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Fittoniya [83]
4 years ago
12

Which is an example of making a qualitative observation

Chemistry
1 answer:
rusak2 [61]4 years ago
6 0

Explanation:

I would say its B

Because Qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. They do not involve measurements or numbers. For instance, colors, shapes, and textures of objects are all qualitative observations. so its using your 5 senses

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Sedbober [7]
Percentage composition of a compound is a ratio of an amount of each element to the total amount of individual elements in a compound, which is then multiplied with 100.
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3 years ago
1. What is the theory that is accepted as a true<br> called? I
Harlamova29_29 [7]

Answer: Scientific Theory

Explanation:

A scientific theory is a broad explanation for events that is widely accepted as true. To become a theory, a hypothesis must be tested over and over again, and it must be supported by a great deal of evidence. People commonly use the word theory to describe a guess about how or why something happens.

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3 years ago
Every ________ will have its own unique set of quantum numbers.
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Answer:

D. individual electron

Explanation:

7 0
3 years ago
Manganese metal can be obtained by the reaction of manganese dioxide with aluminium. 4Al(s) + 3MnOz(s) → 2 Al2O3(s) + 3 Mn(s) Ca
Snezhnost [94]

Answer : The enthalpy change of reaction is -1800 kJ

Explanation :

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The given final reaction is,

4Al(s)+3MnO_2(s)\rightarrow 2Al_2O_3(s)+3Mn(s)    \Delta H=?

The intermediate balanced chemical reaction will be,

(1) 2Al(s)+\frac{3}{2}O_2(g)\rightarrow Al_2O_3(s)    \Delta H_1=-1680kJ/mole

(2) Mn(s)+O_2(g)\rightarrow MnO_2(s)    \Delta H_2=-520kJ/mole

First we will multiply reaction 1  by 2 and reverse reaction of reaction 2 by 3 then adding both the equation, we get :

The expression for final enthalpy is,

\Delta H=[n\times \Delta H_1]+[n\times (-\Delta H_2)]

where,

n = number of moles

\Delta H=[2mole\times (-1680kJ/mole)]+[3\times -(-520kJ/mole)]

\Delta H=-1800kJ

Therefore, the enthalpy change of reaction is -1800 kJ

8 0
3 years ago
Someone please help me
Setler79 [48]

Answer:

8510 mol

Explanation:you must divide both of the molar masses into each other

5 0
3 years ago
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