객관식
At a pH of 7, are the concentrations of any of the four possible phosphate species (H3PO4, H2PO4-, HPO4^{2-}, PO4^{3-}) negligible?
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1. Intro to General Chemistry
Chemical Properties
객관식
Which analytical technique examines both physical and chemical properties to determine the presence of abnormal elements in a sample?
A
Distillation
B
Chromatography
C
Filtration
D
Qualitative analysis
검증된 단계별 안내1
Understand that the question is asking for an analytical technique that examines both physical and chemical properties to identify abnormal elements in a sample.
Recall that distillation is a separation technique based primarily on differences in boiling points (a physical property), so it mainly addresses physical properties.
Recognize that chromatography separates components based on their movement through a medium, which is also largely a physical separation method.
Note that filtration separates solids from liquids based on particle size, which is a physical process and does not provide chemical information.
Identify that qualitative analysis is a comprehensive approach that involves both physical observations and chemical tests to detect and characterize elements or compounds, making it the correct technique for determining the presence of abnormal elements.
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