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3 years ago

Is air homogeneous or heterogeneous?

2 answers:

8 0

Answer: yes, Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances. Salt, sugar, and substances dissolve in water to form homogeneous mixtures. A homogeneous mixture in which there is both a solute and solvent present is also a solution

Explanation:

Mademuasel [1]3 years ago

6 0

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Explanation:

a mixture is a material made up of two or more different Chemical substance/substances which are not chemically combined.A mixture is the physical combination of two or more substances in which the identities are retained and are mixed in the form of solutions, suspensions and colloids.Mixtures are one product of mechanically blending or mixing chemical substances such as elements and compounds, without chemical bonding or other chemical change, so that each ingredient substance retains its own chemical properties and makeup. Despite the fact that there are no chemical changes to its constituents, the physical properties of a mixture, such as its melting point, may differ from those of the components. Some mixtures can be separated into their components by using physical means. Azeotropes are one kind of mixture that usually poses considerable difficulties regarding the separation processes required to obtain their constituents

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Phenolphthalein indicator is??

Aleonysh [2.5K]

Answer:

Hey mate.....

Explanation:

This is ur answer.....

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions. It belongs to the class of dyes known as phthalein dyes.

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3 years ago

True or False:

Juli2301 [7.4K]

Answer:

Explanation:

From the work of Krogh in 1918 until the present time, a very wide range of values for oxygen diffusion coefficients has been reported1–5 ranging from 1.1 × 10−4 to 4 × 10−8 cm2 sec−1.

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3 years ago

Calculate the mass of magnesium oxide produced when 0.645 g of magnesium hydroxide is the is completely decomposed.

FrozenT [24]

Answer:

0.44g

Explanation:

Given parameters:

Mass of magnesium hydroxide = 0.645g

Solution

The balanced reaction equation is shown below:

Mg(OH)₂ → MgO + H₂O

From the equation above, we see that the number of atoms are conserved.

To find the mass of magnesium oxide produced, we find the number moles of the decomposed magnesium hydroxide first:

Molar mass of Mg(OH)₂ = 24 + 2(16+1) = 58g/mol

Number of moles of Mg(OH)₂ = $\frac{mass}{molar mass}$

= $\frac{0.645}{58}$

= 0.011mole

Now, from the balanced equaiton, we know that:

1 mole of Mg(OH)₂ produces 1 mole of MgO

Therefore, 0.011mole of Mg(OH)₂ will produce 0.011mole of MgO

so mass of MgO = number of moles of MgO x molar mass of MgO

Molar mass of MgO = 24 + 16 = 40g/mol

mass of MgO = 0.011 x 40 = 0.44g

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4 years ago

What causes valley air to move up surrounding mountains during the day?

AleksandrR [38]

Answer:

so the third one

Explanation:

During the day, the sun heats up mountain air rapidly while the valley remains relatively cooler. Convection causes it to rise, causing a valley breeze. At night, the process is reversed. During the night the slopes get cooled and the dense air descends into the valley as the mountain wind.

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3 years ago

Read 2 more answers

You have two samples of the same gas in the same size container, with the same pressure. The gas in the first container has a Ke

vodomira [7]

PV=nRT Since P, V and R are constant, when T goes up, n must go down by the same factor 1:4

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4 years ago