We've got two kilograms of water. The specific heat capacity of water is 4,200 joules per kilogram per degree Celsius (you will be given that value in the exam). The temperature change, in this case, is 80 degrees Celsius (final minus initial; 100 βˆ’ 20). Substituting these values into the equation gives us a change in thermal energy of 672,000 J. We can convert this into kilojoules by dividing it by 1000, giving us an answer of 672 kJ.

Accessibility Commitment

We are committed to making our presentations accessible to everyone. Our platform supports adjustable text size, colour schemes, keyboard navigation, and screen reader compatibility.

Text Appearance Settings

Click the βš™οΈ settings icon to customize your viewing experience:

  • Font Size: Small, Medium, or Large (ideal for visual difficulties)
  • Font Family: Choose from accessible fonts including Atkinson Hyperlegible (designed for dyslexia), Inter, Roboto, and others
  • Letter Spacing: Normal, Wide, or Extra Wide to reduce visual crowding
  • Text Case: Normal, lowercase, First Letter Caps, or UPPERCASE

Colour Schemes

High-contrast options for visual sensitivity and dyslexia support:

  • Yellow on Black (dyslexia-friendly)
  • Black on White (standard high clarity)
  • White on Purple/Green/Blue backgrounds

Narration

Support auditory learners with multiple voice options (Male 1-3, Female 1-3) to help with engagement and comprehension.

Keyboard Shortcuts

β†’ or Space
Next slide
← or Backspace
Previous slide
Home / End
First / Last slide
F / S / N
Fullscreen / Settings / Narration
Esc
Close dialog or exit fullscreen

Additional Features

  • Alternative text for images and ARIA landmarks for screen readers
  • Full keyboard navigation through all content
  • Settings save automatically for your session

πŸ’‘ Tip: Every learner is different. Explore the settings to find what works best for you, and don't hesitate to try different combinations.

If you encounter any accessibility barriers or have suggestions for improvement, please contact us:

Email: [email protected]