Podcast
Questions and Answers
In a chemical equation, what information is conveyed by the reactants and products?
In a chemical equation, what information is conveyed by the reactants and products?
- The formulas and quantities of the substances involved in the reaction. (correct)
- Only the physical states of the substances.
- Only the formulas of the substances involved.
- Only the types of atoms involved in the reaction.
What does the symbol '(g)' indicate in a chemical equation?
What does the symbol '(g)' indicate in a chemical equation?
- Aqueous solution
- Solid state
- Gaseous state (correct)
- Liquid state
Which statement correctly describes the arrangement of reactants and products in a chemical equation?
Which statement correctly describes the arrangement of reactants and products in a chemical equation?
- Reactants are above the arrow, products below.
- Reactants are on the right side, products on the left.
- Reactants are on the left side, products on the right. (correct)
- Reactants and products are randomly placed.
In the context of writing chemical equations, what does a double arrow ($\rightleftharpoons$) signify?
In the context of writing chemical equations, what does a double arrow ($\rightleftharpoons$) signify?
According to the Law of Conservation of Mass, what must be true of a balanced chemical equation?
According to the Law of Conservation of Mass, what must be true of a balanced chemical equation?
Which type of chemical reaction is represented by the general equation $A + B \rightarrow AB$?
Which type of chemical reaction is represented by the general equation $A + B \rightarrow AB$?
What type of chemical reaction is generally the opposite of combination reaction?
What type of chemical reaction is generally the opposite of combination reaction?
In a single-replacement reaction, what determines whether one element will replace another in a compound?
In a single-replacement reaction, what determines whether one element will replace another in a compound?
What is the defining characteristic of a double-replacement reaction?
What is the defining characteristic of a double-replacement reaction?
What must be equal on both sides of a balanced chemical equation?
What must be equal on both sides of a balanced chemical equation?
What type of reaction is the following: $S_8 + 12O_2 \rightarrow 8SO_3$?
What type of reaction is the following: $S_8 + 12O_2 \rightarrow 8SO_3$?
Determine the type of reaction: $4KClO_3 \rightarrow 2KCl + 3O_2$?
Determine the type of reaction: $4KClO_3 \rightarrow 2KCl + 3O_2$?
Identify the type of reaction below: $N_2 + 3H_2 \rightarrow 2NH_3$
Identify the type of reaction below: $N_2 + 3H_2 \rightarrow 2NH_3$
What type of reaction is represented as: $WX + YZ \rightarrow WZ + XY$?
What type of reaction is represented as: $WX + YZ \rightarrow WZ + XY$?
What type of reaction is described by this equation: $2H_2 + O_2 \rightarrow 2H_2O$?
What type of reaction is described by this equation: $2H_2 + O_2 \rightarrow 2H_2O$?
Identify the reaction type indicated by $Fe_3O_4 + 4H_2 \rightarrow 3Fe + 4H_2O$?
Identify the reaction type indicated by $Fe_3O_4 + 4H_2 \rightarrow 3Fe + 4H_2O$?
What type of reaction is illustrated by this equation: $C + H_2O \rightarrow CO + H_2$?
What type of reaction is illustrated by this equation: $C + H_2O \rightarrow CO + H_2$?
Which reaction type does the following equation represent: $SiC + 2Cl_2 \rightarrow SiCl_4 + C$?
Which reaction type does the following equation represent: $SiC + 2Cl_2 \rightarrow SiCl_4 + C$?
Identify the reaction: $Xe + 3F_2 \rightarrow XeF_6$
Identify the reaction: $Xe + 3F_2 \rightarrow XeF_6$
Determine the type of reaction illustrated in the equation: $2Na + Cl_2 \rightarrow 2NaCl$?
Determine the type of reaction illustrated in the equation: $2Na + Cl_2 \rightarrow 2NaCl$?
In the single replacement reaction $AB + C \rightarrow CB + A$, what is the role of element C?
In the single replacement reaction $AB + C \rightarrow CB + A$, what is the role of element C?
What does the activity series of metals indicate?
