Which of the following processes are exothermic? Question 51 options: Two of the options Natural gas...
Which of the following processes are exothermic?
Question 51 options:
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Two of the options |
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Natural gas (CH4) is burned in a furnace. |
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When solid KBr is dissolved in water, the solution gets colder. |
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Ice melts on a hot summer day. |
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When concentrated sulfuric acid is added to water, the solution gets very hot. |
Homework Answers
Add Answer to:
Which of the following processes are exothermic?
Question 51 options:
Two of the options
Natural gas...
1.)For each of the following processes, determine whether the process is spontaneous or non-spontaneous. A.) Nitrogen...
1.)For each of the following processes, determine whether the process is spontaneous or non-spontaneous. A.) Nitrogen and oxygen gas will mix when placed in the same container. B.) Ice melts at −10 °C. C.)Water freezes at −10 °C. D.) Natural gas burns with oxygen in the air to form CO2 and water. E.)A mixture of oil and water will separate into a water layer and an oil layer. 2.) If a solution contains 2.52 M A, 1.60 M B, and...
magnesium chloride to form solid magnesium hydroxide which precipitates out of solution. The other product is...
magnesium chloride to form solid magnesium hydroxide which precipitates out of solution. The other product is sodium chloride which stays in solution. b. Sodium hydroxide is dissolved in water and this solution is added to an aqueous solution of 1. Write the symbols of the reactants. 2. Write the symbols of the products. 3. Write a balanced equation for the reaction. C. When carbon is burned in air, but there is only a limited amount of oxygen available, carbon monoxide...
Which of the following processes removes oxygen from the abiotic environment? Question 20 options: combustion photosynthesis...
Which of the following processes removes oxygen from the abiotic environment? Question 20 options: combustion photosynthesis respiration both respiration and photosynthesis both respiration and combustion both photosynthesis and combustion When we burn fossil fuels, which matter cycle are humans continuing? Question 21 options: carbon phosphorus nitrogen water Cells similar in shape and function work together as Question 22 options: organ systems organs tissues organisms Which of the following is a cure for kidney failure? Question 26 options: hemodialysis renal dialysis...
PROCEDURE 1. Place a reaction tube into a 5-mL Erienmeyer and tare. Add between 0.275- 0.300g...
PROCEDURE 1. Place a reaction tube into a 5-mL Erienmeyer and tare. Add between 0.275- 0.300g of salicylic acid. Record on the data sheet. 2. Transfer the reaction tube and 5-ml Erienmeyer to the hood. Add a boiling chip, 2 drops of 85% phosphoric acid, and about 0.70 mL of acetic anhydride to the reaction tube. Mix well. 3. Place a 50-ml beaker containing about 20-mls of water on a hot plate or in the sand bath. Allow the water...
11. Which one of these elements is not a gas at room temperature? A. chlorine B....
11. Which one of these elements is not a gas at room temperature? A. chlorine B. fluorine C. nitrogen D. oxygen E. sulfur 22. Determine all of the ionic compounds from the compounds listed below. I. CaH2 II. H2S III. SiH4 A. I only B. II only C. I and II D. I and III E. II and III 32. Based on the following options, select the substance with hydrogen in the +1 oxidation state. A. KH B. CH4 C....
2. Write the chemical formulas for the following: b. aluminum a. copper c. hydrochloric acid e....
2. Write the chemical formulas for the following: b. aluminum a. copper c. hydrochloric acid e. copper(II) chloride g. sodium hydroxide i. hydrogen k. carbon dioxide m. calcium carbonate o. aluminum chloride q. calcium chloride d. magnesium sulfate – f. sodium bicarbonate h. methane j. sodium chloride 1. oxygen n. magnesium hydroxide p. sodium carbonate — r. water t. carbon monoxide S. sodium v. iron u. sulfur w.iron (II) sulfide y. sulfuric acid x. magnesium chloride z. sodium sulfate 3....
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like...
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
PartA: Penny-→ Cu2+(aq) Make sure it is dated prior to 1982. Record mass to nearest 0.001 I. Weig...
PartA: Penny-→ Cu2+(aq) Make sure it is dated prior to 1982. Record mass to nearest 0.001 I. Weigh a copper penny. grams. 2. Place 450 mL of distilled water in a clean 600-mL beaker. Place the beaker on a hotplate and heat until the water boils. Do not wait for the water to boil now, but proceed with the rest of the experiment. You will need this water for rinsing in step C3. CAUTION. You will generate poison°แs nitrogen dioxide...
