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Hatshy [7]
3 years ago
9

Kobe is testing whether 100 g of substance A, 100 g of substance B, or 100 g of substance C produces more oxygen in a chemical r

eaction at 25°C. What is the independent variable? a) the nature of the substances.b) the masses of the substances.c) the amount of oxygen produced.d) the temperature of the substance.
Chemistry
2 answers:
ella [17]3 years ago
5 0

Answer: Option (a) is the correct answer.

Explanation:

An independent variable is defined as a variable whose value or which is controlled in a scientific experiment. Basically, an independent variable is able to change the value of dependent variable.

The value of an independent variable can be changed by the experimenter.

For example, nature of substances in a chemical reaction will act as an independent variable.

This is because if a substance is reactive in nature then in the presence of another substance cannot become unreactive. Hence, nature of a substance is an independent variable.

Thus, we can conclude that out of the given options the nature of the substances is the independent variable.

rewona [7]3 years ago
4 0

Answer:

The answer is A.

Explanation:

Kobe is testing whether 100 g of substance A, 100 g of substance B, or 100 g of substance C produces more oxygen in a chemical reaction at 25°C.

What is the independent variable?

>the nature of the substances

the temperature of the substances

the amount of oxygen produced

the masses of the substances

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In one sample of a compound of copper and oxygen, 3.12g of the compound contains 2.50g of copper and the remainder is oxygen. Ca
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Answer:

% composition O = 19.9%

% composition Cu = 80.1%

Explanation:

Given data:

Total mass of compound = 3.12 g

Mass of copper = 2.50 g

Mass of oxygen = 3.12 - 2.50 = 0.62 g

% composition = ?

Solution:

Formula:

<em>% composition = ( mass of element/ total mass)×100</em>

% composition Cu = (2.50 g / 3.12 g)×100

% composition Cu = 0.80 ×100

% composition Cu = 80.1%

For oxygen:

<em>% composition = ( mass of element/ total mass)×100</em>

% composition O = (0.62 g / 3.12 g)×100

% composition O = 0.199 ×100

% composition O = 19.9%

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3 years ago
Dalton's contribution was different from thatof the ancient Greek who postulated the existence of atoms. Point out the differenc
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Explanation:

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Although the data for the experiment was not provided, we can offer a generalized answer in that when performing an experiment to achieve absolute zero temperatures, the value will never match the exact value.

<h3 /><h3>What is absolute zero?</h3>

Absolute zero is the lower limit of temperature. It is considered the coldest possible temperature that can exist. However, any attempt to reach this temperature in a controlled environment has failed, <u>scientists do not think it is possible to recreate this </u><u>temperature</u><u>. </u>

Therefore, we can confirm that the value of the absolute zero experiments did not match the accepted value. If the hypothesis was that it would be difficult or impossible to achieve, then the data would support the hypothesis, otherwise, it would fail to do so.

In summary, absolute zero is a temperature that cannot be recreated in a lab, so the value in this experiment does not match the accepted value and there is <u>no further exploration </u>to be done on this matter.

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Identify the two main materials that can be found in the inner and outer core layers of the earth.
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A. Iron D. Nickel hope this helps you!
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An example of a physical property of an element is the element's ability to what?
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Explanation:

Appearance, melting point, density, solubility, polarity

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