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Andru [333]
3 years ago
15

A green solution of a pH indicator was added to a sample of spring water. The resulting solution was yellow. Was the observed ch

ange due to a physical or a chemical change
Chemistry
1 answer:
adell [148]3 years ago
7 0

Answer:

Chemical Change

Explanation:

Color changes in chemical compounds are as a result of chemical reactions between the two reactant , and in this case a new reactant is been formed.

which eventually changes the color to yellow.

Indicators like Leucomalachite green do changes from green ( base) to yellow (acidic).

So for a new product to be formed which is of different color and chemical properties,the observation change is definitely a chemical change

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Color, hardness, solubility, mass, density, volume, and melting point are all examples of what type of property?
katovenus [111]

Physical properties.

7 0
3 years ago
A sample of propane (C3H8) has a mass of 0. 47 g. The sample is burned in a bomb calorimeter that has a mass of 1. 350 kg and a
Nady [450]

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

The specific heat has been defined as the amount of heat required to raise the temperature of 1 gram of substance by 1 degree Celsius.

The specific heat has been expressed as:

q=mc\Delta T

<h3 /><h3>Computation for the heat absorbed</h3>

The iron and calorimeter are in side the closed system. Thus, the energy released by the sample, has been equivalent to the energy absorbed by the calorimeter.

q_{released}=q_{absorbed}\\&#10;q_{released}=m_{calorimeter}\;c_{calorimeter}\;\Delta T

The given mass of calorimeter has been, m_{calorimeter}=1350\;\rm g

The specific heat of the calorimeter has been, c_{calorimeter}=5.82\;\rm J/g^\circ C

The change in temperature of the calorimeter has been, \Delta T=2.87^\circ \rm C

Substituting the values for heat released:

q_{released}= 1350\;\text g\;\times\;5.82\;\text J/\text g^\circ \text C\;\times\;2.87^\circ \text C\\&#10;q_{released}=22,549.5\;\text J\\&#10;q_{released}}=22.54\;\rm kJ

The amount of heat released by the sample has been 22.54 kJ. Thus, option C is correct.

Learn more about specific heat, here:

brainly.com/question/2094845

6 0
3 years ago
Atoms become excited when they are heated by a flame. How do atoms return from an excited state to a ground state?
ohaa [14]
Atoms return to their ground state by emitting a photon of light.
8 0
3 years ago
PLEASE HELP!!!
yuradex [85]

This might be right. Im not quite sure. This is what my 5th grade science teacher told me. 'Look at the 2 LR's and add them together. Then look at the total amount which is 32. When you add the 2 LR's you get 17. So subtract 17 from 32 and you get 15. So: C:15 is your answer." (LR's stands for liquid reactants)

10+17=17

Total amount is 32

32-17=15

15 is you mass

Hope this Helps

7 0
3 years ago
Read 2 more answers
Which of the following is NOT true of physical changes? Question 3 options: Substances change form or shape Substances remain th
dsp73

Chemical bonds are formed or broken. This is true of a chemical change, but not a physical change. A physical change is usually something that you can see, such as changing of shape or form or staying the same.  However, because you cannot visibly see chemical bonds being formed or broken and because this would affect the chemical composition, it is not a physical change.

6 0
3 years ago
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