Which examples represent chemical changes? Check all that apply.

burning wood

souring milk

melting copper to join two copper pipes together

browning of a cut apple

cutting a potato into small pieces

What is it called when two objects touching each other eventually reach the same temperature? A. Expansion B. Conduction C. Equilibrium D. All of the above E. None of the above

Which of the following compounds can in principle be isolated in optically active form at room temperature? a. cis-1,4-dimethylcyclohexane b. trans-1,3-dimethylcyclohexane c. 1,1-dimethylcyclohexane d. cis-1-ethyl-3-methylcyclohexane

The layer that is responsible for our magnetic field.

What starting matirials do cells need for cellular respiration

1. Which of the following are considered pure substances heterogeneous mixtures homogenous mixtures elements only elements and compounds 2. Ionic compounds are often formed when a metal atom bonds with a nonmetal atom.

Rank the temperatures from the highest to the lowest. 133F 351K 25C 273K 146C 58F 95F

Calculate the density of sulfuric acid if 35.4 mL of the acid weighs 65.14 g.

Where the single machos?

A reaction will be spontaneous only at low temperatures if both ΔH and ΔS are negative. For a reaction in which ΔH = - 320.1 kJ/mol and ΔS = - 86.00 J/K · mol. Determine the temperature (in °C) below which the reaction is spontaneous.

Is it possible for a balloon with an initial internal pressure equal to 250.0 kPa to naturally expand to four times its initial volume when the temperature remains constant and the atmospheric pressure is 101.3 kPa?