What are the four classifications of matter?

of those four, which two are pure substances?

Write the equilibrium constant: Pb3 (PO4) 2 (s) = 3Pb2 + (aq) + 2PO2 (aq)

Which combination will produce a precipitate? agno3 (aq) and ca (c2h3o2) 2 (aq) naoh (aq) and hcl (aq) nacl (aq) and hc2h3o2 (aq) nh4oh (aq) and hcl (aq) fe (no3) 2 (aq) and koh (aq) ?

What is the scientific notation of 18? Must be a number 1<_ M <10

Which of the following are likely to form a covakent bond

If your front yard is 16.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1250 new snowflakes every minute, how much snow (in kilograms) accumulates on your lawn per hour? Assume an average snowflake has a mass of 2.00 mg.

What does berkelium react with

Classifying living things

Find the parent acid and parent base of al2 (co33, determine if they are strong or weak, and determine if the salt is acidic, basic, neutral, or unpredictable.

A syringe contains 589 mL of CO at 325 K and 1.2 atm pressure. A second syringe contains 473 mL of N2 at 298 K and 2.6 atm. What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 0.00°C?

Which pair of elements can form an ionic compound? A) Two atoms of hydrogen B) One atom of sodium and one atom of fluorine C) One atom of calcium and one atom of chlorine D) Two atoms of hydrogen and one atom of oxygen