Carbon: Transformations in Matter and Energy PowerPoint Presentation, PPT - DocSlides

Carbon: Transformations in Matter and Energy PowerPoint Presentation, PPT - DocSlides

2017-03-27 46K 46 0 0

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Environmental . Literacy Project. Michigan State University. . Systems and Scale . Unit. Activity . 3.4 Molecular Models for Soda Water Fizzing. Unit map. 2. You are here. How Atoms Bond Together in Molecules. ID: 530261

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Presentations text content in Carbon: Transformations in Matter and Energy

Slide1

Carbon: Transformations in Matter and Energy

Environmental

Literacy Project

Michigan State University

Systems and Scale

UnitActivity 3.4 Molecular Models for Soda Water Fizzing

Slide2

Unit map

2

You are here

Slide3

How Atoms Bond Together in Molecules

Atoms in stable molecules always have a certain number of bonds to other atoms:Carbon: 4 bondsOxygen: 2 bondsHydrogen: 1 bondOxygen atoms do NOT bond to other oxygen atoms if they can bond to carbon or hydrogen instead.

3

Slide4

Making the Reactant Molecules: Carbonic Acid

The “fizz” and the taste of soda water come from carbonic acid: H2CO3. Make a molecule of carbonic acid on the reactant side of your Molecular Models Placemat:Get the atoms you will need to make your carbonic acid molecule. Can you figure out from the formula for carbonic acid how many C, H, and O atoms you will need?Use the bonds to make a carbonic acid molecule. Remember the rules for making stable molecules! (Hint: you will need to make one double bond to make a stable molecule.)Compare your molecules to the pictures on the next slide. Are they the same?

4

Slide5

5

Photo of reactant molecule: H

2CO3 (carbonic acid)

Reactants

Products

Chemical change

Slide6

Important:

When you are finished constructing the reactants, put all extra pieces away.

6

Slide7

Rearranging the Atoms to Make Product Molecules: Carbon Dioxide and Water

Soda water loses its “fizz” when carbonic acid (H2CO3) breaks down into carbon dioxide (CO2) and water (H2O). Show how this can happen:Break some of the bonds in your carbonic acid molecule and rearrange the atoms to make two new molecules: CO2 and H2O. Remember the rules for making stable molecules! (Hint: you will need double bonds to make stable molecules of CO2.)Remember, atoms last forever. So you can make and break bonds, but you still need the same atoms.Compare your molecules to the pictures on the next slide. Are they the same?

7

Slide8

8

Photo of product molecules: H

2O (water) CO2 (carbon dioxide)Start by making the molecules and energy units of the reactants and putting them on the reactants side, then rearrange the atoms and energy units to show the products.

Remember: Atoms last forever (so you can rearrange atoms into new molecules, but can’t add or subtract atoms). Energy lasts forever (so you can change forms of energy, but energy units can’t appear or go away)

Reactants

Products

Chemical change

Slide9

9

Comparing photos of reactant and product molecules

Start by making the molecules and energy units of the reactants and putting them on the reactants side, then rearrange the atoms and energy units to show the products.

Remember: Atoms last forever (so you can rearrange atoms into new molecules, but can’t add or subtract atoms). Energy lasts forever (so you can change forms of energy, but energy units can’t appear or go away)

Reactants

Products

Chemical change

Slide10

Reactants

Products

Chemical change

10

What happens

to atoms when carbonic acid decomposes?

Carbonic Acid

Water

Carbon Dioxide

Slide11

Reactants

Products

Chemical change

11

What happens

to carbon atoms when

carbonic acid decomposes

?

Carbonic Acid

Water

Carbon Dioxide

Carbon atoms in

soda water become

part of carbon dioxide molecules.

Slide12

Reactants

Products

Chemical change

12

What happens

to oxygen atoms when

carbonic acid decomposes

?

Carbonic Acid

Water

Carbon Dioxide

Oxygen atoms

in

soda water become

part of

water and carbon dioxide molecules

.

Slide13

Reactants

Products

Chemical change

13

What happens

to hydrogen atoms when

carbonic acid decomposes

?

Carbonic Acid

Water

Carbon Dioxide

Hydrogen atoms

in

soda water become

part of

water molecules

.

Slide14

Reactants

Products

Chemical change

14

What happens

to atoms

when

carbonic acid

decomposes?

Carbonic Acid

Water

Carbon Dioxide

Atoms last forever!

Slide15

Writing a Chemical Equation

Chemists use chemical equations to show how atoms of reactant molecules are rearranged to make product moleculesWriting the equation in symbols: Chemists use an arrow to show how reactants change into products:[reactant molecule formulas] [product molecule formulas]Saying it in words: Chemists read the arrow as “yield” or “yields”:[reactant molecule names] yield [product molecule names]Equations must be balanced: Atoms last forever, so reactant and product molecules must have the same number of each kind of atomTry it: Can you write a balanced chemical equation to show the chemical change when soda water loses its fizz?

15

Slide16

Chemical equation for soda water losing its fizz

H2CO3  H2O + CO2(in words: carbonic acid yields water and carbon dioxide)

16

Slide17


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