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2 years ago

If you rub a magnet over a metal screw driver, you can magnetize the screw driver. This is because the magnet

Chemistry

1 answer:

ikadub [295]2 years ago

5 0

The magnet can cause the alignment of electron domains in the metal screw driver on rubbing, causing magnetism.

The magnetism in a permanent magnet is produced by magnetic moments of electrons in the magnet's constituent material. The material's atoms are each like tiny magnet bars. As a result of the quantum mechanical effect, the majority of these tiny magnets now prefer to align in a single direction to form domains, consequently magnetizing the entire substance.

Electrons exist in magnetic metals as well, although they are arranged differently. A strong magnet has a magnetic field strong enough to cause residual magnetism in the metal screwdriver by aligning the domains in it on rubbing with the metal.

Learn more about the magnetism here

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Calculate the boiling temperature of a 0.50 M solution of sucrose. Assume that the concentration is 0.50 m.

Ronch [10]

There is one missing point in the question.

The formula to find an increase in boiling Temperature is :

ΔT = kb x M

ΔT = is the increase in boiling Temperature
Kb = Boiling point constant of the Solvent
M = Molarity

You did not provide the Kb. If you have it, you just have to insert it to the formula to find the ΔT.

And assuming that the other solution is water, you just have to add it up with 100 Celcius

5 0

3 years ago

Rank the compounds in each set in order of increasing acid strength.

Viktor [21]

Answer:

See explanation

Explanation:

For this question, we have to remember the effect of an atom with high electronegativity as "Br". If the "Br" atom is closer to the carboxylic acid group (COOH) we will have an inductive effect. Due to the electronegativity of Br, the electrons of the C-H bond would be to the Br, then this bond would be weaker and the compound will be more acid (because is easier to produce the hydronium ion $H^+$ ).

With this in mind, for A in the last compound, we have 2 Br atoms near to the acid carboxylic group, so, we will have a high inductive effect, then the C-H would be weaker and we will have more acidity. Then we will have the compound with only 1 Br atom and finally, the last compound would be the one without Br atoms.

In B, the difference between the molecules is the position of the "Br" atom in the molecule. If the Br atom is closer to the acid group we will have a higher inductive effect and more acidity.

See figure 1

I hope it helps!

5 0

4 years ago

PLEASE HELP ASAP WILL GIVE BRAINLIEST

kirill115 [55]

The amount of heat required to convert H₂O to steam is : 382.62 kJ

Given data :

Mass of liquid water ( m ) = 150 g

Temperature of liquid water = 43.5°C

Temperature of steam = 130°C

<h3 /><h3>Determine the amount of heat required </h3>

The amount of heat required = ∑ q1 + q2 + q3 ----- ( 1 )

where ;

q1 = heat required to change Temperature of water from 43.5°C to 100°C . q2 = heat required to change liquid water at 100°C to steam at 100°C

q3 = heat required to change temperature of steam at 100°C to 130°C

For q1

M* S $_{water}$ *ΔT

= 150 * 4.18 * ( 100 - 43.5 )

= 35425.5 J

For q2

moles * ΔHvap

= (150 / 18 )* 40.67 * 1000

= 338916.67 J

For q3

M * S $_{steam}$ * ΔT

= 150 * 1.84 * ( 130 -100 )

= 8280 J

Back to equation ( 1 )

Amount of heat required = 35425.5 + 338916.67 + 8280 = 382622.17 J

≈ 382.62 kJ

Hence we can conclude that The amount of heat required to convert H₂O to steam is : 382.62 kJ.

Learn more about Specific heat of water : brainly.com/question/16559442

6 0

3 years ago

Where is the most of the mass of an atom located?

kow [346]

The mass of an atom located in the A) nucleus.

4 0

3 years ago

Someone help please let me know what the answer is

Colt1911 [192]

Answer:

7.25 mol

Explanation:

Given data:

Number of moles of sodium carbonate formed = ?

Number of moles of carbonic acid = 7.25 mol

Solution:

Chemical equation:

H₂CO₃ + 2NaOH → Na₂CO₃ + 2H₂O

Now we will compare the moles of sodium carbonate with carbonic acid.

H₂CO₃ : Na₂CO₃

1 : 1

7.25 : 7.25

So from 7.25 moles of carbonic acid same number of moles of sodium carbonate will form.

3 0

3 years ago