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