Who first arranged the elements according to atomic mass ?

Answers

Answer 1

Answer:

Dmitri Mendeleev

Explanation:

In 1869, just five years after John Newlands put forward his Law of Octaves, a Russian chemist called Dmitri Mendeleev published a periodic table. Mendeleev also arranged the elements known at the time in order of relative atomic mass, but he did some other things that made his table much more successful.


Related Questions

How does quantitative data apply to the scientific method?

Answers

Quantitative data measures the aspect in the real world in quantifiable terms, numbers. Qualitative data observes the qualities of natural phenomena such as opinions and motivations.

A student measures the mass of a substance as 1.7132kg and it's volume as 0.65l. What is the density substance in g/mL? Round your answer to the correct number of significant figures

Answers

Answer:

The substance has a density of 2.636 grams per mililiter.

Explanation:

We must remember that density ([tex]\rho[/tex]), measured in grams per mililiters, is the mass of the substance ([tex]m[/tex]), measured in grams, divided by its volume ([tex]V[/tex]), measured in mililiters. That is:

[tex]\rho = \frac{m}{V}[/tex]

In addition, a kilogram equals 1000 grams and a liter equals 1000 mililiters. If we know that [tex]m = 1713.2\,g[/tex] and [tex]V = 650\,mL[/tex], then:

[tex]\rho = \frac{1713.2\,g}{650\,mL}[/tex]

[tex]\rho = 2.636\,\frac{g}{mL}[/tex]

The substance has a density of 2.636 grams per mililiter.

Please help me with this question.

Answers

Answer:

12?

Explanation:

Answer:

8

Explanation:

haploid is half

true or false

The atomic number of an element can be used to find the number of protons and neutrons in a neutral atom

Answers

true the atomic number can be used to find the number of protons and neutrons in a atom

A cylinder with 10 mL of coconut oil has a mass of 9.3 g. What is the density of the oil? Round to the nearest hundredth. ​

Answers

Answer:

0.93 grams per milliliter

Explanation:

Density is the division of mass by volume. It is how "hefty" an object is; for example, wood isn't very "hefty" but metal is. The density is measured in mass over volume, so it is 9.3/10. After applying units, it is 0.93 grams per milliliter.

And experiment a student measures the speed of a toy car locations K through N as it rolls down a ramp based on the data collected in the table exclusion was shown by the student that the unbalanced forces acting on the toy car affect its average speed what reasoning lead to the interpretation of this data and conclusion

Answers

Answer:

B) The average speed of the car increases as distance traveled increases.

Explanation:

The unbalanced forces acting on the toy car affect its average speed, The average speed of the car increases as distance traveled increases. Therefore, option A is correct.

What do you mean by an average speed ?

The term average speed is defined as the total distance traveled by the object in a particular time interval. The average speed is a scalar quantity. It is corresponded to the magnitude and does not have direction.

Average speed is calculated by dividing the total distance something travels by the total amount of time it spends traveling.

Average speed = Total distance covered / Total Time. The S.I. unit of speed is meter per second.

The unbalanced forces acting on the toy car impact its average speed, The average speed of the car increases as distance traveled increases.

Thus, option A is correct.

To learn more about the average speed, follow the link;

https://brainly.com/question/12322912

#SPJ6

Your question is incomplete, most probably your question was

And experiment a student measures the speed of a toy car locations K through N as it rolls down a ramp based on the data collected in the table exclusion was shown by the student that the unbalanced forces acting on the toy car affect its average speed what reasoning lead to the interpretation of this data and conclusion

A.The average speed of the car increases as distance traveled increases.

B.The average speed of the car decrease as distance traveled increases.

C.The average speed of the car decreases as distance traveled decreases.

D. The average speed of the car increases as distance traveled decreases.

I have no clue on what to do

Answers

Answer:

A.

Explanation

Because it is totally irrelevant to what the question is asking.

A. Is the right one I think

The most appropriate way to measure a volume of soda

Answers

Answer:

measure in cups or fluid ounces

Explanation:

Answer:

Liters

Explanation:

Trust me

The MSDS for benzene indicates that it is a clear liquid that has a substantial vapor pressure. It has a health rating of
2, a fire rating of 3, and a reactivity rating of 0. It is a cancer-causing agent.
Based on this information, which siatement about benzene is accurate?
Benzene readily reacts with moist air.
Benzene explodes if the container is shaken.
Benzene must be kept away from flames.
Benzene must be stored under high pressure.

