How many moles are in 36 g of Beryllium (Be) ?

a. 0.25 mol

b. 4.0 mol

c. 45.0 mol

d. 320 mol

What is the valence electron of manganese?

What is the empirical formula of a compound which consists of 89.14% au and 10.80% o?

All isotopes of an element with an atomic number greater than ___ are radioactive.

Which one of the following compounds is not a salt? 1. Cr (OH) 3 2. Fe (NO3) 3 3. Na2SO3 4. KMnO4 5. Ca (ClO4) 2

As a cake bakes, sodium bicarbonate reacts with acids in the cake. The bicarbonate ion and the anion in the acid change places to make carbonic acid. The carbonic acid then breaks down to produce carbon dioxide bubbles that make the cake rise.

The smallest part of a element that retains the properties of that element

What information can be learned from bloodstains at a crime scene?

1. A window washer does not want to change her position. What does she want the forces acting on her to be? A. small B. large C. balanced D. unbalanced 2. When an object that is moving slows down, which action must be occurring? A. balanced forces B.

Iridium ii phosphate monohydrate

Which of the following does not happen during a chemical change? Mass is gained. New compounds are formed. Old compounds are broken down. Bonds are broken.