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4 years ago

Which substance is a heterogeneous mixture

Chemistry

2 answers:

Aleonysh [2.5K]4 years ago

8 0

Answer:

Mixtures in two or more phases are heterogeneous mixtures. Examples include ice cubes in a drink, sand and water, and salt and oil. The liquid that is immiscible form heterogeneous mixtures. A good example is a mixture of oil and water.

Explanation:

Hope this Helped! :D

Anton [14]4 years ago

6 0

Mixtures of sand and water or sand and iron filings, a conglomerate rock, water and oil, a portion salad, trail mix, and concrete (not cement).

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Please help this is due tomorrow, I will give brainliest

Andrews [41]

Answer:

both are chemical changes

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3 years ago

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MaRussiya [10]

Answer:

You need to count all the atoms on each side of the chemical equation. once you know how many of each type of atom you have,you can only change the coefficient. (the numbers in front of the atoms or compounds

7 0

3 years ago

chlorine boils at 239 k. what is the boiling point of chlorine expressed in degrees celsius? a. 93°c b. 34°c c. –61°c d. –34°c

tankabanditka [31]

Answer: Option (d) is the correct answer.

Explanation:

It is given that boiling point of chlorine is 239 K. To convert temperature in degree Celsius, use the formula as follows.

Temperature in Kelvin = Temperature in degree Celsius + 273

or, Temperature in degree Celsius = Temperature in Kelvin - 273

= 239 - 273

= $- 34^{0}C$

Thus, we can conclude that when chlorine boils at 239 K then boiling point of chlorine expressed in degrees Celsius is $- 34^{0}C$ .

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4 years ago

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An imaginary planet was just discovered that has a similar environment to our planet Earth. All the chemistry is similar except

Lena [83]

Answer: $\Delta H_{rxn}=-4652$ kJ/mol

Explanation: In a reaction, a bond of a molecule can break or rearrange itself. When it happens, it absorb or release energy.

Bond Energy is the energy necessary to break or to make a particular bond, producing gaseous fragments at atmospheric temperature. This type of energy can be used to show how stable a compound is or how easy a bond can break.

Enthalpy of Reaction is the energy absorption or release at a constant temperature resulting from a chemical reaction.

To calculate the Enthalpy using bond energy, you have:

1) Write the balanced equation with all the all the reactants and products in gaseous form:

$C_{5}H_{12}_{(g)}+8O_{2}_{(g)}$ ⇒ $5CO_{2}_{(g)}+6H_{2}O_{(g)}$

2) Count each bond of each molecule from both sides, including double or triple bonding, if they exists:

Reactants:

$C_{5}H_{12}$ : 12 C-H

4 C-C

O₂ : 1 O=O

Products:

CO₂ : 2 C=O

H₂O : 2 H-O

3) From the balanced reaction, we there are 8 moles of oxygen gas, 5 moles of carbon dioxide and 6 moles of water, which has to be included when adding each side.

$\Sigma H_{reactants}=$ 12.257 + 4.370 + 8.490 = 8484

$\Sigma H_{products}=$ 5.2.740 + 6.2.478 = 13136

4) Calculate Enthalpy of Reaction by:

$\Delta H_{rxn}= \Sigma H_{reactants}-\Sigma H_{products}$

$\Delta H_{rxn}=8484-13136$

$\Delta H_{rxn}=-4652$

The enthalpy of reaction for the combustion of 1 mole of pentane on a just discovered imaginary planet is an exothermic process of magnitude $\Delta H_{rxn}=$ - 4652kJ/mol

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3 years ago

. H ow many milliliters of water must be added to 250 mL of a 25% w/v stock solu- tion of sodium chloride to prepare a 0.9% w/v

vaieri [72.5K]

The right answer would be

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3 years ago