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3 years ago

How is a pure substance different from a mixture? A. pure substances cannot be seperated by physical means.

Chemistry

2 answers:

Firdavs [7]3 years ago

7 0

Answer:

How is a mixture different from a pure substance?

Mixtures can be separated by physical means.

Explanation:

jeyben [28]3 years ago

6 0

Answer: Pure substances cannot be separated by physical means.

Explanation:

A pure substance is a substance which contains definite composition of only one type of component. Hence, it cannot be separated by physical means.

On the other hand, a mixture is a substance which contains two or more than two types of components and they can be separated by physical means as well.

Thus, option (a) is correct one that is pure substances cannot be separated by physical means.

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When liquid gold becomes a solid, its particles get closer together. Which best describes what happened to the gold?

yanalaym [24]

Answer:

The rearrangement of particles in a physical change.

Explanation:

When things are liquid the particles tend to be spread out because they aren't tightly compacted as they would be with a solid. So when liquid gold is changing from a liquid to a solid the properties are changing and the particles in the gold are getting closer together.

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3 years ago

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1. The picture above shows salt (NaCl).

Gwar [14]

Answer: A Chloride is attracted to the hydrogen atoms in a water molecule.

Explanation: Salt dissociates in water because Chlorine which is an anion gets attracted to the positively charged atoms of Hydrogen in water. This attraction causes Cl to bind with Hydrogen allowing Na to be left behind.

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3 years ago

Calculate each of the following quantities:

morpeh [17]

Amount (mol) of solute in 145.6 L of 0.850 M sodium cyanide

<h3>What is molarity?</h3>

Molar concentration (also known as molarity, quantity concentration, or substance concentration) is a measure of the concentration of a chemical species in a solution, specifically of a solute, in terms of amount of substance per unit volume of solution. The most often used unit for molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units. A solution with a concentration of 1 mol/L is referred to as 1 molar, or 1 M.

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2 years ago

Which statement is not included in John Dalton's modern theory of the atom?

Harman [31]

Answer:

atoms of different elements combine and form new elements

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3 years ago

Which of the following combinations of quantum numbers is permissible?Question 23 options: n = 1, l = 2, ml = 0, ms = n = 4, l =

frosja888 [35]

Answer: n= 4, , l= 3, $m_l$ = 1, permissible

Explanation:

Principle Quantum Numbers : It describes the size of the orbital and the energy level. It is represented by n. Where, n = 1,2,3,4....

Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1).For l = 0,1,2,3... the orbitals are s, p, d, f...

Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as $m_l$ . The value of this quantum number ranges from $(-l\text{ to }+l).$

Spin Quantum number : It describes the direction of electron spin. This is represented as $m_s$ . The value of this is $+\frac{1}{2}$ for upward spin and $-\frac{1}{2}$ for downward spin.

a) n=1 , l= 2, $m_l$ = 0, not permissible as l can not greater than n.

b) n= 4, , l= 3, $m_l$ = 1, permissible

c) n= 3, l= 3, $m_l$ = 1, not permissible as l can not equal than n.

d) n= 4 , l= 3, $m_l$ = 4, not permissible as $m_l$ can not greater than l.

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3 years ago