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Helen [10]
3 years ago
8

What do you know about a substance it you know its temperature? A.How heavy the substance is B.How large or small the particles

of the substance are C.How many particles are in the substance D.How hot or cold the substance is
Chemistry
2 answers:
Softa [21]3 years ago
4 0

Answer:

C. how many particles are in the substance

Hitman42 [59]3 years ago
3 0

Answer:

it is how hot or cold so bassically c in my test

Explanation:

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A first-order reaction is 45% complete at the end of 43 minutes. What is the length of the half-life of this reaction
shtirl [24]

The half-life of the reaction is 50 minutes

Data;

  • Time = 43 minutes
  • Type of reaction = first order
  • Amount of Completion = 45%

<h3>Reaction Constant</h3>

Let the initial concentration of the reaction be X_0

The reactant left = (1 - 0.45) X_0 = 0.55 X_0 = X

For a first order reaction

\ln(\frac{x}{x_o}) = -kt\\ k = \frac{1}{t}\ln (\frac{x_o}{x}) \\ k = \frac{1}{43}\ln (\frac{x_o}{0.55_o})\\ k = 0.013903 min^-^1

<h3>Half Life </h3>

The half-life of a reaction is said to be the time required for the initial amount of the reactant to reach half it's original size.

x = \frac{x_o}{2} \\t = t_\frac{1}{2} \\t_\frac{1}{2} = \frac{1}{k}\ln(\frac{x_o}{x_o/2})\\

Substitute the values

t_\frac{1}{2} = \frac{1}{k}\ln(2)=\frac{0.6931}{0.013903}\\t_\frac{1}{2}= 49.85 min = 50 min

The half-life of the reaction is 50 minutes

Learn more on half-life of a first order reaction here;

brainly.com/question/14936355

4 0
2 years ago
11. What is the mass number
solniwko [45]

Answer:The mass numbr is 22

Explanation:

Mass number=number of protons+ number of neutrons....which is 10+12=22

4 0
3 years ago
Which subatomic particles are located in the nucleus of a carbon atom?
Papessa [141]
Answer is (3) protons and neutrons.

(P.S. The outer part contains the electrons)
5 0
2 years ago
Read 2 more answers
How many neutrons would Oxygen-19 have
Softa [21]
Oxygen has 7 neutrons
8 0
3 years ago
Read 2 more answers
What evidence from an image of Paramecium indicates whether the organism is a prokaryote or a eukaryote?
Naily [24]
Your answer is B.
<em>Hope this helps... leave a 5-rate and a thanks!</em>
8 0
2 years ago
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