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4 years ago

Why should you never mix unknown chemicals?

Chemistry

1 answer:

Zolol [24]4 years ago

5 0

Because it could blow up you or your house or melt everything.

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An aluminum cup of 140 cm3 capacity is completely filled with glycerin at 20°C. How much glycerin will spill out of the cup if t

mel-nik [20]

Explanation:

The given data is as follows.

coefficient of volume expansion of glycerin ( $\beta$ ) = $5.1 \times 10^{-4} 1/^{o}C$

linear expansion coefficient of aluminum, $(\alpha_{A})$ = $23 \times 10^{-6} 1/^{o}C$

Volume = 100 $cm^{3}$

The increase in volume of the cup will be calculated as follows.

$\Delta V_{c} = V \times 3 \times \alpha \times \Delta T$

= $100 cm^{3} \times 3 \times 23 \times 10^{-6} \times (31 - 20)^{o}C$

= $75900 \times 10^{-6} cm^{3}$

= 0.0759 $cm^{3}$

Formula for increase in volume of glycerine is as follows.

$\Delta V_{g} = V \times \beta_{g} \times \Delta T$

= $100 cm^{3} \times 5.1 \times 10^{-4} 1/^{o}C \times (31 - 20)^{o}C$

= 0.5610 $cm^{3}$

Therefore, volume of glycerin spilled is calculated as follows.

$\Delta V = \Delta V_{g} - \Delta V_{c}$

= (0.5610 - 0.0759) $cm^{3}$

= 0.4851 $cm^{3}$

Thus, we can conclude that 0.4851 $cm^{3}$ glycerin will spill out of the cup.

6 0

3 years ago

Why must ionic compound have a total charge of 0?

Neko [114]

Iconic compound consists of equal number of positive and negative ions so the charge of icon compound is zero.

Good luck and please can I have brainless because this is a new account and my other one had like 10

5 0

3 years ago

Scientists believe the Earth’s core is around 6,000 degrees Celsius. Where does this heat come from?

Nataliya [291]

The heat in the core of the Earth has several sources including:
1- The heat produced from the decaying of radioactive elements
2- The heat that was originally produced during the formation and accretion of the planet itself (This heat has not yet faded)
3- The heat produced during friction when denser material and elements sink into the planet's center.

8 0

3 years ago

A silver nitrate, AgNO3, solution of unknown concentration was discovered in the lab. To determine the concentration of the solu

harina [27]

Answer:

0.174 M

Explanation:

The same can be solve by using Nernst's equation

The Nernst's equation is:

$Ecell=E^{0}_{cell}-\frac{0.0592}{n}log\frac{[anodic]}{[cathodic]}$

For silver cell

n= 1

As both the compartments have silver nitrate solution,t the standard emf of cell will be zero.

Given

Ecell = 0.045

[Anodic compartment]= 1 M

Putting values

$0.045 = 0 -\frac{0.0592}{1}log(\frac{1}{x} )$

$0.760=log(\frac{1}{x})$

Taking antilog and solving

[AgNO3]=0.174 M

3 0

4 years ago

Please help bestossss

Yuki888 [10]

Answer:

it's option A.

cell, tissue, organ, system

3 0

3 years ago