a stone is a crushedto powerd it's a physical change or chemical change
Answers
Answer:
Rock is crushed into powder. � Physical, it�s still rock with the same chemical identity � just divided into smaller particles. ... � A chemical change occurs such that the resulting product (table salt) has chemical properties dramatically different from either of its two constituents.
Answer:
Classify the following changes as physical or chemical:
(a) Grape juice turns into wine. Chemical
(b) Wood burns to ashes. Chemical with obviously different physical attributes
(c) Photographic film is exposed to light. Chemical
(d) Water begins to boil.� Physical, change of state
(e) A broken leg mends itself. Chemical, food is turned into bone
(f) Grass grows.� Chemical, sunlight and nutrients from soil are transformed into grass
(g) An infant gains 10 pounds.� Chemical, ingested food is converted to bone, fat, tissue, etc.
(h) Rock is crushed into powder.� Physical, it�s still rock with the same chemical identity � just divided into smaller particles.
Why are gases so easily compressed but not so with solids and liquids?� In the gas phase, the molecules are separated by large average distances which means there is a lot of empty space.� In liquid and solid phases the molecules are tightly packed and electrostatic forces prevent them from being squished together any further.
Eat metallic sodium and you die.� Inhale chlorine and you die.� Mix them together, however, and you sprinkle the product on your tomatoes for better taste.� What is going on?� A chemical change occurs such that the resulting product (table salt) has chemical properties dramatically different from either of its two constituents.� Moreover, the physical properties of the new compound differ greatly as well.� It is now a hard solid in the form of a small grain compared to the softness of sodium and the gas phase of chlorine.
The following questions refer to the diagrams on the handout.
One set of drawings represents a physical change and the other a chemical change.� Which is which?
����������� Top set: physical change:� solid symbol molecules under phase change (from gas to liquid or solid)
����������� Bottom set:� chemical change: open and solid symbol molecules dissociate and pair up with other elements to form new chemical compound/molecule.
Of the three boxes, which contains an elemental material, which a compound, and which is a mixture?� How many types of molecules are shown in all three boxes?
(a) mixture
(b) compound
(c) element
a total of three types of molecules are shown
The drawing on the left shows two phases of a single substance.� If enough heat were taken away then most of the particles in the gas phase would condense into the liquid or solid phase.� If heat were added then the solid crystalline phase portion of the left diagram would melt into a liquid (with particles still close together but at random distance and orientations) or turn into a gas phase (with particles at large average separations).� If each particle were a water molecule, what would be the temperature in the box on the left?� Answer: the temperature would be at most freezing (32 degrees Fahrenheit). If it were any higher than the crystalline solid phase would have melted away.
Explanation:
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