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Questions and Answers
Which branch of chemistry focuses primarily on the study of compounds containing carbon?
Which branch of chemistry focuses primarily on the study of compounds containing carbon?
- Biochemistry
- Inorganic Chemistry
- Organic Chemistry (correct)
- Analytical Chemistry
Which type of matter has a fixed shape and volume?
Which type of matter has a fixed shape and volume?
- Liquid
- Plasma
- Gas
- Solid (correct)
What distinguishes inorganic chemistry from organic chemistry?
What distinguishes inorganic chemistry from organic chemistry?
- Inorganic chemistry focuses on metals and compounds without C-H bonds. (correct)
- Inorganic chemistry involves only gases and liquids.
- Inorganic chemistry is about molecules derived from living organisms.
- Inorganic chemistry studies carbon-containing compounds.
Which type of substance is defined as having a fixed chemical composition?
Which type of substance is defined as having a fixed chemical composition?
Which branch of chemistry applies principles of physics to chemical phenomena?
Which branch of chemistry applies principles of physics to chemical phenomena?
What best describes metalloids?
What best describes metalloids?
Which of the following substances is typically inorganic?
Which of the following substances is typically inorganic?
Which type of matter flows and takes the shape of its container while having a fixed volume?
Which type of matter flows and takes the shape of its container while having a fixed volume?
What type of mixture maintains the identity of its components?
What type of mixture maintains the identity of its components?
Which of the following is a chemical property?
Which of the following is a chemical property?
What is the smallest unit of a pure substance that retains its properties?
What is the smallest unit of a pure substance that retains its properties?
Which of the following describes an intrinsic property?
Which of the following describes an intrinsic property?
What type of change is a candle burning?
What type of change is a candle burning?
Which type of molecule consists of two or more different atoms?
Which type of molecule consists of two or more different atoms?
Which of the following is NOT a physical change?
Which of the following is NOT a physical change?
What describes a homogeneous mixture?
What describes a homogeneous mixture?
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Study Notes
Branches of Chemistry
- Organic Chemistry: Focuses on carbon compounds; essential for understanding the chemistry of life.
- Inorganic Chemistry: Studies compounds excluding carbon-hydrogen bonds, often involving metals.
- Analytical Chemistry: Involves the measurement of matter properties and the development of analytical tools.
- Physical Chemistry: Bridges chemistry with physics, utilizing thermodynamics and quantum mechanics.
- Biochemistry: Explores chemical processes occurring in living organisms.
Definition of Matter
- Matter: Physical material comprising everything with mass and occupying space.
Classification of Matter by Physical State
- Solids: Characterized by fixed shapes and volumes.
- Liquids: Maintain fixed volumes but adapt to the shape of their containers.
- Gases: Lack fixed shapes and volumes, expanding to fill their containers.
Composition of Matter
- Pure Substances: Have fixed chemical compositions and distinct properties.
- Elements: Cannot be decomposed chemically.
- Metals: Good conductors, malleable, and ductile.
- Nonmetals: Poor conductors, not malleable or ductile.
- Metalloids: Intermediate properties, some can conduct electricity.
- Compounds: Combinations of elements with distinct properties, can be organic (carbon-hydrogen bonds) or inorganic (no carbon-hydrogen bonds).
- Elements: Cannot be decomposed chemically.
- Mixtures: Combinations of pure substances where the components retain their identity.
- Homogeneous Mixtures: Uniform composition throughout.
- Heterogeneous Mixtures: Non-uniform composition.
Properties of Matter
- Properties: Characteristics that help identify and distinguish types of matter.
- Physical Properties: Observable without changing composition.
- Chemical Properties: Observed when altering composition.
- Intrinsic Properties: Independent of the amount of material.
- Extrinsic Properties: Dependent on the amount of material present.
Changes of Matter
- Physical Changes: Do not alter the substance's composition. Example: cutting paper.
- Chemical Changes: Involve a change in composition. Example: burning magnesium.
Composition of Matter
- Atoms: Basic unit of chemical subdivision.
- Molecules: Smallest particle of a pure substance, capable of stable independent existence.
- Diatomic Molecules: Two atoms.
- Polyatomic Molecules: More than two atoms.
- Homoatomic Molecules: Single type of atom.
- Heteroatomic Molecules: More than one type of atom.
Example Problem: Classifying Changes
- Physical Changes:
- Condensation of steam
- Ice melting
- Dissolving sugar in water
- Melting of gold
- Magnetizing a screwdriver
- Chemical Changes:
- Burning of gasoline
- Souring of milk
- Burning coal
- Mixing chocolate syrup with milk
- Explosion of a firecracker
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