1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
V125BC [204]
3 years ago
14

Consider the reaction: C2H5OH(ℓ) + 3O2(g) → 2CO2(g) + 3H2O(ℓ); ∆H = –1.37 x 103 kJ Consider the following statements: I. The rea

ction is endothermic II. The reaction is exothermic. III. The enthalpy term would be different if the water formed was gaseous. Which of these statement(s) is (are) true?
Chemistry
1 answer:
malfutka [58]3 years ago
4 0

Answer:

Two statements are true:

  • II. The reaction is exothermic.
  • III. The enthalpy term would be different if the water formed was gaseous.

Explanation:

  • C₂H₅OH(ℓ) + 3O₂(g) → 2CO₂(g) + 3H₂O(ℓ); ∆H = –1.37 × 10³ kJ

1. ∆H = –1.37 × 10³ kJ it telling that the enthalpy of the reaction is negative.

That means that reaction releases heat, which, by definition, means that the reaction is exothermic.

Then statement I is false and statement II is true.

2. The enthalpy of a reaction is equal to the enthalpy of the products less the enthalpy of the reactants:

       \Delta H_{rxn}=\sum (H_{products})-\sum (H_{reactants})

The enthalpy of each substance depends on its state, thus the enthalpy term for water will be different if it is formed as a gas than if it is formed a liquid.

Hence, the enthalpy of the reaction will be different in case the water formed was gaseous, and the third statement is also true.

You might be interested in
Which environment is BEST for an organism that sleeps during the day and digs holes in the ground for shelter?
Zigmanuir [339]
I’d probably say a forest or a dessert
6 0
3 years ago
If 5.1 l of antifreeze solution (specific gravity = 0.80) is added to 3.8 l of water to make a 8.9 l mixture, what is the specif
Maslowich
Density of the mixture = mass of the mixture / volume of the mixture

Mass of the mixture = mass of antifreeze solution + mass of water.

Mass of antifreeze solution = density of the antifreeze solution * volume

Mass of antifreeze solution = 0.8g/ml * 5.1 l * 1000 ml / l = 4,080 g

Mass of water = density of water * volume of water = 1.0 g/ml * 3.8 l * 1000 ml / l = 3,800 g

Mass of mixture = 4080 g + 3800 g= 7880 g

Volume of mixture = volume of antifreeze solution + volume of water

Volume of mixture = 5100 ml + 3800 ml = 8900 ml

Density of mixture = 7800 g / 8900 ml = 0.876 g/ml

Specific gravity of the mixture = density of the mixture / density of water = 0.876

Answer: 0.876
3 0
4 years ago
Which layer of the atmosphere is between the exosphere and the mesosphere
Olenka [21]

The atmosphere of earth is made of five main layers.

1) Troposphere : This is the lowest part of the atmosphere. Most of the air that makes up the atmosphere is present in this layer.

2) Stratosphere : This layer is present above troposphere and extends up to 50 km. It contains ozone layer which prevents the harmful ultraviolet rays from the sun from entering the lower troposphere

3) Mesosphere : The layer above stratosphere is known as mesosphere.

4) Thermosphere : The region lies above mesosphere.

5) Exosphere : The is the outermost region of the atmosphere.

From the above discussion we can see that the layer that lies between exosphere and mesosphere is Thermosphere

8 0
3 years ago
Read 2 more answers
If a solution is given to you, how will you determine whether it is acid,base or salt​
12345 [234]

Answer:

If your lab has litmus paper, you can use it to determine your solution's pH. When you place a drop of a solution on the litmus paper, the paper changes color based on the pH of the solution. Once the color changes, you can compare it to the color chart on the paper's package to find the pH.

Explanation:

A solution's pH will be a number between 0 and 14. A solution with a pH of 7 is classified as neutral. If the pH is lower than 7, the solution is acidic. When pH is higher than 7, the solution is basic. These numbers describe the concentration of hydrogen ions in the solution and increase on a negative logarithmic scale.

For example, If Solution A has a pH of 3 and Solution B has a pH of 1, then Solution B has 100 times as many hydrogen ions than A and is therefore 100 times more acidic.

5 0
3 years ago
Directions: Read the paragraph and identify the correct words that fit in the given sentences
TiliK225 [7]

Answer:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

Explanation:

In the given paragraph a brief about the difference between element and compound is given.

Elements are made up of the same type of atoms and each element is made up of one atom, that is they cannot be broken down into any other substance. Each element is different from each other due to its properties, though some have the same physical properties but are different in chemical properties.  Elements can be classified as metals such as iron and silver, non-metals such as oxygen and hydrogen, and metalloids such as boron and silicon.

Compounds are a combination of one or more elements such as water and salt. Compounds can be easily broken down into components through a chemical process.

Hence, the correct answer is:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

8 0
3 years ago
Other questions:
  • Apply the appropriate word to the definition indicated please! Not all words have to be used
    11·2 answers
  • What metric measurement is similar to a mile?
    10·2 answers
  • Chromium(III) oxide reacts with hydrogen sulphide gas to form chromium(III) sulphide and water. How many grams of hydrogen sulph
    8·1 answer
  • A chemical process that takes place in an organism and is essential to life is called?
    10·1 answer
  • An observation which requieres measuresment is called
    9·1 answer
  • How would you describe an isotope?
    6·1 answer
  • Which techniques would be best for separating a
    9·1 answer
  • Adaptations result from interactions between organisms and their___.
    6·1 answer
  • A sample of ammonia gas occupies a volume of 2.23 L at 20°C and a pressure of 0.875 atm. What
    11·1 answer
  • Prove that the liquid pressure is directly proportional to the depth of the liquid?​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!