Scientists have changed the model of the atom as they have gathered new evidence. One of the atomic models is shown below. A purple ball in the center surrounded by overlapping concentric black ovals, each with a small green ball on each of the 6 ovals. What experimental evidence led to the development of this atomic model from the one before it? A few of the positive particles aimed at a gold foil seemed to bounce back. The colors of light emitted from heated atoms had very specific energies. Experiments with water vapor showed that elements combine in specific proportions. Cathode rays were bent in the same way whenever a magnet was brought near them.

Answers

Answer 1

Answer:

A few of the positive particles aimed at a gold foil seemed to bounce back.

Explanation:

Rutherford's experiment took the search for the structure of the atom a step further. In this experiment, a narrow beam of alpha particles emitted from a source was used to bombard a thin gold foil.

The scattering of the alpha particles was detected by a movable ZnS screen. It was found that most of the alpha particles followed a straight path through the gold foil but some were scattered through large angles and some even scattered backwards.

Following this experiment, Rutherford decided on his planetary model of the atom in which the nucleus is at the core of the atom with electrons moving round the nucleus in orbits. Rutherford was awarded a Nobel prize for this work.

Answer 2

Answer:

a

Explanation:

edge 2020


Related Questions

can someone send me something to get chemistry going ;);)

Answers

Answer:

Check out libretexts chemistry

Explanation:

It's basically an online free textbook for lots of subjects

highly recommended

Ok , whenever you wanna study chemistry , listen to music that you love. So each time you have to study chem , you will be excited bc u also wanna hear that music u love. Similarly , for every boring work you do , reward yourself for it. It helps , Im sure.

Thank you XD

Which fact was most likely discovered between the time of Mendeleev’s table and the time of Moseley’s table that helped Moseley develop his version?

Answers

Answer:

The number of protons in an atom is different than the atom’s total mass.  

Explanation:

Mendeleev knew only that, with some anomalies, the properties of elements varied periodically with their atomic masses.

Moseley's X-ray experiments enabled him to remove these anomalies and to show that the properties of elements varied with their atomic numbers.  

Chadwick later discovered that the mass differences were caused by the presence of neutrons.

C12H26 has a what boiling point than C10H22. higher or lower

Answers

lower fee free to give me brainpower answer

Does Na2 gas posses metallic character? Explain your answer..​

Answers

Explanation:

It contains Na2 molecules and the atoms in this molecule are held together by a purely covalent bond because the electronegativity of the two atoms is identical.Metallic bonding would not kick in until you make clusters of quite a few atoms. Such clusters would likely not be very stable because thermodynamically the larger the clump of material the more stable it gets. So they tend to coalesce until you have chunk of metal.Metallic bonding is in a sense a form of covalent bonding, but it is very collective (delocalized over a great many atoms) and electron deficient (there are more states than electrons to fill them up with, leading to conductive properties. This means that “a metallic bond” is a bit of an oxymoron like a forest with only one tree.

Reply me in comments

Yes, Na2 gas possesses a metallic character.

Does NA contain metallic bonds?

In the stable state, metal sodium functions as an array of Na+ ions which can be surrounded by way of a sea of 3s electrons. However, it would be wrong to consider metal sodium as an ion when you consider that the ocean of electrons is shared by using all of the sodium cations, quenching the nice fee.

Sodium most effective has one valence electron. So, in metallic bonding, it is able to only donate one electron to be delocalized at some point of the structure. In steel bonding, the real bonding is the electrostatic force between the effective cations and the delocalized electrons.

Learn more about metallic bonds here: https://brainly.com/question/20536777

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What is 16.30 to the 100th gram

Answers

Answer:

1.65485688 × 10121 grams

Explanation:

Aside from those discrete items, anything like rice or flour can be measured out to make up 100 grams. For example, 1/2 cup (125 ml or about 4 and 1/2 fl. oz) of dry rice weighs very close to 100 grams.

Which of the following describes the entropy change as a solution is made
from a liquid and solid?
O A. AS = 0
O B. ASAH
C. AS< 0
D. AS> 0​

Answers

Answer:

S>O.

