حلوى صخرة بلورات السكر

زراعة بلورات سكر صالحة للأكل على خيط

Crystallization Beginner (Middle School) 25 دقيقة ~$4,00

الهدف

زراعة بلورات سكر (سكروز) كبيرة على خيط لصنع حلوى الصخر، مما يوضح التشبع الفائق والتنوية مع منتج صالح للأكل.

الخلفية

Rock candy is made by suspending a string in a supersaturated sugar solution and waiting for crystals to grow. Sugar is unusual in that it is extremely soluble in water (about 2 kg per liter at 100°C) and forms large monoclinic crystals with well-defined facets.

تحذيرات السلامة

  • Sugar syrup is extremely hot — burns risk
  • Supervise children during the boiling step

معدات الوقاية الشخصية المطلوبة

goggles

المواد

  • Granulated sugar (500 g)
    White sugar
  • Water (200 mL)
  • Cotton string (30 cm)
    Unbleached
  • Food coloring (5 drops)
    Optional
  • Flavoring extract (1 tsp)
    Optional

المعدات

Saucepan Stove or hot plate Tall glass jar Pencil Clothespin

الإجراء

1

Heat 200 mL water to boiling in the saucepan. Gradually dissolve 400-500 g sugar, stirring continuously.

10 دقيقة Hot syrup — burns risk
2

Remove from heat. Add food coloring and flavoring if desired.

2 دقيقة
3

Wet the cotton string with water and roll in granulated sugar to create nucleation sites. Let dry for a few hours.

3 دقيقة
4

Pour the cooled (but still warm) sugar solution into the glass jar.

2 دقيقة
5

Suspend the prepared string from a pencil across the top of the jar so it hangs in the solution without touching the sides or bottom.

3 دقيقة
6

Cover loosely and place in a stable location. Check daily for 5-7 days. Crystals should grow along the string.

5 دقيقة

النتائج المتوقعة

After 5-7 days, large sugar crystals (1-3 cm) should form along the string, creating rock candy. Crystals are monoclinic with flat, angled faces. The result is edible.

التنظيف

Excess sugar solution can be reheated and reused. Wash all equipment with warm water.

Frequently Asked Questions

What is the objective of حلوى صخرة بلورات السكر?
زراعة بلورات سكر (سكروز) كبيرة على خيط لصنع حلوى الصخر، مما يوضح التشبع الفائق والتنوية مع منتج صالح للأكل.
How difficult is حلوى صخرة بلورات السكر?
This experiment is rated as Beginner (Middle School). It takes approximately 25 minutes to complete.
What safety precautions are needed for حلوى صخرة بلورات السكر?
Key safety precautions include: Sugar syrup is extremely hot — burns risk; Supervise children during the boiling step.
What materials are needed for حلوى صخرة بلورات السكر?
The main materials required are: Granulated sugar, Water, Cotton string, Food coloring, Flavoring extract.
What results should I expect from حلوى صخرة بلورات السكر?
After 5-7 days, large sugar crystals (1-3 cm) should form along the string, creating rock candy. Crystals are monoclinic with flat, angled faces. The result is edible.