Who invented the Periodic table? And why Periodic tables are useful?

Answers

Answer 1

Answer:

It also helps them understand how life works. It even helps them predict how new materials will behave. In 1869, Dmitri Mendeleev, a Russian chemist, proposed the periodic law and his first periodic table. He published this periodic table two years later in a textbook, The Principles of Chemistry.

Explanation:

Answer 2

Answer:

Dmitri Mendeleev, To summarize, the periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one easy-to-use reference. The table can be used to predict the properties of elements, even those that have not yet been discovered

Explanation:I have already done this


Related Questions

Identify the goal of any scientific method

Answers

Answer:

Explanation:

Forming a testable hypothesis

Devising a study and collecting data

Examining the data and reaching conclusions

Reporting the findings of the study

The goal of any scientific method is to solve a problem odor to better understand an observed event.

Magnesium nitrate, magnesium hydroxide and magnesium carbonate all decompose when heated.
Which statement about these decomposition reactions is correct?
A. Magnesium carbonate decomposes to release carbon dioxide and oxygen
B. Magnesium hydroxide decomposes to release hydrogen and oxygen
C. Magnesium hydroxide decomposes to release water vapour
D. Magnesium nitrate decomposes to release oxygen only​

Answers

Answer:

C

Explanation:

The reactions:

[tex] \mathrm{Mg(NO_3)_2 \longrightarrow MgO+ 2NO_2 +O_2}\\

\mathrm{Mg(OH)_2 \longrightarrow MgO + H_2O}\\

\mathrm{MgCO_3 \longrightarrow MgO +CO_2}[/tex]

Is your prediction supported by the membrane potential chart? Explain your answer.

Answers

Answer:

Yes, it is. The chart shows that the initial charge of the neuron is negative. When the neuron is stimulated, sodium ions enter the cell. So, the voltage inside the cell changes to positive. When potassium ions move outward, the voltage decreases until it reaches its previous state.

Explanation:

answer on edmentum

pls help!!
will give the brainliest
plz answer correctly
Urgent!!!​

Answers

Answer:

for number 2

Explanation:

Hydrogen. Hydrogen ignites in air. If hydrogen is present in a test tube, a lighted splint held near its mouth ignites with a squeaky pop.

Mg(s) + 2HCL(aq) ———->MgCl2 (aq) + H2 (g)
TEST: use a burning splint
If hydrogen is present it will burn with a pop sound.
C) Copper
D) Iron

calculate the percentage by mass of chlorine in Cobalt (II) chloride (cocl2)​

Answers

Explanation:

Divide the mass of chlorine by the molar mass of cobalt chloride, then multiply by 100.

Molar Mass of Cobalt Chloride.

Mass of Chlorine in Cobalt Chloride.

Percent Composition of Chlorine.

Divide the mass of chlorine by the molar mass of cobalt chloride, then multiply by 100.
Molar Mass of Cobalt Chloride.
Mass of Chlorine in Cobalt Chloride.
Percent Composition of Chlorine.
Mar 16, 2016

Using the line graph below, find the independent and dependent variables.

I'll give brainliest.

Answers

Day of the week: Independent. Number of push ups: depended ;)

calculate the number of moles equivalent to 25.0 gram of copper II sulfate pentahydrate [CuSO4 5H2O]​

Answers

Answer:

The answer is 0.1 mol

Explanation:

To calculate the number of moles in the given substance we use the equation

[tex]n = \frac{m}{M} [/tex]

where

n is the number of moles

M is the molar mass

m is the mass of the substance

To calculate the number of moles we must first find the molar mass

That's

M( CuSO4 5H2O )

Cu = 64 , S = 32 , O = 16 H = 1

So we have

M( CuSO4 5H2O ) = 64 + 32 + (16 × 4) +

5( 2 + 16)

M( CuSO4 5H2O ) = 96 + 64 + 5(18)

M( CuSO4 5H2O ) = 160 + 90

M( CuSO4 5H2O ) = 250 g/mol

M( CuSO4 5H2O ) = 250 g/mol

mass of CuSO4 5H2O = 25 g

Substitute the values into the above formula

That's

[tex]n = \frac{25g}{250 \: g/mol} [/tex]

We have the final answer as

n = 0.1 mol

Hope this helps you

[tex] \LARGE{ \boxed{ \blue{ \rm{Answer}}}}[/tex]

☃️ Chemical formulae ➝ [tex]\sf{CuSO_4.5H_2O}[/tex]

How to find?

