What is the best description of an open system?

A student has to perform an experiment on the effect of heat on a particular chemical which can be seen in the form of a color change. Which section of his lab report will include the color change in that chemical? Title Conclusions Results

Which organism would be most likely to cause damage to a corn crop during a wet summer?

Sphalerite has the following properties: • found in nature • not made by organisms . pure substance • fixed crystal structure Solid Is sphalerite a mineral? yes no Submit

Experiment:phase changes, what was the temperature of the ice before you added heat?

What naturally forms an anion?

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.

How many sulfide ions are present in 23.5g of Sb2S3

2. An automobile tire has a pressure of 210 kPa at 293 K. What will be the tire pressure after driving, if the tire temperature rises to 308 K?

Students measuring the mass of a rock record 6.759 g, 6.786 g, 6.812 g, and 6.779 g. Which other measurement of the block's mass would be most precise? A. 6.702 g B. 6.781 g C. 6.605 g D. 6.858 g