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
Elena L [17]
3 years ago
13

SCIENCEEEE!!!!! HELPPPP!!!!

Chemistry
2 answers:
Wittaler [7]3 years ago
7 0

Answer:

I would say Both are only physical changes.

Explanation:

Melting wax isn't creating a new substance, or changing the atomic structure. The wax is only changes from a solid to a liquid state. Sanding a piece if wood is usually done with sandpaper, which can physically be done with your hands. Hope this helped :)

IRINA_888 [86]3 years ago
5 0

pretty sure it's both are physical changes.

You might be interested in
Why is it important to note the temperature when determining the density of a substance?
Andru [333]
It is important to take note of th temperature in determining the density of a substance because this will set as a basis and will likely be a variable in the experiment because this will also contribute on the effects of the experiment and a basis of how the experiment has turned to be that way.
7 0
3 years ago
What is a flammable mixture of many different substances
Wittaler [7]
The correct answer you are looking for is napalm 

Hope this helps!
5 0
3 years ago
Write and balance the half-reaction for the oxidation of white phosphorous P4 to the phosphate ion PO3^−4 in a basic solution.
aalyn [17]

Since the half-reaction is occurring in a basic solution, add 32OH− to each side of the equation to eliminate the H+ ions.

P₄ +16H₂O + 32OH⁻ ⟶ 4PO₃⁻⁴ + 32H⁺ +32OH⁻

Final reaction :

P₄ + 32OH⁻ ⟶ 4PO₃⁻⁴ + 16H₂O + 20e⁻

A half reaction is either the oxidation or reduction reaction component of a redox reaction. A half reaction is obtained by considering the change in oxidation states of individual substances involved in the redox reaction.

The concept of half-reactions is used to describe what occurs in an electrochemical cell, such as a Galvanic cell battery. Half-reactions can be written to describe both the metal undergoing oxidation (known as the anode) and the metal undergoing reduction (known as the cathode).

Half-reactions are often used as a method of balancing redox reactions. For oxidation-reduction reactions in acidic conditions, after balancing the atoms and oxidation numbers, one will need to add H+ ions to balance the hydrogen ions in the half reaction.

For oxidation-reduction reactions in basic conditions, after balancing the atoms and oxidation numbers, first treat it as an acidic solution and then add OH- ions to balance the H+ ions in the half reactions (which would give H2O).

Learn more about Half reactions here : brainly.com/question/2491738

#SPJ4

3 0
2 years ago
Salt is dissolved in a flask of tap water. Distilling the mixture causes the salt to separate from the water. Which type of ener
Alik [6]
Heat energy is required.
In distillation, the solution is first heated, where heat energy is required, such as using a bunsen burner.
When the solution is heated, the water may reach its boiling point and evaporate. However, salt does not. When water molecules evaporates, it travels through a condenser that cools it down into liquid again. Therefore we get pure water. Salt is also obtained in the original beaker.
Therefore to first start this process, heat energy is required.
6 0
3 years ago
Read 2 more answers
The molecular formula of butane is C4H10. It is obtained from petroleum and is used commonly in LPG (Liquefied Petroleum Gas) cy
LUCKY_DIMON [66]

Answer:

Explanation:

Butane is an alkane and has no multiple bond in it.

The isomers of butane are

a) n-butane

b) t-butane

The structures are shown in the figure.

The most stable radical will be tertiary butyl radical.

The structures are shown in figure.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Why is it reasonable to assume the specific heats of naoh and hcl solutions are the same as water?
    5·1 answer
  • How does acid rain happen? (Use the term Sulfur Dioxide) PLS HALP
    10·1 answer
  • For the following aqueous reaction, complete and balance the molecular equation and write a net ionic equation, making sure to i
    12·1 answer
  • HELPPPPPPPPPP!!!!!!!!!!!!!!
    15·2 answers
  • Calorimeter containing 1000 grans of water the initial temperature of water is 24.85 degrees . the heat of water is 4.184 j/g de
    5·1 answer
  • Use the law of conservation of mass to answer the questions. Consider a hypothetical reaction in which A and B are reactants and
    14·1 answer
  • Hope is testing a substance using blue litmus paper. The paper turns red. The substance is _____.
    8·2 answers
  • Name the valency and symbol of acidic radicals ​
    14·1 answer
  • Select the correct answer from each drop-down menu. Complete the sentences to explain how the oceans on Earth were formed. Water
    15·1 answer
  • An orgo lab student named Bob wanted to synthesize an isoamyl acetate ester because it smells like bananas and he really likes t
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!