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
lina2011 [118]
3 years ago
12

Which of the following is an exothermic reaction?

Chemistry
2 answers:
Alika [10]3 years ago
4 0
I think the correct answer among the choices listed above is option B. Condensation is a process which an exothermic one. Exothermic processes involves heat being released to the environment which is evident in the process of condensation.
Sauron [17]3 years ago
3 0

<u>Answer:</u> The correct answer is Option B.

<u>Explanation:</u>

Exothermic reaction is defined as the reaction in which heat is released to the surroundings from the system. The total enthalpy change of the reaction comes out to be negative.

Endothermic reactions are the ones where heat is absorbed from the surrounding by the system. The total enthalpy change of this reaction comes out to be positive.

For the given options:

<u>Option A:</u> When ammonium nitrate is added in the water to cool it, the heat is getting absorbed. Then only the water is getting cooled. Thus, it is considered as an endothermic reaction.

<u>Option B:</u> Condensation is a process in which gaseous state changes into liquid state. The temperature of the system gets reduced and thus heat is getting released in this process. Thus, it is considered as an exothermic reaction.

<u>Option C:</u> Melting is a physical process in which solid state is converted into liquid state. To do this, heat must be provided to separate the particles from one another. Thus, it is considered as an endothermic reaction.

<u>Option D:</u> When sugar is dissolved in water, heat is provided so that it gets completely dissolved. Thus, it is considered as an endothermic reaction.

Hence, the correct answer is Option B.

You might be interested in
14. How many liters would 5 moles of oxygen gas take up?
andrew-mc [135]

Answer:

a 0.22L

Explanation:

8 0
3 years ago
Read 2 more answers
Jerry listed the following process on his notebook:
topjm [15]

Answer:

2

Explanation:

1. The dew is formed when the water vapor at the atmosphere contacts the leaves, which are at a low temperature, so, the vapor temperature decreases, and the liquid is formed. So, it's a gas to liquid change.

2. Ice cubes are at the solid-state, thus this transformation is solid to a liquid change.

3. The cold juice is at a low temperature, so when the water vapor of the air contacts with the glass, its temperature decreases, and its change to a liquid phase. So, it's a gas to liquid change.

4. The evaporated water from the Earth's surface goes to the atmosphere, and, at high altitudes, the temperature is low, so the water vapor condenses and the drops get closer together forming the clouds. So, it's a gas to a liquid change.

5 0
3 years ago
Write the formula for Zn+2 (SO4)-2
Pie

Answer:

Zn2 + SO4 = Zn2(SO4)2

Explanation:

4 0
3 years ago
How does a sample of hydrogen at 10 °C compare to a sample of hydrogen at 350 K?
Andrej [43]

Answer: -

C. The hydrogen at 10 °C has slower-moving molecules than the sample at 350 K.

Explanation: -

The kinetic energy of gas molecules increase with the increase in the temperature of the gas. With the increase in kinetic energy, the gas molecules also move faster. Thus with the increase of temperature, the speed of the molecules increase.

Temperature of first hydrogen gas sample is 10 °C.

10 °C means 273+10 = 283 K

Thus first sample temperature = 283 K

The second sample temperature of the hydrogen gas  is 350 K.

Thus the temperature is increased.

So both the kinetic energy and speed of molecules is more for the hydrogen gas sample at 350 K.

Thus the hydrogen at 10 °C has slower-moving molecules than the sample at 350 K.

Hence the answer is C.

7 0
3 years ago
Read 2 more answers
NEED ANSWERS ASAP!!! 20 POINTS IF YOU ANSWER ALL QUESTIONS(NO LINKS, SPAMMING OR GUESSING)
Vlad [161]

Captionless Image

sepal

pollen tube

filament

Stigma

Renewable energy resources are?

A resource that cannot be readily replaced by natural means on a level equal to its use.

Invisible resources

Renewable resources that can be naturally restored.

All the above

To produce perfumes for Man

This is energy that is stored for later use.

kinetic energy

potential energy

mechanical energy

electromagnetic energy.

When fertilization has occurred the fertilized ovule changes and so does the ovary. What do they turn into?

The fertilized ovule turns into the fruit and the ovary turns into the seed.

The ovule grows bigger and the ovary withers.

The fertilized ovule turns into a seed and the ovary turns into the fruit or pod.

The fertilized ovule turns into honey and the ovary turns into nectar.

What is energy?

1 point

moving energy

stored energy

renewable energy

The ability to do work.

Wind-pollinated flowers usually have ______ and ________ petals.

1 point

big ... bright

small .... bright

big ... dull

small ... dull

What is the function of nectar?

To provide food for the flower

To attract pollinators

To attract animals to disperse the fruits

Which of the following devices transforms electrical energy into mechanical energy?

1 point

An e-reader

a fan

a manual pencil sharpener

iPod

its one of these and chillll

3 0
3 years ago
Other questions:
  • Please help me!! I really need help! If you can help explain the work I would really appreciate it! Thank you have a wonderful d
    13·1 answer
  • In the reaction represented by the equation N2(g) + 3H2(g) 2NH3(g), the
    7·1 answer
  • Explain the difference between a ph of 8 and a ph of 12 in terms of h concentration
    13·1 answer
  • Compound X has a molar mass of 283.89 mol^-1 and the following composition:
    5·1 answer
  • Balanced chemical equation:Copper( ii) oxide solid +dilute sulphuric acid​
    12·1 answer
  • A student sets up a box with a flashlight that shines on a mirror located at position X. Other possible locations for objects in
    9·2 answers
  • Which statement best explains the purpose of using a mole in the measurement of matter? It is commonly used as another unit of m
    5·2 answers
  • Please helpppp I have a quiz tomorrow for Science and I'm having a hard time studying!!!!
    5·1 answer
  • explain what happens if high pressure is implemented on the equilibrium reaction . State your observations for both rate of reac
    13·1 answer
  • The hormone epinephrine is released in the human body during stress and increases the body's metabolic rate. Epinephrine, like m
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!