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svlad2 [7]
3 years ago
6

Explain why and how theories may be changed or replaced over time.

Chemistry
2 answers:
denis23 [38]3 years ago
6 0

Answer:

Theories may be changed over time as new information is discovered or new technologies are developed. New developments lead to changes in experimental methods, which provide information that may or may not support the existing theory. If the theory is still supported, it may be updated. If it is not supported but the results are true and relevant, the theory may be replaced.

Explanation:

It was the sample response on edge

Mandarinka [93]3 years ago
5 0
The evolution of a scientific theory. A scientific theory is not the end result of the scientific method; theories can be proven or rejected, just like hypotheses. Theories can be improved or modified as more information is gathered so that the accuracy of the prediction becomes greater over time
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Can you please help me ?
disa [49]

Answer:

6.82 moles of Fe2O3

Explanation:

Step 1:

Determination of the number of mole of in 450g of CO2.

This is illustrated below:

Molar Mass of CO2 = 12 + (2x16) = 44g/mol

Mass of CO2 = 450g

Number of mole of CO2 =.?

Number of mole = Mass/Molar Mass

Number of mole of CO2 = 450/44 = 10.23 moles

Step 2:

Determination of the number of mole of Fe2O3 needed for the reaction. This is illustrated below:

2Fe2O3 + 3C—> 4Fe + 3CO2

From the balanced equation above,

2 moles of Fe2O3 reacted to produce 3 moles of CO2.

Therefore, Xmol of Fe2O3 will react to produce 10.23 moles of CO2 i.e

Xmol of Fe2O3 = (2x10.23)/3

Xmol of Fe2O3 = 6.82 moles

Therefore, 6.82 moles of Fe2O3 is required.

3 0
3 years ago
Why is a fish considered an organism but a rock is not?
gizmo_the_mogwai [7]
A fish is a living thing and a rock is not 
6 0
4 years ago
2Na + CaF2à 2NaF + Ca is an example of a _________ chemical reaction.
marusya05 [52]
<span>2 Na + CaF</span>₂<span> = 2 NaF + Ca

is an example of a </span>single- replacement

answer D

hope this helps!
6 0
4 years ago
Glass vessel calibrated to contain 9.76 mL of water at 4°C was found to weigh 22.624 g when empty and dry feel the weight of sod
dedylja [7]

This is the complete question with grammar corrections:

A glass vessel calibrated to contain 9.76 mL at 4° C was found to weigh 22.624 g when empty and dry. Filled with a soduim chloride (NaCl) solution at the same temperature , it was found to weigh 32.770 g. Calculate the solution's density.

Answer:

<u></u>

  • <u>1.04 g/ml</u>

Explanation:

<em>Density</em> is the physical property that expresses the amount of matter (mass) per voumetric unit of solution:

  • Density = mass / volume.

In this problem, you can first calculate the mass, by difference. After that, you just have to divide the mass by the volume of the glass vessel (9.76 ml as per the calibration).

This is the two steps procedure.

<u>1. Mass of the solution:</u>

  • Mass of solution = mass of the vessel filled with the solution - mass of the vessel, empty and dry

       Mass of solution = 32.770 g - 22.624 g = 10.146 g

<u>2. </u><em><u>Solution's density</u></em><u>:</u>

  • density = mass / volume = 10.146 g / 9.76 ml = 1.0395 g / ml ≈ 1.04 g/ml

The density is rounded to 3 significant digits because the volume, which is dividing the mass, was reported with 3 significant digits.

3 0
4 years ago
Read 2 more answers
What is an echo? (1 point)
zaharov [31]

Answer:

The reflection of sound waves

Explanation:

An echo is a reflection of sound that bounces of of one thing to another.

4 0
3 years ago
Read 2 more answers
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