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kobusy [5.1K]
3 years ago
6

¿por qué aumenta constantemente la demanda de materiales?

Chemistry
1 answer:
pickupchik [31]3 years ago
4 0
I see the picture can you send it to me
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Which set of terms best defines what affects kinetic energy and potential energy, respectively?
Stolb23 [73]
I’d say velocity and height
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3 years ago
Suppose now that you wanted to determine the density of a small crystal to confirm that it is graphite. From the literature, you
kirza4 [7]

Answer:

The volume of first and second compound are 9.15 ml and 10.85 ml.

Explanation:

Given that,

Density of graphite = 2.25 g/cm³

Volume of mixture = 20.0 mL

Density of first compound = 1.492 g/ml

Density of second compound = 2.890 g/ml

Let the volume of first mixture = x

The volume of second mixture = (20-x)....(I)

We need to calculate the volume of first compound

Using formula of  density of mixture

\rho=\dfrac{V_{1}\rho_{1}+V_{2}\rho_{2}}{V_{1}+V_{2}}

Where, V_{1} = volume of first compound

V_{2} = volume of second compound

\rho_{1} =density of first compound

\rho_{1} = density of first compound

Put the volume into the formula

2.25=\dfrac{x\times1.492+(20-x)\times2.890}{x+20-x}

45=1.492x+57.8-2.890x

45-57.8=1.492x-2.890x

12.8=1.398x

x=\dfrac{12.8}{1.398}

x=9.15\ ml

We need to calculate the volume of second compound

Using equation (I)

V_{2}=20-x

Put the value of x

V_{2}=20-9.15

V_{2}=10.85\ ml

Hence, The volume of first and second compound are 9.15 ml and 10.85 ml.

5 0
3 years ago
How many grams is 5.4x10 to the 23 molecules of al2o3?
8090 [49]

Answer:

91.49 grams

Explanation:

No of molecules = no of moles × Avogadro's number

No of moles = No of molecules / Avogadro's number

Number of moles = 5.4×10^23/6.02×10^23

Number of moles = 0.897 moles of Al2O3

Number of moles = mass in gram / molar mass

Mass in gram = number of moles× molar mass

Mass in gram = 0.897× 102

91.49 grams

5 0
3 years ago
Why is it important for scientists to keep testing a hypothesis even after they've found it to be true?
Alexus [3.1K]

Answer:

as the world is changing we change also

Explanation:

We must always check and recheck are a hypothesis

8 0
3 years ago
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4. Which of the following methods of preserving food keeps food for long without going bad by making bacteria inactive? A. Freez
maw [93]

Answer:

c. because it lacks oxygen which might support life of the bacteria

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2 years ago
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