This is an attempt to explain all the basic area and volume formulas as simply and intuitively as possible, starting with the easy ones and building up to the more difficult formulas for the area and volume of a sphere. Areas of Plane Figures Area of a rectangle or parallelogram with base b and height h is bh. This is obvious for a rectangle.
Wear eye protection and rinse splashes off the skin. Universal indicator is dissolved in ethanol, so it is highly flammable in the stock bottle, but not once added to agar.
Heat, in an aluminium water bath filled with boiling water, with stirring, until the agar solution boils, then allow to cool. Make the agar blocks in straight-sided dishes or ice cube trays.
If students cut cubes themselves, each group will need a block 2 cm x 3 cm x 2 cm. If you have chosen to use hydrochloric acid to soak the cubes, make up the agar with 0. Dissolve 1 g in cm3 of IDA then make up to 1 litre with water.
Ethical issues There are no ethical issues associated with this procedure. Take care with the solutions used: Preparation a Make up plain technical agar with sodium hydroxide and universal indicator, or with sodium hydroxide and phenolphthalein.
Notes 1 and 2. Investigation a Collect agar cubes of different sizes — 2 cm x 2 cm, 1 cm x 1 cm and 0. Rinse the cubes in a little water and blot the surfaces of each cube dry with a paper towel.
If the acid does not penetrate the largest block in the time available, cut the block and measure how far it has penetrated in the time.A sphere (from Greek σφαῖρα — sphaira, "globe, ball") is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball (viz., analogous to the circular objects in two dimensions, where a "circle" circumscribes its "disk")..
Like a circle in a two-dimensional space, a sphere is defined mathematically as the set of points that are all at.
The hydrophobic effect is the observed tendency of nonpolar substances to aggregate in an aqueous solution and exclude water molecules. The word hydrophobic literally means "water-fearing", and it describes the segregation of water and nonpolar substances, which maximizes hydrogen bonding between molecules of water and minimizes the area of contact between water and nonpolar molecules.
I’ve had a request to (once again) go through an explanation of the (poorly-named) Greenhouse Effect (GHE). Hopefully there is something which follows that will help you understand this complex subject. The greenhouse effect usually refers to a net increase in the Earth’s surface temperature due.
“Arctic sea ice volume has rebounded and is close to normal levels, despite the very warm surface conditions in the Arctic this past winter.
This can only indicate that other sub surface cooling factors (such as ocean dynamics) are at play. Gregg (, p. 63) used the term "activity of a solid'' to denote chemical and physico-chemical reactivity; he wrote (, p.
64) that an increase in activity is usually traceable to an increase in the surface area . The hydrophobic effect is the observed tendency of nonpolar substances to aggregate in an aqueous solution and exclude water molecules. The word hydrophobic literally means "water-fearing", and it describes the segregation of water and nonpolar substances, which maximizes hydrogen bonding between molecules of water and minimizes the area of contact between water and nonpolar molecules.