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seraphim [82]
4 years ago
12

Quick! You mix two liquids together, and they begin to bubble. Has a chemical reaction occurred? Why or why not? (Please explain

to the best of your ability in your own words and not copy off other websites or other answers, thanks) :)
Chemistry
2 answers:
Mamont248 [21]4 years ago
8 0
Pretty obiously somethings happening when they bubble otherwise i think it would jsut be like mixing water with vinegar
oksian1 [2.3K]4 years ago
4 0

Yes a chemical reaction has occurred, because it fizzled, ad probably gave off energy as a result of the reaction


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9. Which of the following is true when we compare solids and gases?
djyliett [7]

Answer: b

Explanation:

8 0
4 years ago
What is the entropy of this collection of training examples with respect to the positive class B. What are the information gains
Alenkinab [10]

The data set is missing in the question. The data set is given in the attachment.

Solution :

a). In the table, there are four positive examples and give number of negative examples.

Therefore,

$P(+) = \frac{4}{9}$   and

$P(-) = \frac{5}{9}$

The entropy of the training examples is given by :

$ -\frac{4}{9}\log_2\left(\frac{4}{9}\right)-\frac{5}{9}\log_2\left(\frac{5}{9}\right)$

= 0.9911

b). For the attribute all the associating increments and the probability are :

  $a_1$   +   -

  T   3    1

  F    1    4

Th entropy for   $a_1$  is given by :

$\frac{4}{9}[ -\frac{3}{4}\log\left(\frac{3}{4}\right)-\frac{1}{4}\log\left(\frac{1}{4}\right)]+\frac{5}{9}[ -\frac{1}{5}\log\left(\frac{1}{5}\right)-\frac{4}{5}\log\left(\frac{4}{5}\right)]$

= 0.7616

Therefore, the information gain for $a_1$  is

  0.9911 - 0.7616 = 0.2294

Similarly for the attribute $a_2$  the associating counts and the probabilities are :

  $a_2$  +   -

  T   2    3

  F   2    2

Th entropy for   $a_2$ is given by :

$\frac{5}{9}[ -\frac{2}{5}\log\left(\frac{2}{5}\right)-\frac{3}{5}\log\left(\frac{3}{5}\right)]+\frac{4}{9}[ -\frac{2}{4}\log\left(\frac{2}{4}\right)-\frac{2}{4}\log\left(\frac{2}{4}\right)]$

= 0.9839

Therefore, the information gain for $a_2$ is

  0.9911 - 0.9839 = 0.0072

$a_3$     Class label      split point       entropy        Info gain

1.0         +                        2.0            0.8484        0.1427

3.0        -                         3.5            0.9885        0.0026

4.0        +                        4.5            0.9183         0.0728

5.0        -

5.0        -                        5.5            0.9839        0.0072

6.0        +                       6.5             0.9728       0.0183

7.0        +

7.0        -                        7.5             0.8889       0.1022

The best split for $a_3$  observed at split point which is equal to 2.

c). From the table mention in part (b) of the information gain, we can say that $a_1$ produces the best split.

4 0
3 years ago
A catalyst can increase the rate of a reaction ________. Select one: a. by increasing the overall activation energy (Ea) of the
makvit [3.9K]

Answer:

by providing an alternative pathway with a lower activation energy

Explanation:

Cataysts are the substances that neither consumed nor produced during a chemical reaction, but increase the rate of the reaction.

So, catalysts remain chemically unchnaged after the completion of the reaction.

For a reaction to occur, reactants molecule must collide and successful collisions lead to product formation.

A certain minimum amount of energy is required for successful collision. This minimum amounr of energy is called activation energy.

One way to increase speed of reaction is to provide energy to the reactants  and other way to increase speed is to provide alternate pathway with lower activation energy.

Catalyst increases a rate of reaction by providing an alternate pathway with lower activation energy.

Therefore, the correct option is option b 'by providing an alternative pathway with a lower activation energy'

5 0
4 years ago
The Society of Automotive Engineers has established an accepted numerical scale to measure the viscosity of motor oil. For examp
natta225 [31]

Answer:

Most viscous to least viscous: (c)> (b)> (a)

Explanation:

For hydrocarbons, viscosity increases with increasing molar mass. Because increasing molar mass signifies increase in number of electrons in molecules.

We know that in non-polar hydrocarbons, only van der waal intermolecular force exists. Van der waal force is proportional to number of electrons in a molecule.

Therefore with increasing molar mass, van der waal force increases. hence molecules gets more tightly bind with each other resulting increase in viscosity.

Here molar mass order : (c)> (b)> (a)

Therefore viscosity order : (c)> (b)> (a)

5 0
4 years ago
Why is it difficult for countries to reduce emissions of carbon dioxide
Natalka [10]

Answer:

Curbing global carbon dioxide emissions has been a challenge, primarily because they are being driven higher by countries with low per capita emissions.

Explanation:

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3 0
3 years ago
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