Arjun has a 12 g gold ring that is initially at 45°C. He cools it down to 15°C, and the amount of heat energy released is -47 J. What is the specific heat capacity of gold?

Ethan and Aiden were conducting a chemistry experiment, and they noticed that the beaker felt warm to the touch. They concluded that in an exothermic process, the system loses heat. Is their conclusion correct?

Anika, Avery, and Mason are discussing the combustion of gasoline in a car engine. Is this process endothermic or exothermic?

Abigail and Samuel are studying a chemical reaction in their chemistry class. They learn that when nitrogen and hydrogen react, ammonia is produced along with energy. The balanced equation for the reaction is:
2N₂ + 3H₂ --> 2NH₃ + 46 kJ
Nora wonders how much energy would be produced if only 1 mol of nitrogen was reacted in this process. Can you help her find the answer?

Kai is working on a science project where he needs to produce 4.75 mol of gaseous water from liquid water. If the reaction requires 44.0 kJ of energy to produce 1 mol of gaseous water, how much energy does Kai need to use for his project?
H₂O (l) +  44.0 kJ --> H₂O (g)

Anika wants to convert food calories to chemistry calories. If she has 1 food calorie, how many chemistry calories does it equal?

Maya has a copper bracelet with a specific heat(c) of 0.39 J/g °C. During a science experiment, Grace adds 100 Joules of heat(Q) to the 20 grams bracelet. What would be the temperature change(∆T) of the bracelet?

Rohan, Luna, and Benjamin were conducting a chemistry experiment in their school lab. They mixed H₂, 2 C, and N₂ and observed that the reaction absorbed 270.3 kJ of energy. They were curious to know whether the reaction they conducted was endothermic or exothermic. Can you help them?

David was baking a pie and used a 10 g piece of aluminum foil. The specific heat of aluminum is 0.21 J/g°C. After baking, he took the foil out of the oven which was at 100° and let it cool down to 50°. Mia and Benjamin are curious to know how much heat(Q) was released by the foil during this process.

Grace, Zoe, and Elijah were conducting a science experiment. They heated 20 g of water. The specific heat of water is 4.18 J/g°C. They noticed the temperature changed from 25° C to 20° C. They wondered, how much heat energy (q) moved from the water to the surroundings during their experiment?