CHEMISTRY MIDDLE SCHOOL

What would happen to an EM wave that never came into contact with matter?

Answers

Answer 1
Answer:

If it was propogating through completely free space, it would be completely lossless and would therefore continue without change for infinity.


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HIGH SCHOOL

Technician A says that a soldering gun must be energized for several minutes before it warms up to the melting point of solder. Technician B says that a soldering torch is heated by burning butane gas. Who is right

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Answer:

Both are right

Explanation:

A constant heat must be supplied for several minutes to soldering gun to overcome the melting point of solder. A butane torch is a type of soldering device powered (energised) by the burning of butane gas to melt and solder common metals

HIGH SCHOOL

The native range of a species includes all areas in which it lives. True or False?

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False. The range of a species includes all areas in which it lives, but the native range of a species is where it, historically, originated and lived. The new range where the species lives may be called non native or invasive, or introduced if it is due to human interference.

Answer:

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Explanation:

COLLEGE

The man responsible for discovering that the atom is mostly space is: Millikan Dalton Bohr Einstein Rutherford

Answers

Answer: Rutherford.


Explanation:


It was the scientist Ernest Rutherford who, by 1911, performed the gold foil experiment in which α particles were shoot to a thin foild of gold.


That experiment showed that although most α particles passed through the thin gold foild, some of them were deviated in small angles and some other were bounced backward.


The conclusion of the experiment was that the atom contained a small dense positively charged nucleous and negative particles (electrons) surroundiing the nucleous. Being the space in between the nucleous and the electrons empty.


Before Rutherford's experiment the model of the atom was that of the plum pudding presented by J.J Thomson, in which the atom was a solid positively charged sphere with embeded negative charge uniformly distributed in it.



Rutherford
Mark brainliest please
HIGH SCHOOL

In the word equation, sodium oxide water sodium hydroxide, the formula for sodium hydroxide is represented by

Answers

Answer:
            Formula for sodium hydroxide is represented by NaOH.

Explanation:
                     The reaction of Sodium oxide with water is as follow,

                               Na₂O  +  H₂O    →    2 NaOH

Na₂O is considered as a strong basic oxide as it contains O²⁻ which has high tendency to bind with hydrogen atoms. This reaction is an exothermic reaction and is conducted in cold water to produce NaOH.

HIGH SCHOOL

What is a slogan for sulfur that rhymes

Answers

Using Rhyme Zone, you'll notice that nothing rhymes perfectly with sulphur, though there are a couple of near rhymes that you could use.

Color, suffer, thunder, and vulgar all are near rhymes and pertain rather closely to sulfur and have the same number of syllables.

Sulfur is yellow in color, you could write about that.
It smells vulgar, enough to make someone suffer.
Sulfur is also an ingredient in gunpowder, which explodes with a boom of thunder, and since gunpowder revolutionized war, it also made people suffer...you could also work in the word revolver, since that's kind of close.
MIDDLE SCHOOL

What is the relationship between the solubility of solid in liquid and temperature of the liquid

Answers

In this solution liquid is solvent  and the solid is solute. solid will be solve in liquid in normally but the increasing of tempreature make this solutuion speed higher because of preasure.
HIGH SCHOOL

25 g of ethyl alcohol is dissolved in 100 ml of water (density = 0.99993 at 20 oc). what is the % w/w for the ethyl alcohol in the resulting solution?

Answers

Percentage by mass is the amount in mass of a component in a mixture per 100 unit of mass of the total mixture. Percentage by mass is the same as  %w/w. We can determine this by dividing the mass of the solute with the total mass of the mixture. However, from the problem statement, we are given the volume of the water so there is a need to convert this value to mass by using the density of water. We calculate as follows:

Mass of solution = 100 mL (0.99993 g/mL) water + 25 g EtOH
Mass of solution = 124.993 g solution

%w/w = 25 g / 124.993 g x100
%w/w = 20% of EtOH
HIGH SCHOOL

State briefly the similarities and differences between the theories of Arrhenius and Bronsted-Lowry

Answers

My answer to the question above is not the best example but I hope it will help you. The Arrhenius model says that acids always contain H+ and that bases always contain OH-. 
The Bronsted-Lowry model thinks of acids as being proton donors and proton acceptors, so bases no longer need to contain OH-, and acids donate a proton to water forming H3O+. 
Lewis acids are electron pair acceptors, and Lewis bases are electron pair donors. For instance, H+ + OH- => H20. H+ has no electrons, so when it bonds to the Oxygen, it gains an electron pair. OH- "loses" an electron pair.
HIGH SCHOOL

Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites?

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Answer:

Which sequence of events is required to form a limestone cave where you can walk around and observe cave formations, such as stalactites? (Note: stalactites hang from the ceiling - they have to hold on tight to the roof.)

A geological sequence of events as involving the lowering of the water table to expose cave structures where stalactites and stalagmites form which is described as follows,

Explanation:

1. Acidic percolated water formed cavities of solution beneath the natural water table known as phreatic zone

2. After the passage of time there is a drop in the water table dropped forming caves from cavities

3. These caves, which are air filled voids that contains adequate environment for forming stalactites and stalagmites and where they are found

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