Answer:
cause the ectonic plates moving are what made
Explanation:
B .sharing an electron pair
Answer:
C
Explanation:
A chemical change is which cannot be reversed and produced entirely new products. This is outrightly different from a physical change in which no new products are formed and may simply just involve a phase change.
Now let’s examine each case individually:
A is a physical change. We can physically separate the gold from the coin
B is a physical change. A puddle of water evaporating is just a case of a phase change from liquid to gaseous state. We still have the same water, the only difference is the form in which the water is
C is a chemical change.
For paint to fade, there is supposedly an underlying chemical reaction that would have occurred to make the paint lose its original colour. This is essentially what makes paint fading a chemical change as it cannot be reversed itself. Another coat of paint would be applied which in itself would in the course of time lose its colors too
D is a physical change too, it is just a case of phase change from the liquid state to the solid state
Answer:
There are 55, 49 g of CaCl2
Explanation:
We calculate the weight of 1 mol of CaCl2:
Weight CaCl2=Weight Ca + 2x(Weight Cl)= 40,08g+ 2x 35, 45g=110,98 g/mol
1000ml-----2 mol of CaCl2
250ml------x= (250 ml x 2 mol of CaCl2)/1000ml= 0,5 mol of CaCl2
1mol -----110,98g
0,5mol ---x= (0,5molx110,98g)/1 mol= <em>55,49 g</em>