Answers

Based on the provided information, the statement that is accurate about benzene is that it must be kept away from flames. This is because benzene has a high flammability rating of 3, which indicates that it can ignite and burn easily.

Additionally, the MSDS states that benzene has a substantial vapor pressure, which means it can easily evaporate into the air and form flammable mixtures with air.

The other statements are not accurate. Benzene does not readily react with moist air or explode if the container is shaken. It also does not need to be stored under high pressure. However, benzene is a cancer-causing agent, so it is important to handle it with care and follow proper safety precautions.

For more question on benzene click on

https://brainly.com/question/13731563

#SPJ11

Calculate the mass of oxygen needed to react 10g of calcium to form calcium oxide. 2 Ca + O2→2 CaO

Answers

Answer:

Explanation:

1122 g CaO.

I hope I helped you! :)

The mass of oxygen needed to react 10 grams of calcium to form calcium oxide is 4.0 grams.

Given:

The reaction:

[tex]2Ca+O_2\rightarrow CaO[/tex]

Mass of calcium = 10 g

To find:

The mass of oxygen needed to react 10 grams of calcium to form calcium oxide.

Solution:

[tex]2Ca+O_2\rightarrow CaO[/tex]

Mass of calcium = 10 g

Moles of calcium = [tex]\frac{10 g}{40.078 g/mol}=0.25 mol[/tex]

According to reaction, 2 moles of calcium reacts with oxygen, then 0.25 moles of calcium will react with:

[tex]=\frac{1}{2}\times 0.25 mol=0.125 \text{ mol of }O_2[/tex]

Mass of 0.125 moles of oxygen gas:

[tex]0.125 mol\times 31.998 g/mol=3.99975 g\approx 4.0 g[/tex]

The mass of oxygen needed to react 10 grams of calcium to form calcium oxide is 4.0 grams.

Learn more about the unitary method here:

brainly.com/question/2499283?referrer=searchResults

Would convection occur if Earth's mantle were a box 30 km on a side?​

Answers

Answer:

No.

Explanation:

No, convection does not occur if Earth's mantle were a box 30 km on a side because convection needs medium for the movement of heat energy from one place to another. Convection and conduction are two processes which needs medium for its movement while radiation does not need any medium for its movement. If there is a empty space present between two substances so convection does not occur.

The liquid state of matter can be described as

Answers

Answer:

The liquid state of matter is an intermediate phase between solid and gas. ... Liquids will flow and fill the lowest portion of a container, taking on the shape of the container but not changing in volume. The limited amount of space between particles means that liquids have only very limited compressibility

Explanation:

A liquid is a nearly incompressible fluid with a nearly constant volume regardless of pressure that adapts to the shape of its container. It belongs to one of the four basic states of matter.

Volume retention and conformity to the shape of a liquid's container are two of its most noticeable physical characteristics. When a liquid substance is poured into a container, it conforms to the shape of the container and will stay inside the container so long as the liquid state persists.

The intermolecular forces of attraction in a liquid state of matter are stronger than those in a gaseous state but weaker than those in a solid state.

To know more about liquid state, visit;

https://brainly.com/question/27951509

#SPJ6

2. You water three sunflower plants with salt water. Each plant receives a different

concentration of salt solutions. A fourth plant receives pure water. After a

two-week period, the height is measured.

IV

I

DV

CG

Answers

Answer:

Independent variable, is the amount of salt water received by each plant

Dependent variable, is the height of each plant

Control group, is the fourth plant that received pure water.

Note: The question is incomplete. The complete question is as follows: For the following experiments, define the independent variable (IV), dependent variable (DV) and control group (CG).

2. You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. A fourth plant receives pure water. After a two-week period, the height is measured.

Explanation:

Independent variable: An independent variable is a variable that an experimenter changes or controls and which has a direct effect on the dependent variable.

In the experiment above, the independent variable is the amount of salt water received by each plant because it is under the control of the experimenter and also is thought to have a direct effect on the height of plants.

Dependent variable: A dependent variable is a variable that is being measured or studied in an experiment, and it depends on the independent variable for its results.

