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What is a wide range of observations and experimental results are based on evidence and can change with new evidence?
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When would scientists need to change a theory?
Scientists had made observations that did not fit exactly with Dalton's theory. Scientists changed the atomic theory to include this new knowledge. While the modern atomic theory is based on Dalton's theory, it is also very different.
When do scientific models need to be changed?
Scientific models are continually refined through experimentation. When experimental results, which violate the model, have been confirmed by a third-party then scientists seeks to change the model such that the results can be explained.
Why do experiments have to be repeatable?
Apex Experimental results are not reliable if they are not repeatable.
What is the difference between a conrtol group and an experimental group in a controlled experiment?
The control group does not change, while the experimental group is the variable you are changing.
What is experimental Variable?
The independent variable is the one variable that you change in your experiment
What do scientist use to make sure that experimental results are not due to change?
repeated trials
What kinds of scientific investigations do involve observations?
All science involves observations. A scientist is either observing the world as it is normally, or is changing something and observing the results of the change. The "change something and observe the results of the change" is called an "experiment". If you're not observing something, then you are not doing "science".
What kind of scientific investigation do not involve observations?
All science involves observations. A scientist is either observing the world as it is normally, or is changing something and observing the results of the change. The "change something and observe the results of the change" is called an "experiment". If you're not observing something, then you are not doing "science".
What observations give evidence that a chemical reactions has happened?
is the colour change, tempeture change ,gas produced the most common ones
What is the difference between the independent variable and the experimental variable?
the independent variable is changed, and the experimental value measure. So you control the independent variable and change it to measure the results
How did Ernest Rutherford change the atomic model based on his experimental results?
He placed positive material in the atom's center.
How did Niels Bohr change the atomic model based on his experimental results?
He placed electrons in orbits around the nucleus.
Why have scientists revised the a atomic model many times?
they could discover a new atom and it would change
When would scientists need to change a theory?
Scientists had made observations that did not fit exactly with Dalton's theory. Scientists changed the atomic theory to include this new knowledge. While the modern atomic theory is based on Dalton's theory, it is also very different.
When do scientific models need to be changed?
Scientific models are continually refined through experimentation. When experimental results, which violate the model, have been confirmed by a third-party then scientists seeks to change the model such that the results can be explained.
What is the definition of the experimental group?
The experimental group is use to compare with the control group, and viceversa. The experimental group is the group that we change the variable to experiment it's effects, as twcontrol group is the'original' experiment's results. Such a when we want to know the effect of changing a variable.
How did J. J. Thomson change the atomic model based on his experimental results?
He described the atom as a sea of positive charge sprinkled with electrons
