Is grinding baking soda into a powder a physical or chemical change

The volume of a given quantity of a gas must increase if:

Iodine, I2, is a solid at room temperature but sublimes (converts from a solid into a gas) when warmed. What is the temperature in a 73.3-mL bulb that contains 0.292 g of I2 vapor at a pressure of 0.462 atm

How many atoms or molecules are in 5.0 moles of the following? a. O b. N c. MgCl₂ d. C₂H₃NO

The producer in an energy pyramid contains about 1,000 kcal of energy

The transfer of energy changes the what of water

Fluorin is often added to drinking water and toothpaste

What larger energy does light energy come from?

Allows water to pass through easily

Which is a cause of desertification? A. farming B. creating reservoirs C. overgrazing D. driving motor vehicles

What happens when the threat of exposure to dirty air is reduced in a community? There is enough oxygen available for people's lungs to function normally The amount of indoor air pollutants released during a fossil fuel burn decreases There is a