The half-life of radium-226 is 6400 years. If I have 6750 g after 25,000 years, how much radium-226 did I have in my original sample when I started? I had___g in my original sample. Record your answer to the nearest whole number

Humans effect earth in many ways. The use of fossil fuels, the clear-cutting of forest, and controlled burns can affect the carbon cycle

Which of the following is a physical property of a substance in the liquid state? a. definite volume b. indefinite mass c. easily compressed d. definite shape

Which is a characteristic of mixtures? A. They are chemically bonded together. B. They can be classified as pure substances. C. They have fixed ratios between their components. D. They can be separated by physical processes.

What is a key difference between an electrolytic cell and a voltaic cell? The anode is where the oxidation takes place. The cathode is where the reduction takes place. There are two half-reactions. There is an outside energy source.

What happens when all forces are unequal?

What can form as a result of a chemical reaction?

A solution of orange juice that weighs 500 g contains liquid juice and solid pulp. All of the pulp is removed from the juice. The pulp is found to weigh 50 g. How much would the remaining liquid juice weigh? A. 50 g B. 250 g C. 450 g D. 500 g

Assume 3 molecules of Fe react according to the following equation. 3Fe + 4H2O Fe3O4 + 4H2 How many molecules of H2 are produced? How many water molecules are required? What is the mole ratio of Fe to H2O?

10.0 mL of a HF solution was titrated with a 0.120 N solution of KOH; 29.6 mL of KOH were required to completely neutralize the HF. Calculate the normality of the HF solution.

The number of grams present in 1.35 mol of Fe is