Element x is in group 2 and element y is in group 17. a compound formed between these two elements is most likely to have the formula:

a. x2y7
b. xy2
c. x7y2
d. x2y

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.

How do dying stars contribute to the formation of planets

Sheela and her brother hari were sitting in the living room, watching tv. suddenly hari said that he thinks something is burning in the other room. how did he get the burning smell?