Explain why chemistry affects all aspects of life and most natural events.
because living and nonliving thinga are made of matter
Name the five traditional areas into which chemistry can be divided.
organic, inorganic, biochemistry, analytical, and physical chemistry
Describe the relationship between pure chemistry and applied chemistry.
pure research chan lead directly to an application, but an appliation can exist before reasearch is done to explain how it works
List three reason for studying chemistry.
chemistry can be useful in explaining the natural world, preparing people for career opportunities, and producing informed citizens.
When Chemists develop new materials, what is their general goal?
design materials to fit a specific need
Name three ways chemists help meet the demand for energy.
conserve (insulation), Produce (fossil feuls are limited), Store (batteries)
How do chemists help doctors treat patients?
supply the medicines, materials, and technology
What role do chemists play in agriculture?
help develop more productive crops and safer, more effective ways to protect crops
How do chemists help protect the environment?
help identify pollutants and prevent pollution
Describe two ways that chemists study the universe.
chemist gather data from afar and analyze matter this brought back to earth
What did alchemists contribute to the development of chemisty?
the tools and techinques for working with chemicals
How did Lavoisier revolutionize the science of chemistry?
helped transform chemistry from a science of observation to the science of measurement this it is today.
Name three steps in the scientific method.
making observations, forming a hypothesis, and developing theories
Explain why collaboration and communication are important in science.
incease the likelihood of success
what are the two general steps in successful problem solving?
develop a plan and implement the plan
List the three steps for solving numeric problems.
analyze, calculate, and evaluate.
list the two steps for solving conceptual problems.
anaylze and solve
Name two categories used to classify properties of matter.
extensive or intensive
Explain why all samples of a given substance have the same intensive properties.
every sample has the same composition
name three states of matter
solid, liquid, and gas
describe the two categores used to calssify physical changes.
reversible or irreversible
How are mixutres classified?
heterogeneous or homogeneous
What types of properties can be used to seperate mixtures?
How is a compound different from an element?
Compounds can be broken down into simpler substances by chemical means, elements cannot
How can you distinguish a substance from a mixture?
if the composition of a material is fixed, the material is a substance. if the composition of a material may vary, the material is a mixture.
What are chemical symbols and chemical formulas used for?
chemists use chemical symbols to represent elements, and chemical formulas to represent compound.
How does a chemical change affect the composition of matter?
the composition of matter always changes
Name the four possible clues that a chemical change has taken place.
transfer of energy, change in color, production of gas, formation of a precipitate.
In a chemical reaction, how does the mass of the reactants compare with the mass of the product?
the mass of the products is always equal to the mass of the reactant