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olchik [2.2K]
3 years ago
6

What must models and theories do in order to remain valid? Provide 2 facts.

Chemistry
2 answers:
Sunny_sXe [5.5K]3 years ago
8 0

Answer:

1. Models and theories should explain known fact.

2. Models and theories should enable scientists to make accurate deductions and predictions.

Explanation:

A model involves the use of a physical, conceptual, or mathematical representation to describe a real phenomenon that could not be understood by mere direct observation. It could be in the form of a diagram or picture, aircraft model kit etc.

A theory is a well tested and confirmed phenomenon through repeated observations and experiments. It is a stronger assertion that explains the facts about a phenomenon. Such are not guesses or mere saying, but reliable accounts of some phenomenon in the real world.

Therefore for models and theories to be valid, they must explain known facts and enable scientists to make accurate predictions.

Andrews [41]3 years ago
6 0
Do what they was made to do
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Which of the following solutes has the greatest effect on the colligative properties for a given mass of pure water? Explain.
Strike441 [17]

Answer:

Option a.

0.01 mol of CaCl₂ will have the greatest effect on the colligative properties, because it has the biggest i

Explanation:

To determine which of the solute is going to have a greatest effect on colligative properties we have to consider the Van't Hoff factor (i)

These are the colligative properties:

ΔP = P° . Xm . i  →  Lowering vapor pressure

ΔT = Kb . m . i  → Boiling point elevation

ΔT = Kf . m . i  →  Freezing point depression

π = M . R . T  →  Osmotic pressure

Van't Hoff factor are the numbers of ions dissolved in the solution. For nonelectrolytes, the i values 1.

CaCl₂ and KNO₃ are two ionic solutes. They dissociate as this:

CaCl₂  → Ca²⁺ + 2Cl⁻

We have 1 mol of Ca²⁺ and 2 chlorides, so 3 moles of ions → i = 3

KNO₃ → K⁺ + NO₃⁻

We have 1 mol of K⁺ and 1 mol of nitrate, so 2 moles of ions → i = 2

Option a, is the best.

8 0
3 years ago
Enter the chemical formula of a binary molecular compound of hydrogen and a Group 4A element that can reasonably be expected to
irakobra [83]

Answer: GeH4 (Germanium(IV) Hydride)

Explanation:

A Binary molecular compound Hydrogen and a Group 4A element which is more more acidic than SiH4 in aqueous solution is GeH4.

The pKa of GeH4;

= 25

Whilst that of SiH4

= 35

The lesser the pKa the higher the Ka which means more acidic.

6 0
3 years ago
The term element refers to atoms that have the same number of _______.
erica [24]
I guess it’s Electrons
7 0
3 years ago
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What do you think the scientific question is for the<br> boiling water experiment
Mila [183]

Answer:

Scientific Question: ... I will boil water and add a substance like salt to see if the boiling point increases.

4 0
3 years ago
If you had 15 molecules of H2 and an unlimited supply of N2, how many
Masja [62]

Answer:

10 molecules of NH₃.

Explanation:

N₂ + 3H₂ --> 2NH₃

As the N₂ supply is unlimited, what we need to do to solve this problem is <u>convert molecules of H₂ into molecules of NH₃</u>. To do so we use the <em>stoichiometric coefficients</em> of the balanced reaction:

  • 15 molecules H₂ * \frac{2moleculesNH_3}{3moleculesH_2} = 10 molecules NH₃

10 NH₃ molecules could be prepared from 15 molecules of H₂ and unlimited N₂.  

8 0
3 years ago
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