An example of chemical change is A burning, B melting, electrical conductivity, D density

A gas sample containing 1.45 mol at 25°C exerts a pressure of 408 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.

The source of almost all fresh water on earths surface is

how many H + ions are in a solution with a pH of 2 and how many H + ions are in a solution with a pH of 6?

for any substance solid liquid or gas mass increases as volume increases because density represnets mass per volume

A student wants to prepare 250.0 mL of 0.10 M NaCl solution. Which procedure is most appropriate? (formula Molar Mass of NaCl = 58.4 g/mol) A) Add 5.84 g of NaCl to 250. mL of H2O B) Add 1.46 g of NaCl to 250. mL of H2O C) Dissolve 5.

Which can associate a suspect's gun with a crime?

In which era did the first fish appear? a. Carboniferous b. Paleozoic C. Mesozoic d. Permian

How are electrons excited and what happens when the electrons relax

What is the molarity of a solution that is made by dissolving 3.68 g of sucrose (c12h22o11) in sufficient water to form 275.0 ml of solution?

A straight line on a speed-time graph means the speed is constant. this means the speed is not changing over time. how is this different from a distance from a distance-time graph?