Chapter 6 chemistry and Chemicall Safety

what is an example of chemical change ?

• ice melting to become water

• water evaporating into the air

• exposed metal rusting

• liquid nail polish hardening

The pH scale is used to measure _.

• acidity and alkalinity

• overexposure and underexposure

• levels of carbon dioxide

• levels of oxygen

Acid-alkali neutralization reactions occur when an acid is mixed with an alkali in equal proportions ,balancing the total pH and forming water ( H2O)

• a salt

• nitrogen

• carbon dioxide

• a sulfur

An SDS is formatted into _ categories .

• 16

• 12

• 10

• 8

If you were to leave the freezer open all night , all of the ice will melt . This is a result of _ .

• an endothermic reaction

• an exothermic reaction

• neutralization

• ionization

why should ammonia never be mixed with bleach ?

• is ¨discolors ¨

• it dries out skin excessively

• it creates a potentially deadly gas

• they become unpredictable in their use

What did the Safety Data Sheet (SDS) replace ?

• the Material Safety Data Sheet (MSDS)

• the Environmental Protection Agency (EPA)

• the National Instituts of Health

• the Occupational Safety and Health Administration

What does a reducing agent do ?

• adds hydrogen to a chemical compound

• subtracts hydrogen from a chemical compound

• adds oxygen to a chemical compound

• Subtracts nitrogen from a chemical compound

What is a Solvent ?

• a stable physical mixture of two or more substance

• a substance that dissolves a solute and make a solution

• a substance dissolved into a solution

• a liquid not capable of being mixed to form a stable solution

Everything you can touch and everything you can see is a matter EXCEPT _.

• chemicals and powders

• liquids and gases

• light and electricity

• living and once-living bodies