For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.

[tex] \boxed{ \sf{No. \: of \: moles = \frac{Given \: weight}{Molecular \: weight} }}[/tex]

Solution:

Atomic weight of Elements:

Cu = 64S = 32O = 16H = 1

❍ Molecular weight of [tex]\sf{CuSO_4.5H_2O}[/tex]

= 64 + 32 + (16 × 4) + 5(2 × 16)

= 96 + 64 + 90

= 250 g/mol

❍ Given weight: 25 g

Then, no. of moles,

⇛ No. of moles = 25 g/ 250 g mol‐¹

⇛ No. of moles = 0.1 moles

⚘ No. of moles of Copper Sulphate pentahydrate in the given weight = 0.1 moles.

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The study of such concepts as motion, force, energy, matter, heat, sound, light, and the components of atoms is:​

Answers

Answer:

chemistry

Explanation:

It is Physics because in chemistry we study about kinds of chemicals but in physics we learn about motion , sound, light , etc

What is the difference between data and evidence???
Helpppp! I will give brainliest! PLSSS!

Answers

Data is just data and has no intrinsic meaning on its own. Evidence has to be evidence for or of something; an argument, an opinion, a viewpoint or a hypothesis. The evidence you use depends on your argument.
Data is calculated and evidence is pre existing

Which of the following reactions are possible if sodium is more reactive than aluminum, 3 iron, and lead?
Reaction I: Sodium + Aluminum chloride →Sodium chloride + Aluminum Reaction II: Sodium chloride + Iron → Iron chloride + Sodium
Reaction III: Sodium + Lead chloride → Sodium chloride + lead

Answers

Answer:

Reaction I: Sodium + Aluminum chloride →Sodium chloride + Aluminum

Explanation:

Sodium being more reactive means that it will take the place of aluminium in whats called a displacement reaction and form.

Sodium chloride + Aluminum

Hello, sorry but I can’t answer because the answer is above. But I really need to ask a question so I need to answer one :((

(Pls Help) The study of such concepts as motion, force,y energy, matter, heat, sound, light, and the components of atoms is:
- Physics
- Biology
- Earth Science
- Astronomy​

Answers

Answer:

It is Physics

because these are all physical components and/or characteristics

-Biology is the study of life

-Earth science is the study of the biosphere we live in

-Astronomy is about space

Answer:

Physics

Explanation:

Physics is the study of motion and force...

Biology is the study of life

Earth Science is wind, water and uk...

Astronomy is about planets and stars

Organisms can either be made of one cell or made of more than one cell

Answers

Answer:

The statement is true.

Explanation:

Organisms can be unicellular (made up of one cell) or multicellular (consisting of more than one cell).

I hope this helps in any way :)

Unicellular organisms are made up of only one cell that carries out all of the functions needed by the organism, while multicellular organisms use many different cells to function. Unicellular organisms include bacteria, protists, and yeast.

The ideal gas law is a combination of all the gas laws and states that PV = nRT. The value of n stands for
A. volume.
B. mass.
C. molecular mass
D. moles.

Answers

Answer:

d

Explanation:

p is pressure, v is vo;lume, t is temperature, r is ideal gas contstant, therefore n is the moles

D Bc the combination is the move for the reaction

What type of energy is associated with this movement of the molecules?

Answers

Answer:

electric

Explanation:

Thermal energy,
or heat energy
( same thing)

is the energy that comes from the movement of atoms and molecules in a substance. Heat increases when these particles move faster.

i need help asap. any help is appreciated.

the diagram shows an electrochemical cell with copper (left) and zinc (right) strips.

