FlashDash ← Public Lessons
Science Test 11-2-26
Q
The smallest unit of an element that retains its chemical identity.
A
Atom
Q
A pure substance containing only one type of atom.
A
Element
Q
Two or more atoms chemically bonded together.
A
Molecule
Q
A substance containing atoms of two or more different elements chemically combined.
A
Compound
Q
Uses symbols and subscripts to identify the elements and numbers of atoms in a substance.
A
Chemical Formula
Q
Tells how many atoms of the element immediately before they are present.
A
Subscript
Q
Is a coefficient in front of before the formula?
A
In front
Q
True or false. The coefficient doesn't multiply into the entire formula.
A
False
Q
Represented by formula units rather than individual molecules.
A
Ionic Substances
Q
Describes an atom's combining capacity.
A
Valence
Q
What helps predict the ionic charges and bonding patterns of valence electrons?
A
The Periodic Table
Q
What is the charge in groups 1-3 10-13?
A
Negative
Q
What is the charge in groups 5-8 15-18?
A
Positive
Q
How many bonds do group 14 elements make?
A
4 bonds, they can be positive or negetive
Q
What do molecular models show?
A
How atoms bond together
Q
Rearranging the atoms changes ____, but doesn't ___, or _____ atoms.
A
substance, create, destroy
Q
How many bonds does hydrogen make?
A
1
Q
How many bonds does chlorine make?
A
1
Q
How many bonds does oxygen make?
A
1
Q
How many bonds does nitrogen make?
A
3
Q
How many bonds does carbon make?
A
4
Q
What makes a mixture?
A
Substances physically combined
Q
What is the physical property used when using magnetism?
A
Magnetic Attraction
Q
What is the physical property used when using filtration?
A
Partical size and insolubility
Q
What is the physical property used when using evaporation?
A
Volatility/ ability to vaporize
Q
What is the physical property used when using dissolving?
A
Solubility
Q
What is the physical property used when using sieving?
A
Particle size
Q
True or false. Separating a mixture does not ordinarily change the chemical identity of its components.
A
True
Q
A + B -> AB
A
Synthesis
Q
AB -> A + B
A
Decompostion
Q
A + BC -> AC + B
A
Single replacement
Q
AB + CD -> AD + CB
A
Double Replacement
Q
Fuel + O2 -> products
A
Combustion
Q
Smaller substances combine into one product.
A
Syntheis
Q
One compound will break into simpler substances.
A
Decompostion
Q
One element replaces another in a compound.
A
Single replacement
Q
Ions from two compounds exchange partners.
A
Double Replacement
Q
A substance reacts with oxygen (burn) and releases energy. Produces CO2 and H2O if carried out fully.
A
Combustion
Q
What is evidence of a chemical reaction?
A
Gas production, temperature change, color change, or formation of a new solid.
Q
When the bag is sealed the mass at the start should be...
A
equal to the ending mass.
Q
In an enclosed chemical reaction matter is...
A
neither created nor destroyed during the chemical reaction.
Q
Every atom present before the reaction must still be present after for ____ t be carried out.
A
The Laws of Conservation of matter
Q
A sentence written in a specific code that describes the kind and number of each kind of materials involved in a reaction.
A
A chemical equation
Q
True or False. A chemical equation is balanced when each element has the same number of atoms on both sides.
A
True
Q
Physical or Chemical Change? Cutting paper
A
physical
Q
Physical or Chemical Change? Burning wood
A
chemical
Q
WHat makes up a physical change?
A
Change in form, state, or arrangement without changing chemical identity
Q
What makes up a chemical change?
A
Production of one or more new substances