Mass does not change during a chemical change. is the same true for physical change?

What's something that describes diffusion

Based on the law of multiple proportions, how many grams of hydrogen would you expect 3.04 g of nitrogen to combine with to yield ammonia?

How are the particles in this model different from real gas particles

The reaction of hydrogen gas and iron oxide is described by the chemical equation below. 3H2+Fe2O3→2Fe+3H2O How many moles of iron will be produced if 3.3mol of hydrogen gas reacts with 1.5mol of iron oxide?

Is it C? Which of the following materials contains components in a fixed ratio? A. element B. compound C. mixture D. solution

A chemist prepares a solution of aluminum sulfite by measuring out 109 umol of aluminum sulfite into a 350 mL volumetric flask and filling the flask to the mark with water.

How many Na + ions are in 3.0 moles of Na2O?

Does a reaction stop once it has reached equilibrium? Explain

What is the total number of oh groups in a molecule of glycerol?

What are two ways to make a saturated solution of NH3 in 100. g H20 at 60°C become unsaturated?