We will start with one and then I will add more over the next few days. Day One – A Cells Blooket. Day Two – Chemical Reactions Blooket. Day Three – Atoms & Molecules Quizizz. Day Four – Light & Colour Kahoot.
Oxygen Is (Roughly) 20% Of Dry Air…
I do love a snappy post title! Air contains lots of moisture. It can be as much as 30 g of water in every 1 m3 of air. If you dry the air (by passing it over a chemical that reacts with water) then the mixture remaining is slightly more than 20% oxygen. You can …
Continue reading Oxygen Is (Roughly) 20% Of Dry Air…
Galvanised Into Action…
This is another post in the Rusting Series. Please make sure that you have read the others if you are here revising for upcoming exams – otherwise just relax and absorb. Many metals corrode over time; they become weaker as they react with their environment and often eventually break, crumble or otherwise fail. Iron (steel) …
Continue reading Galvanised Into Action…
Lithium…
Lithium is the third element on the periodic table and first metal. It sits in Group I with the other reactive metals such as sodium and potassium. It is soft, low density and highly reactive – although the least so of the alkali metals. Apparently they used to put lithium citrate into 7-Up although they no …
Continue reading Lithium…
Rates Of Reaction…
A chemical reaction involves reactants turning into products. You can tell when a reaction has happened because there will be production (or sometimes absorption) of energy; usually in the form of heat but sometimes light & sound too. There may also be a change of colour but this doesn’t always happen. The end products will …
Continue reading Rates Of Reaction…
Flowering Plants…
The above is a labelled diagram of an insect pollinated flower. You can tell that it is pollinated by an insect because of the large petals. In reality it would probably have a bright colour, pleasant smell and nectar to attract the pollinator. What do all the bits do? The anther and filament together are …
Continue reading Flowering Plants…
Pressure…
I have never really written much about pressure on the blog. Perhaps it has always seemed a little dull but questions do come up about pressure so I ought to have a go. It ties in nicely with the posts about forces because pressure is force applied per square centimetre. At C.E. pressure will always …
Continue reading Pressure…
Leaves (Part Two)…
There is a Leaves (Part One) which you could look at before this if you are in any doubt about your leaf knowledge. The above is a cross-section through a typical leaf. There is an actual microscope photograph of a similar leaf below. It should be fairly easy to compare structures between the two pictures. …
Continue reading Leaves (Part Two)…
Copper…
After iron and aluminium, copper is probably the third most important industrial metal. It is used in electrical wiring and for printed circuit boards (PCB). The board is completely coated in copper then copper is etched away to leave the path that the electricity needs to follow. Copper is also used for plumbing although it is …
Continue reading Copper…
Units and Calculations…
There are not a great many types of calculation you will be asked to do at this level. You may be asked about speed, density, pressure or perhaps calculating weight from mass and the force of gravity. The question will usually give you enough information for you to work out what sums you need to …
Continue reading Units and Calculations…
Leaves (Part One)…
Leaves are the factories of plants. They have a large surface area for gaseous exchange. They can absorb gases from the air through the tiny pores on their undersides called stomata (singular stoma). They also open and close these to regulate water evaporating from the leaf.