How do you know if a equation is balanced or unbalanced

How many milliliters of 0.100 M Ba (OH) 2 are required to neutralize 20.0 mL of 0.250 M HCl?

you have a rock, a jug of water and a bucket. you place the rock in the bucket and then pour the water over it. what change of shape would you expect to find and why?

Which of the following are chemicals? (1) clothing (2) food (3) fuels (4) all of the above

What happens if you remove electrons from a neutral object?

Which of the following observations likely describes a physical change?

How many resonance structures can be drawn for N2O5 (no N-N bond) (minimal formal charge) ?

A beaker contains nickel (ii sulfate, zinc (ii sulfate and solid iron. what species in this beaker will be reduced?

An initial mixture of nitrogen gas and hydrogen gas is reacted in a rigid container at a certain temperature as follows: 3 H2 (g) + N2 (g) equilibrium reaction arrow 2 NH3 (g). At equilibrium, the concentrations are [H2] = 5.6 M, [N2] = 9.

An experiment shows that a 115 mLmL gas sample has a mass of 0.169 gg at a pressure of 700 mmHgmmHg and a temperature of 30 ∘C∘C. What is the molar mass of the gas?

You are given a mixture of sand, iron nails, and salt water. devise a plan for separating this mixture. identify how you will separate each part of the mixture, and the physical properties that allow you to do this.