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alexdok [17]
3 years ago
8

In a double replacement reaction, the ions of two compounds exchange places in an aqueous solution to form two new compounds.

Chemistry
2 answers:
m_a_m_a [10]3 years ago
7 0

Answer:

true

Explanation:

zhuklara [117]3 years ago
5 0

Answer:

True

Explanation:

In a displacement reaction, more reactive element displaces less reactive element. Whereas in a double displacement reaction there is exchange of ions of two compounds.

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What do electrons in the same shell have in common
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Answer:

 They have the same amount of energy. They are all positively charged. They are all made up of atoms.

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Air has weight due to
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mass

Explanation:

How much does air weigh? It might not seem like it, but air has weight. Anything with mass has weight, and we know air has mass because (for example) we can feel it when the wind blows. The total weight of the atmosphere exerts a pressure of about 14.7 pounds per square inch at sea level.

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The answer would be choice B because the energy decreased by 20 J
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4 years ago
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4. The following occurs when heat energy is removed: Gas --A-> Liquid-B--> Solid.
Misha Larkins [42]

Answer: The phase change for A and B respectively is condensation, freezing.

Explanation:

A process in which gaseous state of a substance converts into liquid state is called condensation.

For example, conversion of steam into water.

A process in which liquid state of a substance converts into solid state is called freezing.

For example, conversion of liquid water into ice.

Thus, we can conclude that the phase change for A and B respectively is condensation and freezing.

6 0
3 years ago
What is the ph of a 0.45 m solution of aniline (c6h5nh2)? (pkb  9.40)?
mote1985 [20]

Answer is: pH of aniline is 9.13.<span>
Chemical reaction: C</span>₆H₅NH₂(aq)+ H₂O(l) ⇌ C₆H₅NH₃⁺(aq) + OH⁻(aq).

pKb(C₆H₅NH₂) = 9.40.

Kb(C₆H₅NH₂) = 10∧(-9.4) = 4·10⁻¹⁰.

c₀(C₆H₅NH₂) = 0.45 M.

c(C₆H₅NH₃⁺) = c(OH⁻) = x.

c(C₆H₅NH₂) = 0.45 M - x.

Kb = c(C₆H₅NH₃⁺) · c(OH⁻) / c(C₆H₅NH₂).

4·10⁻¹⁰ = x² /  (0.45 M - x). 

Solve quadratic equation: x = c(OH⁻) = 0.0000134 M.

pOH = -log(0.0000134 M.) = 4.87.

pH = 14 - 4.87 = 9.13.

7 0
4 years ago
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