Lesson 6.7 Thermite and single replacement reactions
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Last updated 12 months ago
14 questions
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Be sure to watch the video first. It will help you understand what the article is talking about.
Be sure to watch the video first. It will help you understand what the article is talking about.
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The thermite reaction is an example of a single replacement reaction. In a single replacement reaction, there is always a balancing ion in a compound that switches partners. In the thermite reaction, the balancing ion is oxygen. The negative charge of the oxygen atoms balances the positive charge of the iron ions. After, the reaction the negative charge of the oxygen balances the positive charge of the aluminum atoms. In both the reactant and the product, the compound is electrically neutral. In this reaction, the electrons flow from the aluminum to the iron. The negative ion in the reaction could be any element, since it is only required to make the compound electrical neutral.
Single replacement reactions are fairly easy to predict the product, because the elements appear to switch places in the product. In the thermite reaction, the iron and the aluminum switch so that the aluminum is partnered with the oxygen in the product. The same thing can happen with the halogens as you say in the Halogen Pivot Lab. The only difference is that instead of an element and a positive ion switching places, it is an element and a negative ion.
The table below shows the most common ions for the different elements. Use the table below to help you analyze the following reactions
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Question 2
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Because many transition ion metals make multiple positive ions, a roman numeral is used to tell people the charge of the specific ion. Iron(III) is the name of Fe³⁺. What would would be the name of Fe²⁺ ?
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Most transition metals are found as positive ions because our atmosphere is full of oxygen. Elemental oxygen can steal electrons from almost all metals if given enough time. Therefore metallic ores are compounds of ions. Why is it advantageous to use a chemical reaction to convert a metal ore to a pure metal?
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Do a little research. How is aluminum ore converted into aluminum metal?
What are some uses of the thermite reaction
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How is the thermite reaction different from combustion?
Question 9
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Why shouldn't the thermite reaction be done in the presence of large amounts of water?
Zinc is mixed with silver chloride. What is true about these two reactants
Zn + 2AgCl
only Zn and Cl are ions
Cl is a +1 ion
Cl is a -1 ion
Zn is +1 ion
Only Zn and Ag are ions
Zn is a -1 ion
Ag is a +2 ion
Ag is a -1 ion
Ag is a +1 ion
Zn is a +2 ion
Only Ag and Cl are ions
Zinc is mixed with silver chloride. What is true about the reaction?
Zn + 2AgCl
the electrons flow from Ag to the Zn
the reaction will produce Ag metal
the reaction will produce Zn
the electrons flow from the Cl to the Zn
the electrons flow from the Zn to the Ag
the electrons flow from the Ag to Cl
In the halogen lab, dissolved chlorine gas (Cl₂) was mixed with sodium iodide (NaI). Unlike the reaction between the metals, in this reaction reactants are all nonmetals. What is true about these two reactants
Na is a -1 ion
Cl is a -1 ion
I is a +1 ion
only Na and I are ions
I is a -1 ion
only Na and Cl are ions
Na is a +1 ion
Only Cl and I are ions
Cl is a +1 ion
What is true about the reaction between chlorine gas and sodium iodide (NaI)
electrons flow from the chlorine to the iodine
electrons flow from the iodine to chlorine
electrons flow from the sodium to the iodine
electrons flow from the sodium to the chlorine
one of the products is sodium metal
one of the products is elemental iodine
In the reaction between aluminum metal and copper oxide (CuO), a product will be
oxygen gas
copper metal
a compound composed of aluminum and oxygen ions
a compound composed of aluminum and copper ions
Reduction
giving away an electron
Oxidation
gaining an electron
What is true about this chemical reaction?
the iron is a positive ion in reactants and an element in the products
the aluminum is a positive ion in reactants and an element in the products
the oxygen is a negative ion in reactants and an element in the products
the oxygen is a negative ion in both the products and then reactants
When a metal becomes a positive ion, it is said to be
