1.A student uses toilet paper to demonstrate the distance between Earth and Sun (149,597,890 km). Each sheet of toilet paper = 100,000 km. Each roll of toilet paper is 500 sheets. How many rolls of toilet paper will this student need? a.5
b.3.
c. 8. d.1

What is the molecular formula for a compound that is 46.16% carbon, 5.16% hydrogen, and 48.68% fluorine? the molar mass of the compound is 156.12 g/mol

Stage in which a star’s outer layers have started to cool and grow outward?

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.