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What Pluto observations did not help convince scientists to change Pluto's status from that of a planet?
The discovery of Pluto's 3 moons.
What are 3 ways you know a chemical change has taken place?
Three signs of a chemical reaction include the release or absorption of heat, a change in color, and the creation of a gas or a precipitate.
What were at least five observations you made that indicated a reaction had occurred in part a?
Gas produced Change in temeration fizzing Change in color
What are the types of systematic observation?
Observations can be Quantitative and or Qualitative. Quantitative observations are made objectively and are measurements and factual observations. eg "The plank is 3 feet long and rough sawn".Qualitative observations are subjective and may not be factual. eg. "The plank is a pretty colour and feels furry".
How did Torricelli's observations change the ideas scientists had about the compositions of matter?
Toricelli was not known for contributions about composition of matter.
Prediction need to change when?
observations change
What Pluto observations did not help convince scientists to change Pluto's status from that of a planet?
The discovery of Pluto's 3 moons.
What are the signs of physical change from a chemical change?
Signs of physical change - Change in appearance,taste,display of substance Signs of chemical change- Change in chemical reaction
When was Signs of Change created?
Signs of Change was created in 1977.
When do predictions need to be revised?
observations change.
What is three minus negetive four?
3--4 Change those two minus signs into a plus. 3+4=7
What are two observations you might make when a physical change occurs?
change in shape and color.
What are presenting symptons of this disease?
Signs and symptoms are both used in diagnosis. Signs are the objective observations that can be sensed, measured, or recorded by another person. Symptoms are the subjective experience that has to be reported.
Why have scientist change their ideas on the model of the Atom?
There has been more and more observations about the atom that has changed it since then. They revised it to explain the observations.
When subtracting two numbers and the signs are negative the difference is what?
Example: -4-(-3)=? Change the subtraction sign to plus sign and change the negative three to a positive three. -4+3= -1
List THREE of the signs of global climate change that Canada has experienced?
Please ANSWER THE QUESTION ! :) 1. ___________2. ___________ 3. ___________
What are signs of a chemical reaction?
Some signs could be: *solids forming *bubbles *color change *temp. change
