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Snowcat [4.5K]
3 years ago
8

Which is not reason for scientists to create models .

Chemistry
2 answers:
MatroZZZ [7]3 years ago
6 0

Answer:

Models are useful tools in learning science which can be used to improve explanations, generate discussion, make predictions, provide visual representations of abstract concepts and generate mental models

Explanation:

liberstina [14]3 years ago
4 0

Answer:

Well, one reason I can only think of is if they already have something drawn out (quickly, not thoroughly) on paper or digital and aren’t willing to build further usage on that project, or they’re in a hurry and they simply can’t. Though, I encourage all scientists to build a model, especially if you’re in an important situation/project, I guess it’s okay to not do one too.

Explanation:

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The compound methyl butanoate smells like apples. Its percent composition is 58.8% C, 9.9% H, and 31.4% O. What’s the empirical
blsea [12.9K]
To find the empirical formula you would first need to find the moles of each element:

58.8g/ 12.0g = 4.9 mol C

9.9g/ 1.0g = 9.9 mol H

31.4g/ 16.0g = 1.96 O

Then you divide by the smallest number of moles of each:

4.9/1.96 = 2.5

9.9/1.96 = 6

1.96/1.96 = 1

Since there is 2.5, you find the least number that makes each moles a whole number which is 2.

So the empirical formula is C5H12O2.
6 0
4 years ago
Use the naming conventions to complete the following formula-name pairs of binary acids. Match the acid names and chemical formu
ohaa [14]

Answer:

This looks like a hard question for me is this biology

Explanation:

6 0
3 years ago
In which type of reaction can two compounds exchange ions to form two different compounds? synthesis decomposition single replac
kap26 [50]
Double replacement reaction
6 0
3 years ago
Identify the oxidizing agent in the following redox reaction.
Colt1911 [192]

Answer:

Hg²⁺

Explanation:

In the given reaction, Hg²⁺ is the oxidizing agent in the reaction.

An oxidizing agent is any specie that undergoes reduction in the course of a reaction. Such specie;

  • shows removal of oxygen
  • addition of hydrogen
  • gain of electrons
  • decrease in oxidation number

The reaction               Hg²⁺  +  Cu       →      Cu²⁺    +   Hg

  here Hg, goes from an oxidation state of 2 to 0. This is a decrease

3 0
4 years ago
The contact angle for water on paraffin is 106 degrees at 25 °C. Calculate the work of adhesion and cohesion and the spreading c
Valentin [98]

Explanation:

When two immiscible liquids are separated out at their boundary when they are present in two sections then there occurs an increase in their surface energy and it is known as work of adhesion.

It is given that contact angle for water on paraffin is 106^{o} and temperature is 25^{o}C.

                     w_{a} = \sigma (1 + Cos \Theta)

where,       \Theta = contact angle

                  \sigma = surface tension for water

Here, the two immiscible liquids are water and paraffin. Also, it is known that at 25^{o}C, \sigma_{water} is 72 dynes/cm.

Hence, work of adhesion will be calculated as follows.

                      w_{a} = \sigma (1 + Cos \Theta)

                                       = 72 (1 + Cos (106^{o}))

                                        = -19.84 dynes/cm

Hence, the work of adhesion is -19.84 dynes/cm.

When we separate out a column of pure liquid into two halves then there occurs an increase in free energy. This is known as cohesion.

Expression for work of cohesion is given as follows.

                            w_{c} = 2 \sigma_{water}

                                      = 2 \times 72

                                      = 144 dynes/cm

Hence, the work of cohesion is 144 dynes/cm.

The difference between work of adhesion and work of cohesion is known as spreading coefficient.

                       S = w{a} - w_{c}

                          = -19.84 dynes/cm - 144 dynes/cm

                           = - 163.84 dynes/cm

Hence, the spreading coefficient is  - 163.84 dynes/cm.

8 0
3 years ago
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