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Mid-Year 8

QuestionAnswer
How do we write what is happening in a chemical reaction? Chemical equation
What is a physical change? Provide an example. A change in a substance that does not change its identity (boiling water)
Is boiling point a physical property? Yes
What is a chemical change? Example. Change in which one or more substances combine or break apart to form new substances (rusted bike)
What is a pure substance? Example. A single kind of matter that has a specific makeup and set of properties (oxygen)
What is an element? A pure substance that cannot be broken down into other substances by chemical or physical means
Define weight. Measure of the force of gravity on you.
Define mass. Measurement of the amount of matter in the object.
Define density. Formula? Mass of a material in a given volume. m/v
Solve for density: 100g of mass with a volume of 50cm3 Density= 2cm3
Define an atom. The basic particle from which all elements are made.
Are atoms of different elements the same? No
How would you find the volume of an irregular shaped object? water displacement
What is used to measure the volume of a liquid? Graduated cylinder
Define matter. Anything that has mass and takes up space.
Mixture v.s. Compound Mixture: made of at least 2 substances that are together but not chemically combined Compound: pure substance made of at least 2 elements chemically combined
Example of mixture Soil
What can you predict from an element's location in the periodic table? If it's a metal, metalloid or nonmetal and its properties
Describe metal elements. Hard, good conductor of heat
Which group of elements contains the most elements? Metals
More than half of the nonmetals at room temperature are what state of matter? Gas
Define ductile. Drawn into a wire
The number of protons as equals the number of what? electrons
Define atomic number. number of protons in an atom
Which particle of an atom is outside of the nucleus? Electon
Define metalloids. Semiconductors (in between metals and nonmetals)
Define a solid, liquid, and gas. Solid: definite shape and volume Liquid: definite volume, no definite shape Gas: no definite shape or volume
Define Charles's Law. A principle that describes the relationship between temperature and volume of a gas at a constant pressure
Define sublimation. change in a state from solid directly to gas
Define surface tension. the result of an inward pulling among the molecules of a liquid that brings the molecules closer together; causes the surface to act as if it has thin skin
What is it called when a substance changes from a liquid to a solid? Freezing
The freezing point of water is the same as its_____ point. Melting
Define vaporization. Change in state from a liquid to gas.
Define condensation. Change in state from gas to liquid
The opposite of vaporization is what? Condensation
Define a fluid. Any substance that can flow
The amount of space an object takes up is called its what? Mass
Created by: jazzyylyy
 

 



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