The only definite evidence of a chemical reaction is

A) The production of new substances

B) Changes in phase

C) Formation of a gas

D) A color change

The concentration of a diluted "wine" sample was found to be 0.24 % (v/v) ethanol. Assuming the wine was diluted by 75x before analysis, what was the original concentration of ethanol in the "wine"

Match these items. 1. acid _ H + 2. base _ H 3 O + 3. litmus _ pH 14 4. strong base _ charged particles 5. ions _ OH - 6. hydronium _ indicator

Which show how the properties of the two objects compare? A. temperature and total kinetic energy are different. B. Thermal energy and temperature are the same. C. Temperature and average kinetic energy are the same. D.

A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 31.0 cm wide and 37.2 cm high.

Which compound is a base? lemon juice sour milk vinegar soap

Determine the percentage composition (by mass) of oxygen in NH4NO3.

Why does aluminum have a higher specific heat than gold?

The frequency of a given region of the electromagnetic spectrum is more than 3 x 1019 HZ. Note that the speed of light is 2.998 x 108 m/s. Which waves are found in this region? A. gamma rays B. visible light C. microwaves D. radio waves E. x-rays

Match the following: 1. C2H4 + Cl2 reaction 2. DDT interferes with this formation 3. benzene reacting with F2 4. by-product of substitution of alkanes and halogens HCI Substitution Addition Calcium

What is the molarity of a solution made with 298g of potassium chloride dissolved in enough water to make 2L of solution?