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Science > Chemical Reactions Unit > Flashcards

Chemical Reactions Unit Flashcards

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0
Q

What is the most important sin of a chemical reaction?

A

A change of properties

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1
Q

What are four signs of a chemical reaction?

A

Gas formation, solid formation, energy change, and color change

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2
Q

What must happen for a chemical reaction to take place?

A

The original bonds must break and new bonds form

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3
Q

What are reactants?

A

The starting material in a chemical reaction

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4
Q

What are products?

A

The substances formed from a reaction

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5
Q

What elements replace others in single displacement?

A

A more reactive element displaces a less reactive element

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6
Q

What is one of the products if a double displacement reaction?

A

A gas or precipitate

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7
Q

What are three types of energy released in exothermic reactions?

A

Light energy, electrical energy, and thermal energy

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8
Q

What is an example of a endothermic reaction?

A

Photosynthesis

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9
Q

What two conservation laws are there?

A

Law of conservation of energy and mass

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10
Q

What is an activation energy?

A

The boost of energy that causes the reaction to start

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11
Q

What are four factors that affect rates of reactions?

A

Temperature, concentration, surface area, and inhibitors

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12
Q

What is a catalyst?

A

A substance that speeds up a reaction without being permanently changed

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13
Q

What is an inhibitor?

A

A substance that slows down or stops a helical reaction

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14
Q

In an endo and exothermic graph, what is the first straight line for?

A

Reactants

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15
Q

In an exothermic reaction, what is the hill and part of the downhill for?

A

The activation energy

16
Q

In an exothermic reaction, what is the last part of the downward hill for?

A

Energy given off

17
Q

In an endo and exothermic reaction, what is the last straight line for?

A

The products

18
Q

In an endothermic reaction, what is the upward hill for?

A

Activation energy

19
Q

In an endothermic reaction, what is the first part of the hill also?

A

Energy absorbed

20
Q

In the graphs, what is the x axis for?

A

Reaction progress

21
Q

In the graphs, what is the y axis for?

A

Energy

22
Q

What do the valence electrons do in ionic bonds?

A

Electrons are transferred

23
Q

What do valence electrons do in covalent bonds

A

Electrons are shared

24
Q

After tam chemical change takes place, what happened to the properties?

A

They can be different

25
Q

What makes chemical bonds break?

A

When the molecules bump into each other with enough energy.

26
Q

How many atoms make up a diatomic molecule?

A

2

27
Q

What are usually in covalent compounds?

A

Nonmetals

28
Q

What are ionic compounds made of?

A

A metal and nonmetal

29
Q

What is the charge of an ionic compound?

A

Neutral

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