1) Which reactant, salicylic acid or acetic anhydride, is in excess? Show your work. 2) If you we...
1) Which reactant, salicylic acid or acetic anhydride, is in
excess? Show your work.
2) If you were to use 3.17 g of starting material, how much
product would you expect? Again, show your work.
3) Why is phosphoric acid added to the reaction?
4) A small amount of water is added at the end of the reaction
to react with the excess acetic anhydride. Show a balanced equation
for that reaction.
5) Explain the purpose of the FeCl3 test...
What is the SN2 reaction? How does Br attach to which carbon as a nucleophile and...
What is the SN2 reaction? How does Br attach to which carbon as
a nucleophile and why? Difference between Unimolecular or
Bimolecular? How NaBr and H2SO4 work in the
reaction? Why Water/Sulfuric Acid/Brine/Sodium
Hydroxide/Na2SO4 in Extraction? What does
each layer have inside in each step of the separation?
Please help. Due to corona, this is a theoretical lab and I am
very confused.
Chapter 16. The Sy2 Reaction: 1-Bromobutane Handout by Dr. Zhiyong Wang CH3CH2CH2CH, OH NaBr, H2SO4 ©Dr. Wang...
magnesium chloride to form solid magnesium hydroxide which precipitates out of solution. The other product is sodium chloride which stays in solution. b. Sodium hydroxide is dissolved in water and this solution is added to an aqueous solution of 1. Write the symbols of the reactants. 2. Write the symbols of the products. 3. Write a balanced equation for the reaction. C. When carbon is burned in air, but there is only a limited amount of oxygen available, carbon monoxide...
PROCEDURE 1. Place a reaction tube into a 5-mL Erienmeyer and tare. Add between 0.275- 0.300g of salicylic acid. Record on the data sheet. 2. Transfer the reaction tube and 5-ml Erienmeyer to the hood. Add a boiling chip, 2 drops of 85% phosphoric acid, and about 0.70 mL of acetic anhydride to the reaction tube. Mix well. 3. Place a 50-ml beaker containing about 20-mls of water on a hot plate or in the sand bath. Allow the water...
2. Write the chemical formulas for the following: b. aluminum a. copper c. hydrochloric acid e. copper(II) chloride g. sodium hydroxide i. hydrogen k. carbon dioxide m. calcium carbonate o. aluminum chloride q. calcium chloride d. magnesium sulfate – f. sodium bicarbonate h. methane j. sodium chloride 1. oxygen n. magnesium hydroxide p. sodium carbonate — r. water t. carbon monoxide S. sodium v. iron u. sulfur w.iron (II) sulfide y. sulfuric acid x. magnesium chloride z. sodium sulfate 3....
than other labs. These are toxicity, volatility, and flammability. We routinely use toxic organic solvents like methanol and acetone that are volatile (have low boiling points), but even solid organic materials can produce vapors that may be toxic. Furthermore, organic materials are flammable, and solvent vapors in the air can and do produce explosive mixtures. You should take some general precautions when doing organic chemistry: Do not get solutions on your skin. You do not need to always wear gloves...
PartA: Penny-→ Cu2+(aq) Make sure it is dated prior to 1982. Record mass to nearest 0.001 I. Weigh a copper penny. grams. 2. Place 450 mL of distilled water in a clean 600-mL beaker. Place the beaker on a hotplate and heat until the water boils. Do not wait for the water to boil now, but proceed with the rest of the experiment. You will need this water for rinsing in step C3. CAUTION. You will generate poison°แs nitrogen dioxide...
1) Which reactant, salicylic acid or acetic anhydride, is in
excess? Show your work.
2) If you were to use 3.17 g of starting material, how much
product would you expect? Again, show your work.
3) Why is phosphoric acid added to the reaction?
4) A small amount of water is added at the end of the reaction
to react with the excess acetic anhydride. Show a balanced equation
for that reaction.
5) Explain the purpose of the FeCl3 test...
What is the SN2 reaction? How does Br attach to which carbon as
a nucleophile and why? Difference between Unimolecular or
Bimolecular? How NaBr and H2SO4 work in the
reaction? Why Water/Sulfuric Acid/Brine/Sodium
Hydroxide/Na2SO4 in Extraction? What does
each layer have inside in each step of the separation?
Please help. Due to corona, this is a theoretical lab and I am
very confused.
Chapter 16. The Sy2 Reaction: 1-Bromobutane Handout by Dr. Zhiyong Wang CH3CH2CH2CH, OH NaBr, H2SO4 ©Dr. Wang...
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