Describe how physical and chemical changes are different. how are they similar?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

An unknown substance has been shown to have weak covalent bonds. which of the following is most likely a property of this substance? a. high ph b. high conductivity c. low melting point d. low flammability

Which of these natural resources is non-renewable a.corn b.wind c.geothermal d.natural gas