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3 years ago

Anne is trying to attract her metal pencil box with a magnet from the other side

Chemistry

1 answer:

Dima020 [189]3 years ago

5 0

Answer:

The pencil box is too far away from the magnet to make it move.

Explanation:

The most likely scenario here is that the pencil box is too far away from the magnet to make it move.

A magnet has a force field around it which dictates the region where magnetic influences can be felt when a magnetic body is brought near it.

Outside the force field, a magnet has no effect on a magnetic body.

Since the magnet is not attracting or repelling the metallic box of pencils, they most be located outside the field of force of the magnet.
When they are within the force field, repulsion or attraction occurs and the field draws the metal to itself or repel.

Objects that are far away from a magnetic source will feel no effect of the force field of a bar magnet.

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A hydrocarbon is a compound that contains mostly carbon and hydrogen. Calculate the percent composition (by mass) of the followi

Shalnov [3]

Answer: The percentages of carbon and hydrogen numerically to four significant figures is $83.33\%$ and $16.67\%$ respectively.

Explanation:

Molar mass of the compound is the mass of 1 mole of compound which is the sum of masses of each element.

Mass of 1 mole of compound= mass of carbon + mass of hydrogen+ = 5(12) + 12(1)= 72 g.

a) Percentage by mass of carbon = $\frac{\text {mass of carbon}}{\text {Total mass}}\times 100\ %$

Percentage by mass of carbon = $\frac{60}{72}\times 100\%=83.33\%$

b) Percentage by mass of hydrogen = $\frac{\text {mass of hydrogen}}{\text {Total mass}}\times 100\ %$

Percentage by mass of hydrogen = $\frac{12}{72}\times 100\%=16.67\%$

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3 years ago

Elements whose names end with âium are usually metals; sodium is one example. Identify a nonmetal whose name also ends with âium

Makovka662 [10]

Answer: Helium (He) and Selenium (Se) both are non metals ends with ium sound

Explanation:

He is a inert gas and Se belongs to oxygen family (VI A group)

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3 years ago

How many different types of toxins do molds make that can end up on our food and in our bodies?

Elis [28]

Answer:

I think it's more than 100,000 mold

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2 years ago

Can you determine the molecular formula of a substance from its percent composition

Natalka [10]

The percent composition<span> gives you only the empirical formula.
</span><span>To get the molecular formula, you must either know the molecular mass or do an experiment to find it.</span>

8 0

3 years ago

Consider the following reaction at constant P. Use the information here to determine the value of Î”Ssurr at 355 K. Predict whet

Sloan [31]

The given reaction is as follows:

2NO (g) + O₂ (g) = 2NO₂ (g), ΔH = -114 kJ

It is known that dSsurr = -dHsys / T (Temp = 355 K)

So, dSsurr = - (-114 × 1000) / 355

dSsurr = +321.12 J/K

Hence, the value of dSsurr is +321.12 J/K

For a reaction to be spontaneous, dG<0,

Also dStotal = dSsys + dSsurr > 0

It is known that dG = dHsys - TdSsys,

Now let us assume,

dG<0

Also, dStotal = dSsys + dSsurr > 0

(-114 × 1000) - (355 × dSsys) <0

355 × dSsys > -114 × 1000

dSsys > -321

dSsys >dSsurr

dSsys + dSsurr > 0

dStotal > 0

Thus, the assumption is correct, and the given reaction is spontaneous. Hence, the final answer is Ssurr = +321 J/K reaction is spontaneous.

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3 years ago