Chemical Changes Flashcards

1
Q

Physical change

A

A substances physical properties change, the particles of the substance stay the same, reversible
Ex: all state changes, clay molded into a new shape, bubbles in soda

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2
Q

Chemical change

A

A new substance is formed, not reversible

Ex: baking a cake, milk goes sour, rust on a car, bread becomes toast, making a fire

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3
Q

What happens during a chemical reaction

A

Two or more molecules interact and molecules change. Bonds between atoms are broken and created to form a new molecule

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4
Q

Indicators of chemical change

A
  • heat released or absorbed
  • Color change
  • gas released
  • light
  • precipitation
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5
Q

Factors that effect the speed of chemical reactions

A
  • surface area of solid reactant
  • concentration of pressure of reactant
  • temperature
  • nature of reactant
  • presence or absence of a catalyst
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6
Q

Oxidation

A

Reaction with oxygen

Ex: rust, browning apple

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7
Q

How can you slow down the process of oxidation on an apple?

A
  • cover in plastic
  • put lemon juice on it
  • put in fridge
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8
Q

Atom

A

Basic unit of a chemical unit, atoms form together to make molecules, which form the objects around you

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9
Q

Molecule

A

Made up of atoms, combine to form objects

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10
Q

Element

A

Substance consisting of atoms which all have the same number of protons

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11
Q

Compound

A

Two or more elements together

Ex: NaCl

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12
Q

Metals

A

On the left side and the middle

  • luster
  • malleable
  • good conductors (electricity and heat)
  • Usually solid (except mercury)
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13
Q

Matalloids

A

On the stair step

  • can have both properties of metals and non metals
  • can be shiny and brittle
  • semiconductors ( allows some electricity to pass through put not all ex: computer chips)
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14
Q

Nonmetals

A

On the right

  • dull
  • brittle
  • usually gasses
  • good insulators (bad conductors)
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