Explanation:

Chemical changes can reduced entropy in an open system. When gas turns into a liquid or when a liquid turns into a solid; entropy is reduced. hope this helps you :)

Cubes are three-dimensional square shapes that have equal sides. What is the density of a cube that has a mass of 12.6 g and a measured side length of 4.1 cm? (Density: D = )

Answers

Answer:

0.1828g/cm³

Explanation:

density= mass÷volume

m= 12.6g

v= 4.1×4.1×4.1 = 68.921cm³

density= 12.6÷68.921 = 0.1828g/cm³

The table describes how some substances were formed.
Substance
P.
Q
Description
Formed by boiling pure water
Formed by combining three hydrogen atoms to every nitrogen atom
Formed by adding 5 g of sugar to 1 L of water
Formed by compressing carbon under high pressure
R
S
Based on the given descriptions, which substance is most likely a mixture?
P
Q
R
S

Answers

Explanation:

Which is a pure substance?

1. soda

2. gasoline

3. salt water

4. carbon dioxide

carbon dioxide

Bromine, a liquid at room temperature, has a boiling point of 58°C and a melting point of -7.2°C. Bromine can be classified as a

1. compound.

2. impure substance.

3. mixture.

4. pure substance.

pure substance.

Answer:

the answer is

Explanation:

Sugar and water make a homogeneous mixture (the same proportions of its components throughout any given sample).

why does a desert cooler better on a hot dry day

Answers

Answer:On a hot dry day humidity will be less.when humidity decreases rate of evaporation increases

Answer:

The water that evaporates from a desert cooler takes in energy from the environment for filling up for the loss of energy during EVAPORATION making the environment cold.

Therefore, on a hot dry day, the Evaporation is more which means the environment will be colder.

Explanation:

I hope it is okay.

I learnt it last year, so I went back to my book and explained it better in my own way.

Thanks.

What is atom economy? A. All of these B. The system that determines how much 1 mole of a pure element costs. C. The measure of how much of the reactants end up as products in a chemical reaction. D. The system of exchanging electrons that occurs in atoms.

Answers

Answer:

C

Explanation:

It's the amount of products you get compared to all the reactants you use. It's kind of like economy in that it's profit, and the higher the atom economy the more products/profit you have.

Answer:

C.) The measure of how much of the reactants end up as products in a chemical reaction.

Explanation:

I got it right on founders edtell.

Why do.we need inactive ingredients?

Answers

Answer:

Inactive ingredients are components of a drug product that do not increase or affect the therapeutic action of the active ingredient, which is usually the active drug. Inactive ingredients are added during the manufacturing process of pharmaceutical products such as tablets, capsules, suppositories, and injections

156. A solid metal sphere has a volume of 4.2 ft}. The mass
of the sphere is 155 lb. Find the density of the metal
sphere in grams per cubic centimeter.

Answers

Answer:

The answer is

0.59 g/cm³

Explanation:

To find the density of the sphere we use the formula

[tex]Density \: = \frac{mass}{volume} [/tex]

To find the density in g/cm³ first convert the mass into grams and the volume into cm³

For the mass we have

155 lb = 70306.82 g

For the volume

4.2 ft³ = 118930.76 cm³

Substitute the values into the above formula

That's

[tex]Density \: = \frac{70306.82 \: g}{118930.76 \: cm³} [/tex]

We have the final answer as

Density = 0.59 g/cm³

Hope this helps you

Find the density of a cube on Earth that weighs 1.5 kg and has a side-length of 10 cm.

Answers

Answer:

1500kg/m^3

Explanation:

Formula:

d=m/v

Given:

m=1.5kg

v=1000cm^3

(The side length of a cube is always equal to the others)

Required:

d=?

Solution:

d=m/v

d=1.5kg/1000cm^3

d=1.5kg/0.001m^3

d=1500kg/m^3

Hope this helps ;) ❤❤❤

How much energy has your body used, in joules, if your health
device indicates that 450 Calories were burned during your workout? How many
Calories are in a dinner containing 3.5 x 100 joules

Answers

Answer:

1,882.8 joules83.652 calories

Explanation:

Given:

Amount in calories = 450 calories

Amount in joules = 3.5 × 100 joules

Find:

Change in joulesChange in calories

Computation:

We know that,

1 calories = 4.184 joules

So,

Amount in calories = 450 calories

= 450 × 4.184

= 1,882.8 joules

Amount in joules = 3.5 × 100 joules

=  [3.5 × 100] / 4.184

= 83.652 calories

Which feature forms at Earth's surface from the cooling of lava?
O extrusion
fault
O intrusion
unconformity

Answers

Extrusion is the feature form at Earth's surface from the cooling of lava.

What are extrusive igneous rocks?

