Which of the following properties of an unknown substance would allow it to be classified as a pure substance ?
A- can be dissolved into a solution
B- has a definite composition throughout
C- combines easily with other substances
D- is made of a single element or compound

Answers

Answer 1

D because that’s the only one that makes sense

Answer 2

Pure substances typically only include one type of atom or molecule and are homogeneous in nature. The majority of these chemicals have a consistent or homogeneous makeup. Thus, option C is correct.

What is pure substance?

Elements are pure compounds that cannot be chemically broken down into less complex ones. Iron, gold, sulfur, oxygen, and oxygen are some well-known elements.

Because it cannot be converted into a more basic substance, an element is an example of a pure substance. Examples of pure substances include water, neon, and sodium chloride (NaCl) (table salt).

One element or a few related compounds make up pure substances. A kind of matter with a predictable chemical composition and physical properties is referred to as a chemical substance.

Homogeneous mixes are made up of two or more components or compounds that cannot be seen separately from one another.

Therefore, a single element or compound show properties of pure substance.

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Related Questions

A vial is filled with room temperature water, and blue cold water has been placed at the bottom. A warm water bag sits next to the vial. What do you think will happen?

Answers

Explanation:

In the context, a vial which is used in store medical samples is filled with water at room temperature. And the vial is kept on a cold water. Also a water bag containing warm water is kept near the vial.

The cold water kept at the bottom of the vial is having lower kinetic energy while warm water will have higher kinetic energy than the others. Since the water in the vial is at room temperature and it is in touch with the cold blue water, the water in the vial will loose or give its temperature to the cold blue water through conduction as well as convection process since temperature always flows from a hot body towards the cold body.

On the other hand, the warm water placed next tot he vial will give its temperature to the atmosphere.  

You and your friends were studying lists of spelling and vocabulary lists. It seemed like everyone could easily remember the first word on the list and the fifteenth word on the list. It seemed very hard to remember the words in the middle of the list. What is the hypothesis?

Answers

Answer:

you have a bad memory?

Explanation:

What neutral element has the electron configuration described by the Aufbau diagram above.​

Answers

Answer:

Aluminium.

Explanation:

The above electronic configuration can be written in a simplified form as shown below:

1s² 2s²2p⁶ 3s²3p¹

Next, we shall determine the number of electrons in the atom of the element as follow:

Number electron = 2 + 2 + 6 + 2 + 1

Number of electron = 13

Next, we shall determine the number of protons.

Since the element is in its neutral state,

The number of electrons and protons are equal i.e

Proton = Electron

Number of electron = 13

Proton = Electron = 13

Proton = 13

Next, we shall determine the atomic number of the element.

The atomic number of an element is simply the number of protons in the atom of the element i.e

Atomic number = proton number

Proton = 13

Atomic number = 13

Comparing the atomic number of the element with those in the periodic table, the element with the above electronic configuration is aluminium since no two elements have the same atomic number.

Who discovered the flame test

Answers

Answer:

Thomas Melvill

Explanation:

...

A hair gel is a mixture. Which of the following is true about hair gel?
A. A chemical change is required to separate its mixed components
B. A physical change can separate its mixed components.
C. It is made up of millions of units of a single type of compound.
D. It is made up of millions of atoms of a single element

Answers

Answer:

B. A physical change can separate its mixed components.

Explanation:

Atoms and molecules of different elements can come together to form a substance known as MIXTURE. A mixture comprises of several units of different elements or compounds that are not chemically joined together. This is the case of hair gel, which is a mixture i.e. it contains several compounds mixed together in an uneven ratio.

Since the components of a mixture such as the hair gel, are not joined together chemically i.e no chemical bonding or altering of chemical structure occurs between the mixture constituents, they can be separated using physical means. Physical methods of separation such as boiling, chromatography, etc.

HELP PLEASE!!!
what is the density of a cube that has the volume of 12mL and a mass of 6g? express in g/mL

Answers

Answer:

The density of the cube is 0.5g/mL. Hoped this helped! :)

Explanation:

V= 12.0mL                                                                D=M/V

M= 6.0g

D= 6.0g/12.0mL

D= 0.5g/mL

Which is classified as an inner transition element?
a) calcium
b) copper
c) fermium
d) helium

Answers

C) Fermium is the answer

Suppose 10 atoms of carbon (C) react with 20 atoms of oxygen (O). According to the Law of Conservation of Matter, how many atoms will there be in the product of this reaction?(1 point)
A) 20

B) 15

C) 10

D) 30

Answers

Answer:

D 30

Explanation:

whenever there is a reaction, the amount of atoms don't change, because matter can't be created or destroyed. Add the carbon and oxygen atoms together

According to the Law of Conservation of Matter, there will be 30 atoms of product in the reaction.

LAW OF CONSERVATION OF MATTER:

The law of conservation of matter states that matter can neither be created nor produced in a chemical reaction.

This further means that the amount of matter in the reactant of a reaction must equate that of the products.

Hence, if 10 atoms of carbon (C) react with 20 atoms of oxygen (O), there will be 10 + 20 = 30 atoms of product in this reaction.

