Chemistry: Crushing Sugar

While crushing sugar we demonstrated a 

physical change, change in size and shape.

Chemistry: Indicator - Phenolphthalein

• Used to test for the presence of a base.

• It is a colorless chemical
• Turns magenta (bright pink) in a base
• Stays colorless in neutral or acidic solutions.

• 

Chemistry: Indicator - Litmus Paper

Litmus paper

• Has a special dye on it that changes colors in the presence of an acid or base. 

• Blue litmus paper turns red in an acid, and stays blue in a base. 

• Red litmus paper turns blue in a base, and stays red in an acid. 

• Neutrals react with both types of litmus paper turning it violet.

Chemistry: Indicator - Finding the pH Level with pH Scale

pH paper: 

Has a range of colors depending on the pH of the solution.

•The color of the paper is compared to the chart on the vial to determine the pH. 

Chemistry: Density Lab

Density (g/mL) = Mass (g) / Volume (mL)

Mass is the amount of matter an object contains. How do you measure the mass of an object?

What measuring tool can you use to measure volume?

Chemistry: Ability to Burn (Chemical Property) with Steel Wool & 9-Volt Battery

 The steel wool definitely produced light and heat!

The steel wool just needed an ignition source (battery) to get started and when the source was removed it continued to produce light and heat (fire - burning) because of it's interaction with OXYGEN!

When you ask a seventh grader to take pictures for you...

but first, let me take a selfie!

Chemistry: How much oxygen is in the atmosphere? Lab

This lab demonstrated the chemical property of burning.

The ability to burn involves a substance reacting quickly with OXYGEN to produce light and heat.

How do you know we measured oxygen?

Page 15 in Science Notebook