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27 Cards in this Set
- Front
- Back
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name some physical properties
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boiling/melting point
attraction to a magnet ability 2 flow size shape color ability to strech and bend state of matter |
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waht is considered a physical change in a substance?
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when the identity of the element doesnt change
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wahts distillation?
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a process for seperating substances in a mixture by evaporating a liquid and recondensing its vapor
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wahts a chemical change?
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a change of 1 substance 2 another
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waht r some clues that a chemical change has taken place?
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rotting, rustting, burning, heat, cooling, formation of bubbles, or solids in a liquid
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in terms of substance explain y evaporation of water is a physical change and not chemical
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the water keeps the same identity h2o and its a change in state of matter
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name 4 physical properties u could use 2 describe a liquid
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ability 2 flow, color, temperature, taste
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how does the law of conservation of mass apply 2 chemical changes?
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since it doesnt add or take away mass its creating a new substance which replaces the old 1
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whats the law of conservation of mass?
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mass can neither be created nor destroyed
mass of a substance b4 a chemical change = mass of a substance after a chemical change |
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when a candle burns how do u no a physical and chemical change have taken place?
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physical-the wax melts into a new shape
chemical-burning, gas, heat, and light r given off |
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most chemical changes can be identified by waht 4 properties?
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gas given off
new color heat and light precipitate-solid that forms at the bottom of a liquid |
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waht r the building blocks of substances called?
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atoms
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if all the atoms in a substance r the same its called what?
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an element
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how many elements r occuring in nature?
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90
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how many elements have been made in laboratories?
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over 20
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name 5 elements.
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hydrogen, helium, boron, carbon, gold
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y is pure tungsten used 4 filaments in lightbulbs?
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because it has the highest melting point of any metal its soft enough 2 be stretched 2 form the filament
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y do dentist drape a lead apron on patients b4 taking x-rays?
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becuz of its high density its a good barrier 2 radiatiob
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how is chalk a compound?
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it contains more then 2 atoms and they r in a fixed proportion
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waht is the fixed proportion of water?
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2 atoms of hydrogen 1 atom of oxygen
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how r elements compounds and mixtures different?
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element-only 1 type of atom
compound-2 or more atoms in a fixed proportion mixture-2 or more substances that arent in a fixed proportion |
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classify each as element compound or mixture
copper wire salt vinegar aluminum chalk granite sugar water sand water soil soda air carbon dioxide gold bronze oxygen salad dressing salt water |
element
compound homogeneous mixture element compound heterogenous mixture homogenous mixture heterogeneous mixture compound heterogenous mixture b4 opened-homogenous mixture after opened-heterogeous mixture homogenous mixture compound element homogenous mixture element heterogeneous mixture homogeneous mixture |
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whats another word for homogeneous mixture?
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solution
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waht is solvent?
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the substance that ur mixing something into
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waht is solute?
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waht u put into the solvent
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whats dilute?
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alot of solvent not much solute
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wahts concentrate?
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alot of solute not much solvent
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