gr7

gr7

Wednesday 5 December 2012

dec 5 math & science




area of trapezoid corrections below.  tomorrow quiz on area of square, rectangle, paraellogram, triangle and trapezoid.  work on mid chapter review.


 

 

Science 2.1 pg.28

soft drink solution - solute: carbon dioxide, flavors, sugars. solvent: water

cow’s milk – solute: fats, sugars, protein, calcium, vitamins. solvent: water

air – solute: oxygen gas, argon, carbon dioxide, impure gases. solvent: nitrogen gas

heliox – solute: oxygen. Solvent: helium
2.2

Popcorn and milk have a greater volume alone/separately than when they are combined.

When sugar (solute) is dissolved in water (solvent) the particles mix, they move close together/attracted to each other, they fill the empty spaces between each other and, as a result, the solution has less volume than sugar and water separately.

A solute (sugar) whose particles are attracted to a solvent’s particles (water) is said to be soluble (able to dissolve).

A solute (sugar) whose particles are not attracted to a solvent’s particles (oil) is said to be insoluble (unable to dissolve).

Drink crystals:

Sugar, color, flavor (solutes) they are dissolved in water (solvent)

·        Particles are attracted to one another

·        Particles move closer to one another

·        Particles fill empty spaces between each other

·        Solution has less volume than all the solutes separately

Sugar is soluble in water since the particles are attracted

Oil particles are insoluble in water since the particles are not attracted

Fudge: chocolate & sugar (solutes) dissolved in milk (solvent)

With heat, chocolate & sugar particles move closer, attracted to, fill empty spaces in milk particles to form solution; when cooled, it must solidify/harden