Which of the following could indicate that a chemical change has taken place?

gas formation

formation of a precipitate

color change

all of the above

If more solvent is added to solution, the value of heat of solution a. Increases. b. Decreases. c. not affected. d. affected only when solution is infinity diluted.

Complete the table below by filling in the principal quantum number n and angular momentum quantum number l for each electron subshell listed. subshell principal quantum number n angular momentum quantum number l 4f 7s 4p 7p

What are the amounts of molecules in 19 g flourine

To make sure that the white powder was all sodium chloride and not mixed with sodium hydrogen carbonate, would you need to add a little less or a little more hydrochloric acid to the reaction?

A gas has a volume of 800 mL at a temperature of - 55.0 celsius what volume with the gas occupy at 25.0 celsius? show your work

What type of chemical reaction is C6H6 + CI2 = C6H5CI + HCI

True or False : During neap tides, low tides are highest because the Sun, Earth, and the Moon form a right angle.

Determine the number of protons, electrons, and neutrons for cobalt with a charge of + 6 and a mass of 61.

Which of the following is false about a spontaneous chemical reaction that generates electricity:a. Oxidation and reduction half-reactions occur at electrodes in electrochemical cells. b.

What change would you expect on the rate of theSN2 reaction of 1-iodo-2-methylbutane withcyanide ion if the nucleophile concentration isunchanged and the alkyl halide concentration isdoubled?