They are the ones that originate from a sudden cooling of the incandescent magma when it comes to the surface, which means that there is no time for crystals to form, either partially or totally.

Characteristics of extrusive igneous rocks

These are rocks formed mainly by silicate minerals.

Pyroclastics are the product of explosive volcanic eruptions and contain rock fragments of different origins, they can be of many shapes and sizes.

Therefore, we can conclude that typical volcanic rocks are formed by the rapid cooling of lava and pyroclastic fragments.

Learn more about extrusive igneous rocks here: https://brainly.com/question/1340933

Answer:

A.

Explanation:

What is Mendeleev’s Periodic Law? How many elements were classified by Mendeleev?

Answers

Answer:

1.the law that the properties of the elements are periodic functions of their atomic numbers. Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.

Explanation:

2.Mendeleev’s Periodic Law states that the properties of elements are the periodic function of their relative atomic masses. Mendeleev arranged all 63 elements; which were discovered till his time; in the order of their increasing relative atomic masses in a tabular form. It is known as Mendeleev’s Periodic Table.

Chromatography
separates a solution based
on differences in how its
components ________in
different phases of matter.

Answers

Speed.
Chromatography separates several solutes by the speed the move

If you are designing an experiment, how will you determine your independent or dependent variable?

Answers

Answer:

The independent variable effects the dependent variable.

Explanation:

The independent variable Is what you change whereas the dependent variable would change because of that.

for example, the indipendent variable could be how much you water a plant in ml each day, and the dependent variable would be how tall each plant grown]s with that water doseage per day.

Which element increases its oxidation number in this reaction? 3KOH + H3PO4 → K3PO4 + 3H2O

Answers

Answer:

The answer is "no changes in oxidation number "

Explanation:

Given equation:

[tex]3KOH + H_3PO_4 \longrightarrow K_3PO_4 + 3H_2O[/tex]

In the above-given equation, there are no changes in the oxidation number which can be defined as follows but first we defined the oxidation: In the chemical process, it requires the transfer of ions is oxidation. In particular, it means that products that supply electrodes are oxidized. In the given equation, when 3Potassium hydroxide reacts with phosphoric acid it will produce potassium phosphate and 3 moles of water.

 

PLEASE PLEASE HELP!! A pipe drips at 155mL/day- convert this rate to gallons/day (1gal=3.785L)

Answers

1 mL =[tex]10^{-3}[/tex] L

so $155$ mL =$155\times10^{-3}$ L

Now, $1$ gallon = $3.785$ L , or $1$ L= $\frac1{3.785}$ gallons

so $155\times10^{-3}$ L= $155\times10^{-3}\times \frac{1}{3.785}=40.95\times 10^{-3}$ gallons

and this is for each day, so just divide by 1 (day) to get the ratw gallons/day

i.e. $40.95\times 10^{-3}$ gal/day

1.) Given 30 grams of CO2, how many moles of CO2 would you have? How many individual molecules of CO2 is that?
2., Given 22 Grams of NaCl, How many moles of Nacl would you have? How many individual molecules of NaCl is that?
3.) Given 50 grams of ammonia NH3, How many moles of NH3 would you have? How many Molecules of NH3 is that?​

Answers

Answer:

1a) .68 moles 1b)4.1E-23 molecules.

2a) .37 moles 2b) 2.27E-23 molecules

Explanation:

1a) CO2 is equal to 44 grams (C→12 grams,O→16 grams[·2]) .30g/44g is .68 moles.

1b) multiply 1A by advogadros number (6.022E-23)

2a) NaCl is 58 grams. 22/58 is .37 moles.

2b) multiply 2A by advogadros number.

you'd answer #3 the same way #1 and #2

The branch of science that deals with chemicals and bonds are called chemistry. The moles are units to calculate the quantity required to use the element.

The correct answer is mentioned below.

What are moles?The mole is the base unit of the amount of substance in the International System of Units (SI). It is defined as exactly 6.02214076×10^23 elementary entities which may be atoms, molecules, ions, or electrons.

According to the question, the moles to the option is as follows:-

moles of 30 grams of CO2 is

[tex]n =\frac{M}{M.M}\\ \\\frac{30}{44} \\\\=0.681\\\\[/tex]

The number of molecules is [tex]0.68 *6022*10^{23} =4.09496*10^{23[/tex].

