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Questions and Answers
What is the definition of an element?
An element is a pure substance that cannot be broken down into simpler substances by chemical means.
What is the definition of a compound?
A compound is a substance made up of two or more different elements chemically bonded together in a fixed ratio.
How many elements are in the compound NH3?
2
How many elements are in the compound NaNO3?
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How many elements are in the compound O2?
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How many elements are in the compound CH3COOH?
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How many elements are in the compound CCl4
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A solid has the shape ______, the volume _____, and compressibility ______.
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A liquid has the shape ______, the volume _____, and compressibility ______.
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A gas has the shape ______, the volume _____, and compressibility ______.
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What word describes the phase change - solid to liquid
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What word describes the phase change - solid to gas
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What word describes the phase change - liquid to solid
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What word describes the phase change - liquid to gas
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What word describes the phase change - gas to liquid
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What word describes the phase change - gas to solid
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Oxygen
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Hydrogen
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Air
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Kool-Aid dissolved in water
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Trail Mix
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Oil and Vinegar Salad Dressing
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What is the law of conservation of mass?
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How are heterogeneous and homogeneous mixtures different? Please include 1 example of a heterogeneous and 1 example of a homogeneous mixture.
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Compare and contrast elements and compounds.
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What 2 states of matter does a Supercritical Fluid exist in?
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What are supercritical fluids used for?
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What piece of equipment is this?
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What piece of equipment is this?
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What type of equipment is this?
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What type of equipment is this?
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Which of the following best describes what happens when you pass the critical point on a phase diagram?
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What state of matter is Letter A in?
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What state of matter is Letter B in?
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What state of matter is Letter C in?
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At what point is letter E at?
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Study Notes
Elements and Compounds: Definition, Types, and Classification
- Chemistry is the study of the structures, physical properties, and chemical properties of material substances.
- Classification of matter is important because gases, liquids, and solids have different compositions.
- Elements are species of atoms with the same number of protons in their atomic nuclei.
- Isotopes are atoms of the same element with different numbers of neutrons.
- There are 118 elements, of which 94 are naturally occurring and 24 are synthetic.
- Elements cannot be broken down into simpler fragments and can exist as atoms or molecules.
- Compounds are substances consisting of two or more different types of elements in a fixed ratio.
- Compounds have new properties compared to their constituent elements.
- Compounds are represented by their chemical formula, which shows the proportions of atoms in the compound.
- There are two types of compounds: molecular compounds, which have covalent bonds, and salts, which have ionic bonds.
- Chemical bonds are the attractive interactions between atoms in a compound.
- Covalent compounds consist of molecules, while ionic compounds consist of positively and negatively charged ions.
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