7-1 WG Part 4 CB Rnxs w/ Notes

Multiple Choice

What are the two REACTANTS of a Combustion reaction?

• Oxygen and Carbon Dioxide

• A Fuel and Oxygen

• Carbon Dioxide and Water Vapor

• A Fuel and Carbon Dioxide

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You just saw ​

​​ examples of fuels that are often involved in Combustion reactions. Which two elements did they ALL contain? ​​

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This is another name for a compound that contains both hydrogen and carbon atoms and is used as a "fuel" in combustion reactions.

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Once the hydrocarbon breaks apart, the Carbon & Hydrogen atoms combine with ​​

atoms to make two new products which often go unnoticed because they are BOTH colorless ​

​

Multiple Choice

What are the PRODUCT(S) of a combustion reaction

(assume there is plenty of oxygen available)?

• Carbon Dioxide

• Carbon & Oxygen

• Carbon Dioxide & Water Vapor

• Liquid water

• Hydrogen & Carbon

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According to the graph, the Reactants release​

units of energy.

The Products store ​

units of energy which is ​

than what was released by the reactants.

The ​

of energy that was not trapped in the bonds of the products is​

the surroundings.

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We use Combustion Reactions to power our cars, heat our homes, and cook our food because Combustion Reactions are ​ ​

Reactions which means they ​

​ the surroundings and make the surroundings feel​

Multiple Choice

The flame will only be visible

• while atoms are rearranging.

• as long as the candle is hot

• if all of the oxygen has been turned into CO₂ and H₂O

• as long as wax is present

Multiple Choice

Which of the following are sources of energy that can be used to initiate (start) a combustion reaction?

• All of the above

Multiple Choice

The initial input of energy is used to start the reaction by:

• rearranging atoms into new products

• breaking bonds and separating atoms in the fuel and nearby oxygen

• storing some energy in the bonds of the new products

• creating new oxygen atoms

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Once the atoms in the fuel and oxygen separate from each other, they begin to rearrange into new products.

The Carbon that was originally in the fuel bonds to oxygen and forms ​

The Hydrogen that was originally in the fuel bonds to oxygen and forms ​

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SOME of the energy that was released from the reactants gets trapped and stored in the​

of the new products. The energy that is not stored by the products is​

the surroundings and can be used to break bonds of MORE fuel and oxygen molecules, which keeps the reaction going.

Multiple Choice

The "Fire Triangle" includes the three requirements for a fire to continue to burn. Which component will be removed when the person lowers the "candle snuffer" down over the flame?

• Fuel in the form of candle wax

• Heat

• Oxygen

• None of the above

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According to the balanced equation, 1 molecule of METHANE (CH₄) contains enough CARBON atoms to build ​​

of Carbon Dioxide and enough HYDROGEN atoms to build ​​

molecules of Water Vapor.

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According to the balanced equation, 1 molecule of ETHANOL (C₂H₅OH) contains enough CARBON atoms to build ​​

of Carbon Dioxide and enough HYDROGEN atoms to build ​​

molecules of Water Vapor.

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According to the balanced equation, 1 molecule of PROPANE (C₃H₈) contains enough CARBON atoms to build ​​

of Carbon Dioxide and enough HYDROGEN atoms to build ​​

molecules of Water Vapor.

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A "COMPLETE" combustion reaction occurs when there are enough

present for ALL of the atoms in the fuel to bond with and become CO₂ and H₂O molecules.

A ​

flame is a clue that the only products are two gases - CO₂ and H₂O.

Since black soot and smoke​

, the fuel is said to "burn cleanly".

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As the quantity of available Oxygen atoms surrounding the fuel decreases, the carbon atoms become less likely to bond to TWO oxygen atoms.

Instead, a Carbon atom may bond with only 1 Oxygen atom and form a molecule of "Carbon ​​ ​

".

OR it may not bond with ANY oxygen atoms and remain single atoms of Carbon which we recognize as "smoke" or black​

.

Multiple Choice

This glass slide is turning black because:

• Carbon Monoxide molecules are collecting on it.

• Carbon Dioxide molecules are collecting on it.

• Individual Carbon atoms (soot) is collecting on it.

• A hydrocarbon is collecting on it.

Multiple Choice

The black smoke is a sign that there is:

• PLENTY of oxygen atoms available for the fuel to react with

• NOT ENOUGH oxygen atoms available for the fuel to react with

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A flame appears bright yellow/orange when the individual, unbonded carbon atoms (soot) GLOW brightly when they are​

Labeling

Label the Orange and Black Smoke with information about its temperature and composition.

Drag labels to their correct position on the image

VERY HOT Single C atoms

COOLER Single C atoms

Categorize

Options (14)

Abundance (plenty) of Oxygen around

Blue Flame

Products are CO₂ and H₂O

NOT enough Oxygen present

Some Carbon atoms can't form CO₂ due to lack of Oxygen

Yellow/Orange Flame

Smoke and Soot present

Clean - No smoke or soot

"Dirty Flame"

Carbon Monoxide is formed

Products are two colorless, clean gases

Consider the differences between COMPLETE and INCOMPLETE Combustion reactions and move the tiles under the correct header.

COMPLETE COMBUSTION

INCOMPLETE COMBUSTION

Multiple Select

Select ALL images that indicate there is an abundance of oxygen surrounding the fuel.

Multiple Select

Select ALL images that indicate an INCOMPLETE COMBUSTION reaction is happening.

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Carbon monoxide molecules bind to ​

PREVENTING them from binding to oxygen molecules. This​

the amount of oxygen that is transported to the cells in the body.

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The hemoglobin in red blood cells tend to bind more tightly to ​

​ molecules than to ​​

molecules.

The more CO in a person's blood, the ​

​ oxygen will be transported to the cells throughout the body.

Multiple Choice

The VERY FIRST thing you should do if your Carbon Monoxide alarm starts beeping is:

• call 911 from inside the house

• search for the source of the CO leak

• try to reset the CO alarm and see if it beeps again

• move outside into fresh air

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The FIRST tip on this infographic is to ONLY use your grill OUTSIDE. This is because there isn't enough​

in the enclosed space and​

combustion will occur. This will produce​

which can unknowingly build up in the enclosed area.

Multiple Choice

This is a problem because:

• The car will take longer than usual to warm up.

• Carbon monoxide could back up inside the car.

• The water vapor produced during the combustion reaction will freeze instantly.

• Gasoline is wasted.