**Label all parts (1-9), including the solutions in each beaker and the connecting tube
**Label which cell is the cathode and which cell is the anode include the charge on each strip
**Show, or describe in detail, the flow of electrons
**Describe what type of electrochemical cell is pictured. Explain how the cell works Include the oxidation the oxidation half-reacions in your explanation

Answers

Answer:

Explanation:

1- Cathode 2- copper electrolyte solution usually (CuSO4) 3- Cu half cell 4- bulb (when lighted, shows the current is flowing) 5- Zn half cell 6- Zn electrolyte solution 7- connecting wires 8- anode (Zn) 9-salt bridge

2- the copper-(Cu) electrode is the cathode and the zinc-(Zn) electrode will be the anode. This is because the cathode is negatively charged (while Cu is positively charged, so it attracts) and the anode is positively charged (while Zn will be negative)

3- the electrons flow from the anode, where oxidization takes place, to the cathode, where reduction reactions take place.

That's the best i can do. Hope it helps.

Answer:

Explanation:

• Label all parts (1–9), including the solutions in each beaker and the connecting tube.

1. Copper strip

2. Cu2+(aq) (copper electrolyte solution or copper nitrate)

3. Cathode compartment  

4. Light bulb  

5. Anode compartment  

6. Zn2+ (aq) (zinc electrolyte solution or zinc nitrate)  

7. The connecting wires or the external circuit  

8. Zinc strip  

9. Salt bridge  

• Label which cell is the cathode and which cell is the anode. Include the charge on each strip.

The copper strip is the cathode and the zinc strip is the anode. The anode is positively charged and the cathode is negatively charged. This is because the cathode attracts a positive charge and the anode attracts a negative charge.  

• Show, or describe in detail, the flow of electrons.

The atoms from the zinc strip are oxidized into zinc ions, (the anode is where oxidation occurs). The electrons in the anode then travel through the wire to the copper strip. The electrons then merge with the copper ions in the solution creating copper metal (the cathode is where reduction occurs).  

• Describe what type of electrochemical cell is pictured. Explain how the cell works. Include the oxidation and reduction half-reactions in your explanation.  

This is a voltaic or galvanic cell. It works by using spontaneous oxidation-reduction reaction to generate electricity.  

Zn(s) --- Zn2 + (aq) + 2e-  

Cu2 + (aq) + 2e- --- Cu(s)

Explain what a limiting reactant is and describe the process to determine the limiting reactant in the example listed below: Given 3.4 grams of x compound with a molar mass of 85 g and 4.2 grams of y compound with a molar mass of 48 g How much of compound xy can be generated 2x + y2 = 2xy

Answers

Answer:

4.36g XY

I hope it helps!

4.36g!!!!!!!!!!! Did the math on paper!

A piece of unknown metal weighs 500 g. When the piece of metal absorbs 6.64 kJ of heat, its temperature increases from 25°C to 78°C. What's the specific heat capacity
of this metal?
A. 13 J/gºC
B. 0.25 J/gºC
C. 25 J/gºC
D.2.5 J/g °C

Answers

6.64×1000÷(78-25)×500=0.25 g/k

Answer:

6.64×1000÷(78-25)×500=0.25 g/k

calculate the number of moles equivalent 10.0 gram of aluminium carbonate ​

Answers

[tex] \LARGE{ \boxed{ \red{ \rm{Answer}}}}[/tex]

☃️ Chemical formulae ➝ [tex]\sf{Al_2(CO_3)_3}[/tex]

How to find?

For solving this question, We need to know how to find moles of solution or any substance if a certain weight is given.

[tex] \boxed{ \sf{no. \: of \: moles = \frac{given \: weight}{molecular \: weight} }}[/tex]

Solution:

❍ Molecular weight of [tex]\sf{Al_2(CO_3)_3}[/tex]

= 2 × 27 + 3 × 12 + 9 × 16

= 54 + 36 + 144

= 234

❍ Given weight: 10 g

Then, no. of moles,

⇛ No. of moles = 10 / 234

⇛ No. of moles = 0.0427 moles

⚘ No. of moles of Aluminium carbonate in the given weight = 0.0427 moles.

