energy activities middle school

Concept of Activation Energy - For a reaction to occur, reactant molecules must collide with each other. Only those collisions result in product formation which have energy equal or more than a certain minimum energy. This energy is called the thres..

Complete the following table by measuring the interior and exterior angles of the figure given above using a protractor. Study the table carefully and identify the relation between exterior and interior opposite angle..

Sodium chloride is taken in a round bottomed flask, and concentrated sulphuric acid is added to the flask through the thistle funnel. Then the flask is heated. The hydrogen chloride gas formed is collected by the upward displacement of air. To obtain dry hydrogen chloride gas, it is passed through..

Remove air from a can by putting a little water into the can and boiling the water in it. The steam forces the air out. Close the opening and keep it below a tap, we find the can crumbling as the pressure inside the can is very small when compared to the pressure outside. ..

Draw a scalene triangle, an acute angled triangle, an obtuse angled triangle, an equilateral triangle and a right angled triangle. Measure the angles in all the figure. Enter the measure in the table given. What do you observe? What do you conclude with respect to the sum of the magnitudes of all ..

Take a thin layer of tissue from the lower surface of the leaf. Mount it on a slide in water and examine under a microscope. You will find tiny pores or stomata along with the epidermal cells. The stomata are bound by a pair of guard cells whose concave sides face each other. It is through the stom..

Set the apparatus as shown in figure 6.7. Firstly, when ammonia is passed through the longer tube and is made to ignite, it does not catch fire. Then oxygen is sent through the shorter tube. Now when ammonia is ignited, it catches fire and the following reaction takes place: Although the pro..

Take about 1 ml each of concentrated hydrochloric acid and liquor ammonia in two different test tubes (Fig.5.7)...

Take hydrated copper (II) sulphate crystals in a test tube and heat. The blue crystals in the test tube start turning white on heating. Water vapours released on heating condense on the cooler part of the test tube. Collect the water drops in a dish. The crystalline copper sulphate turns to a whit..

Hold a pin erect on a pile of papers. Keep another pin next to it upside down in such a way that its flat head rests on the pile. Press both these pins down by placing a flat object such as duster. We observe that pin which is erect pierces through the pile of paper..