In the reaction shown below, how many moles of hydrogen are produced when 10 moles of potassium
react with water?
2 K + 2 H2O -> 2 KOH + H2
• 2.5 moles
• 5 moles
• 10 moles
• 20 moles

Rarefaction is used for which of the following? a. creating a representative sample b. studying how disease impacts populations c. rediscovering species thought to be instinct d. determining which sea creatures live in an area

What does the number 18.9984 represent in the image?

What is the volume of a book that has a width of 10 cm a length that is 2 times the width and a height that is half they would remember to express your answer in keeping units