5/3if 87.5 percent of a sample of pure 131 i decays in 24 days, what is the half-life of 131 i?

A crucible contains 6.4 g of copper, Cu. How many moles does this amount contain? [Given: Cu=64]

How do you know that Al (OH) 3 (s) is a base?

The substance which dissolves the particles of a solution is called the.

Which of the chemical would be the most effective for melting ice in the winter? explain

A 50.0 mL sample of 1.54*10-2 M NaSO4 is added to 50.0 mL of 1.28*10-2 Ca (NO3) 2. What percentage of the Ca2 + remains unprecipitated?,

Transport means to move something from one place to another. True False

What are two reasons that ocean water sinks in the Arctic Ocean? A. The surface water is warmer and less salty than normal. B. The surface water is warmer and more salty than normal. C. The surface water is colder and less salty than normal. D.

Which statement best describes the conductivity of weak electrolytes, such as weak acids and bases? A) Weak electrolytes do not dissolve in water and can not conduct electricity.

Two speakers are placed side by side and are described as having constructive interference. How do you know when constructive interference of sound waves has occurred?

Write about "human impact"