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lisabon 2012 [21]
3 years ago
14

How can you tell a chemical change has happened?

Chemistry
2 answers:
Paladinen [302]3 years ago
4 0

Answer:

How can I tell if a chemical reaction is occurring? A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Explanation:

Kisachek [45]3 years ago
3 0

Answer:

You can tell when a chemical change has happened when the chemical changes in appearance such as color or physical state.

Explanation:

If a change happens it can change in any way shape or form.

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a sample of a substance has a mass of 52.5g and displaces a volume of 4.2ml. what is the density of the substance
Lena [83]

Answer:

<h2>Density = 12.5 g/mL</h2>

Explanation:

The density of a substance can be found by using the formula

Density =  \frac{mass}{volume}

From the question

mass = 52.5 g

volume = 4.2 mL

Substitute the values into the above formula and solve for the density

We have

Density =  \frac{52.5}{4.2}  \\

We have the final answer as

<h3>Density = 12.5 g/mL</h3>

Hope this helps you

3 0
4 years ago
What is the frequency of a light that has a wavelength of 3.0 x 10 -7m?
alexdok [17]

Answer:

 frequency of light (f) = 1 x 10¹⁵s⁻¹

Explanation:

Given Data:

Wavelength of light λ = 3.0 x10⁻⁷m

Frequency of light: to be calculated

Formula Used to find frequency:

                                  f = V/λ ........................... (1)

where

f is the frequency

V is the velocity

λ is wavelength

Velocity of light = 3 x 10⁸ ms⁻¹

put the values in equation (1)

                                     f =  3 x 10⁸ ms⁻¹ / 3.0 x10⁻⁷m

                                     f = 1 x 10¹⁵s⁻¹

   So the frequency of light =  1 x 10¹⁵s⁻¹

7 0
3 years ago
Returns water that has evaporated back to Earth's surface
Misha Larkins [42]
The answer would be A precipitation


3 0
3 years ago
The ISS experiences ___ of Earth’s gravity.<br> 90%<br><br> 10%<br><br> 75%<br><br> 50%
astraxan [27]

Answer:

90%

Explanation:

7 0
3 years ago
Predict the energy trend as a substance changes from a solid to liquid to gas on this graph.
Vladimir [108]
Answer:
            Option-A (<span> It would increase from bottom left to top right) is the correct answer.

Explanation:
                   As we know converting solids into liquids and converting liquids into gases require energy. This energy provided increases the energy of the state and its particles start moving with higher velocities. Therefore, the energy of solids will be lower than liquids and gases respectively. While, liquids have greater energy than solids but less energy than gases. And, gases are the most energetic than solids and liquids.</span>
8 0
3 years ago
Read 2 more answers
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