Which of these is an example of a physical change?

1. melting a substance

2. breaking chemical bonds

3. forming chemical bonds

2. nuclear decay

Calculate the mass in grams of carbon needed to produce 160 g of CO2 in burning: C + O2 - - > CO2

When two or more refrigerants are mixed, what must be done with the mixture?

Why is plasma a state of matter?

What is the ph of 0.00015 M HCL

What is the pressure of 0.5 mol of nitrogen gas in a 5 L container at 203 K

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues

Which of the following locations would most likely have the most fertile soul?

What is an "alloy" in the chapter of metals in chemistry?