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stira [4]
4 years ago
11

An electromagnets different from a permanent magnets because an electromagnet blank

Chemistry
1 answer:
gizmo_the_mogwai [7]4 years ago
8 0
An electromagnet can be turned on or turned off which makes it useful for construction purposes to lift heavy metal objects.
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The density of seawater increases as temperature __________ and salinity __________.
Marianna [84]

Answer:

decrease; increase

Explanation:

8 0
1 year ago
In acid rain, nitrogen oxides and sulfur oxides from emissions cause a change in the normal pH level. Which of the following is
kow [346]

The pH levels of acid rain are very acidic; in the range of 2.0-3.0, is not true for acid rain.

Answer: D

Explanation

Acid rain is termed for the rain which contains acidic precipitations.

The precipitations of acids are generally made up of sulfuring and nitric acid.

The sulfuric and nitric acids were formed by the chemical reaction occurring between the water, oxygen and other chemicals present in the atmosphere with the sulfur-di-oxide and nitrous oxide emitted in the atmosphere due to burning of natural resources, fossil fuels, etc.

The chemical reaction of these oxides with water, oxygen and other chemicals leads to formation of acids.

Some of the oxides are emitted from burning of natural resources while the major emissions occur from burning of fossil fuels.

Also the oxides react in atmosphere to form acids.

So the options (A),(B) and (C) are true for acid rain.

But the option (D) is not true as the acid rain is not much acidic in nature, as it is getting dissolved in water so the range of acidity is 4.2-4.4 and not 2.0-3.0.

7 0
3 years ago
A student pipets 10 ml of a 0.0693 m solution of kbr into a 500 ml volumetric flask and dilutes to the mark. what is the concent
Sonja [21]

The initial concentration of solution is 0.0693 M. The volume of solution taken is 10 mL and it is diluted to a final volume of 500 mL.

According to dilution law, the product of initial concentration and volume is equal to the product of final concentration and volume as follows:

C_{1}V_{1}=C_{2}V_{2}

Here, C_{1} is initial concentration, C_{2} is final concentration, V_{1} is initial volume and V_{2} is final volume.

Rearranging to calculate final concentration,

C_{2}=\frac{C_{1}\times V_{1}}{V_{2}}

Putting the values,

C_{2}=\frac{0.0693 M\times 10 mL}{500 mL}=0.001386 M

Therefore, concentration of the resulting solution is 0.001386 M.

7 0
3 years ago
In which of the following situations is heat transferred from the source to popcorn kernels by the method of conduction?
faltersainse [42]

Answer:

Kernels are placed in a pan on a stove

Explanation:

Heat transfer by conduction involves the actual movement between particles of the medium. For conduction to occur, the particles must be in contact with the heating medium or the body at a higher temperatures.

For the popcorn kernels to conduct heat using the conduction heat transfer process, the kernels are placed in contact with the heat source using the frying pan. The stove is the heat source.

When put a knife in contact with fire, it is heat transfer by conduction.  

5 0
3 years ago
Which substance is an Arrhenius base?<br> (1) CH3OH (3) LiOH<br> (2) CH3Cl (4) LiCl
Nana76 [90]
According to Arrhenius Theory of acids and bases, an Arrhenius base produces OH-.

Among the four options, (3) LiOH is the correct one because it can separate into Li+ and OH- when being put in water.

Hope this helps~
7 0
3 years ago
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