1. Intro to General Chemistry

Physical & Chemical Changes

Physical and Chemical Changes

Based on the molecular diagram, classify each change as physical or chemical.
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Matter

Label each of the following as either a physical process or a 
chemical process: (b) production of urine in the kidneys

Physical & Chemical Changes Example 2

Steam and liquid water have the same composition.

Ice and liquid water have the same composition.

Correct, there is a change in composition as burning occurs.

Solid and gaseous carbon dioxide have the same composition.

All of the above are examples of physical changes.

There are no examples in which the composition changes.

 A chemical change results in a change in the composition of matter. 

Which of the following is an example of a chemical change?

Label each of the following as either a physical process or a
chemical process: (c) melting a piece of chocolate

Physical and Chemical Changes: Chemistry for Kids - FreeSchool

Physical & Chemical Changes Example 1

Classify each of the listed properties of ozone (a pollutant in
the lower atmosphere but part of a protective shield against UV
light in the upper atmosphere) as physical or chemical.
a. bluish color
b. pungent odor
c. very reactive
d. decomposes on exposure to ultraviolet light
e. gas at room temperature

Which of the following diagrams represents a chemical
change?

Chemical and Physical Changes

You are working with an artist who has been commissioned to make a sculpture for a big city in the eastern United States. The artist is wondering what material to use to make her sculpture because she has heard that acid rain in the eastern United States might destroy it over time. You take samples of granite, marble, bronze, and other materials, and place them outdoors for a long time in the big city. You periodically examine the appearance and measure the mass of the samples. (a) What observations would lead you to conclude that one or more of the materials are well- suited for the sculpture?

Classify each property as physical or chemical.
a. the boiling point of ethyl alcohol
b. the temperature at which dry ice evaporates
c. the tendency of iron to rust
d. the color of gold

Properties of Matter

Physical & Chemical Changes Example 3

Classify each change as physical or chemical.
a. Natural gas burns in a stove.
b. The liquid propane in a gas grill evaporates because the valve
was left open.
c. The liquid propane in a gas grill burns in a flame.
d. A bicycle frame rusts on repeated exposure to air and water.

You are working with an artist who has been commissioned to make a sculpture for a big city in the eastern United States. The artist is wondering what material to use to make her sculpture because she has heard that acid rain in the eastern United States might destroy it over time. You take samples of granite, marble, bronze, and other materials, and place them outdoors for a long time in the big city. You periodically examine the appearance and measure the mass of the samples. (b) What chemical process (or pro- cesses) is (are) the most likely responsible for any observed changes in the materials? [Section 18.2]

Milk sours when left out of the refrigerator

Tums (containing CaCO3) neutralizes stomach acid.

Sugar caramelizing when heated on a skillet.

Which of the following is a physical change?

A silvery metal is put inside a beaker of water. Bubbles form
on the surface of the metal and it dissolves gradually. (a) Is
this an example of a chemical or a physical change?

A match is lit and held under a cold piece of metal. The following 
observations are made: (a) The match burns. (b) The metal gets 
warmer. (c) Water condenses on the metal. (d) Soot (carbon) is 
deposited on the metal. Which of these occurrences are due to 
physical changes, and which are due to chemical changes?

Classify each property as physical or chemical.
a. the tendency of ethyl alcohol to burn
b. the shine on silver
c. the odor of paint thinner
d. the flammability of propane gas

Classify each of the listed properties of isopropyl alcohol (also
known as rubbing alcohol) as physical or chemical.
a. colorless
b. flammable
c. liquid at room temperature
d. density = 0.79 g>mL
e. mixes with water

Physical Change vs. Chemical Change (ft. mini quiz)

Physical and Chemical Change Examples

atoms or molecules have a lot of space between them

In the solid state, the atoms or molecules are packed closely together in a regular arrangement with restricted movement.

atoms or molecules pack closely but move freely

atoms or molecules pack closely in fixed locations

matter has a fixed volume but not a fixed shape

 The solid state is considered to be a condensed state of matter. 

Melting a chocolate bar then re-solidifying it in the freezer.

Changing water vapor into oxygen and hydrogen gas.

Which of the following represents a reversible change?

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2. Atoms & Elements

3. Chemical Reactions

4. BONUS: Lab Techniques and Procedures

5. BONUS: Mathematical Operations and Functions

6. Chemical Quantities & Aqueous Reactions

7. Gases

8. Thermochemistry

9. Quantum Mechanics

10. Periodic Properties of the Elements

11. Bonding & Molecular Structure

12. Molecular Shapes & Valence Bond Theory

13. Liquids, Solids & Intermolecular Forces

14. Solutions

15. Chemical Kinetics

16. Chemical Equilibrium

17. Acid and Base Equilibrium

18. Aqueous Equilibrium

19. Chemical Thermodynamics

20. Electrochemistry

21. Nuclear Chemistry

22. Organic Chemistry

23. Chemistry of the Nonmetals

24. Transition Metals and Coordination Compounds

[BOOK CHEM] Clutch Version

SI Units

The International System of Units (SI) is related to the metric system and is based on seven base units.

A physical change involves a change in the phases of matter, whereas a chemical change involves a change in chemical bonds.&nbsp;

Physical Properties

Physical Properties are measurable properties that describe the state of chemical compounds.&nbsp;

Significant Figures: In Calculations

Significant Figures are often involved in chemical calculations.&nbsp;

Scientific Notation

Scientific Notation is used to turn small or large inconvenient numbers into manageable ones.&nbsp;

Density of Non-Geometric Objects

The density of non-geometric objects can be determined using water displacement.&nbsp;

Density

Density represents the mass of an object or compound within a given volume.&nbsp;

Significant Figures: Precision in Measurements

Significant Figures are used to discuss the level of precision in any measurement.&nbsp;

Intensive vs. Extensive Properties

Intensive Properties are independent and Extensive Properties are dependent on the size or amount of substance present

Density of Geometric Objects

The density of geometric objects generally includes spheres, cubes and cylinders.&nbsp;

Significant Figures

Significant Figures are used to determine some level of accuracy within our recorded measurements.&nbsp;

Dimensional Analysis

We use dimensional analysis&nbsp;as a fail proof process to convert from one unit to another.

Chemical Properties

Chemical Properties are observed during chemical reactions.&nbsp;

Temperature

Temperature is a measure of the amount of average kinetic energy of the atoms in a compound.

Metric Prefixes

Metric Prefixes are “labels” that can be placed in front of base units.&nbsp;

Conversion Factors

Conversion Factors represent ratios or fractions composed of different units.&nbsp;

Classification of Matter

Chemistry is the study of matter and the changes it undergoes, with the atom being its basic functional unit.&nbsp;