Answer:
Thomson's experiments with cathode ray tubes showed that all atoms contain tiny negatively charged subatomic particles or electrons. Thomson's plum pudding model of the atom had negatively-charged electrons embedded within a positively-charged "soup."
Explanation:
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Back page anwsers of adobe sisters recap sheet
Answer:
I'm sorry, you didn't post the pictures.
Discuss what your community do to deal with poverty
How is the mass number of an atom calculated?
Answer: Protons plus neutrons
Explanation: Atomic mass of an element is the sum of protons and neitrons. They are 1 amu (atomic mass unit) each. Electrons are negligible mass and are left out of the calculation.
The mass number of an atom is calculated by adding proton plus neutrons , therefore option (b) is correct.
What do you mean by the mass number of the atom?
An atom’s mass number, also called atomic mass number is the total number of protons and neutrons present in an atomic nucleus.
Protons and neutrons are collectively known as nucleons.
An electron is almost negligible in weight. Thus, the atomic mass of an atom is almost the same as its mass number.
The total number of protons and neutrons present in one atom of an element is known as its mass number.
Mass number = Number of protons + Number of neutrons
The mass number of an atom is calculated by adding proton plus neutrons , hence option (b) is correct.
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7. In an atom, electrons revolve around the nucleus in their shell. The K shell can only accommodate 2 electrons while L shell can accommodate 8 electrons. Give
Now lets she s-subshell structure .
Take an element Berylium
[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}}[/tex]
You can see the S-orbital has only space for 2electrons .
So K shell has 2electronsCome to p-orbital
Take an element Neon
[tex]\huge{\overset{1s^2}{\boxed{\uparrow\downarrow}}\overset{2s^2}{\boxed{\uparrow\downarrow}}\overset{2p^6}{\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow}\boxed{\uparrow\downarrow} }}[/tex]
The 2 means its L shell .
It has 8 electrons only and full filled .
Hence L shell can have only 8electrons
The number of protons in one atom of an element determines the atom's ____________
and the number of electrons determines ___________
of an element.
Answer:
the number of protons in one atom of an element determines the atom's identity, and the number of electrons determines its electrical charge
Explanation:
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How much silver chloride is precipitated when 25.0 g of calcium chloride and 25.0 g of silver nitrate are mixed together in a beaker of water?
CaCl2 + 2AgNO3 --> Ca(NO3)2 + 2AgCl
Answer:
21.09 g of AgCl
Explanation:
Hopefully the picture is clear and the method is understandable.
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4. Write the electronic configuration of first 20 elements in the periodic table.
Hydrogen: 1
Helium: 2
Lithium: 2•1
Beryllium:2•2
Boron: 2•3
Carbon: 2•4
Nitrogen:2•5
Oxygen:2•6
Fluorine: 2•7
Neon:2•8
Sodium: 2•8•1
Magnesium: 2•8•2
Aluminium: 2•8•3
Silicon: 2•8•4
Phosphorus: 2•8•5
Sulfur: 2•8•6
Chlorine: 2•8•7
Argon: 2•8•8
Potassium: 2•8•8•1
Calcium: 2•8•8•2
Please give me brainliest, I spent a lot of time doing this
What is the formula for calculation of acceleration?
Answer:
see picture for answer
Explanation:
please mark me brainliest pleaseWhat volume of silver will
have a mass of 2500 g if the
density of silver is 10.5 g/cm3?
ANSWER
= 238.09cm³
IF THE ANSWER IS RIGHT PLEASE MARK AS BRAINLIEST
2. Choose the best answers
1. A spon used to open the lid of a can is...
(1) first class lever
(ii) second class lever
(ii) thin class lever
(i) none of them.
2. Which simple machine is used to right the screw with screw driver?
(1) Lever (ii) Wheel and Axle (ii) inclined plane (iv) Wedge
3.Which category of the simple machine is autotly Kito
(i) Lever (ii) Wheel and Axle (iii) Pulley (iv Wedged.
4. Which type of the simple machine is the axe!
(1) Lever (2) Screw (3) Wedge (4) Inclined plane
5. Which type of the simple machine is winding road in hilly
(i) Lever (ii) Wedge (iii) Serew (iv) Inclined plane
Answer:
4 ans is 3,5ans is iv i know only this much
Which is an example of a polymer?
Answer:
A: Cellulose
Explanation:
Cellulose in paper and tree
Given 10 gram samples of LiCl, LiBr, LiF, LiI, place the samples in order of least to greatest number of atoms of lithium, Li.
The given sample of 10 grams shows the mass of the following compounds.
(LiCl, LiBr, LiF, LiI).
To arrange them in hierarchical order from the least to the greatest, we need to determine their respective number of moles because it is directly proportional to their atomicity.
