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3 years ago

If a substance can be physically separated into its components, is it a pure substance or a mixture?

2 answers:

5 0

It is a mixture .
A substance that can be physically separated into its compounds first need to get decomposed to get separated and is called a mixture...

100%sure answer...

HOPE IT HELPS YOU '_'

Marizza181 [45]3 years ago

4 0

I think its pure substance since you are breaking into its components. For example if you were to break the components of salt apart (NaCl) You will be left with sodium and chloride which are the pure elements of salt. Therefore i believe pure is the best answer.

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A light particle has the wavelength of 426.2 nm. what is the wavelength in meters

babymother [125]

Answer:

0.0000004262m

Explanation:

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3 years ago

An element's group number tells you how many _________________ _________________ the element has.

SSSSS [86.1K]

Answer: An element's group number tells you how many valence electrons the element has.

Explanation:

In the periodic table, each element is placed in a specific location because of its atomic structure.

The elements are arranged in rows, called a period. All of the elements in a period have the same number of atomic orbitals.

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3 years ago

What is the oxidation number of the chromium atom in Li2Cr2O7?

DanielleElmas [232]

I believe the answer is 2

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4 years ago

Which of the following descriptions of the storage requirements for alkali metals is the most accurate? Select the correct answe

elena55 [62]

Answer:

A. They must be kept separate from moisture and oxygen

Explanation:

Alkali metals refers to a group of chemical elements in the periodic table. It is the common name given to Group 1 elements (excluding hydrogen). They are generally metallic in nature with physical properties like shining lustre, silvery in appearance etc. Alkali metals include lithium, Pottasium, Sodium, Rubidium etc.

One important chemical property of alkali metals is their high reactivity i.e. they tend to react quickly with other substances. For example, alkali metals react vigorously with water to form hydroxides. They also react with oxygen to form oxides. Due to this highly reactive properties, they are kept or stored away from moisture (water) and oxygen (present in air).

7 0

3 years ago

What is the molality of a solution prepared by dissolving 75.8 g of ethylene glycol, HOCH2CH2OH, in 1.55 L of water? Assume the

GaryK [48]

Answer:

0.787 mol.Kg⁻¹ or 0.787 m

Explanation:

Data Given:

Mass = m = 75.8 g

Volume = V = 1.55 L = 1550 mL

M.Mass of Ethylene Glycol = 62.07 g/mol

Density of water = d = 1.0 g/mL

To Find:

Molality = <u>??</u>

Molality is a unit of concentration and is defined as the number of moles of solute per Kg of a solvent.

Molality = Moles of Solute / Kg of Solvent --- (1)

First Calculate Moles of Solute as;

Moles = Mass / M.Mass

Moles = 75.8 g / 62.07 g/mol

Moles = 1.22 moles

Secondly calculate mass of water as,

mass of water = density × volume

mass of water = 1.0 g/mL × 1550 mL

mass of water = 1550 g or 1.55 Kg

Now, putting values of moles and mass of solvent in equation 1,

Molality = 1.22 mol / 1.55 Kg

Molality = 0.787 mol.Kg⁻¹ or 0.787 m

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3 years ago