━━━━━━━━━━━━━━━━━━━━

ok it’s gonna be the c= 12

Which reaction is typical neutralization reaction? H+ (aq) + OH- (aq) = H2O (g) NaCl (aq) +AgNO3(aq) = AgCl (s) + NaNO3(aq) CuO(s) +H2SO4(aq) = CuSO(4) + H2O(l) NH3(l) +H2SO4(aq) = (NH4)2SO(s)

Answers

Answer:the third

Explanation: because neutralization reaction result salt and water

What makes a good scientific question???
Plsss help! I will give brainliest! :)

Answers

Answer:

A good question is testable,  detailed, measured, and controlled.

Just let me know if you have any other questions.

Details, control and measurements.

9 different lab rules Explain how students will do a safe lab

Answers

Answer:

Report all accidents, injuries and breakage of class or equipment to instructor immediately.Keep pathways clear by placing extra items on the shelves or under the work tables. If under the tables make sure that these items can no be stepped on.Long hair (chin-length or longer) must be tied back to avoid catching fire.Wear sensible clothing including footwear. Loose clothing should be secure so they do not get caught in a flame or chemicals.Work quietly - know what you are doing by reading the assigned experiment before you start to work. Pay close attention to any cautions described in the laboratory exercises.Do not taste or smell chemicals.Wear safety goggles to protect your eyes when heating substances, dissecting, etcDo not attempt to change the position of glass tubing in a stopper.Never point a test tube being heated at another student or yourself. Never look into a test tube while you are heating it.

Hope this helps:))

Please mark me as Brainliest.

1. Wear equipment at all times when doing procedures.
2. If something breaks step away and do not try to fix it
3. Do not smell or eat the chemicals it is very dangerous
4. Do not put anything up to your eye.
5. Make sure you do not wear something loose so it does not interfere with anything.
6. Do not run or anything with testing tubes.
7. Pay close attention when doing something with chemicals, you do not want to go wrong or explore something up.
8. If glass breaks or something goes wrong, such as accidents or injuries tell the teacher.
9. Do not take off anything you are suppose to wear in class, such as safety goggles, also do not try to mess with chemicals.

Please help with questions 11-13! I’ll give brainliest

Answers

Answer:
11- 3
12- 4
13- 2
Answer:
11- 3
12- 4
13- 2 hope this helps

Which two objects in space formed from the huge disk of ice and debris beyond the outer planets?


Answers

Answer:

Pluto and Comets! I hope this helps you!

Pluto and comets i love science btw keep working hard!!!

Examine the assumption. Assumption: The Earth is flat. Which statements accurately describe how the assumption affects scientific thinking? (Select all that apply. People think the Earth is flat, so they think that the Earth does tilt on its axis while revolving around the Sun. People think the Earth is flat, so they think that it is only safe to travel certain distances from a given location. People think the Earth is flat, so they think that when the Sun sets, it goes underneath the Earth. People think the Earth is flat, so they think that when traveling in a straight line, there is no end.

Answers

Answer:

The statements that accurately  describe how the assumptions affects scientific thinking are;

People think that the Earth is flat, so they think that it is only safe to travel certain distances from a given location.

People think that the Earth is flat, so think that when the Sun sets, it does underneath the Earth

Explanation:

The proof that the Earth is round was made by the Greek philosopher, Aristotle, over 2,000 years ago, by observation of the change in the constellation of the stars as a person changes his position North or South

The initial belief was that the Earth is flat disc surrounded by water, while the it was believed that the shape of the Earth was that of a square with four mountains at the vertices that support the sky from falling.

the statements are the answer are the problem to

Given the connection between Aw and K (Aw=2k) could you use the ideal gas law and derive the Boltzmann constant. Water freezes at 546.3 Aw and absolute zero is at 0 Aw. (Aw is an arbitrary temperature scale.)

solved, divide boltzmann constant by 2

Answers

Answer:

tails of comets

the ionosphere

a neon sign

Explanation:

Suppose you spill a chemical on yourself:

a. What information can your teacher provide for you concerning that chemical?

b. Where is the information located?

