How are electrons excited

Which of the following statements best describes the energy transformation that occurs when a log burns? Mechanical energy changes to heat and light energy. Chemical energy changes to heat and light energy.

A piece of a metal alloy with a mass of 114 g was placed into a graduated cylinder that contained 25.0 mL of water, raising the water level to 42.5 mL. What is the density of the metal?

What is the mass percent (m/m) concentration of a solution prepared from 500. g nacl and 2.50 kg of water?

By the reaction of carbon & oxygen, a mixture of CO & CO2 is obtained. What is the composition by mass of the mixture obtaind when 20 grams of O2 reacts with 12 grams of carbon?

What are the three ways you can identify the layers of the earth

What happens when a firework is ignited?

The spines and thick wavy cuticle on a cactus are both what

What type of chemical process is used to create perfume?

Which of the following is a polyatomic ion? O A. HCI O B. Na O C. PO, O D. 52

What are the cations and anions for V2 (CO3) 3