About how long does it take earth to complete one revolution around the sun

The number of water molecules present in a drop of water at room temperature

Compare how an increase in wavelength affects sounds and light waves.

2 grams of a substance was dissolved in 75.0 g of water resulting in a temperature decrease from 23.1 ⁰C to 18.7 ⁰C. The specific heat of the solution is 4.18 J/g·⁰C. Calculate the amount of heat associated with the water.

Which of the following is the best definition of a scientific theory? A predicted experimental outcome A mathematical model (an equation) A prediction of how a natural phenomenon will behave A well tested explanation of a natural phenomenon

Which hypothesis of Thomson's atomic model was later found to be not true by Niels Bohr and why?

What happens to the electronegativity as you go from Lithium to Francium? Why?

Which of the following is true for all chemical reactions? The total mass of the reactants increases. The total mass of the reactants equals the total mass of the products.

Is the osmotic pressure of a 0.10 M solution of NaCl greater than, less than, or equal to that of a 0.10 M solution of KBr? a. equal tob. greater thanc. less thand. insufficient information

What are the metalloids on the periodic table?

Which of these answers best describe a fossil?