Chapter 3: Reactions Flashcards

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1
Q

What is a chemical reaction?

A

A chemical reaction is a process where atoms are rearranged to make new substances with the atoms joined together in different ways

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2
Q

What are the substances you start with?

A

Reactants

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3
Q

What are the things you end with?

A

Products

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4
Q

What can you represent a reaction with?

A

A word equation

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5
Q

What is an example of a balanced symbol equation?

A

2Cu + O(squared) = 2CuO, the balanced symbol equation shows the formula of each substance in the reaction, how the atoms are rearranged and the relative number of atoms of each substance

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6
Q

What might you see if a chemical reaction is happening?

A

Flames or sparks, notice a smell, hear fizzing or banging, feel the temperature of the reaction mixture going up or down

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7
Q

What can you add to a reaction to make it faster?

A

A catalyst which is used to help the reaction along and not speed it up

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8
Q

What’s the difference between a chemical reaction and a physical reaction?

A

Chemical reactions are irreversible (usually) while physical reactions can be reversed

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9
Q

What is a type of endothermic reaction?

A

Thermal decomposition where the temperature of the surrounding decrease and the energy moves from the surroundings to the reaction mixture

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10
Q

What is a type of exothermic reaction?

A

Combustion, where the temperature of the surroundings increase and the energy is moved from the reaction mixture to the surroundings

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11
Q

What is conservation of mass?

A

When a chemical reaction happens atoms aren’t destroyed but they are made, the total mass of reactants are always the same as the total mass of the products

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12
Q

What is an example of a physical change

A

When water freezes it turns to ice so on so on

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13
Q

What are 3 different types of a reaction?

A

Decomposition, thermal decomposition, oxidation, combustion

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