Is a pencil breacking a physical change?

Why does gas take the shape and volume on its container

4) 4 NH3 + 3 O2  2 N2 + 6 H2O a. Write the mole ratio for NH3 to N2 b. Write the mole ratio for H2O to O2

If 26.25 ml of 0.1850 m naoh solution reacts with 25.00 ml of h2so4, what is the molarity of the acid solution?

For each reaction, calculate how many moles of the barium product you will produce using stoichiometry and the balanced reactions.

In the laboratory how could you determine if a solid as an ionic or metallic bond

A fog over a lake. what two changes of state must occur to produce the fog? do the water molecules absorb or release energy during these changes of state? what happens to the motion of the water molecules as a result?

Limes have a [H3O+] of 1.3 x 10-2 mol/L. Their pOH is

The human body is 0.0040% iron. How many milligrams of iron does a 165 pound person contain?

Which of the following is the correct Lewis structure for ammonia (NH3) ? Note: Hydrogen and nitrogen have one and five valence electrons respectively.

Which of the following statements is true? A. Particles of a solid have a very orderly, three dimensional arrangement and do not move B. Particles of a liquid change shape and volume C.