Chemical Reactions Test Period 1

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Chemical Reactions Test Period 1 - Quiz

Chemical Reactions


Questions and Answers
  • 1. 

    When bonds break and rearrange to form new chemicals it is called a......

    • A.

      Physical Change

    • B.

      Law of Proportions

    • C.

      Chemical Reaction

    • D.

      Chemical Property

    Correct Answer
    C. Chemical Reaction
    Explanation
    A chemical reaction occurs when bonds between atoms are broken and rearranged to form new chemicals. This process involves a change in the chemical composition of the substances involved, resulting in the formation of different molecules or compounds. Unlike a physical change, which only affects the physical properties of a substance (such as its shape or state), a chemical reaction involves a transformation at the molecular level. Therefore, the correct answer is Chemical Reaction.

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  • 2. 

    What is the difference between a physical change and a chemical reaction?

    • A.

      In a chemical recation new atoms are formed

    • B.

      In a chemical change bonds are broken and atoms are rearranged

    • C.

      In a physical change atoms are lost

    • D.

      In a physical change bonds are broken but in a chemical reaction they are not broken

    Correct Answer
    B. In a chemical change bonds are broken and atoms are rearranged
    Explanation
    In a chemical change, bonds between atoms are broken and new bonds are formed, resulting in the rearrangement of atoms to form new substances. This is different from a physical change where the arrangement of atoms remains the same and no new substances are formed. The statement correctly explains that in a chemical change, bonds are broken and atoms are rearranged, highlighting the key difference between a physical change and a chemical reaction.

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  • 3. 

    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___H2 + ___O2 => ___H2O

    Correct Answer
    2,1,2
  • 4. 

    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___C3H8 + ___O2 => ___CO2 + ___H2O

    Correct Answer
    1,5,3,4
    Explanation
    C 3 C 1,3
    H 8 H 8
    O 2,10 O 10

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  • 5. 

    Type in the coefecients separated by a comma and include the coeffecient "1".  for example  1,2,5,2,1 would be the answer for  Al + 2N2 + 5O2 => 2N2O5 + AlBalance this chemical reaction ___Al(OH)3 + ___H2SO4 => ___Al2(SO4)3 + ___H2O

    Correct Answer
    2,3,1,6
    Explanation
    Al 1,2 Al 2
    O 7,10,18 O 13,16,18
    H 8,12 H 2,8,12
    S 1,3 S 3

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  • 6. 

    Why do chemist need to work with balanced equations?

    • A.

      Because of the law of conservation of energy

    • B.

      Because they just want to

    • C.

      Because of the law of conservation of mass

    • D.

      Because they need to get fast reaction rates

    Correct Answer
    C. Because of the law of conservation of mass
    Explanation
    Chemists need to work with balanced equations because of the law of conservation of mass. This law states that matter cannot be created or destroyed in a chemical reaction, only rearranged. Balanced equations ensure that the number of atoms of each element on both sides of the equation is the same, thus demonstrating the conservation of mass. By working with balanced equations, chemists can accurately calculate the amounts of reactants and products involved in a reaction and predict the outcome of chemical reactions.

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  • 7. 

    The heaters in Army MRE's use a heater that give of heat when water is added.  This makes the food hot and scrumptious!!  What type of reaction is involved? 

    • A.

      Endothermic

    • B.

      Exothermic

    Correct Answer
    B. Exothermic
    Explanation
    The given correct answer is "exothermic." This means that the reaction releases heat energy into its surroundings. In the case of the heaters in Army MRE's, when water is added to the heater, a chemical reaction occurs that produces heat. This heat is then transferred to the food, making it hot and delicious.

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  • 8. 

    At the 20 second mark of this experiment a magical reaction happens....what type is it?

    • A.

      Endothermic

    • B.

      Exothermic

    Correct Answer
    A. Endothermic
    Explanation
    At the 20-second mark of the experiment, a magical reaction occurs. Based on the given options, the correct answer is "endothermic." This means that the reaction absorbs heat from its surroundings. In an endothermic reaction, the energy of the products is higher than the energy of the reactants, resulting in a decrease in temperature. Therefore, at the 20-second mark, the reaction is likely absorbing heat, indicating an endothermic process.

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  • 9. 

    What type of reaction is this? C10H22 + O2 => CO2 + H2O

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    C. Combustion
    Explanation
    The given chemical equation represents the combustion of C10H22 (a hydrocarbon) with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). Combustion reactions involve the rapid combination of a fuel (in this case, C10H22) with oxygen, resulting in the release of energy in the form of heat and light. Therefore, the correct answer is combustion.

