Answer:
Explanation:
a. NaCl+ AgNO3-----> NaNO3+ AgCl
b. Số mol của NaCl= 0,2*0,5= 0,1 (mol)
------> Số mol của kết tủa AgCl tạo thành= 0,1 mol (dựa vào phương trình hóa học)
-----> Khối lượng của kết tủa AgCl tạo thành= 0,1*143,5=14,35(g)
c. Số mol của AgNO3= số mol của NaCl= 0,1 (mol)
------> Nồng độ mol của dd AgNO3 đã tham gia phản ứng= [tex]\frac{0,1}{0,4}[/tex]=0,25(M)
If you increase the force on an object, its acceleration increases. True or false
Answer:
true
Explanation:
from Newton's second law of motion ,we can understand that acceleration of a body is directly proportional to the force applied on it and inversely proportional to its mass ,so as the force applied increase,the acceleration also increases
Which process causes the greatest increase in the distance between particles?
Answer: The condensation is the process which causes distance.
What was the ratio in the formula for Iron (II)
oxide?
lete
What was the ratio in the formula for Iron (III)
oxide?
DONE
Answer:
In Iron (II) oxide, ratio is 1:1
In iron (III) oxide, ratio is 4:2
[tex].[/tex]
In Iron (II) oxide, ratio is 1:1
What is the importance of iron oxide?Iron oxides are very important components in most soils as they have major influence on chemical, physical, and microbial properties of soils. Because of their nanoparticulate size (usually 5-200 nm), iron oxides possess large specific surface area.
Generally, iron oxides are prevalent, widely used as they are inexpensive, and play an imperative role in many biological and geological processes. They are also extensively used by humans, eg, as iron ores in thermite, catalysts, durable pigments.
When iron is exposed to moisture or oxygen, oxidation occurs. During this chemical reaction, iron is converted into iron oxide. The iron oxide typically has a reddish, flaky appearance that becomes progressively worse over time.
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What is the formula for Water?
Name full name element's name
Answer:
2 Hydrogen atoms and 1 Oxygen atoms makes water
Explanation:
Hope this helps^^
Answer: Its chemical formula H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms,
Explanation: i hopes it helps :)
which is the largest atom in group IV?
Answer:
A
Explanation:
god loves you
how do you determine the thermal energy of an object
Answer:
An object's thermal energy is dependent upon its temperature and mass. The higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy
difference between molicularity and order of reaction
Answer:
Molecularity is the number of ions or molecules that take part in the rate determining step
Order of reaction is the number of molecules of reactant whose concentration changes during the chemical change
a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. what could this precipitate be?
The compound formed is the quaternary ammonium salt N,N,N-trimethyl-1-phenylmethanaminium iodide.
Quaternary ammonium salts are formed when methyl iodide reacts with an amine. The quaternary ammonium salt is an ionic substance which often has a high melting point. Remember that the melting point of a substance can be used to identify the substance.
In this case, a student reacted 40 drops of an unknown amine with 20 drops of iodomethane in 2 ml of a suitable solvent mixture. after 15 minutes of reaction, a white precipitate formed. the precipitate was isolated and its melting point was recorded to be 178 °c. This precipitate must be N,N,N-trimethyl-1-phenylmethanaminium iodide (Benzyltrimethylammonium iodide) because it is a quaternary ammonium salt whose melting point is 178 °c.
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Bohr models do not correctly show the location of electrons in an atom explain why they are still useful to predict bonding of atoms
Answer:
looo
rdyxvxkxkvxkgxkgdkvx
Explanation:
lolollkvvbffffkhdhlxkgzfjzufsfjsdhayzyrzruzruzufzktzkgdjfdufskdgjgzjfgkzjgskf
how many electrons can occupy the 4p sublevel of a neutral atom of bromine
Answer:
6
Explanation
every p sublevel holds up to 6 electrons
so the 4p sublevel must hold up to 6 electonsr
During chemical reactions__________are broken and___________to form
new substances with different properties, but mass is still_____________ .
Answer:
1st blank : Atoms
2nd blank : Reactants
I'm still trying to find the 3rd blank. I'll put it in comments if I find it
Explanation:
Hope this helps :)
Pls make brainliest :}
And have an amazing day <3
Someone pls help me I will make you you brain
Answer:
i have no clue
Explanation:
umm cause i have no clue sorry lol but good luck
Select the answer that completes each statement.
