What i
Chemistry:
Collect information regarding periodical development of fundamental
particles and structure of atom with different atomic models and display
then information Chart.
Answers
Answer:
Periodical development of fundamental particles and structure of atoms can be explained from different atomic models .
Explanation:
Periodical development of fundamental particles :
About 2600 years ago an Indian sage called kanada proposed that all forms of matter are composed of very small particles called as Anu and each Anu is made up of smaller particles called Parmanu .
Later Greek philosopher Democritus called these atoms and according to him atoms are indivisible and indestructible .
John Dalton's theory describes elements in terms of atoms which he believed to be indivisible particles.But Later John Dalton's postulate which suggests that atom is indivisible is disproved by various experiments conducted by various scientists :
1. Electron - J.J Thomson discovered the electron while experimenting with cathode rays in 1897.
2. Proton - Proton was discovered by Gold stein in 1920.
3. Neutron was discoverer by James Chadwick in 1932 by bombardment of alpha particle at beryllium . Structure of atom :
J.J Thomson atomic model : After the discovery of electrons ; he proposed his plum and pudding model which shows that electrons are embedded throughout the positively charged material.Rutherford alpha particle scattering experiment : This experiment lead to the discovery of nucleus . According to this experiment all the positive charge and most of the mass of atom is concentrated in a small core called nucleus . According to this model nucleus is composed of neutrons and protons . Electrons are distributed around the nucleus and occupy most of the volume. Bohr atomic model : Bohr modified Rutherford atomic model of atom by suggesting that electrons move in specific energy levels around nucleus.Schrodinger's model of atom : This model is most precise model and is used in present days . According to him electrons are present in a particular region or space around the nucleus called as orbitals where probability of finding the electrons are more.
Related Questions
P.S. This is a science question not a chemistry.
When the tilt of the Earth causes the sun’s energy/light to be spread out over a larger area, temperatures are ____________ causing ____________ to occur.
A. the same, Spring
B. warmer, Summer
C. cooler, Winter
Answers
Answer:
B) When the tilt of the Earth causes the sun’s energy/light to be spread out over a larger area, temperatures are ______warmer______ causing _____Summer_______ to occur.
Which of the following is true about the behavior of an organism?
A.
The behavior of an organism is influenced only by the traits it inherits from its parents.
B.
The behavior of an organism is influenced only by the environment in which it lives.
C.
The behavior of an organism is not influenced by either its heredity or its environment.
D.
The behavior of an organism is influenced by both its heredity and its environment.
Answers
Answer:
C. The behavior of an organism is not influenced by either its heredity or its environment.
Do the molecules of a liquid have (more, less, or the same) freedom of movement as the molecules of a gas? *
Answers
Reasoning: The molecules of a liquid are closer together and they are constantly running into each other, limiting their freedom of moment.
An oxide of trivalent metal contains 32% of oxygen. Calculate the atomic mass of the metal.
Answers
The atomic mass of the metal.(M) = 51 g/mol
Further explanationGiven
32% of oxygen
Required
the atomic mass of the metal.
Solution
An oxide of trivalent metal : M₂O₃(Ar O = 16 g/mol)
The molar mass of metal oxide = 2M+16.3=2M+48
32% of oxygen, then :
32% x 2M+48 = 48
0.32(2M+48)=48
0.64M+15.36=48
0.64M=32.64
M=51
What does the "129" represent in the following notation? *
Te-129
Answers
Te-129
How many magnesium bromide formula units are there in 1.5 moles of MgBr2
Answers
Answer: The answer is 0.0054314469917931, I'm pretty sure.
The empirical formula of the compound is called the formula unit in chemistry. In 1.5 moles of magnesium bromide, [tex]9.03\times 10^{23}[/tex] formula units are present.
What are moles and formula units?Moles are the measuring units of the molecules, atoms, and other particles of the chemistry. Formula units of any substance can be estimated as the product of the moles and the Avogadros number.
The number of the moles present of the magnesium bromide is 1.5 mol and the value Avogadro number is [tex]6.02 \times 10^{23}.[/tex]
If 1 mole of the substance contains [tex]6.02 \times 10^{23}[/tex] formula units, then, formula units in 1.5 moles are:
[tex]\begin{aligned} & = 1.5 \times 6.02 \times 10 ^{23}\\\\& = 9.03 \times 10^{23} \end{aligned}[/tex]
Therefore, [tex]9.03 \times 10^{23}[/tex] formula units are present in 1.5 moles of magnesium bromide.
Learn more about formula units here:
https://brainly.com/question/836231
PLEASE HELP!!
Ecosystem services are benefits that healthy, diverse ecosystems provide to humans. List some ecosystem services provided by a healthy biodiversity on Earth and describe how our lives would be changed without these.
Answers
Answer:
Ecosystem services are indispensable to the wellbeing of all people, everywhere in the world. They include provisioning, regulating, and cultural services that directly affect people, and supporting services needed to maintain the other services.
