How many photons are produced in a laser pulse of 0.682 J at 649 nm?

Burning logs in the fire place produce heat energy. The dog gets warm from the fire when heat energy is transferred by A) the air. B) radiation. C) conduction. D) the flames.

The element X has 2 valence electrons. its is a

A piece of wood has a density of 0.93 g/mL and a mass of 23 g what is the volume?

Convert 182 lbs to grams

The specific heat of a certain type of metal is 0.128 J / (g ⋅ ∘ C). What is the final temperature if 305 J of heat is added to 93.4 g of this metal, initially at 20.0 ∘ C?

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?