Why are the melting and boiling points of an
element or a compound are called its fixed points.

Answers

Answer 1

Substances having fixed chemical proportions will have fixed boiling and melting points. This is the reason that Pure substances have specific melting and boiling points because their chemical proportions are fixed. Mixtures melt and boil over a range of temperatures

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Related Questions

The Statue of Liberty is composed of copper. The smallest particle of any amount of copper is A) an atom. B) an element. C) a compound. Eliminate D) a molecule.

Answers

an atom because its the smallest thing in the entire world and in all orgnaisms

how does the value of g on the earth is related to the mass of the earth and its radius drive it ​

Answers

The relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is [tex]g = \frac{GM}{R^2} [/tex].

What is weight of an object?

The weight of an object is determined as the product of the object's mass and acceleration due to gravity.

F = mg

The gravitational force on objects in the universe

The gravitational force between two objects in the universe is directly proportional to the product of mass of the objects and inversely proportional to the square of the distance between the objects.

[tex]F = \frac{GmM}{R^2} [/tex]

[tex]mg = \frac{GmM}{R^2} \\\\ g = \frac{GM}{R^2} [/tex]

where;

M is the mass of the earth

R is the radius of the earth

Thus, the relationship between acceleration due to gravity (g), mass of earth (M) and the radius of earth (R) is [tex]g = \frac{GM}{R^2} [/tex].

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dose any body know 2(-3+6)=
______
3

Answers

Answer: The answer is 6  

1) Simplify  -3+6  to  3.

2×3

And then Simplify.

6

Sorry if im wrong

the high electrical conductivity of metals is primarily due to

Answers

High conductivity of metals is caused by electrons that are free to move through the lattice.

hope this helps!

Some acids like acetic acid and tartaric acid cannot be tasted
TRUE OR FALSE

Answers

The statement is a false.

An acid is a substance which when dissolved in water, produces hydroxonium ion, as the only positive ion.

Some properties of acid include:

They have sour tastes and

Strong acids are corrosive.

There are two types of acids which includes:

Strong acids: These are the acids that ionizes completely in solution.

Weak acid: These are the acids that ionizes incompletely in solution.

Examples of weak acid is acetic acid and tartaric acid.

They can be used as food substances like vinegar and naturally occurs on fruit like banana or grape.

Therefore, weak acids such as acetic acid and tartaric acid can be tasted.

Learn more about weak acids here:

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The given statement is False.

Some acids like acetic acid and tartaric acid can be tasted.

Organic acids, such as acetic, citric, malic, and fumaric acids in fruits and vegetables, and tartaric acid in wine, contribute significantly to the sour flavor of foods and beverages. Many inorganic acids taste sour in dilute solutions.

Tartaric acid is fairly water soluble and has a pronounced tart flavor. Tartaric acid is present naturally in grapes and bananas and has been shown to improve the flavor of grape and lime-flavored beverages. Tartaric acid may aid in the treatment of glucose intolerance and digestion.

Acetic acid is a colorless liquid having a sour flavor. Although it is most frequently associated with vinegar, this acid has a wide range of different applications in a variety of industries. Acetic acid is a colorless liquid that is composed of chemical compounds.

To know more about Acetic acid,

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“Burning of fossil fuels causes pollution.” Suggest alternative methods by
which we can overcome this global issue in less than 250 words.

Answers

An alternative method by which we can overcome this global issue is by harnessing Solar energy.

Discussion:

Fossil fuels cause environmental pollution. This is because they are organic compounds and on combustion, they release air pollutants such as, Carbon monoxide.

As a panacea, the use of solar panels for harnessing Solar energy in a bid to replace energy from fossil fuels will prove to be am effective method by which we can overcome the global issue of pollution caused by burning of fossil fuels.

Solar energy is a clean source of energy as there's no release of harmful air pollutants.

Read more on fossil fuels:

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Alternative method by which we can overcome this global issue is by

harnessing energy with less form of pollution. These include:

Solar energyHydropowerNuclear energy

Fossil fuel burning releases greenhouse gases such as Carbon dioxide,

nitrous oxide etc which causes pollution to the atmosphere.