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  • 10. 

    What type of reaction is this? KOH + HBr => KBr + H2O

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    E. Double Replacement
    Explanation
    This reaction is a double replacement reaction because the cations (K+ and H+) and the anions (OH- and Br-) in the reactants switch places to form new compounds (KBr and H2O) in the products.

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  • 11. 

    What type of reaction is this? N2 + H2 => NH3

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    A. Synthesis
    Explanation
    The given reaction is a synthesis reaction because it involves the combination of two reactants (N2 and H2) to form a single product (NH3). In a synthesis reaction, two or more substances combine to form a more complex substance.

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  • 12. 

    What type of reaction is this? Al(OH)3 + HBr => AlBr3 + H2O

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    E. Double Replacement
    Explanation
    This reaction is a double replacement reaction because the cations and anions in the reactants switch places to form new compounds. In this case, the aluminum hydroxide (Al(OH)3) reacts with hydrogen bromide (HBr) to form aluminum bromide (AlBr3) and water (H2O).

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  • 13. 

    What type of reaction is this? Li + H2O => LiOH + H2

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    D. Single Replacement
    Explanation
    In this reaction, lithium (Li) replaces hydrogen (H) in water (H2O) to form lithium hydroxide (LiOH) and hydrogen gas (H2). This is a single replacement reaction because one element (Li) replaces another element (H) in a compound (H2O).

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  • 14. 

    What type of reaction is this?

    • A.

      Synthesis

    • B.

      Decomposition

    • C.

      Combustion

    • D.

      Single Replacement

    • E.

      Double Replacement

    Correct Answer
    B. Decomposition
    Explanation
    This is a decomposition because the image shows a larger substance being broken down into smaller substances

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  • 15. 

    After 400 seconds of this experiment there is less small chips remaining than there is large chips.   This demonstrates _____________ effect on reaction rate

    • A.

      Temperature

    • B.

      Surface Area

    • C.

      Pressure

    • D.

      Using a Catalyst

    Correct Answer
    B. Surface Area
    Explanation
    The answer is surface area because a substance broken down into smaller chips would have a greater surface area making the reaction happen faster

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  • 16. 

    At a higher concentration the recation rate is faster and form a greater amount of ___________ in a shorter period of time

    • A.

      Products

    • B.

      Reagents (this means reactants)

    Correct Answer
    A. Products
    Explanation
    At a higher concentration, the reaction rate is faster because there are more reactant particles present, leading to more frequent collisions between them. This results in a greater amount of products being formed in a shorter period of time.

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  • 17. 

    In order to increase the reaction rate you can increase all of the following EXCEPT.....

    • A.

      Temperature

    • B.

      Concentration

    • C.

      Pressure

    • D.

      Surface Area

    Correct Answer
    C. Pressure
    Explanation
    you must DECREASE the pressure in order to increase the reaction rate. This is because decreasing the pressure will allow for the particles to move faster and contact each other more often

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  • 18. 

    Using what you know about how temperature affects reaction rateswhat is the temperature of the middle beaker?

    • A.

      Colder than the other twobeakers

    • B.

      Hotter than the other two beakers

    Correct Answer
    A. Colder than the other twobeakers
    Explanation
    It is colder than the other two because the reaction is happening at a slower rate

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  • 19. 

    Using knowledge from the lab experiment and what we learned about reaction rates how could you get alka seltzer to dissolve the fastes so you could get the medicine in your body the fastest

    • A.

      Use a whole tablet in cold water

    • B.

      Use a crushed tablet in room temperature water

    • C.

      Use a crushed tablet in warm water

    • D.

      Use a whole tablet in warm water

    Correct Answer
    C. Use a crushed tablet in warm water
    Explanation
    Using a crushed tablet in warm water would result in the fastest dissolution of Alka Seltzer. Crushing the tablet increases the surface area, allowing for more contact between the water and the tablet, which speeds up the dissolution process. Warm water also increases the kinetic energy of the water molecules, causing them to move more quickly and collide with the tablet more frequently. This increased collision rate further enhances the dissolution rate. Therefore, using a crushed tablet in warm water would maximize the rate of dissolution and enable the medicine to enter the body more quickly.

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  • 20. 

    If you put a whole tablet of alka seltzer in the same temperature water at the beach in florida and also on top of a mountain in colorado which one would dissolve first?

    • A.

      Florida

    • B.

      Colorado

    Correct Answer
    B. Colorado
    Explanation
    Colorado because the pressuere would be less

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Feb 10, 2011
    Quiz Created by
    Chip_brand
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