Chapter 6 - Chemical Reactions: An Introduction Flashcards Preview

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Flashcards in Chapter 6 - Chemical Reactions: An Introduction Deck (63)
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Water is decomposed to…

Hydrogen and oxygen gas by an electric current

1

Grape juice ferments…

In the production of wives

2

Bombardier beetle concocts…

A toxic spray to shoot at its enemies

3

Chemical reactions are the…

Heart and soul of chemistry

4

Chemical reactions often give…

A visual signal

5

Steel changes from a smooth, shiny material to a…

Reddish brown, flaky substance when it rusts

6

Hair changes color when…

It's bleached

7

Solid nylon is formed when…

Two particular liquid solutions are brought into contact

8

A blue flame appears when…

Natural gas reacts with oxygen

9

Visual clues of chemical reactions are:

A color changes
A solid forms
Bubbles are produced
A flame occurs

10

Reactions are not always…

Visible

11

Sometimes the only signal that a reaction is occurring is a…

Change in temperature as heat is produced or absorbed

12

Chemists have learned that a chemical change always involves a...

rearrangement of the ways in which the atoms are grouped

13

when the methane in natural gas combines with oxygen in the air and burns...

carbon dioxide and water are formed

14

We represent a chemical reaction by writing a...

chemical equation

15

chemicals present before the reaction are called

the reactants - are shown to the left of an arrow

16

the chemicals formed by an reaction are called...

the products - shown to the right of an arrow

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arrow indicates...

the direction of the change and is read as "yields" or "produces"

18

the products contain the...

same atoms as the reactants but that the atoms are associated in different ways

19

chemical reaction involves...

changing the ways the atoms are grouped

20

It is important to recognize that in a chemical reaction...

atoms are neither created nor destroyed

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all atoms present in the reactants must be...

accounted for among the products

22

there must be the same number of...

each type of atom on the product side as on the reactant side of the arrow

23

making sure that the equation for a reaction obeys this rule is called...

balancing the chemical equation for a reaction

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a reaction is only a...

rearrangement of the way the atoms are grouped

25

atoms are not...

created or destroyed

26

the total number of each type of atom must be...

the same on both sides of the arrow

27

balanced equation shows...

the actual numbers of molecules involved in this reaction

28

when we write the balanced equation for a reaction...

we group like molecules together

29

the chemical equation for a reaction provides us with two important types of information

1. the identities of the reactants and products
2. the relative numbers of each