If the half-life of a radioactive substance is 600 years, what fraction of the original material is left after 1,800 years?

For a process at constant pressure, 24,800 calories of heat are released. This quantity of heat is equivalent to

The compound diborane was at one time considered for use as a rocket fuel. How many grams of liquid oxygen would a rocket have to carry to burn 14 kilograms (14,000 g) of diborane completely? * B2H (g) + 3 O2 (g) → B2O3 (s) + 3 H2O (g)

A rocket uses an engine that creates thrust through the combustion of a liquid fuel and an oxidizer. What kind of rocket is this?

4. How does electron shielding affect atomic size as you move down a group?

What branch of chemestry studies changes in the chemical reactiojs?

Nitrous oxide (n2o), or laughing gas, is commonly used as an anesthetic in dentistry and surgery. how many moles are present in 8.4 liters of nitrous oxide at stp?

How can an atom be electrically neutral when it contains particles that are charged?

Is boiling water considered physical or chemical bond

Which of the following is the correct scientific notation for 0.000451 g? 4.5 x 10-3 4.5 x 10-5 4.51 x 10-4 45.1 x 10-4

A phase change from a solid to a gas is called what