Elements, Compounds, & Mixtures

Classifying Matter:

Elements, Compounds, & Mixtures

Matter is classified into 4 main categories:

• Atoms

• Elements

• Compounds

• Mixtures

Multiple Choice

This contains a variety elements and compounds that ARE NOT chemically combined.

• Water

• Mixture

• Elements

• Compounds

Multiple Choice

A substance made of only one type of atom is called —

• an element

• a mixture

• a compound

• a salt

Multiple Choice

1 A substance made up of two or more chemically combined elements is —

• an element

• mixture

• compound

• solution

Multiple Choice

A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture

Atoms

• The basic building block of all matter.

• Made up of protons (+), neutrons (0), and electrons (-).

• Different atoms have different numbers of these energy particles

Elements

• Pure substance

• Made up of identical atoms

• Cannot be separated into a simpler substance by physical or chemical means

Periodic Table

• Developed by Dmitri Mendeleev.

• A way of organizing all of the known elements.

• Elements are organized by the number of protons.

Multiple Choice

Elements can be broken down into simpler substances.

• false

• true

• sometimes

Multiple Choice

A molecule can be made of the same kind of atoms.

• true

• false

• Say What??!!!

• Dude!! Sweet!!

Multiple Choice

Water is a(n) ___________.

• element

• mixture

• compound

Compounds

• Pure substance.

• Made up of two or more different elements joined by chemical bonds.

• Made of elements in a specific ratio that is always the same

• Has a chemical formula

Chemical Formula

• Specific ratio of elements in a compound

• Makes it easier to describe elements and molecules

• C + O₂ = CO₂ = Carbon Dioxide

• N + H₃ = NH₃ = Nitrogen Trihydride (Ammonia)

Chemical Reactions

• Process where different compounds react to form new compounds

• Happens when Individual atoms from both compounds break their chemical bonds,Separate from their compounds, and

• Form new chemical bonds with other recently-separated atoms.

Multiple Choice

NaHCO₃ is an example of —

• an abbreviation

• a compound

• a mixture

• an element

Multiple Choice

Contains only one kind of atom.

• Element

• Compund

• Mixture

Multiple Choice

Which of the following is a way in which elements and compounds are similar?

• Elements and compounds are pure substances.
• Elements and compounds are both made up of different kinds of atoms.
• Elements and compounds can both be broken down by physical means.
• Elements and compounds are listed on the periodic table.

Multiple Choice

A substance that cannot be broken down into any other substance by ordinary chemical means is called —

• molecule

• mixture

• element

• compound

Multiple Choice

1 A substance made up of two or more chemically combined elements is —

• an element

• mixture

• compound

• solution

Mixtures

• A combination of two or more pure substances that are not chemically bonded.

• Substances held together by physical forces, not chemical.

• No chemical change takes place.

• Each item retains its properties in the mixture.

• Can be separated physically. 

Types of Mixtures

• There are two types of mixtures: homogeneous and heterogeneous.

Homogeneous

• The components of a homogeneous mixture are uniformly distributed so the composition is the same throughout the mixture. (ex: steel, milk, kool-aid, blood).

Heterogeneous

• The components of a heterogeneous mixture are not uniformly distributed and are separated into their own regions in the mixture (ex: pizza, cereal in milk, Oil & Vinegar, mixed nuts, bowl of different candies).

Multiple Choice

A mixture that appears to be evenly mixed throughout:

• a homogeneous mixture

• a heterogeneous mixture

Multiple Choice

This is made up of one or more of the SAME kind of atom

• Element

• Mixture

• Compound

• Matter

Multiple Select

How many of the following are elements?

• Oxygen

• H₂O

• Salt

• Air

• Carbon

Multiple Choice

Oil floating refusing to mix with water is an example of?

• Homogeneous Mixture

• Heterogeneous Mixture

• Chemical Reaction

• Compound

Multiple Choice

gold, Au, is an example of a(n)

• element

• compound

• mixture

Multiple Choice

What is H₂SO₄ 
 made up of?

• 2 hydrogen, 1 sulfur, 4 oxygen
• 1 hydrogen, 2 sulfur, 4 oxygen
• 2 hydrogen & 4 sodium
• 1 hydrogen & 6 sodium