Ecosystem provides water and air which are essential for survival on earth without the presence of these essential things life on earth could not exist.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/19267717
#SPJ2
A change in the external or internal environment of an organism is known as
Answers
Answer:
A stimulus is a change in the internal or external environment. A receptor detects a stimulus.Which of these statements is true?
A Rocks can only change on the earth's surface
B Rocks can change from one type to another
C Rocks can only change inside the earth
D Rocks never change
Answers
Answer:
B
Explanation:
What is the probability of a
short plant in the cross
between a Tt and a tt plant?
Answers
Which of the following is an element?
A.
magnesium chloride salt (MgCl)
B.
hydrochloric acid (HCl)
C.
carbon monoxide gas (CO)
D.
zinc metal (Zn)
Answers
Answer:
zinc metal (ZN) is an element
1. Compare atoms, molecules, compounds.
Answers
Answer: Molecules contain two or more atoms and are held together by covalent bonds, whereas compounds are held together by ionic bonds. Two or more elements bonded together through ionic attraction. Compounds contain two or more atoms and are held together by ionic bonds, whereas molecules are held together by covalent bonds.
Explanation:
All can change the Earth slowly and gradually except
A. erosion
B. weathering
C. melting rock
D. earthquake
Answers
Answer:
D. Earthquake
Explanation:
I think earthquake because the question is asking for SLOW changes and an earthquake is kind of a sudden change...so yeah.
Hope this helps :D
The balanced chemical equation below shows the combustion reaction of butane (C₄H₁₀). What is the mole ratio of butane (C₄H₁₀) to carbon dioxide (CO₂)? *
[tex]2C_{4}H_{10} + 13O_{2} --\ \textgreater \ 8CO_{2} + 10H_{2}O[/tex]
2:8
13:8
13:10
1:5
Answers
What is one of the functions of the nucleus?
A.
to remove waste products from a cell
B.
to contain the genetic information of an organism
C.
to determine what materials can enter or leave a cell
D.
to provide structural support for a plant cell
Answers
Answer:
B.
to contain the genetic information of an organism
Explanation:
The nucleus controls and regulates the activities of the cell (e.g., growth and metabolism) and carries the genes, structures that contain the hereditary information. Nucleoli are small bodies often seen within the nucleus.
Which formula can be used to calculate the molar mass of water (H2O)?
Answers
Answer:
One mole of H2O is made up of 2 moles of Hydrogen atoms and 1 mode of Oxygen atom. Mass of two moles of Hydrogen atoms = 2x1 g/mol. Mass of one mole of water = 2 g/mol + 16 g/mol = 18/ mol.
Explanation:
I majored in Chemistry
What is a by-product of a nuclear power plant?
Answers
Answer:
There are four categories of byproduct material: Radioactive material that results from the fissioning, or splitting apart, of enriched uranium or plutonium in nuclear reactors. Examples include cobalt-60, cesium-137 and iridium-192. Tailings or waste produced by processing uranium or thorium from ore.
Can someone pleaseeee help if you’re correct I’ll give u brainlist
Answers
Answer:
I think it the second one adding external weight or the third one
Explanation:
I could never. im more like the last one
I'm really sorry if this was no help
CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + CO2 (g) + H20 (1)
In the chemical reaction above, what states are CaCO3 and
H2O in, respectively?
a) Aqueous, Solid
b) Gas, Liquid
c) Gas, Aqueous
d) Solid, Liquid
e) Solid, Aqueous
Answers
Answer:
solid and liquid state respectively
Answer:
A - solid, liquid
Explanation:
ur welcome
name some animals and plants that live on land?
please mark as brainliest
Answers
Answer:
cats, ants, spiders, elephants, porcupine, tiger, kangaroo, and ostrich. Mosses, hornworts, liverworts, lycophyte, seed plants, pteridophytes, and archaeopteridales.
Explanation:
Can you pls help me. TY!
Answers
How are plants and animals the
they different?
same? How are
Answers
Answer:
Plants and animals have different cell types, one is a autotroph and one is a heterotroph, plants can use photosynthesis and animals cannot.
Explanation:
animals are the same and different.
Answer : Plants and Animals are the same because they are both living things, which means they are both made out of cells and also both have DNA and both require energy to grow. Plants and Animals are different because animals usually move around to find their food. While plants are usually immobile and create their food via photosynthesis also animals cells absorb nutrients from food, while plant cells use plastids to create energy from sunlight. Hope I Helped UvU -• •-
3S8 + 8 OH- + 8 S3 + 4 HOOH
In an experiment, a student studies the kinetics of the reaction represented above and
obtains the data shown in the following table.
Initial [S
Initial
Initial (OH)
Experiment
Reaction Rate
(M)
(M)
(M/s)
Trial 1
0.100
0.0100
0.699
Trial 2
0.300
0.0100
2.10
Trial 3
0.300
?
