Tagged: light sensor
types of battery
Batteries are a handy source of power. Just think of all the things that use them – calculators, cassette players, even computers will run on batteries. You’ll know that there are different kinds of...
photosynthesis
How are plants affected by light? During photosynthesis oxygen is produced. How much photosynthesis occurs depends on how much light there is. You can measure the amount of oxygen produced using sensors connected to...
when do plants grow
It’s not easy to measure how fast a plant grows. You would probably not be too keen to take measurements every few hours – and especially not overnight. There are ways, however, of seeing...
changes in an aquarium
Life in any aquatic habitat has to be supported by oxygen. We are all too familiar with rivers and streams where the oxygen supply has been exhausted and the river dies. The production and...
investigating the enzyme amylase
Amylase catalyses the breakdown of starch into sugar. How is the activity of this enzyme affected by temperature? You can start to find out by monitoring the activity at different temperatures. You use Iodine...
measuring visible change in liquids
Measuring the appearance of cloudy sulfur when we mix acid and sodium thiosulfate is a popular science teaching activity. We can change the temperature or concentration of the reagents, and see whether the mixture...
effect of temperature on rate of reaction
If you were a chemical manufacturer you would certainly be interested in finding ways to increase the rate of production. One way is to do the reaction at a higher temperature, and in this...
day and night light & temperature
What time does it get light in the morning? When does it get dark? Is the central heating working? I just had to know, so I took my data logging equipment and started to...
checking a TV remote controller
An infrared remote control unit sends messages, using infrared ‘light’ to recorders and televisions. Point a remote controller at a light sensor and it may be able to pick up the signal. This likely works...
colorimeter for acid reacting with thiosulfate
A colorimeter for the reaction of acid and thiosulfate – rates of reaction The reaction of acid with thiosulfate produces a precipitate in a beaker, and we normally measured how quickly a cross drawn...
rates of reaction
what affects the rate of reaction? A chemical reaction can be made to go fast or slow. In this activity you will try to measure how a chemical reaction is affected by temperature. When...
