C408 - Purity

What is the correct equation to calculate purity?

• Purity = mass of impure product - mass of pure product x 100
• Purity = mass of impure product / mass of pure product x 100
• Purity = mass of pure product / mass of impure product x 100
• Purity = mass of pure product + mass of impure product x 100

What is the correct equation to determine the mass of salts in a sample of seawater?

• Mass of salt = mass of seawater x 1
• Mass of salt = mass of seawater x 0.35
• Mass of salt = mass of seawater x 0.68
• Mass of salt = mass of seawater x 0.035

What is the purity of silver marked 800?

• 100%
• 80%
• 3.5%
• 800%

What is the purity of silver marked 800 if the mass of the impure product is 100 g?

• 80.5%
• 75%
• 100%
• 80%

What is the purity of silver marked 925?

• 925%
• 100%
• 75%
• 92.5%

What is the correct equation to calculate purity if the mass of the pure product is 10 g and the mass of the impure product is 40 g?

• Purity = 40 / 10 x 100
• Purity = 10 / 40 x 100
• Purity = 10 + 40 x 100
• Purity = 40 - 10 x 100

]What is meant by pure?

• A substance with a low concentration of one element
• A substance with no impurities
• A substance with multiple elements
• A substance with a high concentration of one element

How is purity calculated?

• Dividing the mass of the pure product by the mass of the impure product and multiplying by 100
• Subtracting the mass of the impure product from the mass of the pure product and multiplying by 100
• Dividing the mass of the impure product by the mass of the pure product and multiplying by 100
• Adding the mass of the pure product and the mass of the impure product and multiplying by 100

What is the purity of 12 carat gold?

• 12%
• 100%
• 50%
• 75%

What is the correct equation to calculate purity if the mass of the pure product is 25 g and the mass of the impure product is 50 g?

• Purity = 50 / 25 x 100
• Purity = 25 + 50 x 100
• Purity = 50 - 25 x 100
• Purity = 25 / 50 x 100