Water and salt are compounds made of the combination of more than one type of atom. Which statement is false?
А
Because they are compounds, they cannot be pure substances.
B
Both compounds are considered pure substances.
These compounds have specific physical properties that never
change.
D
These compounds have distinct chemical properties.

What overall charge must all compounds have

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Most metamorphosis processes take place