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3 years ago

Is it is a broken window a physical change or chemical change?

1 answer:

iogann1982 [59]3 years ago

3 0

Breaking glass is an example of a physical change because if you break it, it is still glass. It didn't change to another substance.

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Compare and contrast an element and a compound. PLZ HELP ITS DUE TOMORROW!!

hjlf

Answer:

Explanation:

The answer is that "elements are a single atom and compounds are a mixture of two elements or more." Elements are atoms that have protons, neutrons, and electrons. Compounds are mixtures with two or more elements.

Hope this helps.

7 0

3 years ago

Calculate the osmotic pressure (in torr) of 6.00 L of an aqueous 0.958 M solution at 30.°C, if the solute concerned is totally i

cluponka [151]

Answer: The osmotic pressure is 54307.94 Torr.

Explanation:

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

$\pi=iCRT$

where,

$\pi$ = osmotic pressure of the solution = ?

i = Van't hoff factor = 3

C = concentration of solute = 0.958 M

R = Gas constant = $62.364\text{ L Torr }mol^{-1}K^{-1}$

T = temperature of the solution = $30^oC=[30+273]K=303K$

Putting values in above equation, we get:

$\pi=3\times 0.958mol/L\times 62.364\text{ L. Torr }mol^{-1}K^{-1}\times 303K\\\\\pi=54307.94Torr$

Hence, the osmotic pressure is 54307.94 Torr.

7 0

3 years ago

What element is oxidized in the chemical reaction 2Mn(NO3)2 + 5NaBiO3 + 16HNO3 → 2HMnO4 + 5Bi(NO3)3 + 5NaNO3 + 7H2O

Lena [83]

I’m not sure lol good luck

5 0

2 years ago

If 1 mile = 5,280ft. how many miles are in 11,245ft

slavikrds [6]

2.13 miles

You can also check it on google

3 0

3 years ago

12 = 3X X = 7X = 57 X = 11X = 27.7 X =

dybincka [34]

Answer:
1. $x=4$
2. $x=\frac{57}{7}$
3. $x=\frac{27.7}{11}$

Explanation:

Given the following questions:

$12=3x$
$7x=57$
$11x=27.7$

In order to find the answers to these questions, we have to recognize that in order to isolate the variable we need to divide on both sides.

Question one:
$12=3x$
$\frac{3x}{3} =\div3$
$12\div3=4$
$x=4$

Question two:
$7x=57$
$\frac{7x}{7} =\div7$
$57\div7=8.14285714=\frac{57}{7}$
$x=\frac{57}{7}$

Question three:
$11x=27.7$
$\frac{11x}{11} \div11$
$27.7\div11=2.51818182=\frac{27.7}{11}$
$x=\frac{27.7}{11}$

Hope this helps.

3 0

2 years ago