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Chemistry > Introduction to Chemical Reactions > Flashcards

Introduction to Chemical Reactions Flashcards

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1
Q

What is a chemical reaction?

A

the process by which a chemical change happens.

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2
Q

What are all chemical reactions accompanied by?

A

changes in energy

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3
Q

Define Endothermic Reactions.

A

reactions that absorb heat

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4
Q

What is the formula for an endothermic reaction?

A

Reactants + Heat →products

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5
Q

What is an exothermic reaction?

A

a chemical reaction that releases energy.

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6
Q

What is an example of a fast chemical reaction?

A

when rocket fuel burns

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7
Q

What is an example of a slow chemical reaction?

A

the formation of rust on a bicycle

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8
Q

The chemical reactions in your own body, which are keeping you alive, are among the fastest chemical reactions known.

A
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9
Q

Why are scientists constantly working to find new kinds of chemical reactions?

A

To produce new substances with useful properties.

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10
Q

What are reactants?

A

the starting material

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11
Q

What are the products?

A

the new substances or results

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12
Q

The products have different properties than the reactants.

A
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13
Q

What is a physical property?

A

a description of a substance that does not involve forming a new substance.

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14
Q

What are examples of physical properties?

A
  • colour
  • texture
  • state
  • density
  • solubility
  • melting point
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15
Q

What is a chemical property?

A

A description of what a substance does as it changes into one or more new substances.

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16
Q

What are examples of chemical properties?

A
  • combustibility
  • corrosion
  • reaction with acid
  • bleaching abilit
17
Q

What is a property?

A

it describes what a substance is like- similar to an adjective.

18
Q

What is a change?

A

if describes what the substance is doing - descriptions like a verb

19
Q

What is a physical change?

A

the change in the state or form of a substance that does not change the original substance - can result in new physical properties but not new chemical properties.

20
Q

What are the two types of physical change? - with examples

A

change in state -> dissolving, evaporation

change in form -> cutting paper in half

21
Q

What is a chemical change?

A

the transformation of one or more substances into new substances with new properties.

22
Q

What are the visual clues to a chemical change?

A
  • the presence of a new colour
  • the formation of a precipitate
  • release or absorption of heat
  • release of light
  • production of gas or bubbles
23
Q

What is a chemical equation?

A

a chemical equation uses either words or symbols and formulas to describe the changes that occur during a chemical reaction.

24
Q

What must every chemical reaction have?

A
  • one or more reactants
  • one or more products
  • an arrow between the reactants and products
  • and plus sign for multiple reactants or products.
25
Q

Remember diatomic molecules

A
26
Q

What is a catalyst?

A

a substance that makes a reaction happen faster without itself being consumed in the reaction

27
Q

What is a coefficient?

A

a whole number that is placed in front of the symbol of an element to show the ratios of the different substances that are present in the chemical reaction

28
Q

What is a chemical equation that does not have coefficients called?

A

and unbalanced or skeleton equation.

29
Q

What is the law of conservation of mass?

A

in a chemical reaction, the mass of the products always equals the mass of the reactants. - the mass is conserved

30
Q

Describe the conservation of mass in a chemical reaction.

A
  • no atoms are destroyed and no new atoms are produced
  • instead, the atoms in the reactants are simply rearranged to form the products
    chemical bonds between atoms are broken with new ones being formed
31
Q

When is an equation said to be balanced?

A

when the number of each kind of atom is the same in the reactants and products

32
Q

Never change a subscript in a formula to help make atoms balance

A

Chemistry (21 decks)

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