Answer:
The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law). The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).
Explanation:
Answer:
The volume of a given gas sample is directly proportional to its absolute temperature at constant pressure (Charles's law). The volume of a given amount of gas is inversely proportional to its pressure when temperature is held constant (Boyle's law).
Explanation:
write down the importance of solution in our daily life in any 4 points
Explanation:
Four importances :
1. Solution of tea leaves, water and sugar is used to make tea
2. Solutions of the chemicals are used in labrotary
3. The drinks that we take are also a kind of solution
4. The air is also a solution of different gases
What is the formula for calculation of acceleration?
Answer:
see picture for answer
Explanation:
please mark me brainliest pleaseA sample of a compound that contains only the elements C, H, and N is completely burned in O2 to produce 44.0 g of CO2, 45.0 g of H2O, and some NO2 . A possible empirical formula of the compound is
Explanation:
what you have to do is to multiply the given grams with the ratio of grams of that certain element in it's full compound in order to isolate the compound and get the element.
because the question did not specify how many grams of NO2 is formed, we can assume that the mass is neglegible, thus 1 mole was assigned to Nitrogen.
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
Back page anwsers of adobe sisters recap sheet
Answer:
I'm sorry, you didn't post the pictures.
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.
For more information go to
https://socratic.org/questions/5631d10b11ef6b4609a78ee2
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.
Read more about valency, here
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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
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]
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.
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
20
20
A
B
С
9
D
E
19
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
А
B
С
1 0
]
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.
Which is an example of a polymer?
Answer:
A: Cellulose
Explanation:
Cellulose in paper and tree
7) Explain how the atomic number of an element identifies the element.
Answer:
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.
Answer:
Atoms of each element contain a characteristic number of protons. In fact, the number of protons determines what atom we are looking at (e.g., all atoms with six protons are carbon atoms); the number of protons in an atom is called the atomic number.
Explanation:
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).
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.
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 8electronsHow 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:
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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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
Ductile means...
a. can be drawn into wire.
b. the element is brittle,
c. the element is shiny
Answer:
A
Explanation:
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
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.
Discuss what your community do to deal with poverty
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
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
Someone plz help me :(
The collection of which of the following gases involves a catalyst?
A)oxygen
B)ammonia
C)carbon dioxide
Answer:
Ammonia
Explanation:
I believe that ammonia is the correct answer to this question.
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
Learn more about atomic numbers here:
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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.
