Identify some of the signs that has a chemical change has occurred

A) It takes 47.0J to raise the temperature of an 10.7g piece of unknown metal from 13.0∘C to 25.0∘C. What is the specific heat for the metal? b) The molar heat capacity of silver is 25.35 J/mol⋅∘C.

How many moles of dinitrogen tetrahydride are equivalent to 120 grams?

Which of the following are elements nd which are compounds H2, HCI, Na, Al2O3, H2O

The Haber process for producing ammonia commercially is represented by the equation N2 (g) + 3H2 (g) - > 2NH3 (g). To completely convert 9.0 mol hydrogen gas to ammonia gas, how many moles of nitrogen gas are required?

A scientist studied a population of gorillas in central Africa for one year. During this time, four gorillas were born and one orphaned gorilla joined the group. Two older gorillas died and three males left the population to find mates.

Butter is melted in a pan. Which of the following is true about the change? Select one: a. It is a physical change that absorbs energy. b. It is a physical change that releases energy. c.

The freons are a class of compounds containing carbon, chlorine, and fluorine. while they have many valuable uses, they have been shown to be responsible for depletion of the ozone in the upper atmosphere.

Write its complete chemical symbol including mass number, atomic number, and net charge (if any).

How would you be able to use the spectrum of each gas to establish its identity

Which does not add to the reliability of a scientific source of information? displaying data in a colored chart clearly identifying the sources of the data explaining how the data was collected showing that many scientists had reviewed the