Sugar burns and turns black. A completely new substance was formed, which is the main pointer for it being a chemical reaction. More evidence would be change of color, odor, and the fact that flammability is a chemical property so setting something on fire would be a chemical change.
Answer:
The annual production of carbon dioxide is
.
Explanation:
Distance covered by each car = 5790 miles
Rate of consumption of gasoline =24. mile/gal
For every 24.1 mile 1 gallon of gasoline is used
Gasoline used by a single car by travelling 5790 miles =

Number of cars in the United states = 40.0 million = 
Total gallons of gasoline consumed by 40 million cars = 
1 gallon of gasoline produces = 9.50 kg of 
Then
of gasoline will produce:
of 
The annual production of carbon dioxide is
.
1. P<span>eriodicity (the repetition of several properties in a row on the Periodic Table)
2. Noble Gas (Noble gases are located in group 18 on the Periodic Table)</span>