Name one way that atoms become positively or netatively charged?
1.By rubbing hands against another object.
2. By picking up electircal charges from other objects.
3. Byelectrons fall off.
100
What is the path through which an electrical current flows called?
An electrical circuit.
100
What will a substance do if the substance is more dense than its medium?
The substance will sink.
100
What is it called when you use a series of steps to find the answer to a question?
An experiment.
100
Name one of the two factors that determine viscostiy?
Temperature or silica content.
200
What's the build up of an electrical charge called?
Static electricity.
200
What is the push behind a flow of electrons called?
Volts
200
What happens to an object when it expands?
It gets bigger.
200
What is it when you grow microoganisms in a specially prepared nutrient medium?
A culture.
200
What are the black spots on tomatoes called?
Water mold
300
What are free flying electrons?
Electricity.
300
Name the two kinds of electricity.
Static and current electricity.
300
Do any two substances have the same boiling point and melting point?
No
300
Tell what Spirilla are and discribe what they look like.
Bacteria that are twisted in shape looking like a staircase.
300
Which of the following correctly pairs a microorganism with a disease it creates? A. protoazoa and the flu.
B. virus and athleats foot.
C. bacteria and strep throat.
C. Bacteria and strep throat.
400
What do electrons orbit around?
An atom.
400
What kind of objects resist or stop the flow of electrons?
Insulators
400
What is a substance if it floats?
If it is less dense than the medium.
400
What does not have a nuclei?
Bacteria does not have a nuclei.
400
What is the Fuzzy growth containing cells called?
It is molds.
500
What is a unit of electrical power called?
A watt.
500
What kind of objects let electricity flow through them?
Conductors
500
When the temperature decreases below the melting point how does the substance change?