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2 years ago

What is the density of 19.2 g of oak that has a volume of 25.7 cm3?

Chemistry

1 answer:

andreyandreev [35.5K]2 years ago

7 0

Density = Mass/Volume

19.2/25.7

= 0.747 or 0.75

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Magicians often use ‘flash powder’ in their acts. Flash powder contains 69.0% potassium chlorate (31.9% K, 28.9% Cl, 39.2% O) an

mafiozo [28]

Answer:

$\rm K$ : approximately $22.0\%$ .

$\rm Cl$ : approximately $19.9\%$ .

$\rm O$ : approximately $27.0\%$ .

$\rm Al$ : $31.0\%$ .

Explanation:

Consider a $100\; \rm g$ sample. There would be $69.0\% \times 100\; \rm g = 69.0\; \rm g$ of $\rm KClO_{3}$ and $100.0\; \rm g - 69.0\; \rm g = 31.0\; \rm g$ of $\rm Al$ .

Out of that $69.0\; \rm g$ of $\rm KClO_{3}$ :

$31.9\%$ (by mass) would be $\rm K$ : $31.9\% \times 69.0\; \rm g \approx 22.0\; \rm g$ .

$28.9\%$ (by mass) would be $\rm Cl$ : $28.9\% \times 69.0\; \rm g \approx 19.9\; \rm g$ .

$39.2\%$ (by mass) would be $\rm O$ : $39.2\% \times 69.0\; \rm g \approx 27.0\; \rm g$ .

Overall, the composition (by mass) of each element in this mixture would be:

$\rm K$ :

$\begin{aligned} & \frac{31.9\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 31.9\% \times 69.0\% \\ \approx \; & 22.0\%\end{aligned}$ .

$\rm Cl$ :

$\begin{aligned} & \frac{28.9\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 28.9\% \times 69.0\% \\ \approx \; & 19.9\%\end{aligned}$ .

$\rm O$ :

$\begin{aligned} & \frac{39.2\% \times 69.0\; \rm g}{100\; \rm g} \\ =\; & 39.2\% \times 69.0\% \\ \approx \; & 27.0\%\end{aligned}$ .

$\rm Al$ :

$\begin{aligned}& \frac{100\; \rm g - 69.0\; \rm g}{100\; \rm g} \\ =\; & 100\% - 69.0\% \\ =\; & 31.0\%\end{aligned}$ .

7 0

2 years ago

Illustrating Mechanical Waves

maria [59]

Transverse wave:

⇨- the way the wave is moving

⟶- Medium - the material it is traveling through

冖- Wavelength - the distance from crest to crest

C - Crest - the highest point on a wave

T - trough - the lowest part on a wave

↕️ - Amplitude - the distance from rest to crest

ྊ - (tinfoil)Wave

Description:

In the beginning of the wave the wavelength is short and the frequency is high so is the energy.and the amplitude is low *i believe* And after the mark of T shown on the image the wavelength is long and the frequency is low and so is the energy and the amplitude is high *i believe*.Amplitude and wavelength are both measures of distance.

Longitudinal/Compressional Wave:

KEYS:

⟶-medium - the material it is traveling through

⇨-way the wave is moving

冖-wavelength - the distance from crest to crest

R -Rarefaction - the opposite of compression

C-Compression - particles are closest together

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2 years ago

Wich of the following is an example of a cottonwood tree maintaining homeostasis

aleksley [76]

The answer I believe would be A

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Answer:

vcbcbcvccbncvcvvb

Explanation:

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1 year ago

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What is the formula for an ionic compound that forms out of Sr and Br?

lesantik [10]

Answer: St Br2

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2 years ago