How do you know a chemical change has occurred?

What is an atomic number, and why is it so useful in identifying elements?

What can affect the properties of a substance? only the types of atoms only the arrangement of atoms the arrangement and types of atoms neither the arrangement nor the types of atoms

How many atoms are in 4H3BO3

4 g of ag2so4 will dissolve in 1l of water. calculate the solubility product (ksp) for silver (i) sulfate.

Which statement best explains why most atomic masses on the Periodic Table are decimal numbers? (1) Atomic masses are determined relative to an H-1 standard. (2) Atomic masses are determined relative to an O-16 standard.

Does skin have a nucleus true or false

Bacteria are only found in decaying matter. A. True B. False

Which is considered a chemical mutagen? tanning beds tobacco X-rays precious metals

Combining 0.380 mol Fe2O3 with excess carbon produced 13.7 g Fe Fe2O3 + 3C → 2Fe + 3CO What is the actual yield of iron in moles? What is the theoretical yield of iron in moles? What is the percent yield?

When a hydrogen electron makes a transition from n=3 to n=1?