Therefore, According to the Law of Conservation of Matter, there will be 30 atoms of product in the reaction.

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A metal ‘X’ has high melting point, good conductor of electricity, and is most malleable. Then the metal ‘X’ is A) Cu B) Au C) Fe D) Pt

Answers

Answer:

A) Cu

(copper)

who can answer question 7​

Answers

Potassium = Great conductor of heat and electricity.


Neon = Non reactive gas


Boron = has properties of both metals and non metals.


Barium = Malleable and highly reactive.

Which factor causes a decrease in the rate of dissolution?
decreasing the amount of solute
increasing the stirring of the solution
decreasing the surface area of the solute
increasing the temperature of the solvent

Answers

Answer:

The correct option of the first option

Explanation:

Dissolution of a solute in a solution is the process in which the solute interacts with the solvent leading to the disappearance of the solute to form a solution. Rate of dissolution is primarily affected by three factors namely

Stirring of the solution: Stirring the solution causes the solute to interact more with the solvent, thus increasing the rate of dissolution.

Surface area of the solute: The smaller the surface area of the solute, the more easier it is for it (the solute) to interact with the solvent. Hence, the smaller the surface area, the faster the rate of dissolution.

Temperature of the solvent: An increase in temperature of the solvent causes the generally causes more things to dissolve in this solvent due to increased energy of molecules in the solvent, which causes the molecules of the solute and solvent to interact more.

A decrease in the amount of solute will reduce the amount of interaction the solute (since it is in lesser quantity) have with the solvent hence the rate of dissolution will also be low (even though a solution will still be formed).

There are different factors that influences chemical equations.  The factor that causes a decrease in the rate of dissolution is decreasing the surface area of the solute.

Dissolution rate is simply known as the transfer rate of some specific drug molecules from the solid particles which is usually crystalline in nature into solution as self free drug molecules. The rate of Dissolution can be determined by the forces of the crystal.

Surface area is known to affect the rate of dissolution.  Note that When the total surface area of the solute particles is increased, the solute will then dissolves more quickly than ever.

The breaking of a solute into smaller pieces in turn do increases its surface area and increases its rate of solution and the act of stirring, do allows the solute to dissolve faster.

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If you burn a piece of wood, it becomes a different substance. What type of
property is this?
A. Electrical property
O
B. Chemical property
C. Physical property
D. Mechanical property

Answers

Answer:

B. Chemical property

Explanation:

Answer:

B

Explanation:

a reaction has taken place in which you can't get back what you started with

Suppose a mountain range is made up of 18 mountains, each mountain has
8800 trees on it, and each tree has 125,000 leaves on it.

How many leaves are
on all of the trees in the mountain range? Express your answer in scientific
notation.

Answers

The answer is 1.98 x 10^10 leaves.

18 mountains x 8800 trees = 158400 total trees

158400 total trees x 125000 leaves = 19800000000 total leaves in entire mountain range

Sci not: 1.98 x 10^10 leaves  

To do scientific notation, put the decimal place right after the first digit in the number and count how many places are behind the decimal. you'll write the number of places after the decimal after the ^ in the 10^.

The loops in Ptolemy’s model, and those shown on the video, are called motion. This phenomenon is caused by Earth’s orbit than those of other planets.

Answers

Answer:

The loops in Ptolemy’s ✔ geocentric model, and those shown on the video, are called

✔ retrograde motion. This phenomenon is caused by Earth’s

✔ faster orbit than those of other planets.

Explanation:

Answer:

✔ geocentric

✔ retrograde

✔ faster

Explanation:

¿por qué entre el calcio (Ca) que pertenece al segundo grupo y el galio (Ga) que pertenece al tercer grupo hay 10 elementos, ¿Que nombre reciben estos elementos?

Answers

Answer:

Estos elementos se denominan metales de transición, metales pesados, elementos del bloque D, etc.

Explanation:

Aquí, en esta pregunta, queremos saber la razón por la cual hay un espacio de 10 elementos entre el calcio, que es un elemento del grupo dos, y el galio, que es un elemento del grupo 3.

Al observar la tabla periódica, la tabla periódica moderna, notamos un bloque de elementos entre los elementos del grupo 2 y los elementos del grupo 3 en la tabla periódica.

Entonces, ¿por qué se colocan estos elementos entre ambos grupos? Se colocan aquí porque no pertenecen en su totalidad al grupo 2, ni tampoco al grupo 3.

Estos elementos presentan una especie de estados de oxidación variables que son responsables de una amplia variedad de propiedades comunes entre ellos.

Neutrons have a
charge?
neutral
negative
positive

Answers

Answer:

Neutrons have a neutral charge

Explanation:

A neutron consists of 3 quarks, 1 up and 2 down. The up quark has a charge of + 2/3e, and the down quarks each have a charge of - 1/3e. So, the charges on the 3 quarks tend to cancel out to produce a neutrally charged particle.

