Write the molecular formula of ferric oxide and calcium hydroxide by criss-cross method

What’s the scientific notation for the number 6,840,000,000

Which change to the system wood cause the freely-moving piston to lower?

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.