Chemical vs. Physical
This type of change forms a new substance>
Chemical
Bubbling during a reaction usually shows this is being produced.
gas
The safest of the five senses a scientist uses to observe reactions is:
Sight
A reaction that releases heat is called:
exothermic
After collecting data scientists should do this:
interpret data
This type of change only changes the shape or state but not the substance.
Physical
A change in this property may show that a new substance has formed.
Color change
This is a good example of a scientific observation.
Answers will vary
A reaction that absorbs energy and becomes colder is called:
endothermic
Interpreting data means doing this with the information gathered:
explaining what the data shows
Melting ice is an example of this type of change.
physical
When a solid suddenly forms in a liquid during a reaction, it is called this.
precipitate
This tool is easiest for scientists to measure during a reaction.
data table
Light produced during a reaction is evidence of:
energy transfer
Evidence is important in science because it does this.
supports conclusions
Rust forming on metal is an example of this type of change.
chemical
This is NOT evidence of a chemical reaction:
color change
gas bubbles
size change
size change
This evidence is easiest for a scientist to measure during a reaction.
odor change
color change
temperature
temperature
This object produces light from a chemical reaction without electricity.
A scientist might ask this question after observing a reaction.
What evidence showed a reaction occurred.
During a chemical reaction, atoms do this instead of disappearing.
rearranging
This lab we did yesterday shows an example of gas production during a chemical reaction.
Baking soda and vinegar
What should a scientist before the reaction begins?
the control
If a reaction feels warm, it means this type of energy was released:
heat energy
What combination best shows a chemical reaction occurred?
color change/gas bubbles
temperature change/size change
size change/color change
color change gas bubbles