If an element has a half life of one million years, how long will it take to be completely gone

After visiting a factory on a field trip, your little sister Elsa is really concerned about her carbon footprint. Name two ways that she can reduce her carbon footprint at home.

what action forms a different chemical substance? A. crushing a rock B. burning a piece of wood C. mixing salt and pepper D. melting an ice cube

Formula for distance

As 0.1M HCl is added to 0.1M KOH, then pH of the basic solution A. decreases and basicity decreases B. increases and basicity decreases C. decreases and basicity increases D. increases and basicity increases

The scientists who have contributed to our current body of knowledge were from what part of the world? O O O A. Only the United States B. All areas of the world c. Mostly Europe O D. Mostly the Middle East

If 6 moles of a compound produce 84 J of energy, what is the a Hreaction in J/mol?

If you were traveling through space and landed on a different planet, how might your mass and weight compare to their values on Earth? Why?

Which principle explains why it is necessary to have safety belts in cars?

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

Which of the following represents a chemical change? Bending a wire Freezing of water Fireworks exploding Melting of a wax candle