Which element represents 10% of the elements in the human body?

a. calcium

b. nitrogen

c. hydrogen

d. oxygen

Balance the reaction which forms ions. Choose "blank" if no coefficient other than 1 is needed. Pb (N03) 2 (aq) - - > ___ Pb+2 + __ NO3 -

Explain how you would decide which represents a greater mass: 3.25 x 1022 atoms of Ca or 2.45 grams of Mg?

When trying to identify an unknown element, a scientist determines what other elements the unknown element reacts with chemically. Which property of the unknown element determines the other elements it reacts with?

B) How many g of O2 are needed to produce 6.0 mol of H2O?

What's the reaction between coke and salt?

Which metal is more active than tin, but less active than zinc

Why does the amount of energy available change as you move from one trophic level to the next?

What type of bond holds metal atoms together?

Imagine you are purifying a protein which accounts for 0.001% of the total protein within a cell. how many steps of purification are required to yield pure protein, assuming a 10 fold purification with each step of purification?

If an object has the mass of 109.67 g and a volume of 16.99 cm3 what's its density