The height of the plants is the dependent variable as it depends on the amount of salt water the plant receives.

Control group: The control group is the group in an experiment or study that does not receive the treatment as the other groups being studied and as such, is not influenced by the independent variable. Therefore, it is used as a standard for the other groups under study.

In this experiment, the control group is the fourth plant that received pure water.

Block A has a mass of 5g and a volume of 15mL. What is the density of block A? Will it float in water (density of water is 1.0 g/mL) Don't forget the units!! PLSSSS PLSSS PLSSS HELP I WILL MARK BRAINLIEST AND HELP WITH UR QUESTIONS I PROMISE!!!!

Answers

Explanation:

The density of a substance can be found by using the formula

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

From the question

mass of block = 5 g

volume = 15 mL

The density of the block is

[tex]density = \frac{5}{15} = \frac{1}{3} \\ = 0.33333333...[/tex]

We have the final answer as

0.33 g/mL

The block will float on water since it's density is less than that of water which is 1 g/mL

Hope this helps you

Which shell is the outermost for oxygen?
A 192
B. 292
C. 252P
D. 2P

Answers

Answer:

D is the answer

How is crystallization used in the pharmaceutical industry (simple answer please)

Answers

Answer:

CRYSTALLIZATION :IMPORTANT IN THE PHARMACEUTICAL INDUSTRY.

IT IS A SEPARATION PROCESS FOR INTERMEDIATE AND A FINAL STEP IN PHARMACEUTICAL INGREDIENTS.

A BRAINLIEST PLEEAAAASE
to obtain a saturated powder for medicine
(crushed crystals)

Plsss helpppp pls fast :(

Answers

Answer:

valance electrons are located in the outermost shell/ outermost energy levels. it determines how they will react their reactivity.

Express the following in regular notation:
3.4 x 10-1

A)O 34
B)O 0.34
C)0 3.4
D)0.00034

Answers

A because if you multiple it, you will be moving the decimal one time

How many years are in 72,000 sec?

Answers

Answer:

72000 seconds equals 20 hours.

Explanation:

why matter looks and feels different depending on the object

Answers

This is because the object has different textures which makes it feel and look different.

Answer:

because the volume

Explanation:

(a) Convert the following:
50 cm into m

Answers

Answer:

0.5m

Explanation:

Please help! If a forensic chemist discovers evidence through examination which would prove a person guilty of a crime, why then might this person not be convicted?

Answers

Explanation: You cannot be convicted of a crime without evidence. You cannot be convicted of a state crime. You cannot be convicted of a federal crime. If there is no evidence against you, under the law, it simply is not possible for the prosecutor's office to obtain a conviction at trial. So, when you do have evidence it is really impossible to not get convicted unless the judge truly believes your side of the story and declares you not guilty.

I hope this helped :) If not i'm sorry!

HELP ME WITH THIS QUESTION PLEASE
ASAP

When a cup is placed on a table, which force prevents the cup from falling to the ground?


A gravitational force

B.


normal force
с.

resistance force
D.

tension force

Answers

Answer:

B. normal force

Explanation:

When a cup is placed on a table, the forces acting on the cup are the gravitational force and the normal force. The gravitational force acts in the downward direction while the normal force acts in an upward direction. It is clear that the gravitational force is balanced by the normal force. So, the correct option is (b) " normal force ".

HELP QUICK ILL GIVE YOU BRAINLIEST AND 25 POINTS! bromine (br) has four energy levels. name 2 other elements that would have four energy levels.

Answers

Answer:

titanium and potassium

Explanation:

Answer: geranium and krypton

Explanation: hope this helps

When a substance freezes, it changes from the liquid phase to the solid phase because of its _____.

intermolecular bonding
ability to fit the shape of its container
compactness
molecular bonding

Answers

Answer:

intermolecular bonding

Explanation:

Which of the following is TRUE? *
The sun gives off solar energy which solar panels can convert into mechanical energy

A roller coaster in motion has potential energy but a roller coaster waiting at the top of a drop has kinetic energy

When we exercise we burn chemical energy, but give off thermal energy

A person on a bike uses thermal energy to pedal the bike, and potential energy helps keep the tires rotating

Answers

Answer:

I believe the answer is A

Explanation:

What is a carcinogen? a. a toxin linked to an increased risk of cancer b. a non-carbon based chemical c. a type of pollution that can be traced to a specific source d. a type of pollution that cannot be traced to a specific source

Answers

Answer:

Explanation:

a i think

Answer:

it would (a)

Explanation:

carcinogen is a substance that gives your tissues a higher chance of getting cancer

Sir Isaac Newton developed a law that describes the gravity between bodies of matter called _________________________________.

