Which of there is an indication that a chemical reaction has occurred?

a. freezing of substance

b. a change in color of a substance

c. melting of a substance

d. boiling of a substance

Hydrochloric acid is purchased in 12 molar concentrations. If I needed 200 ml of 2.0 molar HCl, how many milliliters of the concentrated solution would I need

How can a molecule have a momentray dipole

SDJ, Inc., has net working capital of $1,910, current liabilities of $5,610, and inventory of $1,265. What is the current ratio? (Do not round intermediate calculations and round your answer to 2 decimal places, e. g., 32.16.

How many milliliters of 0.500 M NaOH should be added to 10.0 g of tris hydrochloride (FM 121.135) to give a pH of 7.60 in a final volume of 250 mL? pk, for the tris = 8.072

Which of the following could be a benefit of climate change? A. Flooding would increase, bringing water to areas in drought. B. Bird migration will be altered, changing their nesting patterns. C.

How can you use the chemical formulas for sucrose (C6H, 20,) and rust (Fe, O,) to classity them ionic or molecular compounds?

What is true of energy as is passes through an ecosystem? a. All of the energy in an organism is used by the animal that eats it. b. Any stored energy in an organism is used by the animal that eats it. c.

Which can associate a suspect and the firing of a gun? (its not b) A) markings on the gun's exterior B) markings on the casing C) markings on the bullet D) powder residues

Which of the following locations would most likely have the most fertile soul?

What is an "alloy" in the chapter of metals in chemistry?