Pure substances can be elements or compounds. An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. A compound is a substance composed of two or more different types of elements ,chemically combined in a fixed ratio. 2.(a) Elements and compounds are called as pure substances because it is made up of _________________ *

a.same kind of atoms or molecules
b. different kinds of atoms or molecules
c.heterogeneous mixtures
d.solutions​

Answer:

compounds

Explanation:

Answer:

5H²O= 23

ZnCL²= 135

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Answer:

The planet Neptune inspired the name of the element Neptunium.

Dmitri Mendeleev, who created one of the earliest periodic tables, was the source of the name of the element Mendelevium.

Electron Configuration table:-

[tex]\boxed {\begin{array}{|c|c|c|c|cccc|}\cline {1-8}\sf Element & \sf Symbol & \sf Valency & \sf{Atomic\:Number} & & \sf{Electron} & \sf Configuration & \\ \cline {5-8} &&&&\bf K&\bf L &\bf M&\bf N \\ \cline {1-8}\rm Hydrogen &\sf H & 1 & 1 & 1 &&& \\ \cline {1-8}\rm Helium &\sf He & 0 & 2 & 2 &&& \\ \cline {1-8}\rm Lithium &\sf Li & 1& 3 &2 &1 && \\ \cline {1-8}\rm Beryllium &\sf Be & 2 & 4 & 2 & 2 && \\ \cline {1-8}\rm Boron &\sf B & 3 & 5 & 2 & 3 && \\ \cline {1-8}\rm Carbon & \sf C & 4 & 6 & 2 & 4 && \\ \cline {1-8}\rm Nitrogen &\sf N & 3 & 7 & 2 & 5 && \\ \cline {1-8}\rm Oxygen &\sf O & 2 & 8 & 2 & 6 && \\ \cline {1-8}\rm Fluorine &\sf F & 1 & 9 & 2 & 7 && \\ \cline {1-8}\rm Neon & \sf Ne & 0 & 10 & 2 & 8 && \\ \cline {1-8}\rm Sodium &\sf Na & 1 & 11 & 2 & 8 & 1 &\\ \cline {1-8}\rm Magnesium &\sf Mg & 2 & 12 & 2 & 8 & 2 & \\ \cline {1-8}\rm Aluminium &\sf Al & 3 & 13 & 2 & 8 & 3 & \\ \cline{1-8}\rm Silicon &\sf Si & 4 & 14 & 2 & 8 & 4 & \\ \cline {1-8}\rm Phosphorus &\sf P & 3 & 15 & 2 & 8 & 7 & \\ \cline {1-8}\rm Sulphur &\sf S & 2 & 16 & 2 & 8 & 8 & \\ \cline{1-8}\rm Chlorine &\sf Cl & 1 & 17 & 2 & 8 & 8 &1 \\ \cline {1-8}\rm Argon &\sf Ar & 0 & 18 & 2 & 8 & 8 & 2 \\ \cline {1-8}\rm Potassium &\sf K & 1 & 19 & 2 & 8 & 8 &3 \\ \cline {1-8}\rm Calcium &\sf Ca & 2 & 20 & 2 & 8 & 8 & 4 \\ \cline{1-8} \end {array}}[/tex]

Each element is defined by its number of protons.

Answer: Hello There!....................

Lithosphere

The lithosphere is the rocky outer part of the Earth. It is made up of the brittle crust and the top part of the upper mantle. The lithosphere is the coolest and most rigid part of the Earth.

Explanation:

Mark me brainest please. Hope this helps. Anna ♥

Explanati  la materia el convino

es carbón ya irogno

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Taking into account the definition of density and change of units, if a container is strong enough to hold 62.0 pounds (lb) of gasoline, you can put 10.3184 gallons in there.  

First you must know that density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is the relationship between the weight (mass) of a substance and the volume it occupies (that same substance). Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

On the other side, the rule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.

That is, what is intended with it is to find the fourth term of a proportion knowing the other three.  

If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other (or when one magnitude decreases, so does the other) , the direct rule of three must be applied.

To solve a direct rule of three, the following formula must be followed, where a, b and c are known values ​​and x is the value to be calculated:

a ⇒ b

c ⇒ x

So, [tex]x=\frac{cxb}{a}[/tex]

The direct rule of three is the rule applied in this case where there is a change of units. To perform conversion of units from pounds to grams, you must first know that 1 lb = 453.59 g. So, if 453.59 g is 1 lb, how many grams equals 62 lb?

[tex]mass= \frac{62 lbx453.59 g}{1 lb}[/tex]

Solving:

mass= 28122.58 grams

Then, you know:

Replacing in the definition of density:

[tex]0.720\frac{g}{cm^{3} }=\frac{28122.58 g}{volume}[/tex]

Solving:

volume×0.720 [tex]\frac{g}{cm^{3} }[/tex]= 28122.58 g

[tex]volume=\frac{28122.58 g}{0.720\frac{g}{cm^{3} }}[/tex]

volume= 39059.14 cm³= 39059.14 mL= 39.05914 L (being 1 cm³= 1 mL= 0.001 L)

Now, to perform conversion of units from L to qt, you must first know that 1 qt = 0.94635 L. So, if 1 qt is 0.94635 L, how many qt equals 39.05914 L?

