A mixture is -

a. a chemical combination of two or more different materials.

b. a physical combination of two or more different materials.

c. a precipitate and its solution.

d. a single element.

Justin Bleeber is a lazy young man and decides to burn a pile of leaves instead of bagging it. The pile of leaves weighed three pounds before being burned. After the leaves are burned the leftover ash weighs half a pound.

A bicycle rider travels 50.0km in 2.5 hours. what is the cyclist average speed

What happens if somebody loses control of a fission reactor?

Which of the following substances would be a good electrical conductor? A. KCl (s) B. C (s) C. Al (s) D. CO2 (s)

Trace amounts of copper are required for good healt. but high concentrations of copper can be toxic. under what conditions might too much copper go into solution?

Which type of bond forms between water molecules? a. strong bond b. hydrogen bond c. covalent bond d. polar bond

Down syndrome is caused by the presence of an extra copy of chromosome 21. how would a karyotype identify a person with down syndrome? a) ID physical characteristics of someone with the disease.

Which expression is a measurement of denisty

Compare the information provided by a molecules chemical formula to the information provided by its structural formula

How is a circle different from an ellipse