Скачать или смотреть Density and derived units

*CORE CONCEPT:*
Density is defined as mass per unit volume, calculated using the formula density = mass/volume. Understanding this concept is essential for solving problems related to mass and volume.

*TOPICS COVERED:*
When to use the formula density = mass/volume (B1)
How to convert between grams and kilograms for mass
How to convert between cm³ and mL for volume
When to rearrange the formula to find mass or volume

*EXAMPLE SENTENCES:*
Example 1: Density = 3g/cm³, Volume = 4cm³ → Mass = Density × Volume = 3g/cm³ × 4cm³ = 12g.
Example 2: Density = 1.5g/cm³, Mass = 9g → Volume = Mass/Density = 9g / 1.5g/cm³ = 6cm³.
Example 3: A metal block has a mass of 20g and a volume of 10cm³. Find its density. Density = Mass/Volume = 20g / 10cm³ = 2g/cm³.

*GRAMMAR RULES:*
Identify the mass and volume of the object → Use the formula density = mass/volume.
If required, rearrange the formula → Use mass = density × volume or volume = mass/density.

*COMMON ERRORS:*
Wrong: Using the formula incorrectly, like saying density = volume/mass. → Right: Always remember the correct formula: density = mass/volume.
Wrong: Confusing units, such as using kg instead of g for mass. → Right: Check that mass is in grams and volume in cm³ before calculating.
Wrong: Not converting volumes correctly from cm³ to mL when needed. → Right: If you need to convert units, do it before applying the formula for accurate results.

*STUDENT QUESTIONS:*
How do I calculate density?
When to use the density formula?
Is this example of density calculation correct?
What's the difference between mass and volume?
How do I convert cm³ to mL?

*KEY CONCEPTS:*
Density, mass, volume, grams, cm³, B1, derived units, calculations, conversions.