Monthly Archives: March 2017

Elastic Collision - Conservation of Momentum Example — An elastic collision is a collision where total momentum and total kinetic energy is conserved. This illustration shows two objects A and B traveling towards each other. The mass of A is mA and the moving with velocity VAi. The second object has a mass of mB and velocity VBi. […]

Elastic Collision of Two Masses – It Can Be Shown ...

This entry was posted on March 29, 2017 by Todd Helmenstine

About 70% of polybutadiene is used to manufacture tires. (Dean Hochman) — Interesting Polymer Chemistry Demonstration The “jumping rubber” polybutadiene reaction is a dramatic chemistry demonstration in which chemicals are reacted and sealed into a container, which pops open, shooting out a polymer “snake”. Here is how to perform the demonstration. Jumping Rubber Polybutadiene Materials Jumping Rubber kit plastic or rubber gloves […]

Make Jumping Rubber or Polybutadiene

This entry was posted on March 27, 2017 by Anne Helmenstine

Phosphoric acid is an example of an oxoacid. (Ben Mills) — An oxoacid is a type of acid that contains oxygen bonded to hydrogen and another element. This chemistry example problem explains how to identify the strongest acid from a list of oxoacids, also known as oxyacids. Oxoacid Example Problem Which of the following is the strongest acid? HClO4 HClO3 HClO2 […]

Oxoacid Example Chemistry Problem

This entry was posted on March 27, 2017 by Anne Helmenstine (updated on September 30, 2017)

Qualitative data describes, while quantitative data is expressed using numbers. (dirkcuys) — There are two types of data. Qualitative data is descriptive information about characteristics that are difficult to define or measure or cannot be expressed numerically. Quantitative data is numerical information that can be measured or counted. Qualitative → Qualities Quantitative → Quantities Examples of Qualitative Data feelings and emotions texture […]

Qualitative and Quantitative Data – Definitions and Examples

This entry was posted on March 27, 2017 by Anne Helmenstine

Crystal Holiday Stocking — Grow crystals on a holiday stocking to make a glittering crystallized decoration or ornament. Crystal Holiday Stocking Materials You only need a few simple materials for this crystal project: colorfast holiday stocking borax hot water If you don’t have borax, other crystal salts will work, including table salt. The crystals […]

Make a Crystal Holiday Stocking

This entry was posted on March 27, 2017 by Anne Helmenstine

The toasted part of a marshmallow has been carmelized. (John Lustig) — Carmelization is one of the food browning processes, used to give foods a desirable color, flavor, and texture. It is also a process responsible for a burnt sugar flavor or blackening of food. How Carmelization Works Carmelization, like the Maillard reaction, is a form of non-enzymatic browning. It occurs when […]

Carmelization Chemistry – Why Sugar Browns

This entry was posted on March 12, 2017 by Anne Helmenstine