Unit 4: Chem
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| In comparison to other things, how small is an atom? How would we know just how small it is? |
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| What are the subatomic particles that make up an atom? | Protons, neutrons, and electrons.
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| What are their charges and where are each of them found? | Protons (positive) and neutrons (neutral) are in the nucleus, and electrons (negative) are in the space around the nucleus.
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| Can scientists pinpoint exact locations of electrons? Why is the drawing of a perfect circle around the nucleus not a good representation of where electrons are found? | No, scientists can't.
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| Are all the subatomic particles equal in mass? | No, protons and neutrons are equal in mass, while electrons have a much smaller mass.
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| Why are the atoms that we practiced drawing always neutral? | Because they had equal numbers of protons and electrons.
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| What is the name for the electrons that are available to bonding? | Valence electrons.
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| What are the two types of bonds that we talked about? Define. | Covalent bonds are where electrons are shared between atoms. Ionic bonds are bonds in which electrons are transferred from one atom to another.
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| Be able to recognize an ionic bond if a drawing of one is placed in front of you. You should be able to recognize the transfer of an electron over the another atom. | Aight
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| Be able to analyze a picture of a covalent bond happening. | Aight
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| What is an element? | An element is a substance in its simplest form; cannot be broken down any further.
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| What is a compound? What is a molecule? What is the difference? | A compound is a molecule with two or more elements. A molecule is two or more atoms bonded together.
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| What characteristics allows water molecules to behave in a "sticky" way? (think about it's shape and where electrons are found) | Water has two hydrogen atoms. Electrons are not as present around the hydrogen atoms, and more present around the oxygen atom. This allows the hydrogen to bond to more oxygen atoms.
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| What bonds are formed between water molecules to make them stick to each other? | Hydrogen bond
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| How would an organism utilize the cohesive properties of water? |
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| How would an organism utilize the adhesive properties of water? |
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| Why is water so important? |
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| How is surface tension created? How were the paper clips able to float on the water even though they were metal? | The water molecules want to cling to each other. There are no water molecules above the surface of the water (just air). This results in a stronger bond at the surface.
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| What is organic chemistry? | Organic chemistry is the chemistry of carbon compounds.
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| Why is the carbon atom used in so many things? (Think about its structure) | It can bond with many elements because it has four valence electrons, creating long, stable chains.
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| What is an organic molecule or macromolecule? How is carbon able to form these? |
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| What are the 4 organic molecules that we looked at? | Carbohydrates, lipids, nucleic acids, proteins
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| Know the monomers for each of the 4 organic molecules. | Carbohydrates -- monosacchride (simple sugar)
Lipids -- fatty acids and glycerol (triglyceride)
Proteins -- Amino acids
Nucleic Acids -- Nucleotide
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| Hoe do body systems rely on organic molecules? |
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| If given a story problem about a persons health be able to figure out which nutrient (or macromolecule or organic molecule) is missing. | Aight
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| Which organic molecule provides us with energy? | Carbohydrates
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| How are carbohydrates used by the human body? | Used for energy
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| How are lipids used by the human body? What systems ? | Energy storage and the building block for cellular components;
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| Be ready to evaluate different organic molecules and how they are used in the body. | Aight
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| Why are organic molecules important to life in general? |
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