Ex) Evaporation, Distillation 2) Pure Substance a) Elements Simplest form of matter Made up of one kind of atom Can’t be decomposed chemically I) Metals Luster Malleability (Strong Bonds) Ductile (Ability to draw into wire) Good conductors of heat/electricity Hard High melting points II) Non-Metals Dull Poor conductors Brittle Low melting point b) Compounds: 2 or more different elements chemically combined and chemically decompose B)
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behind biomolecules What is biochemistry? Well, it’s the study of biology at a molecular level. So the emphasis of this unit is the biological significance of chemical molecules. As part of the course, there are six biological molecules that you need to know about: CH2OH Carbohydrates O H H OH OH These molecules are one of many vital to life. They are used for energy (for both storing and supplying energy), and in some cases can be used structurally, such as cellulose Lipids
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oxidation number of a molecule, atom, or ion changes by gaining or losing an e-. They occur every day and are vital to some of the basic functions of life. Some examples include photosynthesis (within plants), respiration (within animals), combustion, and corrosion or rusting. To understand these types of reactions, you must first understand oxidation numbers or states. Rules for Assigning Oxidation States The oxidation number corresponds to the number of electrons, e-, that an atom loses, gains, or
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1 MULTIPLE CHOICE QUESTIONS 1. The symbols for sodium, carbon and oxygen… a) S, C and W b) S, C and O c) Na, C and O d) NA, C and O 2. The positive loaded parts in an atom… a) Electrons b) Protons c) Neutrons d) Molecules 3. We define matter as anything… a) That we can feel b) That we can see c) That has mass and takes up space d) That has weight 4. The name for NH3 is… a) Ammonia b) Nitrogen Hydroxide c) Natrium Hydroxide d) Ammonium
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Benefits of the Ozone Gas Ozone (O3) is a natural gas comprising of three oxygen atoms and is a particularly an unstable fume. Ozone gas is visibly blue in color and has a sturdy odour regularly described as the whiff of air after a springtime electrical thunderstorm. Some people also refer to the odour as like the smell of watermelons. Normal oxygen (O2), which living beings except plants breathe, has dual oxygen atoms and is invisible and odourless. Despite its being a natural gas ozone can be manufactured
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Benefits of the Ozone Gas Ozone (O3) is a natural gas comprising of three oxygen atoms and is a particularly an unstable fume. Ozone gas is visibly blue in color and has a sturdy odour regularly described as the whiff of air after a springtime electrical thunderstorm. Some people also refer to the odour as like the smell of watermelons. Normal oxygen (O2), which living beings except plants breathe, has dual oxygen atoms and is invisible and odourless. Despite its being a natural gas ozone can be manufactured
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Faster vibration would cause a higher pitch while slower vibration would cause a lower pitch. 7. Explain how different factors affect the speed of sound? Speed of sound depends on factors such as altitude, humidity, and temperature because sound waves need molecules to collide in
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the attractive forces between the positive and negative ions; ionic bonding is regarded as an example of strong bonding. It’s also a bond in which on atom loses an electron to form a positive ion (cation) and the other atom gains an electron in order to have a full outer shell of electrons to make them stable. One atom pulls an electron from another atom.
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October 5, 2015 6. Briefly describe the structure and size of an atom. How big is the nucleus in comparison to the entire atom? Atoms are extremely small; millions of atoms could fit end to end across a period at the end of a sentence. Protons and neutrons are found in the tiny nucleus at the center of the atom. The rest of the atom’s volume is made up of electrons, which surround the nucleus. The nucleus is very small compared to the atom as a whole, but it contains a majority of the atom’s mass.
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1. Explain the connection between your health and what you breathe. -Clean unpolluted air keeps us alive and healthy, that is why it’s important for us to keep our environment clean 2. Describe air in terms of its major components, their relative amounts, and the local and regional variations in the composition of air. -Major components of air are: nitrogen, oxygen, argon, carbon dioxide, and water vapor. The composition of air by volume is about 78% nitrogen, 21%oxygen, and
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