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
Citrus2011 [14]
3 years ago
6

A teacher is demonstrating physical and chemical changes to her class. Which action should they use to demonstrate a chemical ch

ange?. Single choice.
(5 Points)

Cutting a piece of paper with scissors.

Ripping a piece of paper with their hands.

Burning a piece of paper with a match.

Folding a piece of paper into an airplane.
Chemistry
1 answer:
olya-2409 [2.1K]3 years ago
5 0
Burning a piece of paper with a match.



Explanation:

A chemical change is something that changes the actual make up of an object. It happens at a chemical level and can only sometimes be observable. For example cutting a paper or folding it is not changing the makeup of the paper, just the shape.
You might be interested in
Explain how the ecosystem that you selected follows the law of conservation of mass and the law of conservation of energy. It is
trasher [3.6K]
In the ocean, light is used by phytoplankton in order to produce sugar.  10% of the energy from the sun is available to the zooplankton that eat the phytoplankton, the rest of the energy is lost as heat or through powering body building/functions/reproduction.  Whatever eats the zooplankton receives 10% of that energy in order to grow
3 0
4 years ago
How to find pH value
yuradex [85]

Answer:

take the log of a given hydrogen ion concentration and reverse the sign.

Explanation:

6 0
3 years ago
if .40 L if water is added to the volume of cup 3, what would be the new molarity of a 2 M solution of kool-aid
stiks02 [169]

Answer:

0.7692 M ≅ 0.77 M.

Explanation:

  • It is known that the no. of millimoles of a solution before dilution is equal to the no. of millimoles of the solution after the dilution.
  • It can be expressed as:

<em>(MV) before dilution = (MV) after dilution.</em>

M before dilution = 2.0 M, V before dilution = 0.25 L.

M after dilution = ??? M, V after dilution = 0.25 L + 0.40 L = 0.65 L.

∴<em> M after dilution = (MV) before dilution/(V) after dilution</em> = (2.0 M)(0.25 L)/(0.65 L) =<em> 0.7692 M ≅ 0.77 M.</em>

8 0
4 years ago
Where do 80% of earthquakes occur? please help ??? due in 20 minutes
suter [353]
80% of earthquakes occur along the rim of the pacific ocean.
4 0
3 years ago
Read 2 more answers
Micheal has a substints that he puts in container 1 the substance has a volume of 5 cubic meters
bazaltina [42]

Answer: Solids and liquids don't suddenly change their volumes.

But gases do...they expand to fill whatever container you

put them in.

Michael's mystery substance is in the gaseous phase.

Explanation:

8 0
3 years ago
Other questions:
  • What is the correct formula that would result from the combination of the two ionic species?
    13·1 answer
  • What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles of
    8·1 answer
  • How many moles of oxygen are produced when 26.5 mol of aluminum oxide are decomposed?
    11·2 answers
  • What is the density of a rectangle solid with dimensions
    15·1 answer
  • Do valence electrons have larger or smaller ionization energies that the inner-shell electrons?
    15·1 answer
  • Tonic bonding is the result of electron transfer.
    14·1 answer
  • The electron affinity of an element is positive if energy is absorbed during the process of accepting an electron and negative i
    8·1 answer
  • In the right triangle shown, m\angle V = 60\degreem∠V=60°m, angle, V, equals, 60, degree and UV= 18UV=18U, V, equals, 18.How lon
    6·1 answer
  • Al(s) + NiSO4(aq)<br> Balance
    8·1 answer
  • Kcal/mole
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!