Unit 1 Exam - Skills of a Scientist

Which are observations of these steel spheres?

• They are reflective and have different volumes.
• They are reactive with sulfuric acid and will oxidize in high temperatures.
• They are pretty, fun to play with and loud when they drop.

Which black disc was an insulator?

• The one that melted the ice quicker.
• The one that did not melt the ice as quickly.
• The one that felt cold when we began.
• Ours were circles which indicates that neither of these are insulators.

What is serendipitous?

• when something good happens unexpectedly
• the ability to float or sink
• the downward force due to the mass of Earth (also known as gravity)
• an opinion that Katrina is weird

One way to measure the mass of an object is to

• use a ruler and measure it
• put the object in water and see if it floats or sinks
• drop the object and see how it falls
• put the object on a scale and weigh it

Qualitative observations

• use words to describe objects being observed (not numbers).
• use numbers to describe objects being observed (not just words).
• are your opinion or thoughts on an object being observed.
• are conclusions based on data collected in an experiment.

What is one observation and one claim from this gif?

• Evidence: A cute dog is runs away. An earthquake happens. Claim: The dog is a rescue from a shelter.
• Evidence: An earthquake shakes the building and camera. Claim: A volcano erupted nearby causing the earthquake.
• Evidence: A dog is startled and runs away. Something shakes the camera. Claim: The dog detected an earthquake before the humans.

What happens after the Alka Seltzer tablet is placed in the water with the lid on the film canister? Why?

• It will do nothing because ours did not work when we tried it.
• It will melt because Alka Seltzer causes an exothermic reaction producing much heat.
• It will shoot the canister up into the air because of the build up of pressure as carbon dioxide is released.
• It will change colors because it is a chemical indicator of acids or bases.

Homeostasis is

• maintaining a constant internal environment like temperature or water concentration.
• the scientific name for humans.
• observing an object carefully and collecting data in an experiment.
• being safe and following directions in a lab.

The manipulating variable is

• the dependent variable and you will collect data to graph on the y-axis.
• the independent variable and you will collect data to graph on the x-axis.
• the dependent variable and you will collect data to graph on the x-axis.
• the independent variable and you will collect data on the y-axis.

Systems, including Earth, are made up of _____ and ____.

• truth and lies
• parts and people
• matter and energy
• computers and humans