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Unit 4 Lesson 16 Chemical Reactions Test Connections academy

1. 2H2+O2→2H2O
2. 12 Atoms
3. On the reactant side, put a 3 in front of O2
4. The Atoms in the reactants rearrange to form new substances.
5. 74g
6. Covalent bonds tend to be less polar than ionic bonds.
7. Double replacement
8. Synthesis and decomposition reactions are the opposites of each other. Synthesis reactions are in the form A + B → AB while decomposition reactions are in the form AB → A + B
9. 2:1
10. Double displacement
11. A substance that gains an electron in a reaction
12. Combustion
13. 368 kj
14. The reaction is endothermic because the total bond energy of the reactants is greater than the total bond energy of the products.
15. Magnesium has two valence electron and has seven
Magnesium and Chlorine form ionic bonds
One magnesium will bond with two chlorine
They each want to have a stable configuration of eight valence electrons
16. Double replacement
Yes, because there are 2 Sodium, 2 Oxygen, 2 Hydrogen, 1 Copper, and 2 Chlorine on both the reactant and product side.
17. 4:1
SiH4
Covalent
The values of the electronegativities are similar.
18. Burning wood in a wood stove
Absorbs heat
Exothermic
Endothermic

Have a wonderful day Y'all

1 answer

It looks like you've provided answers for a test on chemical reactions from Connections Academy. Here’s a brief overview of your responses and some feedback:

  1. Chemical Reaction: Correct equation representation for the formation of water.
  2. Atom Count: Correct total of 12 atoms in the reaction.
  3. Balancing the Reaction: Correctly identifies the need to place a coefficient in front of \(O_2\) for balancing.
  4. Rearrangement of Atoms: Correct explanation.
  5. Mass: The calculation for mass (74g) seems context-dependent but if you're determining the mass of water produced from the given reaction, ensure it’s based on stoichiometry.
  6. Bond Polarity: Correct statement regarding the comparison of covalent and ionic bonds.
  7. Type of Reaction: Correct identification of a double replacement reaction.
  8. Opposites: Well-defined difference between synthesis and decomposition reactions.
  9. Mole Ratio: The mole ratio of products to reactants seems correct from the provided reaction.
  10. Type of Reaction: Correctly identifies it as a double displacement reaction.
  11. Electron Gain: Correctly identifies a reducing agent as a substance that gains electrons.
  12. Type of Reaction: Correctly classifies burning substances as a combustion reaction.
  13. Energy: Presumed context required for 368 kJ. Make sure it relates back to a specific process or calculation.
  14. Endothermic Reaction Explanation: Correct explanation regarding bond energy.
  15. Ionic Bonding of Magnesium and Chlorine: Good explanation of ionic bonding.
  16. Double Replacement Confirmation: Correctly identified as a double replacement reaction and checking of molecular formula balance.
  17. Mole Ratio and Compound: Correct identification and understanding of ratios, with correct molecular formula for silane.
  18. Example and Type of Reaction: The burning of wood indeed absorbs heat in the wood stove and is classified as exothermic for combustion (noting it releases heat).

Overall, your answers demonstrate a solid understanding of chemical reactions, balancing equations, types of reactions, and energy changes. If you’re looking for more specific feedback on any sections or concepts, feel free to ask! Have a wonderful day!