A tree was chopped down and cut up in a local forest. The tree changed in shape.

Which kind of change took place?

A. change in reaction

B. phase change

C. physical change

D. chemical change

Shiny metallic solid unreactive good electrical conduct ductile density 10.5

Which class of organic compounds has molecules that contain nitrogen atoms? (1) alcohol (3) ether (2) amine (4) ketone

Which of the following could result from the fission of carbon? two carbon atoms one large carbon atom two lithium atoms

How many atom are in 3 moles of Ca (OH) 2

What is a rule for determining the mass

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors

Does density of water depend on the amount of water present?

Which of the following air fronts does not move? a Occluded front b Cold front c Stationary front d Warm front