Answers

They can tell you what will stop that chemical from doing damage and it should be located in the front of the class where you can see it
a. how a chemical can affect you. say it can give you a rash. they should tell you how to help it. how to properly get the chemical off without mixing any chemicals that can make it worse.

b. in the front of the class. or the back

Glucose has formula C6 H12 O6.
Calculate the number of Oxygen atoms present in 18 g of glucose​

Answers

Explanation:

this may help u follow me and mark as brainlist PlZzzzz

Approx.
1
10

m
o
l
×
24

atoms

m
o
l

1
×
N
A
,
where
N
A
=
6.022
×
10
23

m
o
l

1
.
Explanation:
We take the quotient.....
Number of moles
=
Mass of substance

g
Molar mass

g

m
o
l

1
=
Mass of substance

g
Molar mass

g

m
o
l

1
=
1
1
m
o
l
=
m
o
l
And thus we get an answer with dimensions of
m
o
l
as we require...
And so we retake the quotient.......
Number of moles of glucose
=
18

g
180.16

g

m
o
l

1
=
?
?

m
o
l
.
We know that glucose,
C
6
H
12
O
6
, has a formula of
180.16

g

m
o
l

1
, i.e.
(
6
×
12.011
+
12
×
1.00794
+
6
×
16.00
)

g

m
o
l

1
=
?
?

g

m
o
l

1
......
We are not finished there, because we were asked to find the number of atoms in such a molar quantity, and there are 24 atoms in one molecule of glucose.
And so we multiply the molar quantity by number of atoms per mole, and then by Avogadro's number to get the number of atoms,
18

g
180.16

g

m
o
l

1
×
24

atoms

m
o
l

1
×
N
A
18

g
180.16

g

m
o
l

1
×
24

atoms

m
o
l

1
×
6.022
×
10
23

m
o
l

1
=
?
?

What is the molar mas of zinc (Zn)? 6.02 g/mol 30.0 g/mol 48.7 g/mol 65.38 g/mol

Answers

It's in the periodic table.

See the attached picture. The number below 'Zn' is the molar mass. The closest answer choice is 65.38

Molar mass is defined by the ratio of the mass to the moles. The molar mass of zinc (Zn) in the periodic table is said to be 65.38 g/mol. Thus, option D is correct.

What is molar mass?

Molar mass is the mass of the element or the compound in one mole of the given substance. It is denoted in units gm/ mol. The units come from the ratio of mass in grams to the moles in mol.

It is used to calculate the amount of the substance present in the mole of the substance and can be expressed as particles, like ions, or molecules with the help of Avogadro's number.

The molar mass or the atomic mass of the zinc element is denoted in the periodic table. The mass is written on the lower side of the element symbol.

Therefore, the molar mass of zinc (Zn) is 65.38 g/mol.

Learn more about molar mass here:

https://brainly.com/question/27669728

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How is the definition of the word theory different in science versus in everyday life?

A. In everyday speech a theory is the same as a hypothesis-a statement that has (been) tested. In science a theory is a synthesis of a large body of verified information

B. In everyday speech a theory is the same as a hypothesis-a statement that has ( not been) tested. In science a theory is a synthesis of a large body of verified information

Answers

Answer:

The second option is correct.

In everyday speech a theory is the same as a hypothesis-a statement that has ( not been) tested. In science a theory is a synthesis of a large body of verified information. The correct option is B.

What is a hypothesis?

A hypothesis is an explanation proposed for a phenomenon. The scientific method requires that a hypothesis be testable in order for it to be considered a scientific hypothesis.

Scientists typically base scientific hypotheses on previous observations that cannot be adequately explained by existing scientific theories.

It aids in providing a link between the underlying theory and the specific research question.

It aids in data analysis and assesses the research's validity and reliability. It serves as a foundation or proof of the research's validity.

