What are other signs of chemical change

What mineral is this? Egg-sized piece. Transparent pink color with glassy luster. Shows conchoidal fracture. The hardness is 7.

Give me a paragraph about the sun

3. The variable that is observed during an experiment is called what type of variable?

What is the formula for CO3 2 - and Al3 + ?

Which measurement were you most familiar with before The Games? Why? A. Paper Cup challenge B. Hoppity Hop C. Marble Grab D. Side Step E. Straw Javelin Throw

In most Acid-base reactions, what type of bond (ionic or covalent) is formed between the ions of the "salt"? What happens to the electrons in this sort of bond? Are they transferred, or shared?

Many trials are not needed before a hypothesis can be accepted

Consider the following reaction where Kp = 4.55*10-5 at 723 K: N2 (g) + 3H2 (g) ⇋ 2NH3 (g) a) If the three gases are mixed in a rigid container at 723 K so that the partial pressure of each gas is initially one atm, what will happen?

Rob measures the solubility of three different salts in water at 22°C. Which type of graph should he use to display his data? bar graph line graph histogram scatterplot

Consider the reaction below. The initial concentrations of PCl3 and Cl2 are each 0.0571 M, and the initial concentration of PCl5 is 0 M. If the equilibrium constant is Kc=0.