An unknown substance turns methyl orange solution red. This shows that the substance is a base. is water. is an acid. is an alkaloid.

If a reaction has g of -136kj at 110°c, will it be spontaneous at this temperature (110°c)? yes or no

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

Apound is approximately 0.45 kilogram. a persons weighs 87 kilograms. what is the persons’s weight, in pounds, when expressed to the correct number of significant figures