What does the activity series of metals indicate?
In a double-replacement reaction, what drives the reaction to completion?
In a double-replacement reaction, what drives the reaction to completion?
What is the first primary step in balancing a chemical equation?
What is the first primary step in balancing a chemical equation?
What is the second key step in balancing chemical equations?
What is the second key step in balancing chemical equations?
What is the final step in balancing a chemical equation?
What is the final step in balancing a chemical equation?
Which strategy is best applied when balancing chemical equations?
Which strategy is best applied when balancing chemical equations?
What is the key parameter that must be conserved on both sides of a balanced chemical equation?
What is the key parameter that must be conserved on both sides of a balanced chemical equation?
If the number of oxygen atoms is uneven across an equation, what action might you take?
If the number of oxygen atoms is uneven across an equation, what action might you take?
What is a 'diatomic molecule' as it applies to writing chemical equations?
What is a 'diatomic molecule' as it applies to writing chemical equations?
Why is it important to balance chemical equations according to the Law of Conservation of Mass?
Why is it important to balance chemical equations according to the Law of Conservation of Mass?
Which of the following equation correctly represents a decomposition reaction?
Which of the following equation correctly represents a decomposition reaction?
Which of the following equation correctly represents a combination reaction?
Which of the following equation correctly represents a combination reaction?
Which of the following equation correctly represents a single-replacement reaction?
Which of the following equation correctly represents a single-replacement reaction?
In the unbalanced equation $Al(s) + CuCl_2(aq) \rightarrow AlCl_3(aq) + Cu(s)$, which coefficients are necessary to balance the equation?
In the unbalanced equation $Al(s) + CuCl_2(aq) \rightarrow AlCl_3(aq) + Cu(s)$, which coefficients are necessary to balance the equation?
In the unbalanced equation $Na_3PO_4 + MgCl_2 \rightarrow NaCl + Mg_3(PO_4)_2$, which coefficients are necessary to balance the equation?
In the unbalanced equation $Na_3PO_4 + MgCl_2 \rightarrow NaCl + Mg_3(PO_4)_2$, which coefficients are necessary to balance the equation?
In the unbalanced equation $C_4H_{10} + O_2 \rightarrow CO_2 + H_2O$, which coefficients are necessary to balance the equation?
In the unbalanced equation $C_4H_{10} + O_2 \rightarrow CO_2 + H_2O$, which coefficients are necessary to balance the equation?
In the unbalanced equation $Al + HCl \rightarrow AlCl_3 + H_2$, which coefficients are necessary to balance the equation?
In the unbalanced equation $Al + HCl \rightarrow AlCl_3 + H_2$, which coefficients are necessary to balance the equation?
Flashcards
Chemical Equation
Chemical Equation
Illustrates the formulas and quantities of reactants and products involved in a chemical reaction.
Reactants
Reactants
Substances that enter into a chemical reaction.
Products
Products
Substances formed as a result of a chemical reaction.
