flexbooks.ck12.org

Belangrijkste informatie

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Titel: K-12 FlexBooks | CK-12 Foundation

Beschrijving: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks.

Trefwoorden: empty

Paginacodering: utf-8

Pagina Bestandsgrootte: 296 KB

Serverinformatie

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IP: 3.164.68.58

Locatie: United States,US,,,37.751,-97.822,America/Chicago

Http-server: apache/2.4.58 (ubuntu)

Codering: utf-8

Lijst metatags

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property: og:site_name itemprop: name name: author content: CK-12 Foundation
property: fb:app_id content: 159884644067996
itemprop: url content: https://www.ck12.org
itemprop: telephone content: (650) 494-1302
charset: utf-8
name: viewport content: width=device-width, initial-scale=1, minimum-scale=1.0
name: google-site-verification content: wHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
name: google-translate-customization content:
name: application-name content: CK-12 Foundation
name: msapplication-TileColor content: #003300
name: msapplication-TileImage content: //static.ck12.org/assets/favicon/web-app-manifest-192x192.png
property: og:description name: description content: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. helmet: true
property: og:url content: https://flexbooks.ck12.org/flexbooks/student/
itemprop: provider content: CK-12 Foundation
itemprop: name
itemprop: description
itemprop: url content: https://flexbooks.ck12.org/flexbooks/student/

Interne koppelingen

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Externe koppelingen

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Whois-informatie

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domain_name: ck12.org

update_date: 2025-08-07T22:10:54.892Z

update_time: 1754604654

creation_date: 2006-12-16T08:37:03.681Z

creation_time: 1166258223

expiration_date: 2028-12-16T08:37:03.681Z

Whois onbewerkte gegevens

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            Domain Name: CK12.ORG
Registrar: Amazon Registrar, Inc.
Domain Status: client delete prohibited
Domain Status: client transfer prohibited
Domain Status: client update prohibited
Registry Expiry Date: 2028-12-16T08:37:03.681Z
Creation Date: 2006-12-16T08:37:03.681Z
Updated Date: 2025-08-07T22:10:54.892Z
Name Server: NS-1136.AWSDNS-14.ORG
Name Server: NS-161.AWSDNS-20.COM
Name Server: NS-1687.AWSDNS-18.CO.UK
Name Server: NS-977.AWSDNS-58.NET
REGISTRAR Contact: Amazon Registrar, Inc.
>>> Last update of RDAP database: 2026-02-16T21:03:58Z

SEO-audit

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Technische SEO

✓

Reactiecode

200

Status 200 OK - pagina wordt correct geladen.

✓

Tekencodering

Page: utf-8, Header: utf-8

Tekencodering consistent tussen HTML en headers.

✓

Paginagrootte

303246 bytes

Paginaformaat acceptabel voor snel laden.

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Bronnen

109 total

Te veel middelen. Optimaliseer en combineer bestanden voor betere prestaties.

✓

Hreflang-tags

0 hreflang tags

Voeg hreflang-tags toe als u meertalige inhoud heeft.

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Robots.txt

Missing

Voeg het robots.txt-bestand toe om het crawlen van zoekmachines te controleren.

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Sitemap

Not found

Voeg sitemap.xml toe en verwijs ernaar in robots.txt.

✓

HTTPS

Yes

Beveiligde HTTPS-verbinding ingeschakeld.

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Compressie

gzip

Gzip- of Zstd-compressie ingeschakeld voor sneller laden.

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Caching

Not set

Voeg cache-control headers toe om de laadsnelheid voor terugkerende bezoekers te verbeteren.

✓

Paginasnelheid

2.64 ms

Uitstekende laadsnelheid.

SEO op de pagina

✓

Titel

K-12 FlexBooks | CK-12 Foundation

Goede titellengte (30-60 tekens).

✓

Metabeschrijving

CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. Lenght:152

Goede lengte van de metabeschrijving (100-160 tekens).

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H1-rubriek

2 found - "Interact with Your Math & Science Textbooks in a Whole New Way"

Gebruik slechts één H1-kop per pagina. Verwijder extra H1-tags.

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Aantal woorden

202

Inhoud zeer kort. Streef naar minimaal 500 woorden voor betere SEO.

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Canonieke tag

Voeg een canonieke tag toe om problemen met dubbele inhoud te voorkomen.

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Dubbele meta

[]

Geen dubbele metatags gevonden.

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Trefwoorden

empty

Meta-trefwoorden ingesteld (let op: niet gebruikt door grote zoekmachines).

Inhoud en UX

✓

Taal

en

Taalkenmerk correct ingesteld.

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Afbeeldingen

67 total, 51 missing ALT

Voeg ALT-tekst toe aan afbeeldingen voor toegankelijkheid en SEO.

✓

Kijkpoort

width=device-width, initial-scale=1, minimum-scale=1.0

Viewport-metatag correct ingesteld voor mobiele apparaten.

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Grafiek openen

Missing: og:title, og:image

Voeg ontbrekende OpenGraph-tags toe voor het delen op sociale media:og:title, og:image

✓

Gestructureerde gegevens

1 JSON-LD scripts

Gestructureerde gegevens (JSON-LD) gevonden.

Zoek zinnen - Google

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Positie	Zin	Pagina	Fragment
3	k e q	/cbook/ck-12-chemist...	Equilibrium Constant (Keq) The equilibrium constant (Keq ) is the ratio of the mathematical product of the concentrations of the products of a reaction to the mathematical product of the ...
7	write 6 6 3 4	/cbook/ck-12-cbse-ma...	Divisibility Rules for 2, 3, 4, 5, 6, 8, 9, 10 and 11 A number is divisible 6 if it is divisible by both 2 and 3 . Example of divisibility rule for 6 : Consider the number 47394. Since its units digit is 4 , it is ...
9	types of energy	/cbook/cbse-physics-...	Forms of Energy - Defintion, Types, Formula, Examples ... The six forms of energy include mechanical, chemical, electrical, light, thermal, and sound energy . Another form of energy is nuclear energy.
12	science models	/cbook/ck-12-middle-...	Scientific Models Models allow scientists to work with systems that are nearly impossible to study as a whole. Models help scientists to understand these systems.
14	write the time using words	/cbook/ck-12-first-g...	Time Conversion between Words and Numbers We are going to learn how to write down the time in digits (numbers). ... The most common way to express time in words is just to say the time in the form HOUR ...
22	us class us	/user:coachtgj/cbook...	The American Class System Most sociologists use six class divisions when describing the American class system. Because it is an open system, people are able to move between classes.
22	date mark time 40 minutes	/cbook/ck-12-middle-...	Elapsed Time Elapsed time is the amount of time that has passed between two events. You can calculate the elapsed time by figuring out the difference between the start and ...
26	complete a square	/cbook/ck-12-algebra...	Completing the Square When the Leading Coefficient ... Step 1: Write the polynomial so that and are on the left side of the equation and the constants on the right. Step 2: Pull out from everything on the left side.

Aanvullende diensten

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