Water Quality, Usage & Conservation
Name one thing that can pollute water sources.
Trash, Oil, Chemicals, Human Waste, etc
Which part of an atom is positively charged?
Proton
If a molecule has different types of atoms, it is a ______________.
compound
What elements is water made up of?
2 hydrogen atoms and 1 oxygen atom
H2O
Acid rain causes
chemical weathering
What is one way people can reduce water pollution at the beach?
Ban plastic and styrofoam, bring reusable water bottles, etc.
What is at the center of an atom?
Nucleus
If a molecule has the same type of atoms, it is an _______________.
element
Why did the paperclip stay on the surface of the water?
surface tension
Why has the statue of liberty changed color?
Most freshwater on Earth is found _________________
If the atomic number of carbon is 6, how many protons does a carbon atom have?
6
What do H₂O (water), Fe₂O₃ (rust), and NaCl (salt) have in common?
They are all compounds.
Why does water stick to itself?
cohesion
How do we get acid rain and what does it cause?
Rain and pollution from factories mix together to form acid rain
It causes chemical weathering
In 2015, __________________________ was the largest use of water in the United States.
thermoelectric power
The atomic number of Nitrogen is 7
The atomic number of Hydrogen is 1
Which atom has less protons?
Hydrogen
What is the chemical formula for salt?
Is it a compound or element?
NaCl/ It is a compound.
What does the term "universal solvent" mean?
Water can dissolve many substances
The freezing and thawing of a rock which breaks it down to smaller pieces is an example of _________________
physical weathering
What are the two main sources of water in Fairfax County?
Potomac River and Occoquan Reservoir
What is true about hydrogen and oxygen atoms in a water molecule?
Oxygen has more protons and electrons than Hydrogen.
How many different elements are in the chemical equation?
CO₂ + H₂O →
3 different elements
C-Carbon
O-Oxygen
H-Hydrogen
Why can water dissolve so many things?
Water molecules act like magnets, and can pull a substance apart.
What is the difference between chemical and physical weathering?
Chemical weathering changes a rock (new color, dissolves, something new forms)
Physical weathering breaks down a rock into smaller pieces.