Unit 2-Chemical Changes Flashcards Preview

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Flashcards in Unit 2-Chemical Changes Deck (23)
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1

balance chemical equations

hi

2

what are the five pieces of evidence for a chemical change

Color change,
formation of gas,
precipitate,
release or absorption of energy,
new odour

3

determine the type of reaction and predict the products

go

4

endothermic versus exothermic

endothermic reactions require energy

exothermic reactions create energy

5

what is the word equation for methane?

CH4

6

what is another way to write H2O?

HOH

7

define chemical change.
what happens in a chemical change?

A chemical change is a change in which at least one new substances formed, with different physical and chemical properties then the starting materials

New products are created

8

synthesis

A chemical reaction in which two or more substances combine to form a more complex sentence

A+B=AB

9

Decomposition

Chemical reaction in which compound is broken down into two or more simpler substances

AB=A+B

10

combustion

The reaction of a substance with oxygen to produce oxides and energy

most commonly used to produce heat

11

Combustion of a hydrocarbon produces...

H2O and CO2

12

Single displacement

reaction of an element with the compound to bring us a new element and a new compound activity series will be used

A+BC=AC+B

13

why is hydrogen placed with the metals on the activity series?

hydrogen acts like a metal so it is on the list of metals (loses electrons) it becomes positively charged

14

how to use activity series

anything that is higher on the activity series will form the compound by displacement

15

Double displacement

this is the reaction in which compounds rearrange and form new compounds.

solutions that may or may not have precipitates

AB+CD=AD+CB

16

neutralization

a double displacement reaction between an acid and a base to produce an ionic compound (a salt) and water

17

balancing

put a 1 before compounds with no number out front

18

what occurs during a chemical change?

a new substance is created

bonds break or form because of their attractive forces

19

endothermic and example

The reaction needs a continuous supply of energy put into the system
example copper he did over the Bunsen burner the reaction stopped when the heat stopped

20

exothermic and example
(find one)

A reaction that releases much more energy then what was put into the system

21

acid rain causes

factors that lead to acid rain are transportation, heating homes, and coal burning factories

22

what is the equation for acid rain?

blank

23

what are the five types of reactions?

synthesis, decomposition, combustion, single displacement, double displacement