6th grade Elements, Molecules, Compounds, and Mixtures
Compound
A substance made up of atoms of two or more different elements bonded together
Is Hydrogen gas (H2) a molecule or compound? Explain.
H2 is a molecule, not a compound because it is made of only one element.
Is WATER (H2O) an element or a compound? Explain.
H2O can be called a molecule or a compound because it is made of Hydrogen and Oxygen atoms.
H20
water
Molecules are made of how many atoms?
2 or more
All organic compounds contain
Carbon
O2
Oxygen
In a chemical formula, what is used to indicate the number of elements present?
Subscripts
O3
ozone molecule
H2sO4
sulfuric acid
Chemical Bonds
the result of the sharing or exchanging electrons among the atoms.
How is a molecule formed?
when two or more atoms bond together chemically
In what ways can you separate a mixture?
you can separate a mixture by filtration, evaporation, magnetic effect
covalent bond
A chemical bond formed when two atoms share electrons
What is the difference between an atom, element, molecule, compound, and mixture?
An atom is the basic building block for all matter. An element is a substance that is not able to be broken down chemically. A molecule is an element that bonds with the same atoms or different atoms. A compound is a chemical substance formed when 2 or more different elements bond in a specific proportion. A mixture is composed of two or more different elements or compounds that are not chemically combined.
Elements are substances that are not able to be broken down ________________________.
Chemically
In a chemical formula, what is used to describe the elements present?
Symbols
Describe the atoms in a molecule?
The atoms can be the same or different.
What is an atom?
The basic building block for all matter.
What happens to the elements when a compound is formed?
The elements lose their individual chemical properties and the compound has new properties.
How do element bonds form?
These bonds form as a result of the sharing or exchange of valence electrons among atoms.
What is the recipe for a chemical substance called?
a chemical formula
What is a molecule?
a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound.
What is the smallest unbreakable unit of a compound called?
a molecule
what is a chemical equation?
a short, easy way to show a chemical reaction, using symbols instead of words
What is an element?
a substance consisting of a single type of atom
CO2
carbon dioxide
A _______________ is a chemical substance formed when two or more different elements bond in a specific proportion
compound
What does a coefficient tell you?
number of molecules
If no coefficient appears in front of a molecule, we interpret this as meaning _______________.
one (example: H + 2Fe) the coefficient 2 represents 2 Iron molecules and since there is no coefficient in front of the H, there is only one Hydrogen molecule.
What are some examples of elements?
oxygen, aluminum, gold
Where are elements located?
periodic table
Elements are ________ substances.
pure
Elements can bond with the _____________ atoms or ________________ atoms.
same, different
What is the number in front of the element symbol called in a chemical equation?
the coefficient
what does a chemical formula tell you?
the number and types of atoms in a molecule
What does a chemical formula tell you?
the number of atoms of each element in a compound or molecule.