By using the formula:
[tex]\mathbf{Number \ of \ moles = \dfrac{mass}{ molar \ mass}}[/tex]
For LiCl, its molar mass = (42.39) g/mol
[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{42.39 \ g/mol}}[/tex]
number of mole for LiCl = 0.2359 moles
For LiBr, its molar mass = (86.85) g/mol
[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{86.85 \ g/mol}}[/tex]
number of mole for LiBr = 0.1151 moles
For LiF, its molar mass = (25.94) g/mol
[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{25.94 \ g/mol}}[/tex]
number of mole for LiF = 0.3855 moles
For LiI, its molar mass = (133.85) g/mol
[tex]\mathbf{Number \ of \ moles = \dfrac{10 \ g}{133.85 \ g/mol}}[/tex]
number of mole for LiI = 0.0747 moles
Therefore, we can conclude that the samples in hierarchical order from the least to the greatest is as follows:
LiI < LiBr < LiCl < LiF
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2.56g of impure copper(ii) sulphate sample was dissolved in water and precipitated with excess copper hydroxide solution. if 1.245g of copper (ii)hydroxide was obtained, what is percentage of copper(ii) sulphate in the impure sample
Since we know that 1.245g of Cu(OH)2 was obtained after the solid precipitated in water, it means that the remaining has to be CuSO4. Thus, we can take the difference between the two masses to get the mass for CuSO4.
After that, divide the mass of CuSO4 by the overall mass of the impure substance, multiply it by 100, and you will get the percentage of purity.
4. Write down the differentiate between a. Atom and molecules
Answer:
Atoms are single neutral particles. Molecules are neutral particles made of two or more atoms bonded together.
Explanation:
Atom refers to the smallest constituent unit of a chemical element. Molecules refer to a group of two or more atoms that are held together due to chemical bonds.
Answer: Atoms are single neutral particles while molecules are neutral particles made of two or more atoms bonded together
Explain why changes of state are physical changes.
Solution: Change in state of matter is a physical change because of the physical condition and appearance changes but not the chemical composition.
Use the word stable to explain why the alkali metals tend to lose 1 valence electron.
Answer:
becoz vvv is always with you
Answer:
Alkali metals have one valence electron on their outer shell. They are more stable when they have eight valence electrons so they tend to loose that one electron and obtain a full octet, therefore become stable
Which of the following is an example of a pure substance? *
1 point
Iron shavings
Trail mix
Sodium Chloride mixed with sand
Solution of hydrochloric acid and water
Answer:
Iron shavings
Explanation:
A substance that has a fixed chemical composition throughout and a mixture is when two or more substances are combined, but they are not combined chemically.
can you pls tell me advantages and disadvantages of chemistry in specific
Advantages
Chemistry helps you to understand the world around you.
Basic knowledge of chemistry helps you to read and understand product labels.
Chemistry can help you make informed decisions.
Chemistry is at the heart of cooking.
A command of chemistry can help keep you safe!
Disadvantages
It isn't a sustainable form of energy.
It can be expensive.
Some forms of chemical energy are quite rare.
It can produce harmful waste.
It can be used to create devastating weapons.
It offers short-term benefits for long-term consequences.
which one has minimum number of atom?
(a) 8g O2 gas
( b) 1g H gas
(c)7 g nitrogen gas
(d) 1.5 g helium gas
Answer: 1 g H2 gas
Explanation:
8g O2 = 0.25 moles
1g H2 = 0.50 moles [I assume you mean H2, not H. If it is H, then moles = 1.0 moles H
7g N2 = 0.25 moles
1.5 g He = 0.43 moles
===============
The moles above are based on molecules. All but He are multiplied by 2 to give the number of atoms. If H2 is correct, it has the greatest number of atoms. (Not if it is just H).
Can someone help me out on this ♡
Explanation:
Actually, the diagram showned in the picture gave you some hints.
Moving every one block to the left indicates 10 times the value of the symbol than the previous one.
