Which five elements make up 99% of biomoleules

A 225 g sample of french fries supplies 460 kilocalories of energy. 65% of those calories come from fat, which supplies 9 kilocalories of energy per gram. How many grams of fat are in the french fries?

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution? 0.113 M 0.151 M 6.62 M 11.3 M

In a controlled scientific experiment, a scientist ... ?

60.0 mL of 0.322 M potassium iodide are combined with 20.0 mL of 0.530 M lead () nitrate. What is the limiting reactant? How many grams of precipitate form?

Urbanization can cause problems with: A) flooding in cities B) soil fertility in nearby farms C) regional weather patterns

Planck's constant is approximately equal to which of the following? The product of the uncertainties in electron position and electron momentum. The sum of the uncertainties in electron position and electron momentum.

Which is the MOST accurate description about how the different types of feedback mechanisms work

Which of the following equations violates the law of conservation of mass? A) 2Al + 6HCl yields 2AlCl3 + 3H2 B) Na2C2O4 + Pb (NO3) 2 yields PbC2O4 + 2NaNO3 C) AgNO3 + LiCl yields AgCl + LiNO3 D) 3Ca + 2Cr (NO3) 3 yields 3Ca (NO3) 3 + 2Cr

Which of the following is a true statement about energy? a. energy can be created and destroyed. b. energy is never created nor destroyed. c. energy is easily created, but cannot be destroyed. d. energy cannot be converted from one form to another.

What does a reaction rate tell you