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andrew-mc [135]
3 years ago
14

How does matter change? *1 point by timewatertemperature​

Chemistry
1 answer:
Stella [2.4K]3 years ago
4 0

Answer: Matter changes state when energy is added or taken away. Most matter changes because of heat energy. Changes in pressure can change matter, too.

Explanation:

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When acetic acid reacts with ammonia, NH3, the reaction yields ________.
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Answer:

Acetamide

Explanation:

The reaction can be expressed as:

CH₃COOH + NH₃ → CH₃CONH₂ + H₂O

It's worth mentioning that this reaction would have a better yield if we use an appropiate catalyst such as DCC, in order to prevent an acid-base reaction and instead have the previous <em>amidation</em> reaction.

4 0
3 years ago
Reactions that absorb thermal energy are called blank reactions
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Endothermic reactions
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The Following questions pertain to a 2.2M solution of hydrocyanic acid at 25°C. pKa = 9.21 at 25°C. Find the concentrations of a
horsena [70]
1) Chemical reaction: HCN + H₂O → CN⁻ + H₃O⁺.
c(HCN) = 2,2 M = 2,2 mol/L.
pKa(HCN) = 9,21.
Ka = 6,16·10⁻¹⁰.
[CN⁻] = [H₃O⁺] = x.
[HCN<span>] = 2,2 M - x.
</span>Ka = [CN⁻] · [H₃O⁺] / [HCN].
6,16·10⁻¹⁰ = x² / 2,2 M -x.
Solve quadratic equation: [CN⁻] = [H₃O⁺] = 0,0000346 M.
[HCN] = 2,2 M - 0,0000346 M = 2,199 M.

2) pH = - log[H₃O⁺].
pH = -log( 0,0000346 M).
pH = 4,46.
Hydrocyanic acid and hydronium ion (H₃O⁺) are acids. Cyanide anion (CN⁻) is the strongest base in the system, cyanide anion accept protons in chemical reaction.
pKb = pKw - pKa.
pKb = 14 - 9,21 = 4,79.

6 0
3 years ago
A solid and a liquid are shaken together in a test tube to produce a clear blue liquid. Which of the following best describes th
harkovskaia [24]
<span>the behavior of the above pair of substances</span> is soluble

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3 years ago
What is the difference between genotypes and phenotypes?​
kaheart [24]

Answer:

Genotypes are the genetic composition of an organism. Phenotype is the physical composition of an organism.

Explanation:

3 0
3 years ago
Read 2 more answers
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