For instance,
[tex]1\text{ km}=10^1\text{ hm}=10^2\text{ dam}=10^3\text{ m}[/tex]
Take the first question as example, since "k" is 9 blocks from the left of mu (u),
[tex]1 \text{ kg}=10^9 \text{ }\mu\text{g}[/tex]
[tex]\text{So }.000078\text{ kg}=.000078\times10^9 \text{ }\mu\text{g}=7.8\times10^{-5}\times10^9 \text{ }\mu\text{g}=7.8\times 10^4\text{ }\mu\text{g}[/tex]
Similarly,
[tex]1 \text{ cL}=10^{-2} \text{ L}[/tex]
[tex]\text{So }34800\text{ cL}=34800\times10^{-2} \text{ L}=3.4800\times10^{4}\times10^{-2} \text{ L}=3.48\times 10^2\text{ L}[/tex]
[tex]1 \text{ Mm}=10^{3} \text{ km}[/tex]
[tex]\text{So }.0283\text{ Mm}=.0283\times10^{3} \text{ km}=2.83\times10^{-2}\times10^{3} \text{ km}=2.83\times 10^1\text{ km}[/tex]
Match the behavior of light on different types of matter. The task is to match the lettered items with the correct numbered items. Appearing below is a list of lettered items. Following that is a list of numbered items. Each numbered item is followed by a drop-down. Select the letter in the drop down that best matches the numbered item with the lettered alternatives. a. Allows light to pass through and scatters it as it passes through. b. Does not let light pass through. c. Allows light to pass right through without being scattered. 1. Solid c 2. Liquid a 3. Gas
Answer:
A beam of light (implicitly a plane wave) in vacuum or in an isotropic medium propagates in the particular fixed direction specified by its Poynting vector until it encounters the interface with a different medium. The light causes the charges (electrons, atoms, or molecules) in the medium to oscillate and thus emit additional light waves that can travel in any direction (over the sphere of 4π steradians of solid angle). The oscillating particles vibrate at the frequency of the incident light and re-emit energy as light of that frequency (this is the mechanism of light “scattering”). If the emitited light is “out of phase” with the incident light (phase difference ∼= ±π radians), then the two waves interfere destructively and the original beam is attenuated. If the attenuation is nearly complete, the incident light is said to be “absorbed.” Scattered light may interfere constructively with the incident light in certain directions, forming beams that have been reflected and/or transmitted. The constructive interference of the transmitted beam occurs at the angle that satisfies Snell’s law; while that after reflection occurs for θreflected = θincident. The mathematics are based on Maxwell’s equations for the three waves and the continuity conditions that must be satisfied at the boundary. The equations for these three electromagnetic waves are not difficult to derive, though the process is somewhat tedious. The equations determine the properties of light on either side of the interface and lead to the phenomena of:
1. Equal angles of incidence and reflection;
2. Snell’s Law that relates the incident and refracted wave;
3. Relative intensities of the three waves;
4. Relative phases of the three light waves; and
5. States of polarization of the three waves.
Explanation:
How many kilograms are in one teragram?
Answer:
0.0001 Tg 100000 kg
0.001 Tg 1000000 kg
0.01 Tg 10000000 kg
0.02 Tg 20000000 kg
Explanation:
Match the event with the type of change.
a. Making ice cubes from water
b. Making hot water for tea
c. Using dry ice to create a foggy punch bowl
а
<
1. Changes Between Liquids and Solids
2. Changes Between Liquids and Gases
3. Changes Between Solids and Gases
a
<
av
Answer:
A-1,
B-2,
C-3 is the answer of this queation
How does a wildfire start?
Answer:
Sometimes, fires occur naturally, ignited by heat from the sun or a lightning strike. However, most wildfires are because of human carelessness such as arson, campfires, discarding lit cigarettes, not burning debris properly, playing with matches or fireworks.
HELP PLEASE !!!!!!!!!
Answer:
Explanation:
Let's start b writing down coordinates of all points:
A(0,0,0)
B(0,5,0)
C(3,5,0)
D(3,0,0)
E(3,0,4)
F(0,0,4)
G(0,5,4)
H(3,5,4)
a.) When we reflect over xz plane x and z coordinates stay same, y coordinate changes to same numerical value but opposite sign. Moving front-back is moving over x-axis, moving left-right is moving over y-axis, moving up-down is moving over z-axis.
A(0,0,0)
Reflecting
A(0,0,0)
B(0,5,0)
Reflecting
B(0,-5,0)
C(3,5,0)
Reflecting
C(3,-5,0)
D(3,0,0)
Reflecting
D(3,0,0)
b.)
A(0,0,0)
Moving
A(-2,-3,1)
B(0,-5,0)
Moving
B(-2,-8,1)
C(3,-5,0)
Moving
C(1,-8,1)
D(3,0,0)
Moving
D(1,-3,1)
Someone plz help me :(
What happens to acceleration when mass is increased
Answer:
If you increase the mass at a given force the rate of acceleration slows. Therefore, mass is inversely proportional to acceleration. ... Force is directly proportional to acceleration (force ~ acceleration) As force increases acceleration increases.
acceleration slows down .
Explanation:
if we increase the mass at a given force the rate of acceleration slows
Ductile means...
a. can be drawn into wire.
b. the element is brittle,
c. the element is shiny
Answer:
A
Explanation:
which step in the scientific method has an if/then statement
independent and dependent variables.
1)
Now it's time to state your hypothesis. ...
2) The hypothesis is often written using the words "IF" and "THEN." For example, "If I do not study, then I will fail the test." The "if' and "then" statements reflect your independent and dependent variables.
Which pair of elements has atoms with the same number of valence electrons ?
a. indium (In) and lead (Pb)
b. potassium (K) and bromine (Br)
c. silicon (Si) and germanium (Ge)
d. astatine At) and radon (Rn)
Answer:silicon (Si) and geranium (Ge)
Explanation:
Silicon and germanium have the same valency. So the correct option is C.
What is valency?
Valence is also referred valency, in the field of chemistry is defined as the property of an element which will determine how many other atoms can this atom combine with
This term was introduced in the year 1868. It is mainly used to present the combination ability of an element in general and also the numerical value of that power of combination.
A major challenge for the chemists of the 19th century was the explanation and the systematization of valency.
When there was an absence of a determination of its cause, the efforts started to centre on the development of empirical rules for determining the numerical values of valences.
The number of atoms of hydrogen with which an atom of the atom can combine or can replace a compound is defined as the characteristic valences for the elements.
Therefore the correct option is C.
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