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22 Cards in this Set

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1A
List 3 direct uses of water besides bathing, drinking, cooking, cleaning or washing.
Answers many vary. Examples: painting with water colors, mixing plaster of paris, working with clay
1A
List three indirect uses of water.
Answers may vary. Examples: watering flowers, water use to wash containers out before packaging, water used to put in radiator of truck making delivery of food to the store.
1A
Describe at least 3 processes used to clean and purify water.
1. Sand and gravel filtration is used to remove large particles.
2. Filter paper is used to remove smaller particles.
3. Charcoal is used to remove odors.
4. Chlorine is used to kill bacteria present and make water safe for drinking.
1A
Where is most of the earth's water located?
In the ocean. 97.2% of the earth's water is in the ocean.
1B
List three physical properties of water?
Answers may vary. Examples:
density = 1g/ml
liquid at room temperature
freezes at 0 degrees celsius
boils at 100 degrees celsius
1B
What is the difference between a heterogenous mixture and a homogenous mixture? Give examples.
Heterogenous mixtures are not distributed evenly. Colloids are examples-mayonaise, raw milk
Suspensions are example- muddy water
Homogenous mixtures are evenly distributed: Example-tea
1B
What is the difference between a colloid and suspension?
Colloids contain particles small enough to remian suspended in solution. Suspensions contain particles large enough that they settle out of solution.
1B
What is happening when a substance dissolves?
The substance separates into particles in the solution so small they cannot be seen.
1B
What is the difference between an atom and an element?
An atom is the smallest particle of an element. A molecule is the smallest particle of a compound and contains two or more elements.
1B
What is a pure substance?
Each element and compound is considered a pure substance because each has a difinite and uniform composition and has distinct properties.
1B
What is a solution?
All solutions are homogenous mixtures.
1B
What is the difference between a solute and a solvent?
A solute is the substance being dissolved. A solvent is the substance dissolving.
1B
What do chemical symbols and chemical formulas represent?
Each element is assigned their own chemical symbol. A chemical formula indicates the number and type of each element found in a compound.
1B
What is the purpose of a subscript in a chemical formula?
The subscript represents the number of that type of atom present in the compound.
1B
What does a coefficient represent?
The coefficient, the large number in front of a chemical formula, represents the number of molecules or moles of that compound. Ex: 3 CO2 represents 3 molecules or moles of carbon dioxide
1B
What do chemical equations represent?
Chemical equations summarize the details of a particular chemical reaction.
1B
How do you determine the reactants and products in a chemical reaction?
The reactants are the substances you start with in a chemical reaction. The products are the end result of the reaction.
1B
What are diatomic molecules. List them.
Diatomic molecules are substances that exist as two bonded atoms. These are H2,O2,N2,F2,Cl2,Br2,I2
1B
Describe and ionic compound and give three examples.
An ionic compound is composed of positive and negative ions or metals and nonmetals such as NaCl, table salt.
1B
What is the difference between a cation and an anion?
Cations are composed of positively charged ions, ions that have given up electrons, while anions are composed of negatively charged ions, ions that have borrowed extra electrons.
1B
What is a precipitate?
An insoluble substance that forms during a chemical reaction.
1B
What is the difference between a ionic compound and a molecular compound?
An ionic compound is composed of cations and anions. In a molecular compound the atoms share electrons.