CHEM ONE

• A gas is a form of matter that does not have a definite volume or shape.
• A pure substance is a substance that cannot be physically separated and only has one substance, including elements, atoms, compounds, molecules, diatomic molecules.
• A heterogeneous mixture is not mixed evenly.
• A homogeneous mixture is mixed evenly, is the same throughout.
• In a mixture, each type of matter retains its own properties.
• A mixture is a combination of different types and amounts of matter that are physically combined.
• Many gases are diatomic, such as O2, H2, N2, F2, Cl2.
• A diatomic molecule is a molecule formed by two identical atoms.
• A molecule is the smallest unit of a compound.
• A compound has properties unlike the elements that make it up.
• A compound must be separated by chemical means.
• A compound cannot be separated by physical means.
• Atoms bond in a fixed ratio in a compound.
• A compound is a substance made of two or more different elements that are chemically combined.
• An atom may lose, share or gain electrons when bonding.
• An atom is the smallest unit of an element.
• A pure substance is a substance made of one kind of atom that cannot be broken down or changed by usual means, with about 118 known elements.
• Matter is anything that has mass and takes up space.
• Radiation is the transfer of energy by electromagnetic waves.
• Phase Changes are when substances change phases by adding or subtracting energy.
• Plasma is a gas-like state of matter consisting of charged particles.
• Convection current is the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another.
• MELTING is the change in state from a solid to a liquid.
• Examples of physical properties include color, odor, mass, density, specific heat, malleability, ductility, conductivity, melting point, boiling point, magnetism.
• The freezing point of water is 0 degrees Celsius and 32 degrees Fahrenheit.
• States of Matter include solid, liquid, gas, plasma.
• Physical properties are characteristics that can be observed without changing the identity of the substance.
• Conduction is the direct transfer of heat from one substance to another substance that it is touching.
• Deposition is the change from a gas to a solid.
• Heat is the energy transferred between objects that are at different temperatures.
• Convection is the transfer of thermal energy by the circulation or movement of a liquid or gas.
• Gas is a state of matter that has no definite shape or volume.
• Water Phase Change involves solid>melting>liquid>vaporization>gas.
• FREEZING is the change of state from a liquid to a solid.
• Heat transfer is the movement of energy from a warmer object to a cooler object.
• Solid is a state of matter that has a definite shape and a definite volume.
• Temperature is a measure of the average energy of motion of the particles of a substance (avg KE).
• Thermal energy is the total energy of all the particles of an object.
• Mass is the amount of matter in an object.
• Phase with the highest energy is Plasma.