Videos [1–100 of 22892 videos]

02:04
Identifying the Reflected Ray for a Given Incident Ray in 3D

01:56
Understanding How to Measure the Angle of Incidence

02:02
Identifying the Reflected Ray for a Given Incident Ray

03:09
Finding the Area of a Triangle between Parallel Lines

03:26
Estimating Using a Cumulative Frequency Graph

03:53
Identifying a Correct Statement Using Geometric Properties

02:45
Finding Lengths Using the Properties of Parallel Lines

01:40
Determining If a Given Sample Is a Simple Random Sample

02:31
Identifying Why Something Is Not a Simple Random Sample

01:21
Identifying the Types of Lines

01:20
Finding the Modal Class in a Histogram

01:53
Describing the Characteristics of a Nonconformity

01:43
Identifying Biogenic Rocks

01:50
Describing the Lithosphere

02:16
Determining the Congruency of Triangles

01:28
Describing Seismic Waves

01:43
Describing the Asthenosphere

01:07
Measuring Earthquake’s Magnitude

01:40
Describing the Formation of the Hydrosphere

01:49
Determining the Physical States of Earth’s Layers

02:02
Describing Primary Geological Structures

01:55
Completing a Frequency Table Using Tally Marks

02:09
Understanding the Difference between Mineral Color and Mineral Streak

01:34
Understanding the Aim of Ecology

02:01
Finding the Probability of a Compound Event Using an Experiment

02:34
Identifying Minerals Used in Ornaments in Ancient Egypt

11:53
Matter and Density

13:37
Atoms, Elements, and Compounds

03:03
Stating the Correct Procedure for Viewing a Specimen under a Microscope

02:25
Identifying a Behavioral Adaptation of Chameleons

01:45
Identifying Which Animal Undergoes Estivation during Hot Summers

02:05
Understanding How Types of Organisms Obtain Energy

02:55
Simplifying an Expression Involving Surds

09:40
Mechanical Energy

13:05
Covalent Bonds

00:57
Recalling the Names of Compounds Formed from Iron Atoms with a Valence of 2

02:19
Finding the Area of a Triangle between Parallel Lines

03:17
Translating a Shape on a Grid

01:32
Describing Earth’s Outer Core

01:21
Naming the NonNativeElement Mineral

01:39
Identifying the Problem with Mendeleev’s Periodic Table with respect to Isotopes

11:20
Wave Speed

08:14
Transverse and Longitudinal Waves

01:06
Finding an Angle Using Congruence

01:53
Distinguishing a Diagram of a Covalent Compound from Diagrams Depicting a Noble Gas, a Salt, and a Metal

02:33
Identifying Whether a Line Is a Line of Symmetry

15:27
Chemical Properties of Metals and Nonmetals

02:22
Understanding the Salinities of Different Seas

02:38
Identifying the Incorrect Statement regarding the Importance of Earth’s Atmosphere

01:30
Depositing Grains 62 𝜇m–2 mm in Size

11:36
Weight

01:56
Identifying the Part of a Distillation Column with the Highest Temperature

14:40
Oscillatory Motion

01:30
Identifying the DotandCross Diagram That Correctly Depicts a Chlorine Molecule

01:49
Understanding Economic Value

01:33
Identifying the Molecule Containing Four Shared Electrons from Five Given Molecules

01:53
Finding the Diameter of a Sphere from Its Volume

01:07
Determining the Number of OuterLevel Electrons of an Inert Gas

01:02
Identifying the Correct Statement regarding the Reaction of Nonmetals with Acids and Oxygen

01:34
Placing Pyroxene

15:04
Determinant of a Triangular Matrix

16:05
Scalars, Vectors, and Directed Line Segments

15:13
Solving Systems of Linear Equations Graphically

15:44
Applying the Pythagorean Theorem to Pyramids and Cones

12:43
Resultant of Coplanar Forces

00:49
Translating a Point Using a Vector

15:11
Characteristics of Matter

00:47
Recalling Which Element Has the Chemical Symbol K

02:42
Translating a Triangle Using Congruent Triangles

01:01
Determining the Product of the Reaction between Oxygen and a Species Represented by Its Lewis Structure

01:03
Identifying the Molecule That Has the Greatest Number of Elements

01:24
Identifying the Property That Can Be Determined by Heating Ice in a Water Bath

01:27
Identifying the Polyatomic Ion with a Valence of Two from a Given List of Names

02:21
Identifying a Given Translation

15:41
Valence

00:40
Identifying the Most Reactive Metal from a List of Five Metals

01:03
Recalling Which Particle’s Number in the Nucleus of an Atom the Elements in the Modern Periodic Table Are Arranged By

00:48
Recalling the Chemical Symbol of Lithium

01:38
Understanding Why Heat Is Necessary for Carbon and Oxygen to React

01:23
Matching the Given Acids and Bases with Their Chemical Formulas

02:01
Identifying Methods for Protecting Metals from Rust

02:45
Identifying What Changes When an Atom Forms a Positive Ion

02:09
Identifying a Translation

00:54
Determining the Valence of Lithium Using Its Group Number

01:06
Determining the Valence of Helium Using a Given Portion of the Periodic Table

02:37
Constructing Congruent Angles

04:34
Using Properties of Parallel Lines and Transversals to Find Congruent Angles

02:14
Simplifying the Multiplication and Division of Multiple Cube Roots

02:06
Expressing a Cube Root in its Simplest Form

00:56
Using Properties of Parallel Lines, Transversals, and Congruent Angles

03:02
Simplifying the Addition of Cube Roots

01:00
Simplifying the Multiplication of Two Cube Roots

04:51
Using Properties of Parallel Lines and Transversals to Find the Measure of a Given Angle

01:47
Explaining the Change in Mass When a Bottle of Soda Is Left Open

00:56
Identifying the Typical Charge of Halides

00:55
Describing the Attraction between the Ions of an Ionic Bond

01:29
Identifying Which Statement Correctly Describes Mass Being Conserved during a Chemical Reaction

01:36
Determining Which Two Types of Elements Form an Ionic Compound

01:14
Identifying the Image That Represents Bromine at Room Temperature and Standard Pressure

01:54
Identifying Which Household Items Contain Acids and Which Contain Alkalis