It is a Neutral charge

What volume is equivalent to 14,000 mm cubed

Answers

Answer:

14mL

Explanation:

1mL = 1cm^3, 1000mm^3 = 1000cm^3

Convert 30°C into kelvin

Answers

Answer:303.15

Explanation:

Thermal radiation emitted by objects allows us to feel infrared
energy as _____

Answers

Answer:

THERMAL IMAGING

We can sense some infrared energy as heat. Some objects are so hot they also emit visible light—such as a fire does. Other objects, such as humans, are not as hot and only emit only infrared waves.

When dealing with Atoms, what does MAN mean?

Answers

Answer:

when dealing with atoms man means man-made because man means man-made

(01.01 MC)
Which of the following could be considered a scientific statement

Answers

Answer:

hmmmm not sure and don't know

Explanation:

During dialysis, water and urea pass from the blood into the dialysis fluid. Proteins stay in the blood.
(a) Name the process by which water passes from the blood to the dialysis fluid.
(b) Describe the process you have named in (a).
(c) Explain why water passes out of blood but proteins do not.​

Answers

Answer:

Healthy kidneys clean your blood and remove extra fluid in the form of urine. They also make substances that keep your body healthy. Dialysis replaces some of these functions when your kidneys no longer work. There are two different types of dialysis - hemodialysis and peritoneal dialysis. The following is about hemodialysis.

How do researchers select a sample that is representative of its population

Answers

Explanation:

Using stratified random sampling, researchers must identify characteristics, divide the population into strata, and proportionally choose individuals for the representative sample. ... For example, individuals who are too busy to participate will be under-represented in the representative sample.

Match the scientist to his contribution to the atomic theory - Thomson - Rutherford - Bohr A. Electron energy levels B. Nucleus C. Electrons

Answers

Answer: Thomson - C

Rutherford - B

Bohr - A

Explanation: I just took the quiz

name two liquid fuels obtained from petroleum

Answers

Answer:

Diesel and kerosene.

Hope it helps :)

Answer:

Gasoline

Diesel

Kerosene

LPG

Rethanol

Ethanol

Butanol

3. The water in a beaker has a mass of 200 g. An electric current is
tumed on in the water for two hours. Afterward the water has a
mass of only 176 g. What happened to the missing mass?

Answers

Answer:

Through electrolysis, some of the water became hydrogen gas and oxygen gas

Explanation:

I just took a test on this online.

The passage of current through water results in the formation of hydrogen gas and oxygen gas. This both will evolves out and the remaining water will have lessor mass than the initial.

What is electrolysis?

Electrolysis is the process of conversion of electrical energy to chemical energy by applying an  electric field. Electrolysis involves an electrolyte which can conduct by furnishing ions.

Generally electroanalytical cells involves  two metallic electrodes which are immersed in a molten electrolyte containing the same metal ions.

When an electric  current is passed through water, it will undergo electrolysis and produce hydrogen and oxygen in gaseous state. These gases bubbles out from the water and therefore, there occurs a mass loss for water.

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If you had zinc and copper and melted it down into uranium what would happen? I will mark brainliest

Answers

Answer: Major radioactive elements (such as uranium) break down and create lead as one of ... Exposure to even small amounts of lead can be harmful since lead has no use in the body. ... of all industrial metals in the world because lead is easily re-melted and refined. ... Other metals that are found with zinc are silver and copper.

Explanation:

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Njfstubs yo f try if yo nfkkkg in dtncfuvduj

what happens during covalent bonding? ​

Answers

Answer:

The atoms share some of their outer electrons so that each atom has a stable noble gas arrangement.

Explanation:

2. A block of wood has a mass of 360 grams and a density of 60 g/cm3. What is the volume
of the block of wood?

Answers

Answer:

6cm

Explanation:

The volume of the block of wood of 360 grams has been 60 ml or 60 [tex]\rm cm^3[/tex].

The density of an object can be defined as the mass of an object per unit volume. Density plays a pivotal role in the object sinks or floats into a liquid.

If the density of an object is lighter than the density of the liquid, the object will float onto the liquid. If the density of an object is more than the density of the liquid, the object will sink in the liquid.

Density  can be given by:

Density = [tex]\rm \dfrac{mass}{volume}[/tex]

Mass of the object = 360 grams

Density = 60 g/[tex]\rm cm^3[/tex]

Volume = [tex]\rm \dfrac{mass}{density}[/tex]

Volume = [tex]\rm \dfrac{360}{60}[/tex]

Volume = 60 [tex]\rm cm^3[/tex] .

1 [tex]\rm cm^3[/tex] = 1 ml

Volume = 60 ml.

The volume of the block of wood of 360 grams has been 60 ml or 60 [tex]\rm cm^3[/tex].

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HELP PLS!!!!!!! NEED THIS IN 5 MINS

2. What kind of bond is pictured in the diagram to the left? Describe the movement of the valence electrons in the bond above? (Hint: Sharing or giving up?)

in a complete sentence pls​

Answers

Answer:

Sharing or covalent bonding is taking place.

Explanation:

The valence electron will be shared by both the atoms so that means that the election will move around both of the atoms.

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