True or false: The mass of 1 mole of lithium is 6.94 grams.

What was a significant shortcoming of Rutherford's model of the atom? A. It could not explain the chemical properties of elements. B. It applied only to gold, not other elements. C. It was based on faulty evidence. D.

How many moles of ammonium ions are in 6.975 g of ammonium carbonate?

Enter the expression 147N+α, where α is the lowercase Greek letter alpha. Express your answer as a chemical expression.

If 0.78% of a radioactive substance remains, then how many half-lives have passed? 3 7 6 4

Consider these changes. (a) Hg (l) - >Hg (g) (b) 3O2 (g) - >2O3 (g) (c) CuSo4*5H2O (s) - >CuSO4 (s) + 5H2O (g) (d) H2 (g) + F2 (g) - >2HF (g) At constant pressure, in which of the reactions is work done by the system on the surroundings?

The vapor pressure of 10 mL of ethanol at 20C is 5.85 kPa. What is the vapor pressure of 20 mL of ethanol at the same temperature?

How do you express 0.00026 in scientific notation

All organisms need instructions to specify their traits. The instructions, or code, that is responsible for all the inherited traits of an organism.

1. Are state changes chemical or physical changes? Provide an example of a state change and explain why it is a chemical or physical change.

What is the morality of a 750.0 milliliter solution containing 2.5 miles of solute?