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Quiz

CHY 103 Quiz: Chemistry Review Questions (2-20) Chapter 1


Department
Chemistry
Course Code
CHY 103
Professor
Sharonna Greenberg
Study Guide
Quiz

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CHY 103
Chemistry Review Chapter 1
2. How do Solids, Liquids and Gases Differ?
The difference between solids, liquids, and gases at a molecular level is how much room the
atoms have to move around. In solids, the atoms are packed closely together not leaving much
room to move around, thus giving it a definite shape and volume. The atoms in liquids have a
little more room to move around and can take the shape of its container but still have a definite
volume. The atoms in gases have the most freedom with no definite shape or volume.
3. What is the difference between a Chemical Property and a Physical Property?
A physical property is a property is one that a substance displays without changing its
composition. A chemical property is one that a substance displays only by changing its
composition via chemical change.
4. What is the Difference between a Chemical Change and a Physical Change?
The difference between a chemical and physical change is that during a physical
change the chemical composition is not changed where as in a chemical change the
chemical composition is changed. Example: When boiling water, the water is
transformed into water vapor but is still water and the chemical composition hasn't
changed. When rust forms on a nail, iron atoms from the nail combine with oxygen
atoms and form iron (III) oxide and the chemical composition is changed and therefore a
chemical change.
5. Explain the significance of the Law of Conservation of Energy.
The law of conservation of energy states that energy is neither created nor destroyed.
However, every can change from one form to another, and flow from one object to
another, but the total quantity of energy must always remain constant.
6. What kind of energy is chemical energy? In what way is an elevated weight
similar to a tank of gasoline?
Chemical Energy is energy stored in the bonds of chemical compounds (atoms and
molecules) also is potential energy. It is released in a chemical reaction, often producing
heat as a by product (exothermic reaction). Batteries, biomass, petroleum, natural gas,
and coal are examples of stored chemical energy. A raised weight is like a tank of gas,
because both contain potential energy and will undergo change that will lower the
potential energy. Was potential energy is released (converted to kinetic energy) some
of it can be utilized for doing work, such as moving a car.
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