Answers

Answer:

Universal law of gravitation

What word starting with “J” was a period that dinosaurs existed within?

Answers

Answer:

Jurassic period

Hope this helps!

Who wrote the first modern chemical textbook?
O Antoine Lavoisier
O Dmitri Mendeleev
O Henry Moseley
O Johann Dobereiner

Answers

Answer:

Antoine Lavoisier

Explanation:

Antoine Lavoisier wrote the first modern textbook. It is the answer.

The modern chemical textbook was written by Antoine Lavoisier. The book is titled as Elementary Treaties On Chemistry.

Who is Antoine Lavoisier?

Antoine Lavoisier is known as the father of modern chemistry. He contributed a lot to revolutionize chemistry. Antoine Lavoisier proposed the law of conservation of mass.

Nomenclature of chemical compounds was proposed by Antoine Lavoisier. He studied about the combustion and respiration in detail and the results are written in the book Elementary Treaties On Chemistry.

Hence, the first modern chemical textbook was written by Antoine Lavoisier.

To learn more about Antoine Lavoisier, refer the link here,

https://brainly.com/question/1764419

#SPJ2

Other Questions
0Dictionaries are always prescriptive.Webster or Johnson? plz can some answer it will be appreciated Which kinds of objects emit visible light in the electromagnetic spectrum? A. all objects B. radioactive objects C. relatively cold objects D. relatively hot objects How many Ethers were in existence at launch and why? 1. 21 million because they wanted to have more units than Bitcoin 2. 72 million because they couldn't make any less 3. 72 million because they needed to raise cash for its development 4. 21 million because they needed some to use on the testnet The sum of the number of protons and neutrons in an atom is called the ________ of the element. 1. Molar Mass 2. Atomic number 3. Average atomic mass 4. Mass number o2 o4 o3 o1 Do you think natural born Americans should to take a test to show they understand American history ? When Socialism is taken to its extreme, it's called Authoritarianism. Is the following statement true or false? Select one: True False the products of 0.42 with 0.2 can be written in fraction?Yes or no and whats the right fraction i keep get it wrong I need help[tex] - 3n + 7 + 2n - 8[/tex]this is due today What was economic effect of Roman conquest? Am i right ? History is very hard 1.4.AP-9The temperature in some region of Alaska equals 12 F. Convert this temperature to Celsius.12F='c (Round to the nearest tenth of a degree as needed.) What is the freezing point of an aqueous 1.00 m NaCl solution? (Kf = 1.86 *C/m) (Assume complete dissociation of the salt.) 25 points + brainliest! ik this is the wrong subject but not much people pick to help law Pick a side (plaintiff or defense). Pick a witness ( burglar or mr king). Choose something that could be used as evidence (an object, report, footage, etc). Write a script on how you would introduce the evidence to the judge, pick a witness (the burglar or mr king) and write 3 questions using the evidence that will help your side. Is the decimal form of 19/3 a rational number? Bob and Carl each rented the same kind of moving truck from EZ Move. There was a flat rental fee plus a charge per mile that the truck was driven. Bob's cost for his truck was $112.96 for 138 miles. Carl's cost for his truck was $142.78 for 209 miles. Which equation can be used to represent the cost of the rental truck? Round to the nearest hundredth if necessary. y = 71 x minus 29.82 y = 25 x minus 66 y = 0.42 x + 71 y = 0.42 x + 55 draw a graph for x= - 4 Please help due tonight very urgent being graded need help please Tom makes $25 an hour working at the local video game store. Over the past year he has saved $150 toward a new iPhone. If the iPhone cost $300, how many hours will he need to work to be able to buy the iPhone? make an equation or inequality and solve. Show your work Johnathon is planting potatoes and carrots in hisgarden. He has 30 potato plants and 50 carrot plants.He wants to distribute the two types of plants equallyamong the rows.What is the greatest number of rows he can make? what is the mean number of points scored by these players? D A. 7 B. & DD. 10