Which of the following is a physical change

A copper roof changing colors from orange to green

Sawing a piece of wood in half

Rust forming on an iron fence

Burning a piece of wood

What is the osmotic pressure of a 10 M solution of maple syrup at 25 °C?

Which of the following do physicists believe are fundamental particles? a. three quarks and three leptons c. three quarks and six leptons b. six quarks and three leptons d. six quarks and six leptons

Which of the following are likely to not form bonds? A gold atoms. b. Oxygen atoms. c. neon atoms. d. magnesium and chlorine atoms.

What physical method can separate a mixture of steel ball bearings and marbles

Which of the following statements is true? 1. Dalton believed atoms were made mostly of empty space. 2. Plasmas have a net negative charge. 3. The number of protons in an element is always equal to the number of neutrons. 4.

How are protons, electrons, and neutrons correctly compared

You compare two layers to a because the crust and upper mantle are solid

A substance that speeds up the rate of a chemical reaction is called a. a catalyst. b. a lipid. c. a molecule. d. an element.

How many moles of Mgs203 are in 245g of the compound

A student was trying to obtain lithium by electrolysis of aqueous lithium chloride. Was he successful?