How many grams of h2 are needed to react with 2.80 of n2

Agood hypothesis includes which of the following? a: prediction b: data c: uncertainty d: conclusion

The speed of light is around 6.706×10^8 miles per hour. what is the speed of light in units of miles per minute?

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.