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Crank
3 years ago
9

mixture or pure substance: 1.blood 2.dyes 3.self-raising flour 4.muesli 5.copper wire 6.distilled water 7.table salt 8.milk 9.br

onze 10.tea 11.oxygen 12.air
Chemistry
1 answer:
jenyasd209 [6]3 years ago
5 0

Answer: Mixture: Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance: Copper wire, distilled water, table salt, oxygen.

Explanation:

Mixture is a substance which is made up two or more number of compounds which chemically inactive and retain their distinct chemical properties.

Blood , Self raising flour,muesli ,dyes, milk, tea, air, bronze

Pure substance is defined as anything with uniform and unchanging composition is known s pure substance.

Copper wire, distilled water, table salt, oxygen.

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3 years ago
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In the balanced equation, 4KO2 + 2CO2 = 2K2CO3 + 3O2 which two chemicals have a molar ratio of 3:4?
Sveta_85 [38]

 4KO₂  + 2CO₂  →    2K₂CO₃  + 3 O₂

The two  chemicals  that  have a  molar ratio  of 3:4   is  in equation above O₂   and KO₂

<em><u>explanation</u></em>

The molar ratio  is the ratio  between  the amount in moles  of two  compounds  that are involved  in a chemical reaction.

In the  equation above the mole  ratio  is determined  by examining coefficient ( <em>number in front of the formula</em>)


the coefficient of O₂  is 3 while that of KO₂ is 4  therefore the  mole ratio of O₂:KO₂  is 3:4


3 0
3 years ago
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Carbon dioxide, when it is at -145 degreesC has a density of 2.54 g/L. What is the pressure in torr??
Black_prince [1.1K]

Answer: The pressure in torr is 461 torr

Explanation:

To calculate the relation of density and molar mass of a compound, we use the ideal gas equation:

PV=nRT

P = pressure

V = Volume

n = number of moles

R = gas constant = 0.0821 Latm/Kmol

T = temperature =-145^0C=(273-145)K=128K

Number of moles (n) can be written as:

n=\frac{m}{M}

where, m = given mass

M = molar mass  = 44 g/mol

PV=\frac{m}{M}RT\\\\PM=\frac{m}{V}RT

where,

\frac{m}{V}=d

where d = density = 2.54 g/L

The relation becomes:

PM=dRT  

P=\frac{dRT}{M}

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5 0
3 years ago
TIMED HELP PLSPLS ASAP UNDER 5 MIN REMAINING
uysha [10]

Answer:

3.98×10⁻¹⁹ J

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I would say false because a precipitate is a solid.
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