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
Gnesinka [82]
3 years ago
7

When she placed her hand on the side of the container, it felt really cold, but it didn't feel that way before. The temperature

had dropped by about 30 degrees Celsius. The substance was now grey and crystallin in structure.
Was this a chemical reaction?
Answer the question (in a complete sentence) Provide evidence to support your claim and describe (reasoning/justify) how the evidence supports the claim.
Chemistry
2 answers:
artcher [175]3 years ago
3 0

Answer:

this is a physical reaction

Explanation:

wel3 years ago
3 0

Answer:

this is a physical reaction

Explanation:

You might be interested in
What are the number if protons, neutrons, and electrons
marishachu [46]

protons and electrons are both always the atomic number which is 9 in this case.

For neutrons you subtract the atomic number (9) from the weight of the atom (18.998) some teachers will want you to round to the nearest whole (19). We do this because the number of protons is the atomic number so if you subtract the protons from the whole weight of the atom you would have the electrons and neutrons left. Since electrons weigh so little we don't have to subtract them. Weighing neutrons and electrons would be like weighing an elephant (neutrons) and then putting one marshmallow on the scale (electron).  

5 0
3 years ago
When one evaporates a pure substance, what would be seen after this evaporation?
satela [25.4K]

Answer:

3

I would like to understand the temperature at which a substance will vaporize when dissolved in a liquid. I have researched this online for hours, but haven't found a conclusive answer. Is it the boiling point of the dissolved substance? I'm attempting to find the temperature at which caffeine vaporizes when dissolved in water or other vegetable glycerin.

Explanation:

I hope this helps a little bit

4 0
3 years ago
3. Why do you think the image of the pencil inside the beaker of water is different than the pencil
tia_tia [17]

Answer:

the water.

Explanation:

well the water makes things look larger than due to ( the surface of a water drop curves outwards to make a dome. this outward or convex, curature light rays inward. the result is an enlarge ment image on the eye. / makes it look larger) + more mass.

6 0
3 years ago
The density of methanol is 0.7918g/mL. Calculate the mass of 89.9mL of this liquid.
Novosadov [1.4K]
The mass is 71.2 g.

Mass = 89.9 mL × \frac{0.7918 g}{1 mL} = 71.2 g
4 0
3 years ago
When you rub your palms together,
Roman55 [17]

Answer:

sliding friction occurs

4 0
3 years ago
Read 2 more answers
Other questions:
  • What are 3 ways Venus is more like earth than any other planet​
    15·1 answer
  • An element occurs as a mixture of isotopes. The atomic mass of an element is based upon
    9·1 answer
  • Matt, Erin, and Lauren were having a challenge to see who could dissolve a one-pound cube of sugar the quickest. Matt puts his s
    12·2 answers
  • In which phase(s) of matter are the atoms closely packed but still able to slide past each other? gas liquid
    11·2 answers
  • Given 7.20 g of butanoic acid and excess ethanol, how many grams of ethyl butyrate would be synthesized, assuming a complete 100
    10·1 answer
  • How long does it take to cook fries
    12·1 answer
  • Compare and contrast carbon dioxide and water.
    9·1 answer
  • How do alpha particles compare to gamma rays?
    8·2 answers
  • Which of the following are examples of a chemical change?
    10·1 answer
  • What most likely happens when water vapor cools?
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!