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Chemistry > Unit 2- physical and chemical changes > Flashcards

Unit 2- physical and chemical changes Flashcards

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1
Q

energy

A

capacity for doing work or producing heat

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2
Q

physical change

A

does not change the identity of a substance

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3
Q

chemical change

A

forming something new with new properties

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4
Q

evaporation

A

vaporization at the surface of a liquid

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5
Q

endothermic

A

process that absorbs heat from the surroundings

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6
Q

exothermic

A

process that releases heat into the surroundings

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7
Q

law of conservation of energy

A

energy is neither created or destroyed

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8
Q

heat

A

energy that transfers from one object to another because of a difference in temperature

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9
Q

kinetic energy

A

energy of motion

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10
Q

potential energy

A

stored energy

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11
Q

temperature

A

measurement of heat or kinetic energy

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12
Q

chemical

A

a substance with a chemical formula

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13
Q

chemical reaction

A

change in which one or more reactants change into new products

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14
Q

states of matter

A

solid, liquid or gas

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15
Q

reactant

A

substance(s) that start a chemical reaction

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16
Q

product

A

substance(s) that are produced in a chemical reaction

17
Q

matter

A

anything that has mass and takes up space

18
Q

physical property

A

quality of a substance that can be observed without changing the substances’ composition

19
Q

chemical property

A

ability of a substance to undergo a chemical reaction

20
Q

atom

A

smallest part of an element

21
Q

pure substance

A

substances with a unique set of physical and chemical properties - element or compound

22
Q

element

A

simplest form of matter that cannot be broken down into simpler substances

23
Q

molecule

A

group of atoms held together with covalent bonds

24
Q

compound

A

made of 2 or more kinds of atoms chemically combined in a fixed proportion

25
Q

mixture

A

physical blend of 2 or more substances that are not chemically combined

26
Q

homogeneous

A

same throughout

27
Q

heterogeneous

A

visibly different throughout

Chemistry (5 decks)

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