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Elan Coil [88]
4 years ago
6

Scientific models _______. a. are based on a set of observations b. are used to replace experiments c. allow the study of existi

ng systems only d. are rarely used Please select the best answer from the choices provided A B C D
Chemistry
2 answers:
vladimir2022 [97]4 years ago
3 0

Answer:

i would say C

Explanation:

You can only make a model of something if the real thing already exists.

blondinia [14]4 years ago
3 0

Answer:

The correct answer will be option-C.

Explanation:

The scientific models are the simplified visual representations of the complex studied systems of nature.  

The scientific models could be 2 dimensional or 3 dimensional which plays an  important role in scientific studies as they are used by the researchers to prove the validity of their hypothesis if they can be proved or disproved.

They are used by the scientists to explain the complex models to the layman in simple language which helps them able to understand the complex models.

Since the models are used to explain the complex systems which has been discovered therefore Option-C is the correct answer.

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What are the possible values of ml for l=2<br> ​
Marrrta [24]

Answer:

-2, -1, 0, 1, 2

Explanation:

There are four types of quantum numbers;

1) Principal quantum number (n)

2) Azimuthal quantum number (l)

3) magnetic quantum number (ml)

4) Spin quantum number (s)

The azimuthal quantum number (l) describes the orbital angular momentum and shape of an orbital while the magnetic quantum number shows the projections of the orbital angular momentum along a specified axis.  This implies that the magnetic quantum number shows the orientation of various orbitals along the Cartesian axes. The values of the magnetic quantum  number ranges from -l to + l

For l= 2, the possible values of the magnetic quantum number are; -2, -1, 0, 1, 2

5 0
3 years ago
If element X has 83 protons, how many electrons does it have? ______ electrons
Zolol [24]
The element has 83 electrons
5 0
3 years ago
Give three examples of heterogeneous mixtures and three examples of solutions that you might use in everyday life.
beks73 [17]

Answer:

Explanation:

Heterogeneous mixtures: Milk, salt and pepper, smog, chocolate chip cookie, oil and water.

Solutions we might use everyday: Gatorade, Apple Juice, most wines and liquor, liquid detergent, coffee etc.

7 0
3 years ago
An ideal gas contained in a piston-cylinder assembly is compressed isothermally in an internally reversible process.
Tju [1.3M]

Answer:

a) \Delta S

b) entropy of the sistem equal to a), entropy of the universe grater than a).

Explanation:

a) The change of entropy for a reversible process:

\delta S=\frac{\delta Q}{T}

\Delta S=\frac{Q}{T}

The energy balance:

\delta U=[tex]\delta Q- \delta W

If the process is isothermical the U doesn't change:

0=[tex]\delta Q- \delta W

\delta Q= \delta W

Q= W

The work:

W=\int_{V1}^{V2}P*dV

If it is an ideal gas:

P=\frac{n*R*T}{V}

W=\int_{V1}^{V2}\frac{n*R*T}{V}*dV

Solving:

W=n*R*T*ln(V2/V1)

Replacing:

\Delta S=\frac{n*R*T*ln(V2/V1)}{T}

\Delta S=n*R*ln(V2/V1)}

Given that it's a compression: V2<V1 and ln(V2/V1)<0. So:

\Delta S

b) The entropy change of the sistem will be equal to the calculated in a), but the change of entropy of the universe will be 0 in a) (reversible process) and in b) has to be positive given that it is an irreversible process.

7 0
3 years ago
What are the 5 indicators of a chemical reaction? What are the 5 indicators of a chemical reaction? I only know 3 for sure:2) Ch
Colt1911 [192]
Temperature change, colour change, releasing gas, bubbles and change in odor
5 0
3 years ago
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