It is best to adopt alternative methods mentioned above to ensure pollution

is reduced to the barest minimum. This helps to prevent ozone depletion and

global warming. It also reduces risks of respiratory diseases due to the

inhalation of the gases.

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what are the three molecules that are attached to the plasma membrane, and what are their roles/ functions?

Answers

Answer:

Ans:

*Carbohydrates

*Proteins

*Cholesterol

Explanation:

The plasma membrane is a structure that has several distinct roles in the cell

The plasma membrane is mainly composed of the phospholipid Bilayer, which is a layer of two sheets located in the internal and external parts. The Phospholipids are said to be Amphipathic because they have both properties of Hydrophobic and hydrophilic

*The Carbohydrate Molecules attach to the Plasma Membrane such as to the lipids and Proteins:

when They attach to the Proteins, they are known as glycoproteins, and they help in cell recognition, when they attach to the lipids, they are known as Glycolipids

*Protein Molecules play an important role in transport system such as Carrier Proteins

*Cholesterol Molecules help in balancing the Fluidity of the plasma membrane

hope this was of use

During the Cellular Respiration reaction glucose reacts with oxygen gas
to form water and Carbon Dioxide. How much carbon Dioxide would be formed from 58 grams of glucose?

Answers

try putting 66 grams CO2 for answer

Question 20 0/1 pts What is the frequency of a light wave with the wavelength of 680 nm? 'Reminder: the speed of light is 3.00 X 10 m/s​

Answers

Answer:

[tex]4.4*10^{14}[/tex]Hz

Explanation:

what would happen if we lost our planets core on earth blew up, would we all die or will we lose gravity or suficate, pls help. :I

Answers

Answer: if we lost our core it would be an entire fallout like fallout 76 we would have no way to protect ourselves from the radiation of space except for a select few that actually own astronaut suits tho we would not turn into monsters, sadly :( I wanna be a ghoul

Determine the highest occupied energy level in the
following elements:
a. He
b. Be
c. Al
d. Ca
e. Sn

Answers

He, because it’s a noble gas which they have full valence electrons (occupied energy levels)

How did the believers show their fellowship with one another?​

Answers

Answer:

I think you may have chosen the wrong subject for your question, besides where is the context to this?

How does distillation remove hardness from water​

Answers

Answer:

Distillation can be used to soften water as the water evaporates as it is heated and the ions are left behind.

Hope that helps. x

Answer: Distillation can be used to separate and collect a liquid from a solution. Distillation can also be used to soften water as the water evaporates as it is heated and the ions are left behind. Hard water can be softened by adding sodium carbonate (washing soda) or by passing the water through an ion-exchange column.

Explanation:

which acid is part of the white coating on sour patch kids?

Answers

Tartaric acid is the white, powdery substance that coats tart candies such as Sour Patch Kids. COmbustion analysis of a 12.01g sample of tartaric aid, which contains carbon, hydrogen and oxygen, produces 14.08g CO2 and 4.32g

H2O.

i would know because i have see what there made of

Which is the correct measure of density?
Cm^2/g
g/cm^3
cm^3/g
mass x volume

Answers

Answer:

g/cm^3

Explanation:

Density= m/v

gram is a measurement of mass

cm^3 is a measurement of volume

Hope this helps:) Have a good day!

I think it is g/cm^3

100 POINTS PLZZ HELPP
draw the correct structural formula for the following molecules

Answers

Answer:

I cant see the questions can u do a picture zoomed in, thanks :)

Explanation:

Select the three hypotheses that explain why being born in the United States leads to a higher chance of developing allergies


- The weather patterns in the United States bring more allergens compared to other countries

- cultural practices may play a part because some cultural foods have different anti-allergenic properties

- other factors which might influence why there are more children with allergies in the United States include climate, obesity, and the typical western diet with high amounts of processed foods.

- children in the United States are taught to believe in allergens, but really allergens don’t really exist.

- The hygiene hypothesis claims that children in the United States are not exposed to enough germs in their infancy and childhood to develop their immune system‘s properly.

