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marshall27 [118]
3 years ago
8

If you bang on a large metal gong with a stick, producing a loud sound that can be heard by your friend down the street, how doe

s this sound travel to your friend’s ear?
Banging the gong sets the metal particles in motion, these particles move through the air to your friend’s ear.

Banging the gong releases sound particles that travel as vibrations through the air to your friend’s ear.

Banging the gong vibrates the metal, which passes its energy to the air, sending a sound wave through the air to your friend’s ear.

Banging the gong creates air particles; these particles vibrate. Their energy travels through the air to your friend’s ear, but the air particles themselves do not move.
Chemistry
1 answer:
Gennadij [26K]3 years ago
3 0

Answer:

c

Explanation:

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Sodium-25 was to be used in an experiment, but it took 3.0 minutes to get the sodium from the reactor to the laboratory. If 8.0
Ksenya-84 [330]

Sodium-25 after 3 minutes : 1.0625 mg

<h3>Further explanation</h3>

General formulas used in decay:  

\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

<h3 />

No=8 mg

t1/2=60 s

T=3 min=180 s

\tt Nt=No\dfrac{1}{2}^{T/t1/2}\\\\Nt=8.5\dfrac{1}{2}^{180/60}\\\\Nt=8.5(\dfrac{1}{2})^3\\\\Nt=1.0625~mg

5 0
3 years ago
H+(aq) + OH–(aq) → H2O(l) + 55.8 kJ In this reaction there is conservation of
pentagon [3]
In the equation given above, there is conservation of MASS, CHARGE AND ENERGY.
These three parameters are usually conserved during the course of chemical reactions. When any of these parameter experience a reduction during the course of chemical reaction, such loss is always gained by other elements involved in the same reaction, so that at the end of the day, they are not considered as lost. 
4 0
4 years ago
How many grams are present in a sample of aluminum?
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5 0
4 years ago
. A container with a volume of 0.50 L contains air at a pressure of 1.0 atm. If the volume is reduced to 0.10 L at constant temp
marin [14]

Answer:

The answer to your question is Pressure = 5 atm

Explanation:

Data

Volume 1 = V1 = 0.5 l

Pressure 1 = P1 = 1 atm

Volume 2 = V2 = 0.1 l

Pressure 2 = P2 = x

Formula

To solve this problem use the Boyle's equation

                      V1P1 = V2P2

Solve for P2

                     P2 = V1P1/V2

Substitution

                     P2 = (0.5 x 1) / 0.1

Simplification

                     P2 = 0.5/0.1

Result

                     P2 = 5 atm          

3 0
3 years ago
A new penny has a mass of 2.49 g and a volume of 0.349cm3. The density of copper is 8.94 g/mLA)Is the penny made of pure copper?
yawa3891 [41]

Answer:

Zinc metal might be mixed with the copper.

Explanation:

Density is defined as mass of the substance present in the unit volume of the substance.

Mass=\frac{Mass}{Volume}

Density of pure copper = d = 8.94 g/mL = 8.94 g/cm^3

1 mL = 1 cm^3

Mass of the copper penny = M = 2.49 g

Volume of the copper penny = V = 0.349 cm^3

Density of the copper penny = d

d=\frac{M}{V}=\frac{2.49 g}{0.349 cm^3}=7.135 g/cm^3

Density of pure copper > Density of zinc > Density of penny

8.94 g/cm^3>7.14 g/cm^3>7.135 g/cm^3

The metal mixed with copper is zinc to make a penny . This is so because all the other metal given have higher value of density which will increase the density of the copper penny if they were present.

But here the density of the copper penny is smaller than density of pure copper which means that less denser metal than copper is also added in the penny.

3 0
3 years ago
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