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
nekit [7.7K]
3 years ago
14

Which phase change is an example of an exothermic process?

Chemistry
2 answers:
guajiro [1.7K]3 years ago
8 0

Answer:

C

Explanation:

Turning liquid to a solid is like freezing water to ice and requires the water to LOSE (release) heat causing an exothermic reaction.

Sergio039 [100]3 years ago
6 0
C is an exothermic process. To form solid from a liquid, heat energy must be realised to push particles together and form bonds.
An endothermic process is when heat is absorbed to break bonds between particles (liquid-> gas)
You might be interested in
Trans-2-butene does not exhibit a signal in the double-bond region of the spectrum (1600–1850 cm−1); however, ir spectroscopy is
Elza [17]
However <em>trans</em>-2-Butene does not give a characteristic peak in 1620-1680 cm⁻¹ region but still the presence of carbon double bond carbon can be detected by detecting following peaks in IR Spectrum.

1)  3010-3100 cm⁻¹:
                               As in trans-2-Butene a hydrogen atoms ate attached to sp² hybridized carbon, therefore the stretching of =C-H (C-H) bond will give a peak of medium intensity in the range of 3010-3100 cm⁻¹.

2)  675-1000 cm⁻¹:
                             Another peak which is given by the bending of =C-H (C-H) bond with strong intensity will appear in the range of 675-1000 cm⁻¹.
3 0
4 years ago
Why do we need to rinse the mouth before collecting the saliva​
Burka [1]
The rinsing of mouth is to remove food particles and minimize mucous
6 0
3 years ago
Anabolic reactions _______ bonds, whereas catabolic reactions __________ bonds. A. decrease; increase. B. break; make C. weaken;
nexus9112 [7]

Answer:

The corrext answer is E. make; break

Explanation:

In living organisms, the metabolism is either anabolic or catabolic where anabolic metabolism is energy consuming and catabolic metabolism is eneegy releasesing. It should however be noted that anabolic reaction builds or biosynthesize new mollecular structures while catabolic reaction breaks down complex structure bonds into simple structures

The braking down of bonds in catabolic reations realeses energy to sustain the anabolic rection process for the formation of new bonds

6 0
3 years ago
How many grams are in 4.5 x 10^22 molecules of water? please show dimensional analysis
GaryK [48]

Answer:

1.1grams

Explanation:

Find moles of water:

4.5x10^22/(6.02x10^23)=0.07mol

Find molar mass of the water

O=16.00g/mol

0.07x 16.00=1.1 grams

4 0
3 years ago
Why is a pyramid shape used to represent the energy in an Ecosystem?​
Salsk061 [2.6K]

Answer:

An energy pyramid shows the flow of energy at each trophic level in an ecosystem. A pyramid shape is used because energy is lost at each trophic level when organisms use it up.

Explanation:

6 0
3 years ago
Other questions:
  • At a constant pressure and amount of gas, how are temperature and volume related?
    13·1 answer
  • In an experiment, a compound was determined to contain 68.94% oxygen and 31.06% of an unknown element by weight. The molecular w
    9·1 answer
  • For the first ionization energy for an N2 molecule, what molecular orbital is the electron removed from
    7·1 answer
  • What are atoms that have gained or lost electrons?
    14·2 answers
  • Choose the appropriate volumetric device to use for each of the volume measuring applications.
    13·1 answer
  • A rock contains uranium 238 which has a half life of 4.5 billion years. if the rock is crushed and heated, the half life in urai
    12·1 answer
  • What does Mg stand for in chemistry
    13·2 answers
  • A gas sample occupies a volume of 1.264 L when the temperature is 168.0 °C and the pressure is 946.6 torr. How many molecules ar
    10·1 answer
  • Using the periodic table, choose the more reactive nonmetal.<br> Te or O
    6·2 answers
  • PLEASE HELP! ILL GIVE BRAINLIEST, EXPLAIN YOUR ANSWER PLS
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!