1. Fluorine-21 has a half-life of approximately 5 seconds. How much of a 200 gram sample would remain after 1 minute.

What particle is emitted when lead-214, 214 82 pb undergoes natural radioactive decay to bismuth-214, 214 83 bi?

Use Dalton's atomic theory to explain what is happening to the carbon atoms when a diamond is burned and to oxygen and hydrogen atoms when water is electrolyzed.

Which of the following is a compound? A. H2O B. C C. Ca

The SI unit of weight is the same as that of force. What does this tell us about weight? Explain. What is the biggest force this force meter can measure? How big is the force lifting this stool? .

How many neutrons are in a typical silicon atom? A. 15 B. 14 C. 28 D. 42

Which question can be answered using the scientific method? A) Which dog food is best for healthy teeth? B) What color is the most attractive? C) What is my purpose in life? D) Which flower smells the best?

For the galvanic cell reaction, expressed below using shorthand notation, what half-reaction occurs at the cathode?

Explain how do you would count the sig figs in the following number, 0.00340670, and what is the answer?

Choose the best answer to each question. Which has the most kinetic energy? a bowling ball with a velocity of 1.5 m/s Or a golf ball with a velocity of 0.5 m/s

Acid indigestion is sometimes neutralized with an antacid such as magnesium hydroxide (Mg (OH) 2). What products will be released when the antacid is mixed with the hydrochloric acid in the stomach