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
Fynjy0 [20]
3 years ago
8

How are physical and chemical changes different

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

Answer:

physic

Explanation:

physical chnages are chnages to the appearance

chemical chnages are chnages like

color temperature chnaging fromna gas to a liquid etc

mariarad [96]3 years ago
3 0

Answer:

Explanation:

Physical changes do not change the properties of the initial substance. Physical changes are temporary. For eg if you boil water, it turns into vapor. It's chemical composition is still H2O but now its just in gas form instead of liquid but overtime that gas will condensate into water. SO physical changes are reversible most of the times.

Chemical changes change the properties of initial substance. Like burning wood, you can't really reverse this reaction because you can't go from coal to wood, its permanent change. So chemical changes are permanent changes. Like souring milk, acid-base reactions, rotting banana etc.

You might be interested in
The second-order diffraction for a gold crystal is at an angle of 22.20o for X-rays of 154 pm. What is the spacing between the c
Alenkinab [10]

<u>Answer:</u> The spacing between the crystal planes is 4.07\times 10^{-10}m

<u>Explanation:</u>

To calculate the spacing between the crystal planes, we use the equation given by Bragg, which is:

n\lambda =2d\sin \theta

where,

n = order of diffraction = 2

\lambda = wavelength of the light = 154pm=1.54\times 10^{-10}m     (Conversion factor:  1m=10^{12}pm )

d = spacing between the crystal planes = ?

\theta = angle of diffraction = 22.20°

Putting values in above equation, we get:

2\times 1.54\times 10^{-10}=2d\sin (22.20)\\\\d=\frac{2\times 1.54\times 10^{-10}}{2\times \sin (22.20)}\\\\d=4.07\times 10^{-10}m

Hence, the spacing between the crystal planes is 4.07\times 10^{-10}m

4 0
3 years ago
What is the formula for the ionic compound of strontium and chlorine?
Leno4ka [110]
The formula is SrCl2. hope this helps
8 0
3 years ago
3. A helium laser emits light with a wavelength of 6.33 x 10^-7m. What is
HACTEHA [7]

Answer:

4.52 x 10¹⁴ cycles/s

Explanation:

From c = f·λ => f = c/λ = (3.0 x 10⁸ m/s)/(6.63 x 10⁻⁷m) = 4.52 x 10¹⁴ cycles/s.

f = frequency = ?

λ = wavelength = 6.63 x 10⁻⁷ meter

c = speed of light in vacuum = 3.0 x 10⁸ meters/s

7 0
3 years ago
For a reaction at equilibrium, which change can increase the rates of the forward and reverse reactions?a decrease in the concen
Monica [59]
Question requires a change resulting in an increase in both forward and reverse reactions. Now lets discuss options one by one and see there impact on rate of reactions.

1) <span>A decrease in the concentration of the reactants:
                                                                                       
When concentration of reactant is decreased it will shift the equilibrium in Backward direction, so resulting in increasing the backward reaction and decreasing the forward direction. Hence, this option is incorrect.

2) </span><span>A decrease in the surface area of the products:
                                                                               Greater the surface Area greater is the chances of collision and greater will be the rate of reaction. As the surface area of products is decreased it will not favor the backward reaction. Hence again this statement is incorrect according to given statement.

3) </span><span>An increase in the temperature of the system:
                                                                             An increase in temperature will shift the reaction in endothermic side. Hence, if the reaction is endothermic, an increase in temperature will increase the rate of forward direction or if the reaction is exothermic it will increase the rate of reverse direction. Hence, this option is correct according to given statement.

4) </span><span>An increase in the activation energy of the forward reaction:
                                                                                                   An increase in Activation energy will decrease the rate of reaction, either it is forward or reverse. So this is incorrect.

Result:
          Hence, the correct answer is,"</span>An increase in the temperature of the system".
7 0
3 years ago
Light brings many chemical changes. Can you think of any chemical change brought about by light? ​
strojnjashka [21]

Answer:

MRCORRECT has answered the question

Explanation:

Film photography is another example ofchemical reaction by light. In this example, the chemical compounds coated on the film go through a chemical reaction. ... These plates (usually made of aluminum) are coated with a photosensitive compound consisting of a polymer and a photosensitivechemical system.

4 0
3 years ago
Other questions:
  • Why was helium absent from mendeleev's original periodic table of 1871?
    7·1 answer
  • Which measurement shows a valid estimate for<br> this ruler?<br> 2.3 cm<br> 2.35 cm<br> 2.350 cm
    13·1 answer
  • How might a theory relate to a model
    8·1 answer
  • If the [H+] = 0.01 M, what is the pH of the solution, and is the solution a strong acid, weak acid, strong base, or weak base?
    12·1 answer
  • An atom contains on proton, one electron, and one neutron. Which two particles are most similar in mass
    15·2 answers
  • Whereas sodium is found mainly in the extracellular fluid, most ________ is found in the intracellular fluid.A) ironB) chlorideC
    8·1 answer
  • In the Energy and Specific Heat lab, what temperature should be recorded as the final temperature of the water when measuring th
    15·1 answer
  • Help me Please! I don’t understand it
    5·1 answer
  • State the property of a conducting wire which is utilised in making electric fuse.
    8·1 answer
  • What is the molarity of a solution prepared from 85. 0 g cacl2 in 300. 0 g of solution? the density of the solution is 1. 05 g/m
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!