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Summer Ebs

Density & Buoyancy

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Table of Contents

Section 1: Chemistry
Properties of Matter

30m 50s

Intro
0:00
Matter
0:07
Matter
0:08
Substance, Element, and Compound
0:47
Homogeneous and Heterogeneous Mixture
1:47
Suspension, Colloid, and Solution
3:16
Physical Properties
5:25
Appearance: Color, Shape, Size, Density, and State of Matter
5:26
Behavior: Viscosity, Magnetism, Malleability, and Ductility
8:00
Physical Changes
10:29
Physical Changes
10:30
Chemical Properties
14:38
Chemical Properties
14:39
Chemical Changes
16:35
Chemical Changes
16:36
Signs of Chemical Change
16:55
Example 1: Identify the Mixtures Listed
19:21
Example 2: Physical or Chemical Change?
23:38
Example 3: How Can You Separate a Mixture of Sand, Gravel, Iron, Filings, Salt, and Water?
25:04
Example 4: Physical/Chemical Property and Change
27:27
Energy

53m 22s

Intro
0:00
Energy
0:03
Energy Overview
0:04
Potential Energy
1:48
Potential Energy
1:49
Mechanical (Elastic) Potential Energy
1:54
Chemical Potential Energy
3:15
Nuclear Energy
4:06
Gravitational Potential Energy
4:43
Kinetic Energy
7:34
Kinetic Energy
7:35
Thermal Energy
8:03
Radiant Energy
8:57
Electrical Energy
9:47
Sound
10:17
Motion
10:54
Kinetic Energy: Example
11:31
Law of Conservation of Energy
12:47
Law of Conservation of Energy
12:48
Electrical to Radiant
13:21
Chemical to Thermal
14:34
Potential to Kinetic
15:10
Friction
18:48
Energy Resources
20:06
Nonrenewable: Fossil Fuels
20:51
Nonrenewable: Nuclear
21:56
Renewable: Solar
26:50
Renewable: Wind
29:22
Renewable: Tidal
31:10
Renewable: Hydroelectric
32:30
Renewable: Geothermal
35:24
Example 1: Gravitational Potential Energy
38:40
Example 2: Kinetic Energy
42:20
Example 3: Maximum and Minimum Potential and Kinetic Energy
44:48
Example 4: Should We Use Renewable or Nonrenewable Resources to Generate Electricity?
46:31
Heat and States of Matter

48m 48s

Intro
0:00
Temperature
0:04
Temperature
0:05
Fahrenheit to Celsius
2:15
Celsius to Fahrenheit
4:29
Kelvins to Celsius and Celsius to Kelvins
5:50
Thermal Energy
8:06
Thermal Energy, Kinetic Energy, and Potential Energy
8:07
Changing Thermal Energy: Temperature
9:11
Changing Thermal Energy: State of Matter
9:37
Changing Thermal Energy: Amount of Matter
10:12
Heat
10:59
Heat
11:00
Specific Heat
12:21
Transfer of Thermal Energy
15:15
Conduction
15:16
Convection
16:43
Radiation
19:57
States of Matter
20:43
Solids: Arrangement of Atoms, Shape, Volume, and Molecular Motion
21:35
Liquids: Arrangement of Atoms, Shape, Volume, and Molecular Motion
23:49
Gases: Arrangement of Atoms, Shape, Volume, and Molecular Motion
25:33
Plasma: Arrangement of Atoms, Shape, Volume, and Molecular Motion
27:02
Changing States of Matter
27:49
Melting
27:50
Freezing
28:15
Vaporization
29:04
Boiling
29:17
Condensation
31:21
Temperature and Time Graph
32:18
Thermal Expansion
36:19
Thermal Expansion of Solids
37:16
Thermal Expansion of Liquids
38:17
Thermal Expansion of Gases
39:46
Example 1: Converting Temperatures
40:28
Example 2: Thermal Energy
43:35
Example 3: Quick Matching
44:58
Example 4: Why Does It Feel Cold When You Put Your Hand On the Table?
45:50
Example 5: Heat Transfer
46:48
Example 6: Changing States of Matter
47:29
Atoms and Elements

30m 12s

Intro
0:00
Atoms
0:05
Atoms
0:06
Atomic Structure
1:01
Electron Cloud
1:02
Nucleus, Protons, and Neutrons
1:43
Quarks
2:07
Protons, Neutrons, Electrons
2:40
Protons, Neutrons, Electrons: Location
2:42
Protons, Neutrons, Electrons: Electric Charge
3:05
Examples
4:10
Electron Configuration
5:32
Electron Configuration
5:33
Elements
12:22
Atomic Number
13:05
Carbon
13:15
Oxygen
14:49
Important Elements for Living Things
16:25
Isotopes
17:04
Isotopes
17:05
Example 1: Atomic Structure and Electrical Charge
21:16
Example 2: Electron Configuration
23:13
Example 3: Electron Configuration
24:57
Example 4: Use the Periodic Table to Complete the Table Below
26:08
Periodic Table

47m 23s

Intro
0:00
Periodic Table
0:06
Atomic Number, Chemical Symbol, and Atomic Mass
0:07
Groups and Periods
4:14
Groups and Periods
4:15
Electron Dot Diagrams
10:05
Electron Dot Diagrams
10:06
Ion Formation
19:09
An Ion Forms When an Atom Gains or Loses Electrons
19:10
A Positive Ion Forms When an Atom Loses and Electron
20:25
A Negative Ion Forms When an Atom Gains an Electron
26:49
Oxidation Numbers
28:51
Oxidation Numbers
28:52
Metals, Nonmetals, Metalloids
34:52
Metals, Nonmetals, Metalloids
34:53
Example 1: Group and Period
37:39
Example 2: Electron Dot Diagrams
39:50
Example 3: How do Fluorine and Calcium Become Ions?
42:10
Example 4: What Are 2 Ways to Find the Oxidation Number of Sodium?
44:58
Chemical Bonding, Part I

51m 6s

Intro
0:00
Chemical Bonds Form Compounds
0:17
Atoms and Electrons
0:18
H2O
2:14
HCl
3:36
C6H12O6
4:16
Ca(NO3)2
5:06
Review: Dot Diagrams
7:10
Review: Ion Formation
8:30
Ionic Bond
9:57
Ionic Bond
9:58
Sodium and Fluorine
10:41
Magnesium and Chlorine
16:30
Covalent Bond
22:19
Covalent Bond
22:20
Hydrogen and Carbon
23:58
Hydrogen and Oxygen
27:28
Multiple Covalent Bonds
29:03
Single Covalent Bond
29:04
Double Covalent Bond
29:40
Triple Covalent Bond
31:50
Polar and Nonpolar Molecules
33:33
Polar Molecules
33:34
Unequal sharing of Electrons and Electronegativities
35:02
Nonpolar Molecules
37:46
Example 1: Elements and Atoms
38:42
Example 2: Dot Diagram of the Bond That Forms Between Magnesium and Oxygen
41:17
Example 3: Dot Diagram of the Bond That Forms Between Nitrogen and Oxygen
45:24
Example 4: Polar or Nonpolar?
47:22
Chemical Bonding, Part 2

56m 22s

Intro
0:00
Bonding Atoms Make Compounds
0:05
Binary Compounds
0:06
Reviwew: Oxidation Number
1:14
Naming Ionic Compounds
1:45
Naming Ionic Compounds
1:46
NaCl
2:26
MgCl2
5:04
Al2S3
6:52
Writing Formulas of Ionic Compounds
10:03
Writing Formulas of Ionic Compounds
10:04
Beryllium Fluoride
10:17
Lithium Nitride
12:24
Calcium Bromide
13:53
Polyatomic Ions
15:31
Polyatomic Ions
15:32
Ammonium Phosphate
17:21
Aluminum Hydroxide
19:37
Magnesium Chlorate
20:54
NaOH
21:47
(NH4)2O
22:17
Mg(NO3)2
22:56
Special Ions
23:28
Iron (III) Iodide
24:28
Lead (IV) Chloride
26:30
Chromium (III) Oxide
27:31
Fe3P2
29:18
CuI2
31:51
PbBr2
33:04
Naming Covalent Compounds
33:57
Naming Covalent Compounds
33:58
Examples
35:03
Ionic or Covalent?
39:50
Ionic vs. Covalent: Electron
39:51
Ionic vs. Covalent: State At Room Temperature
10:23
Ionic vs. Covalent: Metal, Nonmetal, Metalloids
41:02
Ionic vs. Covalent: Naming
41:35
Example 1: Write the Names or Formulas for Each Ionic Compound
42:50
Example 2: Write the Names or Formulas for Each Covalent Compound
46:13
Example 3: Name the Following Ionic Compounds
49:44
Example 4: Provide the Formulas for the Following Ionic Compounds
52:19
Example 5: Ionic or Covalent?
54:21
Chemical Reactions

49m 13s

Intro
0:00
Chemical Reactions
0:05
Chemical Reactions
0:06
Chemical Formula Example
0:54
Reactants and Products
3:50
Conservation of Mass
4:58
The Total Mass of the Reactant Must Equal the Total Mass of the Products
4:59
Balancing Chemical Equations
6:42
Balancing Equations
11:12
Example 1: Balancing Equations
11:27
Example 2: Balancing Equations
14:15
Example 3: Balancing Equations
16:28
Types of Reactions
19:17
Synthesis
19:18
Decomposition
20:09
Single-Displacement
20:54
Double-Displacement
22:12
Combustion
23:34
Energy in Chemical Reactions
24:41
Chemical Reactions and Activation Energy
24:42
Endergonic Reactions
25:55
Exergonic Reactions
27:51
Rate of Chemical Reactions
29:42
Rate of Chemical Reactions Overview
29:43
Temperature
30:51
Concentration
31:26
Agitation
32:08
Surface Area
32:29
Pressure
33:06
Catalysts and Inhibitors
33:18
Example 1: Translate Into Chemical Equations
34:32
Example 2: Law of Conservation of Mass
37:35
Example 3: Balance the Following Equations
40:33
Example 4: Math Each Equation With the Correct Type of Reaction
44:58
Example 5: Exothermic or Endothermic Reaction?
48:21
Solutions, Acids, and Bases

29m

Intro
0:00
Solutions
0:06
Definition of Solution
0:07
Solute and Solvent
0:26
Example: Salt Water
0:35
Example: Carbonated Water
1:03
Dissolving
1:49
Dissolving
1:50
Example: Liquid Dissolves a Solid at the Surface of the Solid
3:54
Aqueous Solutions: Water as Solvent
4:42
Increasing the Rate of Dissolving
5:33
Stir
5:34
Crush
6:37
Heat
7:36
Solubility
8:31
Definition of Solubility
8:32
Compare the Solubility of Sugar in Water vs. Salt in Water
8:44
Factors that Affect Solubility
11:45
Concentration
12:45
Concentration
12:46
pH Scale
15:21
pH Scale: Acids, Neutral, and Bases
15:22
Acids and Bases
18:01
Chemical Properties
18:02
Physical Properties
18:43
pH Scale
19:31
Examples of Acids and Bases
19:36
Acids and Bases React Together to Form Salt and Water
20:09
Example 1: Identify the Solutes and Solvents for the Following Solutions
21:26
Example 2: Temperature and the Rate of Dissolving/Solubility of a Solid
23:57
Example 3: How Can You Make a Solution Have a Higher Concentration?
25:44
Example 4: Acids and Bases
27:57
Section 2: Physics
Waves

42m 35s

Intro
0:00
Waves
0:05
Introduction to Waves
0:06
Mechanical Waves
1:24
Electromagnetic Waves
1:50
Mechanical Waves
2:13
Transverse
2:14
Longitudinal (Compressional Waves)
4:00
Properties of Waves
7:26
Transverse and Compressional Waves: Wavelength
7:27
Transverse and Compressional Waves: Frequency (Hz)
9:32
Transverse and Compressional Waves: Amplitude
11:30
Wavelength and Frequency are Related
13:40
Wave Speeds
15:01
Wave Speeds
15:02
Behavior of Waves
18:06
Reflection
18:33
Refraction
22:42
Diffraction
24:25
Electromagnetic Waves
26:00
Electromagnetic Waves
26:01
Visible Light
30:49
Visible Light
30:50
Opaque
34:25
Translucent
34:54
Transparent
35:41
Example 1: Label the Transverse Wave
36:59
Example 2: Label the Compressional Wave
38:13
Example 3: What Happens to the Frequency of a Wave as the Wavelength Increases?
39:12
Example 4: Law of Reflection and Light Wave
40:48
Motion

37m 21s

Intro
0:00
Distance vs. Displacement
0:04
Distance
0:05
Displacement
0:49
Speed
4:47
Speed
4:48
Instantaneous Speed
6:14
Average Speed
6:40
Velocity
7:25
Distance-Time Graphs
8:21
Distance-Time Graphs
8:22
Acceleration
13:38
Acceleration Definition
13:39
Acceleration Equation
15:23
Positive Acceleration
18:43
Negative Acceleration
18:52
Speed-Time Graphs
20:56
Speed-Time Graphs
20:57
Example 1: Displacement, Distance, and Average Speed
25:15
Example 2: Velocities
28:02
Example 3: Acceleration
28:59
Example 4: Distance and Time
30:19
Example 5: Speed and Time
34:08
Forces

35m 3s

Intro
0:00
Force
0:04
Force Definition
0:05
Net Force
1:44
Balanced Forces
3:06
Unbalanced Forces
4:23
Forces Examples
5:09
Friction
7:53
Friction Definition
7:54
Static Friction
8:23
Sliding Friction
9:35
Rolling Friction
10:11
Fluid Friction
11:13
Air Resistance
12:10
Newton's Laws of Motion
14:06
First Law of Motion
14:07
Inertia
15:56
Newton's Laws Continued
17:13
Second Law of Motion
17:14
Third Law of Motion
18:35
Gravitational Force
24:17
Gravity and Gravitational Force
24:18
Example 1: Horizontal Force, Frictional Force, and Net Force
28:36
Example 2: Net Force and Acceleration
29:38
Example 3: Gravitational Force
30:35
Example 4: Force of Air Resistance and Net Force
32:32
Density & Buoyancy

23m 43s

Intro
0:00
Density
0:05
Definition of Density
0:06
Density = Mass / Volume
1:01
Density of Irregular Objects
3:58
Density of Irregular Objects
3:59
Buoyant Force
7:46
Buoyancy
7:47
Archimedes' Principle
9:23
Floating and Sinking
12:47
Floating and Sinking: Looking at Density
12:48
Example 1: Density of an Object
16:15
Example 2: Density of Yourself
17:28
Example 3: Using Archimedes' Principle to Predict If an Object Will Sink or Float in Water
19:38
Example 4: Will Aluminum, Gold, and Oil Float or Sink When Placed Into Water?
22:06
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Lecture Comments (8)

1 answer

Last reply by: Summer Ebs
Wed Jul 22, 2020 1:38 AM

Post by Oscar Zhou on April 9, 2020

When you are finding the density of yourself, which is mass divided by volume. Is the mass same as the weight? When you put yourself on a scale, will it give me my weight, but not the mass? I remember that the weight is mass multiplied by the gravitational acceleration, so I think that you should divide the weight by the gravitational acceleration to get your mass, is that correct?
 

0 answers

Post by Yisrael Harris on May 5, 2013

I have completed the entire Physical Science course, and I would like to say that I enjoyed it very much.

1 answer

Last reply by: Professor Ebs
Thu May 2, 2013 10:03 PM

Post by Yisrael Harris on May 2, 2013

What if an object's density equals exactly that of water?

0 answers

Post by Saakshi Dhingra on April 14, 2013

Does the temperature of the water affect the weight of the amount of displaced water?

0 answers

Post by shaminder makh on April 6, 2013

very helpful

0 answers

Post by Nathanael Shim on December 7, 2012

wow this lesson is so cool...

Density & Buoyancy

  • Density is the amount of matter in a given amount of space.
  • Density = mass/volume (g/mL) or (g/cm3)
  • Buoyancy is an upward force that keeps things afloat.
  • Archimedes’ principle - A body immersed in a fluid is buoyed up by a force equal to the weight of the displaced fluid.
  • If the weight of water that is displaced by an object in water exceeds the weight of the object then the object will float.
  • If an object is less dense than the fluid in which it is placed, it will float.
  • If it is more dense than the fluid, it will sink.
  • When the volume of an object is LARGER than the mass, the density is less than 1.0 g/cm3

Density & Buoyancy

What is the density of an object that has a mass of 10g and a volume of 10mL?
Density = 1g/mL
If two objects had the same volume, how could you determine which object is more dense?
The object that has more mass is more dense when the volume is the same.
How do you measure the volume of an irregularly shaped object?
Use the water displacement method
What is the volume of an object that causes the water level to rise from 20mL to 25mL when the object is placed in water?
5mL
What is the upward force that keeps things afloat?
Buoyant force
What force depends on your mass and the gravitational acceleration of the Earth?
Weight
According to Archimedes principle, the weight of the water displaced by an object equals what force?
The buoyant force on the object
If the buoyant force is less than the weight of the object, will the object float?
No, the buoyant force must be greater than the weight for the object to float.
What will happen to an object that is more dense than water when you put it into water?
The object will sink
If the mass of the water displaced by an object is 1kg and the gravitational acceleration of the Earth is 9.8 m/s2, will the object that has a weight of 10N float?
No — The weight of the water displaced is 9.8N (mass x gravitational acceleration)

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

Density & Buoyancy

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Density 0:05
    • Definition of Density
    • Density = Mass / Volume
  • Density of Irregular Objects 3:58
    • Density of Irregular Objects
  • Buoyant Force 7:46
    • Buoyancy
    • Archimedes' Principle
  • Floating and Sinking 12:47
    • Floating and Sinking: Looking at Density
  • Example 1: Density of an Object 16:15
  • Example 2: Density of Yourself 17:28
  • Example 3: Using Archimedes' Principle to Predict If an Object Will Sink or Float in Water 19:38
  • Example 4: Will Aluminum, Gold, and Oil Float or Sink When Placed Into Water? 22:06

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