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I am Lyosha [343]
3 years ago
7

Which of the following is an example of a chemical reaction?

Chemistry
1 answer:
FrozenT [24]3 years ago
6 0
All of the above are chemical reactions.
If that is a choice 
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If a fast-moving car making a loud noise approaches and moves past the person, what will happen as the distance between the two
Pani-rosa [81]

Correct answer choice is :


D) The pitch of the sound being heard by the person will appear to be lower than the pitch of the source.


Explanation:


The sensation of a frequency is usually related to as the pitch of a sound. A high pitch sound relates to a high-frequency sound wave and a low pitch sound relates to a low-frequency sound wave. Whereas loudness depends on the power of the wave. In overall, the pitch is the cause behind the variation in voice quality for several people. The pitch of a sound depends on the frequency while loudness of a sound depends on the amplitude of sound waves.

5 0
3 years ago
Read 2 more answers
when the volume of a gas is changed from 250 mL to 425 mL, the temperture will change from 137 degrees celsius to _____ degrees
FrozenT [24]
Charles law gives the relationship between temperature and volume of gas.
It states that at a constant pressure, volume of gas is directly proportional to the temperature for a fixed amount of gas.
V/T = constant
where V- volume, T- temperature 
V1/T1 = V2/T2
Where parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation
temperature should be in Kelvin for calculation
temperature in K = temperature in Celcius + 273
T1 = 137 °C + 273 = 410 K 
substituting values in the equation
250 mL / 410 K = 425 mL /T2
T2 = 697 K
temperature in Celcius = 697 K - 273 
temperature = 424 °C
3 0
3 years ago
Iodine would have chemical properties most like -
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Iodine would have chemical properties most like H. chlorine.
They would have similar chemical properties because they belong to the same group in the periodic system of elements, unlike manganese, tellurium, and xenon. To see which group these belong to, just look at the periodic system vertically. 

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5. What does the symbol in the picture represent? *
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