Answers

The three hypotheses that explain why being born in the United States

leads to a higher chance of developing allergies include the following:

The weather patterns in the United States bring more allergens compared to other countries.Other factors which might influence why there are more children with allergies in the United States include climate, obesity, and the typical western diet with high amounts of processed foods.The hygiene hypothesis claims that children in the United States are not exposed to enough germs in their infancy and childhood to develop their immune system‘s properly.

Allergies are caused by a host of factors such as :

ClimateDietImmune system

These factors is the reason why the chosen hypotheses are the most

appropriate.

Read more about Hypotheses here https://brainly.com/question/10854125

Which term describes the small, somewhat circular pattern of wind?

A Easterlies

B Trade Winds

C polar winds

D convection cells

Answers

Answer:

its D, convection cells

How many moles of AgCl can form from 6.5 moles of Ag and abundant HCl in the equation: 2Ag + 2HCl -> 2AgCl + H2

Answers

6.5 moles of AgCl can be formed from 6.5 moles of Ag.

STOICHIOMETRY:

According to this question, silver reacts with hydrochloric acid to form silver chloride and hydrogen gas as follows:

2Ag + 2HCl → 2AgCl + H2

Based on this balanced equation, 2 moles of silver (Ag) produces 2 moles of silver chloride (AgCl).

This means that 6.5 moles of Ag will produce (6.5 × 2)/2 = 6.5 moles of AgCl.

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True or false pls sue tmrps

Answers

Answer:

5. False

Explanation:

Drinking contaminated water causes jaundice

1. Have scientists been able to invent a perpetual motion machine?
O Yes
O No

Answers

After using my big brain it’s No
The answer is No
I think this way because of the law of first law of thermodynamics where it says that energy can't be created or destroyed. This means you can’t receive more energy then you put in. In conclusion a machine could only ever produce as much energy as it consumed.

the two stages that take place during distillation are. a.evaporation is folloeed by condensation. b.condensation followed by evaporation​

Answers

Answer:

evapiration followed by condensation

the expression of potential energy , i.e., P.E.=mgh , where the terms used have their usual meaning​

Answers

Gravitational Potential energy:

The Gravitational potential energy of

an object at a point above the ground

is defined as the work done in raising

it from the ground to that point against

gravity.

Consider an object of mass "m" is raised

to heighth from the ground.

A force is required to do this. the

minimum force required to raise the

object is equal to the weight of the

object[mg]

The object gains energy equal to the

work done on it. Let the work done on

the object against gravity be "w"

WorkDone=W= Force x displacement

=mgxh

..W=mgh

since the workdone on the object is

equal to "mgh" an energy equal to "mgh"

units is gained by object.This is the

potential energy of object at height "h"

.. P.E=mgh

If you run a refrigerator in a closed room with the refrigerator door open,the room temperature willA) increase.B) decrease.C) remain unchanged.

Answers

Answer: A increase

Explanation: The temperature of room will increase. If a refrigerator door is open then more flow rate of coolant is required in order to maintain lower temperature So the compressor will be running continuously also heat exchange happening through condenser increases the room temperature rather than decreasing.

look at the chemicals listed below and answer the questions . iron
water
sand
oxygen
gold
carbon dioxide
helium
carbon
rust
seawater
1. Name the two metals
2.Name a gas that is not an element
3.Name a mixture
4.Name a non metallic element that is a solid .​

Answers

Answer:

1. gold and rust

2. carbon dioxide

3. sea water

4. carbon

Answer:

1. Gold and Iron

2. Helium

3. Seawater

4.Rust

Explanation:

Can someone please explain the steps to the correct answers?

Answers

Explanation:

1. b is correct because 10^-2 is 1/100. multiplying that by 1.862 is 0.01862

2. 6 feet 10 inches = 82 inches. multiplying 82 by 2.54 we get 208.28. there are only two sig figs so it's 210 cm, not 0.21 cm.

3. 25.2 x 39370 = 992000, which is 9.92 x 10^5.

how much evaporated milk equals 1 cup of whole milk?

Answers

Answer:

1/2 cup evaporated milk plus 1/2 cup water.

Explanation:

1. One atom contains 29 protons and 34 neutrons. Another atom of the same element has a mass number of 65. How many protons and neutrons does this unknown atom have?

