flexbooks.ck12.org

Huvudinformation

ℹ️

Titel: K-12 FlexBooks | CK-12 Foundation

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

Nyckelord: empty

Sidkodning: utf-8

Sidans filstorlek: 296 KB

Serverinformation

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IP: 3.164.68.58

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

Http-server: apache/2.4.58 (ubuntu)

Kodning: utf-8

Metataggar lista

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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/

Interna länkar

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Externa länkar

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Whois information

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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 Raw Data

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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 revision

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Teknisk SEO

✓

Svarskod

200

Status 200 OK - sidan laddas korrekt.

✓

Teckenkodning

Page: utf-8, Header: utf-8

Teckenkodning konsekvent mellan HTML och rubriker.

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Sidstorlek

303246 bytes

Sidstorlek acceptabel för snabb laddning.

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Resurser

109 total

För många resurser. Optimera och kombinera filer för bättre prestanda.

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Hreflang Taggar

0 hreflang tags

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Robots.txt

Missing

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Sitemap

Not found

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HTTPS

Yes

Säker HTTPS-anslutning aktiverad.

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Kompression

gzip

Gzip eller Zstd-komprimering aktiverad för snabbare laddning.

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Cachning

Not set

Lägg till cache-kontrollrubriker för att förbättra laddningshastigheten för återkommande besökare.

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Sidhastighet

2.64 ms

Utmärkt lastningshastighet.

On-Page SEO

✓

Titel

K-12 FlexBooks | CK-12 Foundation

Bra titellängd (30-60 tecken).

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Metabeskrivning

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

Bra metabeskrivningslängd (100-160 tecken).

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H1 Rubrik

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

Använd endast en H1-rubrik per sida. Ta bort extra H1-taggar.

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Ordräkning

202

Innehållet är väldigt kort. Sikta på minst 500 ord för bättre SEO.

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Kanonisk Tag

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Duplicera Meta

[]

Inga dubbletter av metataggar hittades.

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Nyckelord

empty

Meta nyckelord inställda (obs: används inte av stora sökmotorer).

Innehåll och UX

✓

Språk

en

Språkattributet är korrekt inställt.

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Bilder

67 total, 51 missing ALT

Lägg till ALT-text till bilder för tillgänglighet och SEO.

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Viewport

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

Viewport-metatagg korrekt inställd för mobila enheter.

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Öppna Graph

Missing: og:title, og:image

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Strukturerad data

1 JSON-LD scripts

Strukturerad data (JSON-LD) hittades.

Sökfraser - Google

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Placera	Fras	Sida	Utdrag
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.

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