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Which of the following is NOT a factor that influences the rate of a chemical reaction?
Which of the following is NOT a factor that influences the rate of a chemical reaction?
A catalyst is consumed during a chemical reaction.
A catalyst is consumed during a chemical reaction.
False (B)
What does the Law of Conservation of Mass state?
What does the Law of Conservation of Mass state?
The Law of Conservation of Mass states that in chemical reactions, atoms are neither created nor destroyed.
Lavoisier discovered the Law of Conservation of Mass by showing reactions that seemed to gain or lose mass were actually involved in reactions with ______ in the air.
Lavoisier discovered the Law of Conservation of Mass by showing reactions that seemed to gain or lose mass were actually involved in reactions with ______ in the air.
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Match the following terms with their definitions.
Match the following terms with their definitions.
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What are the three pieces of information needed to write a chemical equation?
What are the three pieces of information needed to write a chemical equation?
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A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.
A chemical equation is balanced when the number of atoms of each element is the same on both sides of the equation.
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To determine if a chemical equation is balanced, you need to count the number of _____ of each element on both sides of the equation.
To determine if a chemical equation is balanced, you need to count the number of _____ of each element on both sides of the equation.
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Which of the following is NOT one of the three pieces of information needed to write a chemical equation?
Which of the following is NOT one of the three pieces of information needed to write a chemical equation?
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Describe how you can tell whether a chemical equation is balanced or unbalanced.
Describe how you can tell whether a chemical equation is balanced or unbalanced.
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In an exothermic reaction, more energy is required to break the bonds in the reactants than is released when new bonds are formed.
In an exothermic reaction, more energy is required to break the bonds in the reactants than is released when new bonds are formed.
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In an exothermic reaction, the energy released when new bonds form is _____ than the energy required to break the existing bonds.
In an exothermic reaction, the energy released when new bonds form is _____ than the energy required to break the existing bonds.
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Match the following terms with their correct definitions:
Match the following terms with their correct definitions:
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What is a chemical reaction?
What is a chemical reaction?
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Which of the following is NOT a physical change?
Which of the following is NOT a physical change?
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A chemical change always results in the formation of a new substance.
A chemical change always results in the formation of a new substance.
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The substances that you start with in a chemical reaction are called ______.
The substances that you start with in a chemical reaction are called ______.
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What are products in a chemical reaction?
What are products in a chemical reaction?
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Which of the following is NOT evidence of a chemical reaction?
Which of the following is NOT evidence of a chemical reaction?
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List six types of evidence that can indicate a chemical reaction has taken place.
List six types of evidence that can indicate a chemical reaction has taken place.
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Match the following reaction types with their definitions:
Match the following reaction types with their definitions:
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A decomposition reaction is a type of reaction where two or more reactants combine to form a single product.
A decomposition reaction is a type of reaction where two or more reactants combine to form a single product.
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Give an example of a synthesis reaction.
Give an example of a synthesis reaction.
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A ______ reaction is a type of reaction where one element replaces another element in a compound.
A ______ reaction is a type of reaction where one element replaces another element in a compound.
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Give an example of a decomposition reaction.
Give an example of a decomposition reaction.
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Which of the following factors can affect the rate of a chemical reaction?
Which of the following factors can affect the rate of a chemical reaction?
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Increasing the temperature of a reaction mixture will always decrease the reaction rate.
Increasing the temperature of a reaction mixture will always decrease the reaction rate.
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Explain how increasing the surface area of reactants can affect the rate of a reaction.
Explain how increasing the surface area of reactants can affect the rate of a reaction.
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A [blank} is a substance that speeds up the rate of a reaction without being consumed in the process.
A [blank} is a substance that speeds up the rate of a reaction without being consumed in the process.
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Study Notes
Chemical Reactions
- A chemical reaction is a process where two or more substances interact, causing atoms to rearrange and form new substances with different properties.
- A physical change alters the form of matter, but not its chemical identity. Examples include changes of state (solid, liquid, gas), dissolving, and changing the size or shape of an object.
- A chemical change involves a chemical reaction, producing new substances with different properties. Examples include rusting and burning.
- Reactants are the substances you start with, and products are what you end up with. Bonds break in reactants and atoms rearrange to form new bonds in products.
- Evidence of chemical reactions includes: color change, light emission, formation of gas, and temperature change.
Classifying Reactions
-
Synthesis: Two simple compounds combine to form a more complex compound.
- Example: 2NO + O2 → 2NO2
-
Decomposition: One reactant breaks down into two or more products.
- Example: CH4 + 2O2 → CO2 + 2H2O
-
Combustion: A substance reacts with oxygen, often producing heat and light.
- Example: 2H2O2 → 2H2O + O2
Factors Affecting Reaction Rate
- Temperature: Higher temperatures increase reaction rates, as particles move faster and collide more frequently.
- Catalyst: A substance that speeds up a reaction but is not consumed in the process.
- Surface Area: Increasing surface area exposes more reactants, promoting faster collisions and thus faster reactions.
- Concentration: Higher concentrations increase reaction rates by increasing the number of reactant particles available for collisions.
Law of Conservation of Mass
- The Law of Conservation of Mass states that atoms are neither created nor destroyed in chemical reactions; rather, they are rearranged.
- Lavoisier discovered this law by showing that reactions that appear to gain or lose mass are actually involving interactions with gases in the air.
Writing Chemical Equations
- To write a balanced chemical equation, you need: the reactants, the products, the reactants' and products' chemical formulas/atomic symbols, and the direction of the reaction.
- Chemical equations are balanced when the number of each type of atom is the same on both sides of the equation.
Exothermic vs Endothermic Reactions
- Exothermic reactions release energy (often as heat or light). Less energy is required to break bonds in the reactants compared to the energy released when new bonds form in the products.
- Endothermic reactions absorb energy. More energy is needed to break bonds in the reactants compared to the energy released when new bonds form in the products. Examples include photosynthesis and some phase changes, Examples of Endothermic reactions include some phase changes, like melting ice.
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Description
Explore the fundamentals of chemical reactions, including the differences between chemical and physical changes. Understand how reactants transform into products and the various types of reactions such as synthesis and decomposition. Test your knowledge with this engaging quiz!