2. moles of 22 grams of NaCl is

[tex]\frac{22}{44}\\ \\=0.5\\\\[/tex]

Molecules will be [tex]0.5*6.022*10^{23} = 3.011*10^{23}[/tex]

3. moles of 50-gram ammonia

[tex]\frac{50}{17} \\\\2.94\\[/tex]

The number of molecules is [tex]2.94*6.022*10^{23} = 1770*10^{23[/tex]

For more information about the moles, refer to the link:-

https://brainly.com/question/15209553

Sarah is in her chemistry lab doing an experiment. When she goes to take the mass of the chemical she is working with, she discovers that the balance is gone! Sarah knows the density of her chemical is 10 g/mL, and the volume is 5 mL. What is the mass of her chemical?

Answers

Answer:

Mass of chemical = 50 gram

Explanation:

Given:

Volume of chemical = 5 ml

Density of chemical = 10 g/mL

Find:

Mass of chemical

Computation:

Mass of chemical = Density of chemical × Volume of chemical

Mass of chemical = 10 × 5

Mass of chemical = 50 gram

Sulphur dioxide is a common pollutant from burning coal.State two effects caused by this pollutant and also write the chemical equation.

Answers

Heya!

Sulfur dioxide - ( SO2 )

Answer:

Sulfur dioxide is a common pollutant caused due to the burning of coal,Is very harmful for the environment and health.

Effects:

Health effects-Sulfur dioxide effects the respiratory system which includes the functioning of lungs,respiratory track and causes infections,can also effect  and irritate the eyes and causes aggravating conditions such as asthma and chronic bronchitis.As most sulfur dioxide air pollution comes from the burning of coal and oil in power plants. It is a emitted by trains, large ships and other diesel objects that burns alota   sulfur fuel so this also effects the environment like plants and others as the air lacks oxygen ,but with more sulfur dioxide.

Hope this helps!

Have a nice day!:)

A balloon is floating around outside your window. The temperature outside is 31 ∘C , and the air pressure is 0.700 atm . Your neighbor, who released the balloon, tells you that he filled it with 4.10 moles of gas. What is the volume of gas inside this balloon? Express to THREE signficant figures.

Answers

Answer:

the volume of gas inside this balloon = 146.3 L

Explanation:

Given that:

The temperature T = 31 °C = ( 31 + 273.15 )K = 304.15 K

The air pressure P = 0.700 atm

number of moles of gas n = 4.10 moles

Gas constant = 0.0821 L atm/K/mol

The objective is to calculate the volume of the gas inside the ballon.

Using the Ideal gas equation

PV = nRT

V = nRT/P

V = (4.10×0.0821×304.15)/0.700

V = 102.3799/0.700

V = 146.257 L

V = 146.3 L

Thus, the volume of gas inside this balloon = 146.3 L

anyone knows how to do this-

Answers

Explanation:

The number of protons in the element C^12 (Carbon) is 6, number of electrons 12 and number of Neutrons is 6, same as the number of protons it contains

C^13 has 13 electrons, 6 protons and 7 Neutrons this one's neutron number is different from proton number because it's an isotope

Na^-1 has gained an electron so the number of electrons it has = 24 and the number of protons shown as 11 which means there are 23 - 11 = 12 Neutrons

O^-2 has gained two electrons and got 18 electrons in total, 8 protons and 8 neutrons

how scientific inferences can be made from scientific observations

Answers

Answer:

The scientific method is applied to inference through the steps taken to make both inductive and deductive inferences. Inductive inference begins with an observation, and then a pattern of such observation develops. One then makes a hypothesis based on the pattern and finally a theory based on the hypothesis

Hope it helps!

Mark it as Brainliest!!

What does light travel in?

Answers

Answer:

Light travels as a wave.

Explanation:

But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)

Light speed is fastest

Which are the physical properties of water

Answers

Liquids and gas ex. Ponds, rain, vapor

Ravi’s grandmother is suffering from diabetes. Her doctor advised her to take lassi with less fat content. Which of the following methods would be most appropriate for Ravi to prepare it? OPTIONS: a. Filtration b. Decantation c. Churning d. Sedimentation

Answers

Answer:

Explanation:

Hello friend

The answer is Churning.

Hope this helps

plz mark as brainliest!!!!!!

how many primary carbon are in 2,3 dimethylpentane​

Answers

Answer:

There are 7 carbons in 2,3 dimethylpentane

Explanation:

Because 2,3-dimethlypentane is an organic compound of carbon and hydrogen with formula C7H16

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