4. Methods scientists use to determine if a change was physical or chemical

Why phosphorus forms 3 bonds in molecule such as PH3 and PCl3-

Explain the Relationship betw Kinetic Energy Explain how the temperature of a substance is related to the kinetic energy of its molecules

Your class is discussing how the living and nonliving parts of ecosystems are dependent. Describe how changes in the nonliving parts of an ecosystem can affect the ecosystem.

The diagram shows light striking a pane of glass. some of the light is reflected, and some of the light is transmitted. the letters represents six different angles. describe two places where refraction takes place.

The kilogram is the SI unit for mass. True False

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum

Describe a way that people might be able to solve each envioronmental problem listed below. coal mining can harm habitats and cause pollution.

A sample of methane gas occupies 4.50 gallons at a temperature of 80.0 F. If the pressure is held constant, what will be the volume of the gas at 100. degrees C?

Jack wants to know if it takes longer for warm water to freeze into ice cubes than cold water, so he performed the following experiment. Jack placed 50 mL of water in the refrigerator and allowed it to cool to a temperature of 4°C.

How to calculate average concentration