Oxygen in the air. The percentage of oxygen in the air can be measured by passing a known volume of air over hot copper, and measuring the decrease in volume as the oxygen reacts with it. Here are the equations for this reaction: copper + oxygen â copper oxide. 2Cu + O2 â 2CuO.
Get ready - World Backup is March 31st! About World Backup Day is a day for people to learn about the increasing role of data in our lives and the importance of regular backups.
Here's a chart that shows what day Earth Day is celebrated from 2014 - 2021. Earth Day is celebrated around the world on April 22. Some cities start celebrating a week in advance, ending the recognition of Earth Week on April 22nd.Others host month long events to stress the importance of teaching about our environment.ote: You will only see this box once. We would like to invite you to sign up for the completely free Apples4theteacher.com Newsletter! Join our other 480,975 readers. Subscribers are automatically registered to receive free teaching resources including lesson plan ideas, printables and more.