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2 years ago

A teacher divides her class into four groups. She assigns

Chemistry

1 answer:

babunello [35]2 years ago

7 0

Group C : 32.1°C , 31.9°C, 31.8°C makes the most precise measurements of the object's temperature.

Precision :The degree of similarity between study results of the experiment if they were performed today under comparable conditions.

If repeated measurements yield similar results, the measurement is considered precise (or repeated surveys).

It means how closely all the results are related .

Therefore, there should be less difference between the measurements of all the results.

In option (a) , there is a difference of 1° in all the results.

In option (b) , there is a difference of approximately 1.5° in all the results.

In option (c), there is only 0.2° difference in all the results.

In option (d) , there is a difference of 3° in all the results.

Therefore, All the option of group (c) are closely related.

Hence, Group (c) 32.1°C, 31.9°C, 31.8°C makes the most precise

measurements of the object's temperature.

Learn more about Precision & Accuracy here brainly.com/question/5792909

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How many sig figs are in 100.00?

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Answer:

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3 years ago

Static electricity is the buildup of electric charges in

Sauron [17]

Static electricity is the buildup of electric charges on surface of an object.
static electrical charges remain on the surface of the object until they bleed off to the ground or until they get quickly neutralised by a discharge.

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4 years ago

Which element has the highest electronegativity and why?

BigorU [14]

Answer:

See below

Explanation:

Hello there!

Electronegativity is the atom's tendency to attract electrons in a chemical bond

There are two trends to electronegativity:

Electronegativity increases from bottom to top in a group (Li has a greater electronegativity than Fr, for example)
Electronegativity increases from left to right across a period (the further right the group, the greater the electronegativity)

Looking at a period table, Sb, Sn, Te, and I are all in the same period, so we'll need to decide which element has the highest electronegativity based on the group.

Sn belongs to group 4A (group 14)
Sb belongs to group 5A (group 15)
Te belongs to group 6A (group 16)
I belongs to group 7A (group 17)

As I belongs to group 7A, the group that is the farthest right based off of the options given, I has the highest electronegativity

Hope this helps!

8 0

3 years ago

Assume at exactly 100.0°c and 1.00 atm total pressure, 1.00 mole of liquid water and 1.00 mole of water vapor occupy 18.80 ml an

Grace [21]

Answer 1) : When we calculate the ΔQ = -40.66 kJ (heat of vaporisation).

Then, we can relate the work done with this equation,

ΔW = -PΔV

First we need to calculate the volume, which will be,

Volume of water vapor = (nRT) / (P)

Then, V = (1 mole) X (0.0821 L X atm/mole X K) X (373.15K) / (1atm) = 30.6 liters So, it is given, and verified.

Volume of Water can be used for finding the; Density = M / V

D = ( 1 mole) X (18.02 g/mole) / (18.80 mL) = 0.9585 g/mL

On, substituting the values, we get,

ΔW = -PΔV

Work = - (1 atm) X (0.00188L - 30.62L) X 0.1013kJ/L X atm = 3.10 kJ

hence the work done is 3.10 kJ

Answer 2) Now, for calculating the internal energy, we can use the formula as,

ΔE = ΔQ + ΔW

Here, we have the values of ΔQ = -40.66 kJ and ΔW as = 3.10 kJ

So, we get, ΔE = (-40.66) + (3.10) = - 37.55 kJ

Therefore, the change in the internal energy will be -37.55 kJ.

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Why doesnt iron burst into flames when it rusts

Katarina [22]

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3 years ago