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8th Grade Review -Matter: Properties and Change
Terms in this set (80)
Pure substances that can't be changed into simpler substances holding the same properties
Pure substances composed of 2 or more elements chemically combined
Physical combinations of 2 or more different substances that retain their own individual properties
filtration, sifting, evaporation
Ways to separate mixtures physically
Not uniform mixture, component substances visibly distinguished, (ie, tossed salad, granite, iced tea)
Uniform throughout, substances evenly mixed (ie, air, steel, clear salt-water)
State of Matter, atoms closely locked in position and can only vibrate
State of Matter, atoms and molecules can collide with and move past one another
State of Matter, in gases, the atoms and molecules move independently, colliding frequently
State of Matter, form a pattern that minimizes structural energy
State of Matter, at melting point temperature, atoms or molecules have enough energy to flow
State of Matter, atoms or molecules move about freely and collide randomly with the walls of a container and with each other; distance between molecules is much greater than in other states
What has a relationship with the phase or state of matter, and is described as the mass per amount of volume?
What interacts to form molecules or crystals?
Horizontally in order of increasing atomic number (number of protons)
How is the periodic table of elements arranged?
Who is credited with the creation of the basis for our modern-day periodic table?
How many confirmed elements are on the Periodic Table?
What shows the atoms of the elements composing a substance? The first letter is always capitalized.
What is the number written to the lower right of the element symbol?
Protons, neutrons, electrons
What are the subatomic particles that atoms are composed of?
Protons and neutrons
Which subatomic particles are always located in the nucleus of the atom?
What is the charge of the atom if there are equal numbers of electrons and protons?
What charge does a neutron in an atom have?
What subatomic particle has a positive charge?
What subatomic particle has a negative charge?
What can physical and chemical properties be used to identify?
Is SHAPE a physical or chemical property?
Is ACIDITY a physical or chemical property?
Is COMBUSTIBILITY a physical or chemical property?
Is DENSITY a physical or chemical property?
Is SOLUBILITY a physical or chemical property?
Is ODOR a physical or chemical property?
Is MELTING POINT a physical or chemical property?
Is BOILING POINT a physical or chemical property?
Is COLOR a physical or chemical property?
Is BASICITY a physical or chemical property?
is REACTIVITY a physical or chemical property?
Are these physical or chemical changes: size, shape, state?
Are these physical or chemical changes: color, temperature, formation of gas, formation of precipitate?
What kind of change occurs when a different substance is formed?
What do we know has occurred if a substance is broken apart or when substances are combined and at least 1 new substance is formed?
The temperature at which a solid can change to a liquid
The temperature at which a liquid boils
0 degrees Celsius
Ice melts to form liquid water at what temperature in Celsius?
32 degrees Fahrenheit
Ice melts to form liquid water at what temperature in Fahrenheit?
100 degrees Celsius
The boiling point for pure water at se level is what temperature in Celsius?
212 degrees Fahrenheit
The boiling point for pure water at se level is what temperature in Fahrenheit?
Liquid to a Gas
During the process of boiling a substance changes from a ___ to a ___
Substances that have ____ densities contain more matter in a given volume.
Is the density of lead GREATER or LESS than the density of aluminum?
Absence of color is a ___ property.
If a substance reacts quickly with oxygen to produce light and heat, it may have the ability to ____.
Some metals react with various ______ to form compounds. All metals to not react with these.
Bases react with acids to form water and ____ the acid.
What are these evidences of? Change in state of matter, change in size or shape
What are these evidences of? color change, temperature change, formation of a precipitate, or formation of gas
When two solutions are combined, they may form a solid substance called a __.
precipitate / chemical change
What is this an example of? When carbon dioxide is combined with aqueous calcium hydroxide (limewater), solid calcium carbonate (chalk) is formed.
Cloudiness of very small particles settled in a solution or as a solid in the bottom of a container could be the result of the formation of a ___.
When vinegar is added to baking soda, it forms ____ gas bubbles.
Reaction rates can be changed by changing the concentration of ___.
___ rates can be changed by using a catalyst, changing the temperature or by changing the surface area of solids.
Solutions can be acidic, basic, or ___.
Neutral solutions have a pH of ___
Pure water has a pH of ___.
Blue Litmus paper turns red if the solution is ___.
Red Litmus paper turns blue if the solution is ___.
pH paper, Litmus paper, and phenolphthalein are all ___ used to distinguish acids and bases
A Chemical ___ can be used to represent a chemical reaction.
"yields" or "makes"
The arrow in a chemical equation means ____.
The substances broken apart or combined in a chemical reaction are called ___.
New substances formed in a chemical reaction are called ___.
The amount of matter does not change in a chemical reaction. The ____ are rearranged to form new substances.
The amount of ____ cannot be destroyed or created, but it can be changed when materials react with each other.
Law of Conservation of Matter
What law does a balanced chemical equation support?
Hydrogen gas reacts with oxygen gas to form ___.
How many atoms does a molecule of Hydrogen have?
How many atoms does a molecule of Oxygen have?
How many atoms of Hydrogen does a molecule of water have?
How many atoms of Oxygen does a molecule of water have?
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