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3 years ago

Please help i’ll mark brainliest

Chemistry

1 answer:

Lynna [10]3 years ago

3 0

Answer:

Physical change

Explanation:

Chemical change is defined as the process in which new substance with different properties is formed from old substance and the process is irreversible while physical change is a reversible process and changes only physical properties of a substance.

<em>The given experiment is an example of physical change because it is just the physical act of dissolving. The metal disk is dissolving in sodium acetate and the process is exothermic and the process is reversible as well.</em>

Hence, the correct answer is "physical change".

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Density differences in different materials are able to change the of a wave. A)Amplitude B)Crest C)Speed D)Trough

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Answer:

C. Speed

Explanation:

Density differences in different materials are able to change the speed of a wave.

Wave speed is dependent on the frequency and wavelength of a wave.
As a wave travels from one medium to another, the speed of the wave changes.
Speed of a wave is medium dependent.
The denser a medium, the slower the speed of waves will be be.
A less dense medium will have waves traveling through faster.

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Answer:

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e. all of the above

Explanation:

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4 years ago

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sineoko [7]

6942.72
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3 years ago

A group on the periodic table is best described as a _________.

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The accepted value for the density of iron is 7.87 g/cm3. A student records the mass of a 20.00-cm3 block of iron as 153.8 grams

dimaraw [331]

Answer:

The percent error of the density calculation is 2.2872%

Explanation:

Accepted value for the density of iron = 7.87 g/cm3

Mass = 153.8 g

Volume = 20 cm3

Percent error?

Percent error, sometimes referred to as percentage error, is an expression of the difference between a measured value and the known or accepted value. It is often used in science to report the difference between experimental values and expected values.

The formular is given below as;

$Percent error = \frac{Experiment Value - Accepted Value}{Aceepted Value} * 100$

Steps to Calculate the Percent Error

Subtract the accepted value from the experimental value.
Take the absolute value of step 1
Divide that answer by the accepted value.
Multiply that answer by 100 and add the % symbol to express the answer as a percentage.

Density = Mass / Volume = 153.8 / 20 = 7.69g/cm3

Experiment Value = 7.69g/cm3

Step 1

Experiment Value - Accepted Value = 7.69 - 7.87 = -0.18

Step 2

|-0.18 g/cm3| = 0.18 g/cm3

Step 3

0.18 / 7.87 = 0.02287

Step 4

0.02287 * 100 = 2.2872%

The percent error of the density calculation is 2.2872%.

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3 years ago