Diatomic molecules
Diatomic molecules
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Left Side of Equation
Left Side of Equation
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Right Side of Equation
Right Side of Equation
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Forward Arrow (→)
Forward Arrow (→)
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Equilibrium Arrows (⇌)
Equilibrium Arrows (⇌)
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Law of Conservation of Mass
Law of Conservation of Mass
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Chemical Reaction
Chemical Reaction
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Combination Reaction
Combination Reaction
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Decomposition Reaction
Decomposition Reaction
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Single-Replacement Reaction
Single-Replacement Reaction
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Double-Replacement Reaction
Double-Replacement Reaction
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Activity Series
Activity Series
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Balancing Chemical Equations
Balancing Chemical Equations
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Steps to Balancing Equations
Steps to Balancing Equations
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Study Notes
Chemical Reactions and Equations
- Chemical reactions and equations with Robin Angelo DS. Angeles, LPT
Objectives
- Write balanced chemical equations
- Classify chemical equations by reaction types
- Apply the principle of conservation of mass to chemical reactions
Contents
- Writing chemical equations
- Types of chemical reactions
- Balancing chemical equations
Chemical Equations
- Formulas and quantities of reactants and products are shown in a chemical equation
- All chemical equations show reactants that enter the reaction
- All chemical equations show the products that are formed in the reaction
- All chemical equations show the number of moles of each substance used and each substance produced
2H2(g) + O2(g) → 2H2O
Equation Notes
- A small letter after each substance indicates its physical state:
- (s) indicates solid
- (l) indicates liquid
- (g) indicates gas
- (aq) indicates an aqueous solution
Important Equation Notes
- Elements that exist as diatomic molecules are written as follows: H2, N2, O2, F2, Cl2, Br2, I2
- Reactants are written on the left
- Products are placed on the right
- An arrow "→" means "yields" and shows results of the reaction
- An reaction is reversible if it has "⇌"
- An alternative for solid is show if there is precipitate
Law of Conservation of Mass
- The number of atoms of each element in the reactant must be equal to the number of atoms of each in the product
Chemical Reaction
- A process where a particular substance undergoes change into one or more new substances
Types of Chemical Reactions
- Combination reaction
- Decomposition reaction
- Single-replacement reaction
- Double-replacement reaction
Library Activity
- Research combination, decomposition, single-replacement, and double-replacement reactions
- Provide at least three examples for each type of reaction
- Prepare a one page summary and prepare for recitation
- Cite references using APA style
Combination Reaction
- Also known as synthesis or addition reaction
- Involves two or more substances combining to form a single, more complex substance
A + B → AB2H2(g) + O2(g) → 2H2O (l)CO2(aq) + H2O(l) → H2CO3(aq)
Decomposition Reaction
- It is the opposite of combination reaction
- Compounds breakdown, and decompose into two or more components
AB → A + B2H2O (l) → 2H2 + O22KMnO4 (s) → K2MnO4(s) + MnO2(g) + O2(g)
Single-Replacement Reaction
- Also known as substitution reaction
- A more active element replaces a less active element in a compound
AB + C → CB + AFe(s) + CuSO4(aq) → FeSO4(aq) + Cu (s)Cl2(g) + 2KI (aq) → I2(s) + 2KCl (aq)
Activity Series
Double-Replacement Reaction
- Also known as ionic reaction
- Characterized by the exchange of ions held by covalent bonds
- General form:
AB + CD → AD + CBHCl (aq) + NaOH (aq) → NaCl(aq) + H2O (l)Na2CO3(aq) + 2HCl (aq) → 2NaCl(aq) + 2H2O (l) + CO2(g)
Reaction Identification
- Analyze chemical equations and identify the type of reaction
Equation Examples
- S8 + 12O2 -> 8SO3
- 4KClO3 -> 2KCl + 3O2
- N2 + 3H2 -> 2NH3
- WX + YZ -> WZ + XY
- 2H2 + O2 -> 2H2O
- Fe3O4 + 4H2 -> 3Fe + 4H2O
- C + H2O -> CO + H2
- SiC + 2Cl2 -> SiCl4 + C
- Xe + 3F2 -> XeF6
- 2Na + Cl2 -> 2NaCl
Balancing Chemical Equations
- Balancing chemical equations with the conservation of mass
Balancing Steps
- Analyze and identify reactants and products
- Count the atoms of each element on each side of the equation
- Start balancing the equation using the trial-and-error method
- Check the balanced equation to ensure an equal number of each atom is on both sides
Balancing Example
- Example using KClO3 → KCl + O2:
- Reactant side: 1 K, 1 Cl, 3 O
- Product side: 1 K, 1 Cl, 2 O
- Balance equation: 2KClO3 → 2KCl + 3O2
Sample Problems
- Balancing Equations:
- Fe (s) + O2(g) → Fe2O3(s)
- Al(s) + CuCl2(aq) → AlCl3(aq) + Cu(s)
- Al + HCl → AlCl3 + H2
- Na3PO4 + MgCl2 → NaCl + Mg3(PO4)2
- C4H10 + O2 → CO2 + H2O
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