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Determining Chemical Activity. Concept :. A chemical reaction is said to occur when changes are observed, such as:. 1. When a given mass of substance disappears 2. There is a release of gas 3. There is a formation of precipitate 4. There is a change in colour

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Presentation Transcript
slide1

Determining

Chemical

Activity

slide2

Concept :

A chemical reaction is said to occur when changes are observed, such as:

1. When a given mass of substance disappears

2. There is a release of gas

3. There is a formation of precipitate

4. There is a change in colour

5. There is a change in mass

6. There is a change in temperature

slide3

The reactivity of metal is related to its ability to lose electron (i.e to be oxidized). It is possible to arrange nearly all the metals (even non-metals) with a single series in order of their reactivities. This series, known as the activity or electromotive series indicates which elements are capable of replacing other elements from their compounds.

slide4

In the list, the metals are arranged in such a way that the most active metals head the list, and the least active metal comes at the last. Hydrogen, a non-metal is included because the reactions involving metals and acids are common and important.

Rb(most active)

K

Na

Ca

Mg

Al

Mn

Zn

Cr

Fe

Ni

Sn

Pb

H

Cu

Bi

Sb

Hg

Ag

Pt

Au(least active)

slide5

THE EXPERIMENT....

Materials :

Beaker

Graduated Cylinder

Safety goggles

Test tubes

Test tube rack

Reagents:

BaCl2

CuSO4

ZnSO4

HCl

NH4OH

slide6

Procedure:

A.

1. Place 3mL of CuSO4 solution in a test tube. Take note of its color.

2. Add 1mL of NH4OH solution to the CuSO4 solution. Observe and record what happens.

B.

1. Place 5mL HCl in each of four test tubes.

2. Add the metals separately to the test tubes. Label each test tube.

3. observe what happens in each tube. Record any change in color or appearance of the metal pieces. Record observations on the data chart.

C.

1. Place 3mL of ZnSO4 in a test tube. Add 1mL of BaCl2 to it. Describe and Record what happens.

slide7

DATA and ANALYSIS

CuSO4 + 2NH4OH (NH4)2SO4 + Cu(OH)2

(blue (colorless (dark blue

Solution) Solution) solution)

B. A more reactive element replaces a less active element from its compound.

2HCl + Fe FeCl2 + H2

(rust/black effervescence

substance)

slide8

HCl + Cu No reaction. Cu is less active than H.

2HCl + Mg MgCl2 + H2

(dissolved effervescence

completely)

6HCl + 2Al 2AlCl3 + H2

(white effervescence

precipitate)

slide9

C.

ZnSO4 + BaCl2 ZnCl2 + BaSO4

(white

precipitate)

slide10

Questions :

What observed change indicates chemical reactivity in A?

There’s a change in color.

Which of the substance used in B showed changes?

Fe - iron

A reaction occurs when a more active element replaces a less active element in the solution. Which element was most active in B? Which was the least active?

Mg- Most active

Cu – Least active

slide11

What kind of change was shown in procedure B?

Chemical and Physical Change

What other pieces of evidence will show occurrence of chemical reactions?

The rusting of metals,

slide12

Zn + 2 HCl → ZnCl2 + H2

  • Zn + 2 HCl → ZnCl2 + H2

Here are some examples of chemical reactions you may have seen before: 

Rusty Nails: A chemical reaction between the iron in steel and oxygen in the atmosphere causes rust. 

Photographic film: There is a chemical reaction on the film wherever light hits it. 

Batteries: Chemical reactions within batteries produce electrons called electrochemical reactions. 

slide13

Halloween Lightsticks: A chemical reaction excites atoms causing the stick to glow. 

Homemade Volcano: When baking soda and vinegar are combined, they erupt as carbon dioxide gas is released. (If you try this, be prepared to clean up afterward!) 

Fizz Fizz: Dropping an Alka-Seltzer tablet in water makes a bubbling chemical reaction. 

An Old Fruit Salad: Cut a piece of fruit open and it soon turns brown, reacting to the oxygen in the air.

slide14

Photographic Film

Rusting of Nails

slide16

THE END

THANK YOU! 

Source :

www.google.com

http://www.windows2universe.org/earth/geology/chem_reactions.html

slide17

Presented By:

Group 6 1-AAPD1I

Ian Mariano

Tjhay Ordonez

Louise Oliveros

KristelleOrdinanza

Regina Ortiz