Creating Rock Candy Crystals: A DIY Science Exploration

Cristian Pinedo introduces a STEM activity to make rock candy crystals at home. The video guides viewers through gathering supplies, preparing a sugar solution, creating seed crystals, and growing the crystals over several days. It explains the chemistry of solubility and supersaturation, encouraging viewers to experiment and share their results.

What is the main purpose of the video tutorial?

• To demonstrate various cooking techniques

• To explain the history of rock candy

• To teach how to make rock candy crystals at home

• To discuss the nutritional benefits of sugar

Tags

CCSS.RI.7.7

CCSS.RI.8.7

CCSS.RI.9-10.7

CCSS.RL.7.7

CCSS.RL.9-10.7

Which of the following is NOT mentioned as a supply needed for making rock candy crystals?

• A small pot

• A thermometer

• Skewers

• Three cups of sugar

What is the purpose of heating the sugar solution on the stove?

• To evaporate the water

• To sterilize the solution

• To dissolve the sugar into the water

• To make the solution more colorful

Why do we dip the skewer in the sugar solution and then roll it in sugar?

• To make the skewer more colorful

• To clean the skewer

• To create seed crystals for the rock candy

• To add flavor to the skewer

How long can the process of growing rock candy crystals take?

• 1 to 2 days

• 4 to 10 days

• 1 month

• 2 to 3 weeks

What happens to the sugar solution as it cools?

• It evaporates completely

• It becomes more liquid

• It forms sugar crystals

• It changes color

What property of liquids is discussed in the chemistry explanation?

• Viscosity

• Conductivity

• Density

• Solubility

What effect does adding heat have on the solubility of sugar in water?

• It increases solubility

• It has no effect

• It makes the solution cloudy

• It decreases solubility

What is a supersaturated solution?

• A solution that can dissolve more solute than usual at a given temperature

• A solution that is less dense than water

• A solution with no dissolved substances

• A solution that changes color when heated

Why do sugar molecules stick to the seed crystals?

• Because of the temperature

• Because they are attracted to other sugar molecules

• Because of the flavoring

• Because of their color