how to do ahyphothesize fourth science

> Atomatic number of the elements 1st Period n = 1 Short period 2 Atomic number 1 and 2 2nd Period n = 2 Short period 8 Atomic number 3 to 10 3rd Period n = 3 Long period 8 Atomic number 11 to 18 4th Period n = 4 Long period 18 Atomic number 19 to 36 5th Peri..

Chemical Reactions and Equations - A physical change is one in which the shape, size, appearance or state, of a substance may alter, but its chemical composition remains same.A change in which the composition of a substance is altered is called as chemical chang..

When the rubber sheet is pulled down, the volume of the cavity increases. This brings the pressure down. Low pressure inside the jar brings the air rushing in through the tubes and inflates the balloon. To demonstrate expiration, the rubber sheet is allowed to go back to its original position...

When the rubber sheet goes back to its position, the volume in the jar is reduced and the pressure is increased. This pushes the air out of the balloon..

How Strong are Acid or Base Solutions? - The strength of an acid depends on the concentration of the hydronium ions (H 3 O + ) present in a solution. We know that greater the number of hydronium ions present, greater is the strength of acid. However, some acids do not dissociate to any ap..

An acid, which dissociates completely or almost completely in water, is classified as a strong aci..

Accumulation of wastes due to its improper disposal is a major problem in our country. Population in India has been growing at a rapid rat..

Acids react with carbonates and hydrogen carbonates (bicarbonates) to form their respective salt, water and carbon dioxide. Carbonate/Bicarbonate + Acid Salt + Water + Carbon dioxide How do Acids and Bases React with Each Other? Acids and bases are the chemical 'opposites' of each other a..

The plant cannot carry out photosynthesis in the absence of light and all the starch present in the leaves is used up. Thus the leaves are destarche..

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