Which of the following are observations Pick all correct choices

The candle floats.

The tires are flat.

The dog is barking.

The tire is flat because of a decrease in temperature.

If a person walks by, then the dog will bark.

Describe each of the following as a physical or chemical property. 1. Apple slices turn brown when exposed to air. 2. At room temperature, mercury is a liquid. 3. Phosphorus will ignite when exposed to air. 4.

What kind of bond is not formed by differences in electronegativity? A) ionic B) polar disalent C) polar covalent D) nonpolar covalent

What types of change if any can reach equilibrium A chemical change only A physical change only Both Neither

Write the autoionization reaction for methanol, ch3oh.

Butane C4 H10 (g), (Hf = - 125.7), combusts in the presence of oxygen to form CO2 (g) (Hf = - 393.5 kJ/mol), and H2O (g) (Hf = - 241.82) in the reaction: What is the enthalpy of combustion, per mole, of butane? Use

Define Percent transmittance

Express (3 x 104) (4 x 1023) in scientific notation

The theoretical yield of aspirin in a reaction is 721 g. What is the percent yield if 461 g is produced?

Nonmetal oxides can react with water to form acids. For example, carbon dioxide reacts with water to form carbonic acid: CO2 H2O H2CO3. (1) Write an equation to show how diiodine pentaoxide reacts with water to form an acid. Do not include states.

If atmospheric pressure suddenly changes from 1.00 atm to 0.892 atm at 298 k, how much oxygen will be released from 4.40 l of water in an unsealed container?