeal contains 158 Cal. Convert 158 Cal into J.

A 20.0-g block of aluminum at 110 °C and a 20.0-g block of gold at 10 °C are in contact with each other and isolated from the rest of the universe. Which statement applies for the final temperature of the blocks.