3 years ago

While out on a hike, you find an unknown mineral. How would you test the mineral to find out what it is?

Chemistry

1 answer:

notsponge [240]3 years ago

6 0

Are there answer choices or is it just right it your self?

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11 The cross section compares the densities of different Earth layers. Which Earth layer is most dense?

Naily [24]

Answer:

Explanation:

i took the quiz

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2 years ago

The lattice energy of a salt is related to the energy required to separate the ions. For which of the following pairs of ions is

kati45 [8]

Answer:

(A) Mg²⁺ and O²⁻

Explanation:

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2 years ago

Acidic substances will taste _____

choli [55]

Answer:False, we can sense four tastes, namely salty, sweet, sour and bitter. Acids taste sour. If we want to know if something is an acid, we can just taste it.

Explanation:

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3 years ago

An ideal gas sealed in a rigid 4.86-L cylinder, initially at pressure Pi=10.90 atm, is cooled until the pressure in the cylinder

seraphim [82]

Answer:

$\Delta H=-11897J$

Explanation:

Hello,

In this case, it is widely known that for isochoric processes, the change in the enthalpy is computed by:

$\Delta H=\Delta U+V\Delta P$

Whereas the change in the internal energy is computed by:

$\Delta U=nCv\Delta T$

So we compute the initial and final temperatures for one mole of the ideal gas:

$T_1= \frac{P_1V}{nR}=\frac{10.90atm*4.86L}{0.082*n}=\frac{646.02K }{n} \\\\T_2= \frac{P_2V}{nR}=\frac{1.24atm*4.86L}{0.082*n}=\frac{73.49K }{n}$

Next, the change in the internal energy, since the volume-constant specific heat could be assumed as ³/₂R:

$\Delta U=1mol*\frac{3}{2} (8.314\frac{J}{mol*K} )*(73.49K-646.02K )=-7140J$

Then, the volume-pressure product in Joules:

$V\Delta P=4.86L*\frac{1m^3}{1000L} *(1.24atm-10.90atm)*\frac{101325Pa}{1atm} \\\\V\Delta P=-4756.96J$

Finally, the change in the enthalpy for the process:

$\Delta H=-7140J-4757J\\\\\Delta H=-11897J$

Best regards.

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3 years ago

How is the molarity affected if some solution splashes out of the flask during titration?

Jobisdone [24]

Answer:

not affected?

Explanation:

pretty sure M / concentration isn't affected, only volume.

5 0

2 years ago