VIRTUAL CHEMISTRY LAB

SOUR FOODS

Question: What atoms are in sour foods?

Hypothesis:

Sour foods contain high concentration of loose hydrogen atoms.

Procedures: Number the cups up to 5, add 5 drops of food to each numbered cups, add 1 drop of dye to all the cups, put cups in order according to the color chart.

Data:

The color of the dye shows the concentrate of loose hydrogen atoms in the food. Pink has the highest concentration of loose hydrogen atoms and id the most sour. Next is orange, then olive green, then green and lastly blue.

What are acids and bases?
Two classes of chemi-al compounds that display generally opposite characteristics. Acids taste sour, turn litmus (a pink dye derived from lichens) red, and often react with some metals to produce hydrogen gas. Bases taste bitter, turn litmus blue, and feel slippery. When aqueous (water) solutions of an acid and a base are combined, a neutralization reaction occurs. This reaction is characteristically very rapid and generally produces water and a salt. For example, sulfuric acid and sodium hydroxide, NaOH, yield water and sodium sulfate:

What is a molecule?

Molecules are small particles that make up all living and non-living things.

Why is PH important in the ocean?

pH of the ocean is determined by a need to balance the deposition and burial of CaCo3 on the sea floor against the influx of Ca2+ and CO32- into the ocean from dissolving rocks on land, called weathering.

BREAD

Question: What molecules make the holes in bread?

Hypothesis:

Carbon dioxide causes the holes in bread

Procedure: Add three scoops of yeast to the tube. Add three scoops of sugar to the tube. Fill the tube with ¾ of warm water. Use the stick to stir the yeast and sugar in water. Stir until water is same color as the yeast. Then the mixture is timed for a few a minutes. Shine the flashlight on the side of the tube and watch the bubbles stream up the and notice the bubbles are very small.

Data:

Yeast is a living thing that feed on the sugar molecules. It breaks the sugar molecules apart into new molecules. Carbon dioxide gas molecules make the tiny bubbles you see in the tube

What gas causes bubbles?

Carbon dioxide gas is the cause of bubbles in bread.

How was it produced?

The gas was produced by the yeast that feeds on the on the sugar molecule and breaks the sugar molecule into new molecules.

How does CO2 get in the ocean?

The ocean absorbs CO2. CO2 dissolves easily in cold water.