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Questions and Answers
Which of the following is the primary characteristic of a physical process?
Which of the following is the primary characteristic of a physical process?
- Formation of chemical bonds
- Breaking of chemical bonds
- Changes in intermolecular interactions (correct)
- Transformation into new substances
Phase changes, such as melting or boiling, are examples of chemical processes.
Phase changes, such as melting or boiling, are examples of chemical processes.
False (B)
What type of process involves the breaking and/or formation of chemical bonds?
What type of process involves the breaking and/or formation of chemical bonds?
chemical process
Dissolving a salt in water is considered a 'grey area' between physical and chemical processes because it involves breaking ______ bonds and creating ion-dipole interactions.
Dissolving a salt in water is considered a 'grey area' between physical and chemical processes because it involves breaking ______ bonds and creating ion-dipole interactions.
Match the following processes with their type (Physical or Chemical):
Match the following processes with their type (Physical or Chemical):
Which observation typically indicates that a chemical change has occurred?
Which observation typically indicates that a chemical change has occurred?
In a chemical reaction, the number of atoms of each element remains the same from reactants to products.
In a chemical reaction, the number of atoms of each element remains the same from reactants to products.
What is the chemical formula for methane gas when it's burned in the presence of oxygen gas to produce carbon dioxide and water?
What is the chemical formula for methane gas when it's burned in the presence of oxygen gas to produce carbon dioxide and water?
In a balanced chemical equation, the number of atoms of each element must be the ______ on both sides of the equation.
In a balanced chemical equation, the number of atoms of each element must be the ______ on both sides of the equation.
Match the type of equation to its use case.
Match the type of equation to its use case.
Which of the following best describes a net ionic equation?
Which of the following best describes a net ionic equation?
Spectator ions are included in the net ionic equation.
Spectator ions are included in the net ionic equation.
What is the purpose of writing a net ionic equation instead of a complete ionic equation?
What is the purpose of writing a net ionic equation instead of a complete ionic equation?
Ions that are present in the reaction mixture but do not participate in the reaction are called ______ ions.
Ions that are present in the reaction mixture but do not participate in the reaction are called ______ ions.
Match each equation type with its description.
Match each equation type with its description.
Which type of equation is most useful when needing to identify all of the species in a system (reacting species and spectator ions)?
Which type of equation is most useful when needing to identify all of the species in a system (reacting species and spectator ions)?
The complete ionic equation normally used when dealing with a problem that only involves the precipitation reaction
The complete ionic equation normally used when dealing with a problem that only involves the precipitation reaction
Write the balanced molecular equation for the reaction when Methane gas, $CH_4$, is burned in the presence of oxygen gas to produce carbon dioxide and water.
Write the balanced molecular equation for the reaction when Methane gas, $CH_4$, is burned in the presence of oxygen gas to produce carbon dioxide and water.
When balancing chemical equations, we use ______ to ensure that the number of atoms for each element is the same on both sides of the equation.
When balancing chemical equations, we use ______ to ensure that the number of atoms for each element is the same on both sides of the equation.
Match the following ions with their role in a precipitation reaction between barium nitrate and sodium sulfate:
Match the following ions with their role in a precipitation reaction between barium nitrate and sodium sulfate:
Flashcards
Physical Processes
Physical Processes
Changes in intermolecular interactions that alter properties without changing composition. Examples include phase changes and forming solutions.
Chemical Processes
Chemical Processes
Changes involving the breaking and/or formation of chemical bonds, transforming substances into new ones with different properties.
Phase Change
Phase Change
A physical process where changes in intermolecular interactions result in changes in properties, but the composition remains the same.
Making a Solution
Making a Solution
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Chemical Processes
Chemical Processes
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Net Ionic Equation
Net Ionic Equation
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Complete Ionic Equation
Complete Ionic Equation
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Study Notes
- Chemical reactions
Chemical vs. Physical Processes
- Physical processes involve changes in intermolecular interactions.
- In physical processes, properties change but the composition of the substance remains the same.
- Phase changes and the formation or separation of mixtures are examples of physical processes.
- Chemical processes involve the breaking and/or formation of chemical bonds.
- Dissolving a salt in water involves breaking ionic bonds and creating ion-dipole interactions.
Physical Processes
- Phase change: Changes in intermolecular interactions result in changes in properties, but the composition remains the same.
- Making a solution: Changes in intermolecular interactions result in changes in properties, but the composition remains the same.
Chemical Processes
- Involve the breaking and/or formation of chemical bonds.
- Substances are transformed into new substances with new properties.
- Temperature changes, production of light, formation of a gas or precipitate, and/or changes in color indicates a chemical change.
- Soft metal Na(s) + Gas Cl2(g) -> Table Salt 2NaCl(s)
Chemical and Physical Processes
- Dissolving a salt in water involves breaking ionic bonds and forming ion-dipole interactions.
- NaCl(s) -> Na+(aq) + Cl-(aq)
Conservation of Atoms in Chemical Reactions
- Atoms are conserved in chemical reactions
- CH4 + 2O2 -> CO2 + 2H2O
Balancing Chemical Equations
- A pure sample of carbon is burned in excess oxygen gas to form carbon monoxide, atoms, and mass are conserved in this chemical reaction
- 2C(s) + O2(g) -> 2CO(g)
- Methane gas, CH4 is burned in the presence of oxygen gas to produce carbon dioxide and water
- CH4(g) + 2O2(g) -> CO2(g) + 2H2O(g)
- Net ionic equation for the reaction when an aqueous solution of barium nitrate is added to an aqueous solution of sodium sulfate and a barium sulfate precipitate forms.
- Ba2+(aq) + SO42-(aq) -> BaSO4(s)
Balancing Chemical Equations
- Complete ionic equation for the reaction that takes place when an aqueous solution of barium nitrate is added to an aqueous solution of sodium sulfate and a barium sulfate precipitate forms.
- Ba(NO3)2(aq) + Na2SO4(aq) -> BaSO4(s) + 2NaNO3(aq)
Net Ionic vs. Complete Ionic Equations
- Net Ionic Equation only shows the reaction that actually took place
- Ba2+(aq) + SO42-(aq) -> BaSO4(s)
- Normally used when dealing with a problem that only involves the precipitation reaction
- Complete Ionic Equation shows all of the species that are present
- Ba(NO3)2(aq) + Na2SO4(aq) -> 2 NaNO3(aq) + BaSO4(s)
- Normally used when it is necessary to identify all of the species in a system (reacting species and spectator ions)
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