Chem 1406 Lab

Barium

A bright greenish-yellow flame is produce by which element?

True

A chemical reaction is a rearrangement of the elements in the reactants

Distillation separates substances by differences in their

Boiling Points

Has a nonluminous appearance

A properly adjusted Bunsen burner flame ________.

a solid melting into a liquid

Evidence of a chemical reaction EXCEPT:

violet to red

Passing white light through a spectroscope forms colors from ________

two beakers and a glass rod

Glassware needed for decantation

in all above

Chemical processes take place

False

Chromatography is useful for separating polar compounds but not nonpolar.

it would be the same

Cutting steel in half changes its density how?

solubility

Purifying boric acid took advantage of temperature-sensitive ________.

CO

Chemical formula for carbon monoxide

carbon dioxide

Antacids reacting with HCl produce which gas?

False

Metric units of length, mass, and volume are meter, gram, and pint.

True

Organic materials burning produce a bright yellow flame

by absorbing nitrogen from the air

CO₂ does NOT smother a fire by ________.

strengthen tooth enamel

Sodium fluoride in toothpaste is used to ________.

5

0.02060 has how many significant figures?

elements

The primary substances from which all others are made:

carbon dioxide and water vapor

Two chemical products after complete combustion of fuels

the weight of everything EXCEPT the sample

The tare weight is ________.

polarities

Like dissolves like” refers to similarity in ________.

14, 10, 7, 4, 1

pH values from most basic to most acidic:

100

A pH 8 solution contains _____ times more acid than pH 10.

dry ice subliming

Which is a physical change

the concentrated acid would exhibit a brighter light

Difference between concentrated and diluted HCl using conductivity:

move the greatest distance up the paper strip

Most soluble pigment in chromatography will _______

low specific heat

Sand being cold at night but hot in day means it has _____

True

If temperature increases, molecules move faster.

False

Metals from Li to Au are arranged in descending reactivity

True

In an exothermic reaction, products have less energy than reactants

True

Adding borax makes slime harder due to cross-links.

False

Purification usually results in more product than you started with

the curved surface at the top of a column of water

A meniscus is ________

True

Molecular compounds are made up of all nonmetals.

held together by attraction between opposite charges

An ionic compound is ________.

a. coffee creamer, b. salt, d. flour

Silica anticaking agents are found in (select all):

true

A buffer solution resists pH change.

calcium carbonate

Chalk, limestone, and seashells are mostly ________.

Specific heat capacity is an extensive property

NOT true about specific heat:

the water is at 25 °C.

Pure water has a pH of 7 only when:

only electrons

What particles are involved in chemical reactions?

magnesium

Extremely bright white flare in fireworks comes from ________.

changing the pH value up to 7

Two antacid tablets neutralizing gastric acid results in _______

BVO, b. FD&C Red 3

Food additives targeted for banning (select all