Chemistry: Matter Unit
How many characteristics of compounds are there?
3
How many characteristics of mixtures are there?
3
What are chemical changes?
A chemical reaction is a change that produces matter with a different chemical composition than the original matter. Chemical changes involve changes in energy. (ex: burning, oxidizing, rusting)
What is a qualitative observation?
A descriptive observation (quality).
What is a pure substance?
A kind of matter in which all similar samples have the same properties or characteristics.
What is a heterogeneous mixture?
A mixture in which the composition is not uniform throughout.
What is a homogeneous mixture?
A mixture in which the composition is uniform throughout.
What is a quantitative observation?
A numerical observation (quantity).
What is a mixture?
A physical combination of pure substances that retain their own individual properties.
What is an extensive property?
A property that depends on the amount of substance. (ex: mass, volume, weight)
What is an intensive property?
A property that does not depend on the amount of substance. (ex: color, density, boiling/melting point)
What is an element?
A pure substance composed of one type of atom that cannot be broken down by ordinary chemical change.
What is a compound?
A pure substance composed of the atom of two or more elements that are chemically combined.
What is the first characteristic of a mixture?
An element or compound has one set or properties, but a mixture retains all of the properties of its components.
What is an interpretation?
An opinion or judgement about what you observe.
What is matter?
Anything that has mass and occupies space.
What are the four classifications of matter?
Atom, element, compound, and mixture.
What is the second characteristic of a compound?
Chemical and physical properties of a compound differ from those of its components.
What is the third characteristic of a compound?
Compounds can be formed from simpler substances by chemical change. They can be separated the same way.
What is the first characteristic of a compound?
Elements making up a compound are combined in a definite proportion by mass.
What are the four evidences of chemical change?
Evolution of gas, formation of precipitate, formation of heat or light, and color change.
What are chemical properties of matter?
How matter reacts when it comes in contact with other substances. (ex: burn, rust, explode)
What does it mean for something to be ductile?
It can be drawn (stretched thin) into wires.
What does it mean for something to be malleable?
It can be hammered into sheets (flat).
What is the third characteristic of a mixture?
Mixtures can be homogenous or heterogeneous.
What are physical changes?
Physical changes do not affect chemical composition. (ex: If a substance goes from a solid to a liquid this is a physical change some the chemical composition does not change)
What are physical properties of matter?
Properties that can be observed without producing new substances. (ex: color, taste, texture, etc.)
What are the four states of matter?
Solid, liquid, gas, and plasma.
What is the second characteristic of a mixture?
The composition of compounds are fixed, but the composition of mixtures can vary.
What is an atom?
The smallest unit of an element (the building block of matter).
What is an observation?
The use of your senses to obtain information about matter.
How can mixtures be separated?
Through distillation and filtration.