A. 28 protons, 37 neutrons
b. 29 protons, 36 neutrons
C. 29 protons, 35 neutrons
D. 31 protons, 34 neutrons

Answers

Answer:

b

Explanation:

because its the atom of the same element, the no of protons doesn't change but the mass number changes so we can find the mass number by:

(mass number = atomic no/no of protons + no of neutrons)

here;

mass number given = 65

and we know, no of protons = 29

let no of neutrons = x

hence,

65 = 29 + x

x= 65 – 29

x= 36

hence your answer is b

Potassium is a silvery-white, solid metal. Chlorine is a greenish-yellow gas. When these two elements react chemically, they yield potassium chloride which is an odorless salt with a crystal structure. Potassium chloride is used in the production of fertilizer.

Required:
Which part of atomic structure is responsible for the reactivity of atoms?

Answers

the number of electrons in the outermost shell deduces it’s reactivity

The electrons present in the valence shell of an atom are responsible for the reactivity of atoms.

What is an atom?

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether solid,liquid , gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Silicone is a type of synthetic compound made of silicon, oxygen, and other elements. There are many different kinds of silicone. One kind is a liquid and is commonly used as a lubricant to reduce friction between moving parts. Unlike petroleum-based lubricants, silicone is nontoxic. However, silicone is more expensive than petroleum-based lubricants.

Which of the following would silicone lubricants most likely be used for?

Answers

Explanation:

Liquid-based lubricant

Answer:

study island : food service equipment

Explanation:

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simply 5(x-y)+2(x+y) 100 POINTSPlease HELP I THINK ITS THE ANSWER I CLICKED THAT HAS A BLUE CIRCLE BUT I dont know Translate the sentence into an equation Five less than the product of 3 and a number equals 7 Use the variable b for the unknown number (8 pts)7. Solve the following system using a matrix and converting the matrix to reduced rowechelon form, without introducing any fractions.3x - 2y + 5z = -7x y + 3z = -54x + y + z = 6 Which term describes a change that occurs with no new substances being formed?A. Energy changeB. Bond changeC. Physical changeD. Chemical change 1. Why was Britain the first country toindustrialize? write 9^3 x 27^2 as a single power of 3 How many moles are in 34.6 g of sulfur oxide (SO)? If you had 10 questions on a test and you got 3 wrong what percentage is that? cris ce verbe au pass compos:J'cris. Solve the following quadratic equation for all values of x in simplest form.2(5x + 9)2 + 10 = 28 Read the quote from paragraph 9, which refers to a famous proverb.But, alas, alas! Pride goes before a fall, and the revengeful Snow turned the tables.desk.Select two quotes from the passage where this same theme is conveyed."Annoyed by what she could only see as rudeness, Amy quickly retorted, letting Jo know that she only wished she could beas fortunate as Laurie to be afforded a fraction of the money he must have spent on his horse." (paragraph 5)o the"Wanting desperately to fit in and enjoy a little luxury, Amy had indebted herself at least a dozen pickled limes." (paragraph6)khertrivialne, andn the"You are getting to be rather conceited, my dear, and it is quite time you set about correcting it. You have a good manylittle gifts and virtues, but there is no need of parading them, for conceit spoils the finest genius."" (paragraph 17)"Her mother informed her that, yes, he was quite accomplished, having been afforded an excellent education." (paragraph20)"I see. It's nice to have accomplishments and be elegant, but not to show off or get perked up, said Amy thoughtfully."(paragraph 22) nitrogen dioxide is a major component of smog which type of chemical reaction creates this product?a. synthesis reactionb. replacement reactionsc. combustion reactionsd. decomposition reaction PLS HELP ILL MArk BRAINLIEST!! what is the only continent located in all four hemispheres? Multiply. Enter your answer as a simplified mixed number. -4(3/14) Find all the numbers for each shape The distance-time graph for a vehicle standing on a road side will be Type 1 diabetes is caused by overweight or obesity. an autoimmune disorder. induced by inappropriate lifestyle choices. the most common diabetes disorder. The complete subject of the following sentence is_____, and the complete predicate is_____.Bill and Mark played ping-pong.PLZZZ HELP ME