Multiple Choice
What happens when you stir a spoonful of sugar into hot water?
1. Intro to General Chemistry
Physical & Chemical Changes
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Which of the following is an observation and not an inference?
A
The blue color indicates the presence of copper ions.
B
The solution is blue because of a chemical reaction.
C
The solution must be acidic because it turned blue.
D
The solution turned blue when copper sulfate was added.
Verified step by step guidance1
Understand the difference between an observation and an inference. An observation is a direct statement of what is perceived using the senses, while an inference is a conclusion drawn from observations.
Identify the statements given in the problem. Each statement should be evaluated to determine whether it is an observation or an inference.
Analyze the statement 'The blue color indicates the presence of copper ions.' This is an inference because it draws a conclusion about the presence of copper ions based on the color observed.
Evaluate the statement 'The solution is blue because of a chemical reaction.' This is also an inference, as it explains the cause of the blue color based on a chemical reaction.
Consider the statement 'The solution turned blue when copper sulfate was added.' This is an observation because it directly describes what was seen without drawing any conclusions or explanations.
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