Meaning of hypotheis

Is sand biotic or abiotic

The characteristc bright line spectrum of an atom is produced by 1. Electrons absorbing quanta 2. Electrons emitting quanta 3. Protons absorbing quanta 4. Protons emitting quanta

The semi-conductors on the periodic table are classified as

How many grams of K2CO3 would you need to put on the spill to neutralize the acid according to the following equation? 2HBr (aq) + K2CO3 (aq) →2KBr (aq) + CO2 (g) + H2O (l)

What are the limitations of descriptive investigations

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?