Vocabulary
Define the vocabulary terms "Element"
An element is a pure substance made of only one type of atom that cannot be broken down by chemical means.
Which state of matter has a DEFINITE shape & a DEFINITE volume?
Solid
What is a Phase Change?
A Phase change is a physical change in which matter changes from one state to another.
What is an element?
An element is a PURE substance made of only one type of atom.
In which state of matter do particles move the LEAST?
Solid(s)
Define the vocabulary term "Physical Change"
A characteristic of a substance that can be observed or measured without changing its chemical identity (e.g., color, density, melting point).
Particles for a gas are ________ __________.
(2 words)
Far Apart
What is the name of the phase change from when a liquid turns into a solid?
Freezing
What is a compound?
A compound is a PURE substance made of 2 or more different elements chemically joined together.
Is CO2 (Carbon Dioxide) an element OR a compound?
Compound; where 2 elements are chemically bonded together: 1 Carbon + 2 Oxygen = CO2
Define the vocabulary term "Suspension"
A heterogeneous mixture where solid particles are dispersed in a liquid or gas, large enough to settle out over time.
Which state of matter has a DEFINITE volume but DOES NOT have a DEFINITE shape?
Liquid(s); Liquids take up a fixed amount of space however they take the shape of its container.
________________ is the removal of thermal energy.
(Hint: Endo... or Exo...)
Exothermic
A _____________ mixture is a mixture that IS NOT evenly mixed throughout.
Heterogeneous
What is the energy change that happens with the phase change Sublimation ( Solid to Gas)?
(Hint: Heating or Cooling; Exo... or Endo...)
Heating/Endothermic; Ex. dry ice becoming a gas
Define the vocabulary term "Tyndall Effect"
The scattering of light by particles in a colloid or fine suspension, making a light beam visible in the medium.
In a solid, particles __________ in place but DO NOT move freely from one place to another.
Vibrate
An ice cube is left in the hot sun and returns back to its liquid state. Which phase change is this?
Melting
Kool-Aid, Soda, and sports drinks are all examples of what type of mixture?
Homogeneous Mixture
Is water (H2O) an element or a compound? Explain WHY.
Compound; H2O is chemically bonded together with 2 Hydrogen atoms and 1 Oxygen atom.
Define the vocabulary term "Law of Conservation of Mass"
In a closed system, mass is neither created nor destroyed during a physical or chemical change; the total mass of reactants equals the total mass of products.
What is Matter?
Matter is anything that has mass AND takes up space.
Early in the morning, water droplets form on the outside of a cold glass window. This example is which phase change?
(Hint: Gas to Liquid)
Condensation
A _____________ is a special type of homogeneous mixture.
Solution; where the solute is the substance that dissolves and where the solvent is the substance that DOES the dissolving = The Solution
Is trail mix considered as a heterogeneous mixture or a homogeneous mixture? Why?
Heterogeneous Mixture because trail mix contains a variety of food types; it is NOT evenly distributed throughout.