A theory is the same as a hypothesis in everyday speech—a statement that has (or has not been) tested. A theory in science is a synthesis of a large body of verified information.

Thus, the correct option is B.

For more details regarding hypothesis, visit:

https://brainly.com/question/13025783

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How is science different from other ways of learning about the world??? PLSS HELPP ASAPPP! :)

Answers

Answer:

Science does not change across region.

Explanation:

Regardless of language barriers or methods of learning, science is the study of fundamental concepts that explain how our world and the universe works.

It’s stating the actual facts based off nature planet world chemicals not based off “historic myths” or numbers
Other Questions
The head of a computer science department is interested in estimating the proportion of students entering the department who will choose the new computer engineering option. Suppose there is not information about the proportion of students who might choose the option. What size sample should the department head take if he wants to be 95% confident that the estimate is within 0.10 of the true proportion meaning of make fun of Are the ratios 6:3 and 2:1 equivalent? On January 1, Year 1, St. Clair Corporation issues 7%, 11-year bonds with a face amount of $90,000 for $83,497. The market interest rate is 8%. Interest is paid semiannually on June 30 and December 31. Complete the necessary journal entry for the issuance of the bonds by selecting the account names from the drop-down menus and entering the associated dollar amounts. Plz ans ASAP! Tysm! Pzlllzzz! ABC paid $2,000 interest on short-term notes payable, $10,000 interest on long-term bonds, and $6,000 in dividends on its common stock. ABC would report cash outflows from activities, as follows:A) Operating, $12,000; Financing $6,000.B) Operating, $0; Financing $18,000.C) Operating, $18,000; Financing $0.D) Operating, $2,000; Financing $16,000. Bill spent $42 on fruit at the grocery store. He spent a total of $60 at the store. What percentage of the total did hespend on fruit? Attestation standards apply when a CPA is engaged to issue a practitioners report on A preparation service. The subject matter of a compilation. An examination after performing agreed-upon procedures. A review of an assertion about subject matter that is the responsibility of another party. PleaseHelp me asap!! pamela is 8 years older that jiri. the sum of their age is 102. What is jiris age? What is 10+x-15-3x please __________ is associated with a person who is crafty or understands right/wrong behavior but uses tricks to obtain an unfair advantage. Calculate:a) QR b) PS c) The area of quadrilateral PQRS uban missile crisis resulted in all of the following except a U.S. agreement to abandon the American base at Guantanamo. b an ambitious program of military expansion by the Soviet Union. c a U.S. promise not to invade Cuba. d the removal of Nikita Khrushchev from power in the Soviet Union. Youve been contracted to wallpaper a wall 10 feet wide and 12 feet high with a square window with 3 foot sides. How many square feet of wallpaper do you need to cover the wall if you were to exclude the opening for the window? _____ square feet Musah stands at the center of a rectangular field.He takes 50 steps north,then 25 steps West and finally 50 on a bearing of 315. Sketch Musah's movement How far west is Musah's final point from the center? How far north is Musah's final point from the center? The value of which of these expressions is closest to e?3331B.O A. (1-5+39)(1+0)(1+3)32C.134D. You wish to construct a galvanic cell with the anode consisting of a Ni electrode in a 1.0 M Ni(NO3)2 solution. What would be the highest standard cell potential if used as the cathode in this galvanic cell? Why are G protein only found in Eukaryote cell ? Fiona wrote the linear equation y = y equals StartFraction 2 over 5 EndFraction x minus 5.x 5. When Henry wrote his equation, they discovered that his equation had all the same solutions as Fionas. Which equation could be Henrys? x x minus StartFraction 5 over 4 EndFraction y equals StartFraction 25 over 4 EndFraction.y = x x minus StartFraction 5 over 2 EndFraction y equals StartFraction 25 over 4 EndFraction.y = x x minus StartFraction 5 over 4 EndFraction y equals StartFraction 25 over 2 EndFraction.y = x x minus StartFraction 5 over 2 EndFraction y equals StartFraction 25 over 2 EndFraction.y =