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MJHS 7 Unit 2

Unit 2 Test Study Physical and Chemical Changes of Matter

QuestionAnswer
The study of matter and its changes is called Chemistry
A specific type of atom with its own properties is a(n) Element
Two or more atoms bonded together in a specific ratio is called a(n) Compound
The smallest unit of a substance that is made up of 2 or more elements is called a(n) Molecule
Substances that are combined physically, but not chemically are said to be Mixtures
A well mixed mixture in which particles cannot be seen is a Solution
A change that does not produce a new substances is called a Physical change
When new substances are formed, this type of change has occured. Chemical change
Sometimes, during a chemical reaction between two liquids, a solid is formed witin the liquids. This solid suspended in the liquid is called a Precipitate
The smallest unit of matter is called the Atom
Smoke, fire, bubbling and change of color are all evidence of this. Chemical change or reaction
Dissolving, mixing or breaking a substance is evidence of this. Physical change
Color, density, boiling point and state of matter are all these types of properties. Physical
Flammability, reactivity and combustibility are all these types of properties. Chemical
A sentence showing a chemical change with symbols is called a Chemical equation
During a chemical reaction, this cannot be created or destroyed. Matter
The large number present in front of the molecule symbol is called the Coefficient
The small number that is sometimes present next to and slightly below the element symbols is called the Subscript
This number tells the number of molecules Coefficient
This number tells the number of atoms Subscript
What word does the arrow stand for in a chemical reaction sentence? Yields
When hydrogen peroxide breaks down into water and oxygen gas, this type of reaction has occured. Decomposition
When hydrogen gas and oxygen gas come together to make water, this type of reaction has occured. Synthesis
When the copper in copper sulfate trades places with the iron in a nail, this type of reaction has occured. Replacement
The three parts of the fire triangle are oxygen, heat and Fuel
What part of the fire triangle do firefighters try to remove first? Heat
A solution is a well mixed: Mixture
The part of the solution that does the dissolving is the Solvent
The part of the solution that gets dissolved is the Solute
In Kool Aid, what is the solute? Kool Aid Powder Mix
This substance is sour, corrosive and has a pH of 6 or less. Acid
This substance is bitter, slippery and has a pH of 8 or higher. Base
Fruits are usually classified as Acids
Soaps and cleaning products are usually classified as Bases
Which is a stronger base, milk or bleach? Bleach
Which is a stronger acid, HCl or fruit juice? HCl
Which pH is neutral? 7
The pH scale is actually a measure of the concentration of Hydrogen ions
The higher the pH, the lower the number of Hydrogen ions
The lowest pH possible is Zero
The highest pH possible is Fourteen
The dense solid core of an atom is called the Nucleus
The positively charged part of the atom Proton
The smallest subatomic particle is the Electron
The neutral particle in the nucleus Neutron
Who was the first to suggest an atomic model? Dalton
His gold foil experiment proved the atom was mostly empty space Rutherford
His plum pudding model showed both positive and negative parts of the atom. Thomson
His model shows the atom model much like a solar system with orbiting electrons. Nagaoka or Bohr
This number on the periodic table corresponds to the number of protons Atomic number
This number on the periodic table corresponds to the number of protons plus the number of neutrons Atomic mass
Scandium (Sc) is atomic number 21 and has an atomic mass of 45. How many protons does scandium have? 21
Scandium (Sc) is atomic number 21 and has an atomic mass of 45. How many neutrons does scandium have? 24
A vertical column of elements on the periodic table is called a Group or familiy
A row of elements on the periodic table is called a Period
How many families are there? 18
How many periods are there? 7
Helium and neon are both examples of Noble gases
Lithium and sodium are both examples of Alkali metals
Calcium and magnesium are both examples of Alkaline earth metals
The largest group of elements on the periodic table are the Transition metals
Elements found along the stair step line are the Metalloids
These elements are non metals that LOVE to bond with family 1 elements. Halogens
These metals react violently with water. They can even burst into flames IN the water. Alkali metals
How many NAMED elements are there? 112
Who is the father of the periodic table? Mendeleev
Created by: erica.sprague