1. http://www.youtube.com/watch?v=Xi3oI_mGOHQ&feature=related Gymnastics

2. So the link… What do weight lifting, gymnastics and Chemistry have in common?

3. Chemistry of chalk and MgCO 3,

4. The lifters use chalk on their hands to aid gripping the bar and to remove moisture, which could cause the bar to slip. Weightlifting and the link to chemistry Chalk, a naturally occurring or man-made substance, is engulfed with chemistry and it is here that a link between chemistry and weightlifting can be found.

5. Lawn tennis – line boundaries of court When the ball hits a boundary line it makes a cloud of dust. Natural chalk has mostly been replaced with titanium oxide now in tennis. Gymnastics & rock climbing – stop slipping Chalk is applied to hands, arms & legs to stop slipping and absorb moisture. Natural chalk has mostly been replaced with magnesium carbonate here. Chalk in sport

6. Small amount found in tooth paste Implements to write with on black boards or for pavement drawings Other uses of chalk

7. Chalk is: Natural chalk is formed in the ground and is: Porous sedimentary rock – can hold water A form of limestone Composed of the mineral calcite A soft solid White It can also be found naturally as red in colour The characteristics of chalk

8. It has similar characteristics to chalk in that it is a white, soft solid. Natural chalk has widely been replaced with a man-made chalk called magnesium carbonate. Draw a dot and cross diagram and describe the bonding. What are the properties? The empirical formula of magnesium carbonate is MgCO 3. Man-made chalk

9. Magnesium carbonate, although used in sport, also has a range of other uses which include being used in: Flooring Fireproofing Fire extinguishing Cosmetics Dusting powder Drying agents Laxatives for loosening bowels