4.19
Use the data in the table and determine the order of the reaction with respect to Sg.
O first order
O zero order
O second order
O third order
Answers
Answer:
Second order
Explanation:
We could obtain the order of reaction by looking at the table very closely.
Now notice that in experiment 1 and 2, the concentration of [OH^-] was held constant while the concentration of [S8] was varied. So we have;
a situation in which the rate of reaction was tripled;
0.3/0.1 = 2.10/0.699
3^1 = 3^1
Therefore the order of reaction with respect to [S8] is 1.
For [OH^-], we have to look at experiment 2 and 3 where the concentration of [S8] was held constant;
x/0.01 = 4.19/2.10
x/0.01 = 2
x = 2 * 0.01
x = 0.02
So we have;
0.02/0.01 = 2^1
2^1 = 2^1
The order of reaction with respect to [OH^-] = 1
So we have the overall rate law as;
Rate = k[S8]^1 [OH^-] ^1
Overall order of reaction = 1 + 1 = 2
Therefore the reaction is second order.
Calculate the number of formula units in 1.87 mol of NH4Cl
a
1.13 x 1024 NH4Cl
b
1.88 x 1023 NH4Cl
c
6.75 x 1024 NH4Cl
d
1.12 x 1024 NH4Cl
Answers
Answer:
c is your answer
Explanation:
So, 53.49 g (M) of NH4Cl N H 4 C l contains 14.01 g (m) of N . So, the mass percent of nitrogen in NH4Cl N H 4 C l is 26.19%.
During photosynthesis, plants take in carbon dioxide, water, and energy from the sun and produce carbohydrates and oxygen. Which of the following statements best explains how plants follow the law of conservation of mass during photosynthesis?
The amount of each element in the reactants equals the amount of each element in the products.
The number of carbon dioxide molecules taken in exactly equals the number of carbohydrate molecules produced.
The plant uses the carbon dioxide gas, liquid water, and energy to produce a solid carbohydrate.
The plants mass does not increase or decrease as a result of photosynthesis.
Answers
Answer:
The amount of each element in the reactants equals the amount of each element in the products.
For the well balanced equation of photosynthesis
4 What is the maximum number of students among whom 125 oranges, 150 citrus
and 225 guavaes can be equally divided? What is share of each fruit for a student?
Find it.
Answers
Answer:
25
Explanation:
fing the highest common factor
pime factorisation:
125=5×5×5
150=2×3×5×5
225=3×3×5×5
find the common numbers in all prime numbers
》5×5=25
The reaction below will occur in a gaseous system at STP:
6 NO (g) + 4 NH3 (g) —> 5 N2 (g) + 6 H20 (g)
What volume of nitrogen gas will be produced from 15.0 L of nitrogen monoxide gas?
12.5 L
18.0L
15.0 L
22.5 L
Answers
Answer:
V = 12.5 L
Explanation:
Given data:
Volume of NO = 15.0 L
Temperature and pressure = standard
Volume of nitrogen gas produced = ?
Solution:
Chemical equation:
6NO + 4NH₃ → 5N₂ + 6 H₂O
Number of moles of NO:
PV = nRT
n = PV/RT
n = 1 atm × 15.0 L / 0.0821 atm.L /mol.K × 273.15 K
n = 15.0 atm.L / 22.43 atm.L /mol
n = 0.67 mol
now we will compare the moles of No and nitrogen gas.
NO : N₂
6 : 5
0.67 : 5/6×0.67 = 0.56
Volume of nitrogen gas:
PV = nRT
1 atm × V = 0.56 mol × 0.0821 atm.L /mol.K × 273.15 K
V = 12.5 atm.L / 1 atm
V = 12.5 L
When polymers are built, the process is called a dehydration reaction. Why is the word “dehydration” used?
Answers
Answer:
i really dont know
Explanation:
35.0 grams of nitrogen gas reacts with 60.0 grams of hydrogen gas: N2 + 3H2--> 2NH3
a) Identify the limiting reagent:
b) Calculate the grams of ammonia formed:
c) Calculate the grams of excess reactant formed:
Answers
Explanation:
Moles of N2 = 35.0g / (28g/mol) = 1.25mol
Moles of H2 = 60.0g / (2g/mol) = 30.0mol
Since 1.25mol * 3 < 30.0mol, nitrogen is limiting.
Moles of NH3 = 1.25mol * 2 = 2.50mol.
Mass of NH3 = 2.50mol * (17g/mol) = 42.5g.
30.0mol - 1.25mol * 3 = 26.25mol.
Excess mass of H2
= 26.25mol * (2g/mol) = 52.5g.
Please help!!! Need answer fast.
Determine the mass of 7.06 × 10^23 atoms Cl.
Answer in units of g.
Answers
^ tap to see the full pic
Explanation:
you make use of the formulas
amount(mol) = number of particles ÷ 6.02 × 10^23
and
mass(g) = amount(mol) × molar mass