Chemistry - Unit 1
Who developed the philosophical idea of the atom?
Democritus
Which of the following is an example of how chemicals make our lives easier?
chemicals can keep bread fresher longer.
Which of the following would be a testable hypothesis for an experiment that compares the health of a salmon raised in farms to salmon caught in the wild?
salmon living in the wild experience fewer diseases than salmon raised in farms.
Many cities have to deal with icy roads during the winter. To fix the problem, city workers pour salt onto the roads. Which rule about the physical world are they using?
salt helps melt ice at colder temperatures.
What do chemists study?
the properties of matter and how matter changes.
Which of the following is an example of how research into the effects of a chemical has changed how it is used?
finding out that asbestos is dangerous and limiting its use in building materials.
Which of the following questions about animals called ferrets is a scientific question?
how many hours a day do ferrets sleep?
What do physicists study?
how matter and energy interact.
Which of the following describes something an engineer would probably do first when developing new technology meant to reduce ocean pollution?
identify the need to reduce ocean pollution.
Where is chemistry used?
in all areas of life.
Where are chemicals found at work?
in every area of work.
How does the scientific method help scientists?
it helps them get reliable results.
Which of the following is a type of cancer?
leukemia.
What do biologists study?
living things.
What is a scientific question?
one that is answered through observation.
Why do scientists look for patterns in the world?
patterns can help explain observations.
Why is alchemy no longer accepted?
scientists used evidence, analysis, and experiments to disprove alchemy.
When a group of engineers conduct a trial launch of a new rocket, the rocket explodes on the launchpad. What should the engineers do next?
study the data to see why the rocket failed and how it could be improved.
What did the Copernican revolution demonstrate?
that science was a process of changing ideas.
Which of the following might a biologist chose to study?
the causes of honeybee deaths in beehives.
What do the conclusions tell you about the experiment?
the conclusions tell why the data support or reject the hypothesis.
Why do scientists need government funding?
the cost of doing scientific research can be very high.
Which of the following is true about a scientific hypothesis?
the hypothesis must be testable.
What did Dalton's atomic theory teach?
the smallest unit of matter is the atom.
What happens when a chemical is determined to be dangerous?
the use of the chemical is regulated.
How do chemicals affect the environment?
they can both help and hurt the environment.
Why should scientists perform experiments?
to answer specific questions.
What question might a scientist ask about a cuttlefish?
what do cuttlefish have in common?
Who developed the first atomic theory?
John Dalton developed the atomic theory, which he published in 1803.
Which of the following people would most often use chemistry in their work?
a paint manufacturer.
What kind of scientist would study the force of a car running into a wall?
a physicist.
What is the final step in the scientific method?
analyze the data and draw conclusions.
What is matter?
anything that takes up space and has mass.
A team of engineers has decided to design a new shoe for people suffering from a painful foot condition. Which of the following tasks should the team undertake during the process of researching the condition?
consult with an orthopedist about how to best accommodate potential consumers in terms of physical comfort and pain alleviation.
Below are the steps of the engineering process (not necessarily in order): a) Know the background b) Do the work c) Make a plan d) Identify a need e) Evaluate and redesign f) Test the results What is the correct order for these steps?
dacbfe d) Identify a need a) Know the background c) Make a plan b) Do the work f) Test the results e) Evaluate and redesign
Who uses chemicals?
everyone.
What do scientists use to design their experiments?
the scientific method.
How does a scientist help the government?
the scientist provides unbiased information to the government.
How does a scientist answer a scientific question?
by observing and measuring.
How might the government make sure scientific research is done in an ethical way?
by taking away research funds if certain ethical standards are not met.
How have chemists helped fight leukemia?
chemists have developed medicines to fight leukemia.
An engineering team designs a rocket that flies faster and requires much less fuel than other rockets. However, the rocket explodes the first time it is launched. Which step of the engineering process would have shown that there was a potential problem?
evaluate the results.
Why do experiments need to be repeatable?
experimental results are not reliable if they are not repeatable.