The Chocolate Touch

A chocolate maker is going to stack two bars of chocolate. The bars of chocolate are the same size and have the same number of molecules. The diagram above shows the chocolate bars now, before they touch each other. Use the information in the diagram to answer the question. How does the temperature of the top chocolate bar compare with the temperature of the bottom chocolate bar now, and what will happen after the bars have been touching for a while?

• Before the bars touch, the two bars are different temperatures. Once the bars are touching, both kinetic energy and cold energy will transfer between the molecules in the two bars until both bars reach the same temperature, which will be in between their starting temperatures.

• Before the bars touch, the top bar is cooler than the bottom bar. Once the bars are touching, the bottom bar will transfer kinetic energy to the molecules in the cooler top bar until both bars reach the same temperature, which will be in between their starting temperatures.

• Before the bars touch, the top bar is hotter than the bottom bar. Once the bars are touching, the top bar will transfer kinetic energy to the molecules in the cooler bottom bar until both bars reach the same temperature, which will be in between their starting temperatures.

• Before the bars touch, the top bar is hotter than the bottom bar. Once the bars are touching, the cooler bottom bar will gain kinetic energy until the molecules of both bars have an energy of 25, because hotter things increase the temperature of cooler things.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

What is the primary ingredient in chocolate that affects the brain's chemistry?

• Caffeine

• Theobromine

• Serotonin

• Dopamine

Which process is used to separate cocoa solids from cocoa butter in chocolate production?

• Filtration

• Distillation

• Centrifugation

• Crystallization

What is the chemical formula for theobromine, a compound found in chocolate?

Tags

NGSS.MS-PS1-1

Which vitamin is known to be present in small amounts in chocolate?

• Vitamin A

• Vitamin B12

• Vitamin D

• Vitamin E

What is the effect of chocolate on blood pressure according to scientific studies?

• Increases blood pressure

• Decreases blood pressure

• No effect on blood pressure

• Varies depending on the type of chocolate

Which type of chocolate contains the highest amount of antioxidants?

• Milk chocolate

• Dark chocolate

• White chocolate

• Ruby chocolate

What is the role of lecithin in chocolate production?

• Sweetener

• Emulsifier

• Preservative

• Flavor enhancer

Which element is abundant in chocolate and is essential for muscle function?

• Calcium

• Iron

• Magnesium

• Potassium

What is the melting point range of cocoa butter, a key component of chocolate?

• 20-25°C

• 25-30°C

• 30-35°C

• 35-40°C

Tags

NGSS.MS-PS1-4