A scientist has a 98,3 g sample of silicon, How many silicon atoms are in the sample? A.1.72 x 1023 atoms
B. 2.11 1024 atoms
c. 1.69 x 1025 atoms
D.6.92 x 1025 atoms

Which of these is not an example of chemical weathering? a. iron-rich mineral rusting b. feldspar turning into clay c. limestone reacting with acid d. granite breaking up into sand

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?

Do polar molecules have ionic bonds?