5. the baggie began to expand. what would the reaction have to generate to make the bag expand? circle…

5. the baggie began to expand. what would the reaction have to generate to make the bag expand? circle one:\nproduction of a solid production of a gas production of a liquid\n6. figuring out the identity of the gas. leave the bag closed for now!\n a. light a wood splint. quickly open the bag, and put the lit splint just inside the bag, but dont touch the edges to melt the bag. take the splint out and quickly reseal the bag. describe what happened.\n carbon dioxide gas will extinguish a lit splint while oxygen gas will reignite a glowing splint.\n b. write a complete sentence on what gas was in the bag and how you know that was the gas in the bag.\n \n7. rinse the baggie in the sink and hang it over the faucet for the next class.\nquestions:\n1. every chemical reaction must make something ____________. if it doesnt it was just a physical change.\n2. what evidence do you have that a chemical reaction occurred?\n a. b. c.\n3. the reactants for this reaction are: cacl₂ and nahco₃. circle a reaction type.\n double replacement single replacement decomposition synthesis\n4. the products for the reaction are: carbon dioxide, calcium carbonate, sodium chloride and water. give the formula for each compound formed. (hint: look at the chemical reaction below)\n carbon dioxide ____________ sodium chloride ____________\n water ____________ calcium carbonate ____________\n5. in a chemical equation the reactants are on the left and the products are on the right of the arrow. looking at the reaction below, circle the reactants and put a square around the products.\n ____ cacl₂ + ____nahco₃ → ____caco₃ + ____co₂ + ____h₂o + ____nacl\n balance the reaction:\n ____ cacl₂ + ____nahco₃ → ____caco₃ + ____co₂ + ____h₂o + ____nacl

5. the baggie began to expand. what would the reaction have to generate to make the bag expand? circle one:\nproduction of a solid production of a gas production of a liquid\n6. figuring out the identity of the gas. leave the bag closed for now!\n a. light a wood splint. quickly open the bag, and put the lit splint just inside the bag, but dont touch the edges to melt the bag. take the splint out and quickly reseal the bag. describe what happened.\n carbon dioxide gas will extinguish a lit splint while oxygen gas will reignite a glowing splint.\n b. write a complete sentence on what gas was in the bag and how you know that was the gas in the bag.\n \n7. rinse the baggie in the sink and hang it over the faucet for the next class.\nquestions:\n1. every chemical reaction must make something ____________. if it doesnt it was just a physical change.\n2. what evidence do you have that a chemical reaction occurred?\n a. b. c.\n3. the reactants for this reaction are: cacl₂ and nahco₃. circle a reaction type.\n double replacement single replacement decomposition synthesis\n4. the products for the reaction are: carbon dioxide, calcium carbonate, sodium chloride and water. give the formula for each compound formed. (hint: look at the chemical reaction below)\n carbon dioxide ____________ sodium chloride ____________\n water ____________ calcium carbonate ____________\n5. in a chemical equation the reactants are on the left and the products are on the right of the arrow. looking at the reaction below, circle the reactants and put a square around the products.\n ____ cacl₂ + ____nahco₃ → ____caco₃ + ____co₂ + ____h₂o + ____nacl\n balance the reaction:\n ____ cacl₂ + ____nahco₃ → ____caco₃ + ____co₂ + ____h₂o + ____nacl

Answer

Explanation:

Step1: Answer question 1

A chemical reaction must make something new. If not, it's a physical change.

Step2: Answer question 2

Evidence of a chemical reaction: a. The baggie expanded (production of gas). b. A new substance (gas and other products) was formed. c. A color - change or temperature - change might also be possible but not mentioned here.

Step3: Answer question 3

The reaction type is Double Replacement as the positive and negative ions in the reactants ($CaCl_2$ and $NaHCO_3$) exchange partners.

Step4: Answer question 4

Carbon dioxide: $CO_2$, Sodium chloride: $NaCl$, Water: $H_2O$, Calcium carbonate: $CaCO_3$

Step5: Answer question 5

Reactants: Circle $CaCl_2$ and $NaHCO_3$. Products: Square around $CaCO_3$, $CO_2$, $H_2O$ and $NaCl$. To balance the reaction: $CaCl_2 + 2NaHCO_3 \rightarrow CaCO_3+CO_2 + H_2O+2NaCl$

Answer:

  1. new
  2. a. The baggie expanded. b. New substances were formed. c. (No other evidence mentioned)
  3. Double Replacement
  4. $CO_2$, $NaCl$, $H_2O$, $CaCO_3$
  5. Reactants: Circle $CaCl_2$, $NaHCO_3$. Products: Square around $CaCO_3$, $CO_2$, $H_2O$, $NaCl$. Balanced reaction: $1CaCl_2 + 2NaHCO_3 \rightarrow 1CaCO_3+1CO_2 + 1H_2O+2NaCl$