The half-life of a radioactive isotope is 20.0 minutes. What is the total amount of a 1.00-gram sample of this sample of this isotope remaining after 1.00 hour?

Given the law of conservation of energy, what happens when a 200°C iron bar is placed in thermal contact with a 30°C block of wood?

Which of these is not a covalent molecule? 1. F2 2. CO 3. LiF 4. NH3

Convert 44 centimeters to meters. A. 4 m B. 4.4 m C. 0.44 m D. 0.044 m

19. What is the most significant factor that controls the development of soil? A. Time B. Climate C. Parent material D. Topography

Which of the following is true about all electromagnetic waves in a vacuum? a. they all carry the same energy. b. they all travel at the same speed. c. they all have the same frequency. d. the all have the same wavelength.

A friend says that temperature increases altitude increases becauses you're moving towards the sun. Is this true? Explain.

Zinc put in concertrated sodium hydroxide

how do geologists use seismic waves to locate an earthquakes epicenter

Which formula id correctly paired with its name? A. MgSO↓ = magnesium chlorine B. FeO = iron (|||) oxide C. K↓2O = Phosphorus dioxide D. CuCI↓2 = copper (||) chloride

Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). you measure the amount and determine that there are 5 grams of potassium-40 in the rock.