[tex]volume= \frac{39.05914 Lx1 qt}{0.94635 L}[/tex]

Solving:

volume= 41.2735 qt

Finally, to perform conversion of units from qt to gal, you must first know that 1 gal = 4.0000 qt. So, if 1 gal is 4 qt, how many gal equals 41.2735 qt?

[tex]volume= \frac{41.2735 qtx1 gal}{4 qt}[/tex]

Solving:

volume= 10.3184 gal

In summary,  if a container is strong enough to hold 62.0 pounds (lb) of gasoline, you can put 10.3184 gallons in there.  

Learn more about density:

The entire question says:

"A rock with a mass off 44.18 grams is dropped into a gratued cylinder. The water level in the cylinder rises from 15.20cm³ to 21.72cm³."

a) Calculate the volume of the rock.

The volume of the rock is equal the difference between the water level with the rock and the water level without the rock. That happened because when you put the rock inside the cylinder, the volume of it has been increased, and the volume of the rock is the value that increased. So, let's do this account:

[tex]V_r[/tex] is the volume of the rock.

[tex]V_r=21.72 - 15.20\\V_r = 6.52[/tex]

[tex]d=\frac{44.18}{6.52}[/tex]

Therefore, the volume of the rock is 6.52cm³

b) Calculate the density of the rock.

To calculate the density of some material, we should divide the mass of the material by its volume. Below, you can see the formula:

[tex]\boxed{density=\frac{mass}{volume} }[/tex]

Now that we know about it, it is easier to solve our question. We just do this count. The volume is 6.52cm³ and the mass is 44.18g.

[tex]d=\frac{m}{v} \\[/tex]

[tex]d=\frac{44.18}{6.52}[/tex]

[tex]d \approx 6.78[/tex]

So, the density of this rock is approximately 6.78g/cm³.

I hope I've helped. ^^

Enjoy your studies!  \o/

A scientist who is studying cancer with the goal of finding an effective treatment is doing applied research.

Applied research refers to scientific investigations that are conducted with the specific purpose of solving practical problems or improving existing technologies. In the case of cancer research, the scientist is aiming to find a treatment that can be directly applied to patients in order to combat the disease.

In contrast, pure research, also known as basic or fundamental research, is conducted to gain a deeper understanding of a particular phenomenon without any immediate practical application in mind. Pure research aims to expand scientific knowledge and explore new theories or concepts. While pure research may indirectly contribute to the development of applied research, its primary goal is to advance our understanding of the natural world.

In summary, a scientist studying cancer with the goal of finding an effective treatment is engaged in applied research, as they are conducting research with the intention of solving a specific problem and developing practical solutions for the benefit of cancer patients.

Learn more about applied research,here:

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Answer:

15 meters = 590,551 inches

Answer:

a chemical property

Explanation:

A molecule must be a pure substance hence the correct answer is " All molecules are pure substances."

A pure substance is one which contains only one element or compound. A molecule is the smallest unit of a compound that can exist independently.

When we refer to a molecule of a compound, we are referring to that pure substance that contains only the element(s) that compose the compound.

Hence; All molecules are pure substances.

Learn more: https://brainly.com/question/19922822

Answer:

you travel 100 miles in 5 gallon of gas

20 miles in 1 gallon of gas

Answer:

hydrogen peroxide is a compound

Answer: A

Explanation:

1cm=.01 so it would be 167-34

Answer:

B. 133 cm

Explanation:

34 cm = 0.34 m

1.67 m - 0.34 m = 1.33 m

1.33 m = 133 cm

Answer:

I think CH2

Explanation:

I am not so sure

C H

×

2 1

Answer:Finish What You Start Dominate Technology Know Your Enemy dress to kill

Explanation:

Answer:

sorry I don't understand this question

0.3×100cm=300cm

300cm×10mm=3000

From the diagram (see the attached image), the part of the organism that performs a function similar to the part of the cell marked with the arrow would be the brain.

The part marked with the arrow represents the nucleus of the cell.

It is then safe to infer that the nucleus of a cell and the brain of an organism are functionally similar. Hence, the part of the organism that performs a function similar to the part of the cell marked with the arrow is the brain.

More on the brain and the nucleus can be found here: https://brainly.com/question/11106069

Answer:

e. electrons and protons

Explanation:

Ions are atoms that have gained or lost electrons.

Answer:

gas pressure is caused when gas particles hit with the walls of their container the more often the particles hit with the walls and the faster they are moving when they do this the higher the pressure

Answer:

Name one very important thing that separates the Plant kingdom from all other kingdoms.

Explanation:

Answer:

the answer is b im pretty sure

Explanation:

sorry if im wrong

The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex]. The empirical formula is also known as the simplest basic formula.

A molecular formula is indeed a formula derived with molecules that corresponds to the total number of distinct atoms in the molecule of a chemical. A subscript inside a molecular formula denotes the number for each type of atoms in the substance's molecule.

The empirical formula provides the most basic formula for something like a compound, defined by the ratio between subscripts of the formula's smallest entire number of constituents. It is also known as the simplest basic formula. An empirical formula is the formula of a material given with the least integer subscript. The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].

Therefore, the molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].

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Answer:

whaen an neutal atom lose an electron and gain positive charge

Answer:

Electron configuration is the structural arrangement notation of electrons in the shells or energy levels of an atom.

Explanation:

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