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27 Cards in this Set

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