Multiple Choice
Which of the following is a key chemical property that distinguishes an element from a compound?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following is a qualitative observation?
A
The temperature increased by 5 °C.
B
The pH of the solution was measured to be 4.2.
C
The solution turned blue after adding copper(II) sulfate.
D
The mass of the precipitate was 2.3 g.
Verified step by step guidance1
Understand the difference between qualitative and quantitative observations. Qualitative observations describe qualities or characteristics without using numbers, such as color, texture, or smell.
Quantitative observations involve measurements and numbers, such as temperature, pH value, or mass.
Review each option: 'The temperature increased by 5 °C' is quantitative because it includes a numerical value.
'The pH of the solution was measured to be 4.2' is also quantitative due to the numerical pH value.
'The solution turned blue after adding copper(II) sulfate' is qualitative because it describes a color change without any numbers.
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