<h2>Matter Composition and Our Health</h2>
<p>Your overall health and susceptibility to disease depends upon the complex interaction between your genetic makeup and environmental exposure, with the outcome difficult to predict. Early detection of biomarkers, substances that indicate an organism’s disease or physiological state, could allow diagnosis and <a data-lesson="chemistry-applications-water-treatment" data-subject="chemistry" data-tutorial="solutions-and-colloids" href="https://app.ulearngo.com/chemistry/solutions-and-colloids/chemistry-applications-water-treatment">treatment</a> before a condition becomes serious or irreversible.</p>
<div class="wp-caption alignnone" id="attachment_96162" style="width: 800px"><a href="https://data.ulearngo.com/assets/b10bc2dd-3ec7-4f21-a86e-eb94a84e21ae"><img alt="biomarkers" class="size-full wp-image-96162" height="369" src="https://data.ulearngo.com/assets/b10bc2dd-3ec7-4f21-a86e-eb94a84e21ae" width="800"/></a><p class="wp-caption-text">Analysis of molecules in an exhaled breath can provide valuable information, leading to early diagnosis of diseases or detection of environmental exposure to harmful substances. Image credit: modification of work by Paul Flowers</p></div>
<p>Recent studies have shown that your exhaled breath can contain molecules that may be biomarkers for recent exposure to environmental contaminants or for pathological conditions ranging from asthma to lung cancer. Scientists are working to develop biomarker “fingerprints” that could be used to diagnose a specific disease based on the amounts and identities of certain molecules in a patient’s exhaled breath.</p>
<p>An essential concept underlying this goal is that of a molecule’s identity, which is determined by the numbers and types of atoms it contains, and how they are bonded together. The next set of lessons will describe some of the fundamental chemical principles related to the <a data-lesson="composition" data-subject="chemistry" data-tutorial="quantitative-aspects-chemical-change" href="https://app.ulearngo.com/chemistry/quantitative-aspects-chemical-change/composition">composition</a> of matter, including those central to the concept of molecular identity.</p>
<p>By the end of the next few lessons, you should be able to:</p>
<ul>
<li>State the postulates of Dalton’s atomic theory</li>
<li>Use postulates of Dalton’s <a data-lesson="early-ideas-atomic-theory" data-subject="chemistry" data-tutorial="atoms-molecules-ions" href="https://app.ulearngo.com/chemistry/atoms-molecules-ions/early-ideas-atomic-theory">atomic theory</a> to explain the laws of definite and multiple proportions</li>
</ul>

Chemistry generally explores the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances. 

Chemistry

Composition of Matter

Discover the composition of matter, early ideas in atomic theory, atomic structure and symbolism, the periodic table, and chemical nomenclature in this tutorial on atoms, molecules, and ions.


Composition of Matter

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