Now you should be able to work out the relative formula mass of: Na, Co,.10H,0
Na, co,
10H2O
2 x 23 = 46
20 x 1 = 20
1 x 12 = 12
10 x 16 = 160
3 x 16 = 106
Total= 164
Total = 180
Then you add both: 164 + 180 = 344

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.

In which reaction is precipitation occurring?