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3 years ago

Read the following, and answer the questions below. Remember to read the question carefully.

Chemistry

1 answer:

andreev551 [17]3 years ago

8 0

<h3>Question #1:</h3>

False.

Melting is a type of chemical change.

<h3>Question #2:</h3>

True.

If the substance's atoms change in any way, it is a chemical change.

<h3>Question #3:</h3>

True.

If a substance is broken or torn, it's still the same substance. (Take tearing paper, for example)

<h3>Question #4:</h3>

False.

Take boiling water for example, when you boil water, it is still water, right?

<h3>Question #5:</h3>

False.

<em><u>Every</u></em> chemical or physical change in matter includes change in energy. <u><em>Not most.</em></u>

<h3>Question #6</h3>

True.

Hydrogen peroxide (H2O2), has turned into water (H2O) and oxygen (O). The substance has change chemically, therefore it is an chemical change.

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I hoped this helps! If you have any questions, feel free to ask! ^^

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In which group of the periodic table do you find alkali metals?<br><br>A. 8A<br>B.2A<br>C.1A<br>D.7A

SOVA2 [1]

c, 1A hope this helps

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3 years ago

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When 35.0 mL of 0.400 M hydrobromic acid and 35.0 mL of 0.400 M ammonia are combined, the pH of the resulting solution will be :

Kay [80]

Answer:

B. Equal to 7.

Explanation:

Hydrobromic acid is a strong acid that decreases pH and ammonia is a strong base that increases pH.

As the initial pH of water is 7,0 the addition of 35.0mL of 0.400M HBr will produce a pH less than 7,0. But, the same effect of decreasing pH is reverted for the addition of 35.0mL of 0.400M HNO3.

That means the net effect of the two addition is to have a pH:

B. Equal to 7.

I hope it helps!

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2 years ago

Write the Henderson-Hasselbalch equation for a solution of formic acid. Calculate the quotient [HCO2]/[HCO2H] at (a) pH 3.000; (

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Answer:

a. 0.182

b. 1.009

c. 1.819

Explanation:

Henderson-Hasselbach equation is:

pH = pKa + log [salt / acid]

Let's replace the formula by the given values.

a. 3 = 3.74 + log [salt / acid]

3 - 3.74 = log [salt / acid]

-0.74 = log [salt / acid]

10⁻⁰'⁷⁴ = 0.182

b. 3.744 = 3.74 + log [salt / acid]

3.744 - 3.74 = log [salt / acid]

0.004 = log [salt / acid]

10⁰'⁰⁰⁴ = 1.009

c. 4 = 3.74 + log [salt / acid]

4 - 3.74 = log [salt / acid]

0.26 = log [salt / acid]

10⁰'²⁶ = 1.819

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3 years ago

Energy in Devices. An engineer needs to design a device that transforms light energy into sound energy. Describe a design for a

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Answer:

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Explanation:

Sound energy is created by vibrating particles of medium that propagates as a wave. So in order to convert light (electromagnetic wave) to sound wave it has to be converted into electric or magnetic signals. Then these signals can be converted into sound waves.

However, if you consider the particle nature of light. It contains momentum and after collision sets the other particles into oscillatory motion but the wavelength of these vibrations is too high to be considered as sound waves.

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3 years ago

What do u need to know to describe the velocity of an object?

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To determine the velocity of an object, you need to know the displacement and the change in time.

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2 years ago

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