. Which objects are luminescent?

a cell phone screen
a black ball
some jellyfish
a neon sign
a computer screen
some plankton
some dogs

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.

What is the percentage of hydrogen in c2h4

When a beta particle is emitted, the mass number of the nucleus a. decreases by one b. increases by one c. remains the same d. decreases by two