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zysi [14]
3 years ago
13

You find two containers on a chemical shelf, one labeled Cu2O(s) and a second labeled CuO(s). Are these substances the same or d

ifferent explain.
Chemistry
1 answer:
mylen [45]3 years ago
6 0

Given :

Two chemicals Cu_2O(s) and CuO(s) .

To Find :

Are these substances same or different explain.

Solution :

It might seem that the difference is none because the atoms used in the molecules are same but in different proportion .

But , their is a lot of difference between them .

The change in configuration impacts a lot in physical as well as chemical properties .

For ex :

Cu_2O is red powder while CuO is black powder .

Cu_2O is fungicide while CuO is used in batteries .

Hence , this the required solution .

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A tank contains 90 kg of salt and 2000 L of water. Pure water enters a tank at the rate 6 L/min. The solution is mixed and drain
sashaice [31]

Answer:

a) 90 kg

b) 68.4 kg

c) 0 kg/L

Explanation:

Mass balance:

-w=\frac{dm}{dt}

w is the mass flow

m is the mass of salt

-v*C=\frac{dm}{dt}

v is the volume flow

C is the concentration

C=\frac{m}{V+(6-3)*L/min*t}

-v*\frac{m}{V+(6-3)*L/min*t}=\frac{dm}{dt}

-3*L/min*\frac{m}{2000L+(3)*L/min*t}=\frac{dm}{dt}

-3*L/min*\frac{dt}{2000L+(3)*L/min*t}=\frac{dm}{m}

-3*L/min*\int_{0}^{t}\frac{dt}{2000L+(3)*L/min*t}=\int_{90kg}^{m}\frac{dm}{m}

-[ln(2000L+3*L/min*t)-ln(2000L)]=ln(m)-ln(90kg)

-ln[(2000L+3*L/min*t)/2000L]=ln(m/90kg)

m=90kg*[2000L/(2000L+3*L/min*t)]

a) Initially: t=0

m=90kg*[2000L/(2000L+3*L/min*0)]=90kg

b) t=210 min (3.5 hr)

m=90kg*[2000L/(2000L+3*L/min*210min)]=68.4kg

c) If time trends to infinity the  division trends to 0 and, therefore, m trends to 0. So, the concentration at infinit time is 0 kg/L.

6 0
3 years ago
Given a gas with an initial volume of 3.0 L and a temperature of 290 K, what is the final volume if the
statuscvo [17]

Answer:

2.8l

Explanation:

just make v2 de subject

6 0
2 years ago
Matt is conducting an experiment where he compares the properties of water and
NikAS [45]

Answer:

sitric acid from lemon

Explanation:

there

3 0
3 years ago
SOMEONE HELP PLEASE !!
aev [14]

salt is not because it gets u dehydrated

6 0
2 years ago
Explain why water is polar. Check all that apply. View Available Hint(s) Water is known as a polar molecule because Check all th
sineoko [7]

Answer:

The correct statements that you must check are:

  • The oxygen atom has a greater attraction for electrons than the hydrogen atom does (second statement).

  • The electrons of the covalent bond are not shared equally between the hydrogen and oxygen atoms (fourth statement).

Explanation:

Electronegativity is the relative ability of an atom to pull the electrons in a covalent bond.

Hydrogen has an electronegativity of 2.20 and oxygen has 3.44. That means that oxygen attracts the electrons more strongly than hydrogen does (second statement).

As consequence, the electrons in the covalent bond H - O of water are not shared equally (fourth statement): the electron density will  be higher around the O atoms.

Of course, this discards the statement telling that hydrogen atom attracts electrons much more strongly than the oxygen atom, and the statement telling that hydrogen and oxigen have same electronegativity.

Such difference in electron densities creates a dipole moment, so you discard the last statement (that the water dipole moment is equal to zero).

7 0
3 years ago
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