Celina has a water sample that's contaminated with salt and microorganisms. Which method should she use to purify the water A.

distillation

B.

filtration

C.

osmosis

D.

reverse osmosis

Use the periodic table to find the atomic weight for tin (Sn). 50 119 170

Glass breaking is an example of: Chemical change Chemical properties Temperature change Physical change

Equations can be balanced by using the half-reaction method. Which step should be completed immediately after finding the oxidation states of atoms?

Which of the following is not a result of air pollution? A. Smog B. Breathing problems C. Global warming D. Soil erosion

What is an element? a. A substance that is made of water. b. A substance made of only one type of atom. c. A substance that is made of no atoms. d. A substance made of more than one type of atom.

Much of life on Earth is based in aquatic biomes. What property of water allows life to survive in liquid water?

A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have? 13 9 5 4

Calculate the maximum mass of carbon dioxide that could be obtained by adding excess hydrochloric acid to 15 g of calcium carbonate.

True or false: during dry weather, the water level in a small pond drops because of runoff.

Bradley hit a baseball with a bat. The baseball then hit a window and caused the window to break. Where did the energy that broke the window come from?