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User IsidroKump49
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What are the key historical milestones in the development of the periodic table of elements, and how did they contribute to our understanding of chemical elements and their behavior?
answered
Jan 30
in
Chemical education
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votes
59
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A 5 g sample of a mixture containing sand and salt is dissolved in water. The solution is filtered, and the sand is collected and dried. The dried sand has a mass of 3 g. Using mass balance calculations, determine the percentage of salt in the original mixture.
answered
Jan 22
in
Analytical Chemistry
0
votes
55
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Where does the concept of 'existential guilt' come from?
answered
Jan 20
in
Psychology
0
votes
22
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What is disorganised attachment?
answered
Jan 14
in
Psychology
0
votes
32
views
What transmits nerve impulses to other cells?
answered
Jan 8
in
Science
0
votes
47
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What makes sunsets appear red?
answered
Jan 7
in
Science
0
votes
28
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Mirrors and lenses are used in optical instruments to reflect and refract what?
answered
Dec 31, 2024
in
Science
0
votes
33
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If a human only has 45 chromosomes it is most likely due to a mistake during what?
answered
Dec 30, 2024
in
Science
0
votes
41
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Genetic variation helps ensure that some organisms will survive if what happens?
answered
Dec 30, 2024
in
Science
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