Liquid water (H2O) is formed when two gases, hydrogen (H2) and oxygen (O2), react. Why are the properties of water different than those of the
reactant gases?
Select one:
Water wil retain some of the properties of hydrogen as there are more hydrogen
atoms in water than oxygen atoms.
When substances chemically combine, products with completely different properties
form.
The properties of the two gases are combined to give water its properties.
Water has similar properties to either hydrogen or oxygen gases.

If oil spills continue, all of the following should be expected except (2 points) death of aquatic life. polluted groundwater. decreased soil productivity. increased global temperatures.

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.

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal