Videos [1–100 of 22892 videos]
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02:04Identifying the Reflected Ray for a Given Incident Ray in 3D
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01:56
Understanding How to Measure the Angle of Incidence
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02:02
Identifying the Reflected Ray for a Given Incident Ray
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03:09
Finding the Area of a Triangle between Parallel Lines
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03:26
Estimating Using a Cumulative Frequency Graph
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03:53
Identifying a Correct Statement Using Geometric Properties
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02:45
Finding Lengths Using the Properties of Parallel Lines
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01:40
Determining If a Given Sample Is a Simple Random Sample
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02:31
Identifying Why Something Is Not a Simple Random Sample
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01:21
Identifying the Types of Lines
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01:20
Finding the Modal Class in a Histogram
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01:53
Describing the Characteristics of a Nonconformity
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01:43
Identifying Biogenic Rocks
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01:50
Describing the Lithosphere
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02:16
Determining the Congruency of Triangles
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01:28
Describing Seismic Waves
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01:43
Describing the Asthenosphere
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01:07
Measuring Earthquake’s Magnitude
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01:40
Describing the Formation of the Hydrosphere
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01:49
Determining the Physical States of Earth’s Layers
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02:02
Describing Primary Geological Structures
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01:55
Completing a Frequency Table Using Tally Marks
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02:09
Understanding the Difference between Mineral Color and Mineral Streak
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01:34
Understanding the Aim of Ecology
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02:01
Finding the Probability of a Compound Event Using an Experiment
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02:34
Identifying Minerals Used in Ornaments in Ancient Egypt
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11:53
Matter and Density
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13:37
Atoms, Elements, and Compounds
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03:03
Stating the Correct Procedure for Viewing a Specimen under a Microscope
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02:25
Identifying a Behavioral Adaptation of Chameleons
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01:45
Identifying Which Animal Undergoes Estivation during Hot Summers
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02:05
Understanding How Types of Organisms Obtain Energy
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02:55
Simplifying an Expression Involving Surds
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09:40
Mechanical Energy
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13:05
Covalent Bonds
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00:57
Recalling the Names of Compounds Formed from Iron Atoms with a Valence of 2
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02:19
Finding the Area of a Triangle between Parallel Lines
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03:17
Translating a Shape on a Grid
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01:32
Describing Earth’s Outer Core
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01:21
Naming the Non-Native-Element Mineral
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01:39
Identifying the Problem with Mendeleev’s Periodic Table with respect to Isotopes
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11:20
Wave Speed
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08:14
Transverse and Longitudinal Waves
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01:06
Finding an Angle Using Congruence
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01:53
Distinguishing a Diagram of a Covalent Compound from Diagrams Depicting a Noble Gas, a Salt, and a Metal
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02:33
Identifying Whether a Line Is a Line of Symmetry
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15:27
Chemical Properties of Metals and Nonmetals
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02:22
Understanding the Salinities of Different Seas
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02:38
Identifying the Incorrect Statement regarding the Importance of Earth’s Atmosphere
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01:30
Depositing Grains 62 𝜇m–2 mm in Size
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11:36
Weight
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01:56
Identifying the Part of a Distillation Column with the Highest Temperature
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14:40
Oscillatory Motion
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01:30
Identifying the Dot-and-Cross Diagram That Correctly Depicts a Chlorine Molecule
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01:49
Understanding Economic Value
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01:33
Identifying the Molecule Containing Four Shared Electrons from Five Given Molecules
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01:53
Finding the Diameter of a Sphere from Its Volume
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01:07
Determining the Number of Outer-Level Electrons of an Inert Gas
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01:02
Identifying the Correct Statement regarding the Reaction of Nonmetals with Acids and Oxygen
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01:34
Placing Pyroxene
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15:04
Determinant of a Triangular Matrix
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16:05
Scalars, Vectors, and Directed Line Segments
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15:13
Solving Systems of Linear Equations Graphically
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15:44
Applying the Pythagorean Theorem to Pyramids and Cones
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12:43
Resultant of Coplanar Forces
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00:49
Translating a Point Using a Vector
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15:11
Characteristics of Matter
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00:47
Recalling Which Element Has the Chemical Symbol K
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02:42
Translating a Triangle Using Congruent Triangles
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01:01
Determining the Product of the Reaction between Oxygen and a Species Represented by Its Lewis Structure
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01:03
Identifying the Molecule That Has the Greatest Number of Elements
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01:24
Identifying the Property That Can Be Determined by Heating Ice in a Water Bath
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01:27
Identifying the Polyatomic Ion with a Valence of Two from a Given List of Names
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02:21
Identifying a Given Translation
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15:41
Valence
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00:40
Identifying the Most Reactive Metal from a List of Five Metals
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01:03
Recalling Which Particle’s Number in the Nucleus of an Atom the Elements in the Modern Periodic Table Are Arranged By
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00:48
Recalling the Chemical Symbol of Lithium
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01:38
Understanding Why Heat Is Necessary for Carbon and Oxygen to React
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01:23
Matching the Given Acids and Bases with Their Chemical Formulas
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02:01
Identifying Methods for Protecting Metals from Rust
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02:45
Identifying What Changes When an Atom Forms a Positive Ion
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02:09
Identifying a Translation
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00:54
Determining the Valence of Lithium Using Its Group Number
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01:06
Determining the Valence of Helium Using a Given Portion of the Periodic Table
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02:37
Constructing Congruent Angles
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04:34
Using Properties of Parallel Lines and Transversals to Find Congruent Angles
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02:14
Simplifying the Multiplication and Division of Multiple Cube Roots
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02:06
Expressing a Cube Root in its Simplest Form
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00:56
Using Properties of Parallel Lines, Transversals, and Congruent Angles
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03:02
Simplifying the Addition of Cube Roots
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01:00
Simplifying the Multiplication of Two Cube Roots
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04:51
Using Properties of Parallel Lines and Transversals to Find the Measure of a Given Angle
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01:47
Explaining the Change in Mass When a Bottle of Soda Is Left Open
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00:56
Identifying the Typical Charge of Halides
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00:55
Describing the Attraction between the Ions of an Ionic Bond
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01:29
Identifying Which Statement Correctly Describes Mass Being Conserved during a Chemical Reaction
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01:36
Determining Which Two Types of Elements Form an Ionic Compound
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01:14
Identifying the Image That Represents Bromine at Room Temperature and Standard Pressure
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01:54
Identifying Which Household Items Contain Acids and Which Contain Alkalis