The
founded the Virginia colony.
The
government took over the Virginia colony because too many colonists had died.
and
worked on the tobacco plantations.
The
was the first elective governing body in a British colony.
Answer:
1 colonists
2 England
3 slaves
4 the House of Burgesses
Answer:
:)
Explanation:
Which of the following elements has only one electron in its outermost s orbital?
A. F
B. Al
C.Mg
D.Na
Answer:
D: Na
Explanation:
Hope this helps!
Have a nice day!!
:D
Assume that wave B has a wavelength of 415 nm. Calculate the frequency of the wave. The value for c is 3.00 x 10 8 m/s. The wavelength of wave A is [__________]Hz.
The wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
What is frequency?Frequency is defined as the number of waves passing through a fixed point in a given amount of time.
The frequency can also be defined as a repeated event is the number of occurrences per unit of time.
Frequency can be expressed as
f = c / ∧
Where c = 3.00 x 10⁸ m/s
∧ = 415 nm
So, f = 3.00 x 10⁸ m/s x 415 nm
f = 7.22 x 10¹¹ Hz.
Thus, the wave B has wavelength of 415 nm. The value for c is 3.00 x 10 8 m/s. The frequency is 7.22 x 10¹¹ Hz.
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what is the potential energy of a 3 kg box lifted to 12.5 meters high?
Answer:
367.5 JExplanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 3 × 9.8 × 12.5 = 367.5
We have the final answer as
367.5 JHope this helps you
Give an example of one pro and one con for the use of stem cells in medicine.
Answer:
pro ca help defeat diseases, con the stem cell might cause harm
Explanation:
The stem cells are used in regenerative medicine to reproduce the body organs and replace the damaged orangs. The disadvantage of stem cells is that it is difficult to culture the stem cells, and they can be transformed into cancerous cells.
What are stem cells?Embryonic stem cells can be described as pluripotent stem cells derived from the inner cell mass of a blastocyst. Human embryos can reach the blastocyst stage 4 to 5 days post fertilization, at which time they contain 50 to 150 cells.
Isolating the inner cell mass using immunosurgery results in the destruction of the blastocyst, a process that raises ethical issues, at the pre-implantation stage have the same moral considerations as embryos in the post-implantation stage of development.
Potential uses of stem cells include the treatment of diabetes and heart disease. The cells are being analyzed or studied to be used in clinical therapies, genetic disorders, and cellular/DNA repair. However, adverse effects in the research processes and clinical processes such as tumors and unwanted responses have been reported.
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Someone pls help me I will make you brain
Answer:
its c I truly believe that it is c
Explanation:
Someone pls help me I will make you brain
Answer:
human migration
Explanation:
Answer:
I think its D
Explanation:
a gas is at 35.0°c and 3.50 l. what is the temperature at 7.00 l?
Answer:
363C
Explanation:
V = KT and T = V/K
3.5=k(35+273) = 308k
k=3.5/308 =0.011
new T=7.0/0.011=636K = 636-273 =363C
Please help, I'll give brainiest
Coffee is a solution containing caffeine, acids, alkaloids, water, phenols, and many other chemicals. The solvent in the coffee solution is (1) __________ and the rest of the chemicals dissolved in the solvent are called (2)_________.
3. What is the difference between a saturated solution and a supersaturated solution?
4. Is the following molecule, polar or nonpolar?
5. 12 eggs can be referred to as one dozen eggs.
______________ particles can be referred to as one mole of particles.
6.
The pH of a strong acid might be _____ while the pH of a strong base might be _____
The pH of pure water is _____.
7. What would be the pH of .002 moles of HNO3 dissolved in 2 L of water?
8. A base has a pH of 8.5. What is the concentration of OH- ions in the solution?
Solutes dissolve in solvents to form a solution. A saturated solution contains just as must solute as it can normally hold.
The solvent in the coffee solution is water and the rest of the chemicals dissolved in the solvent are called solutes. A solution is formed when a solute is dissolved in a solvent.
A saturated solution contains just as much solute as it can normally hold at a particular temperature while a supersaturated solution contains more solute than it can normally hold at a particular temperature.
A polar molecule contains covalent bonds between atoms having an electronegativity difference above 0.5. Such molecules are polar as electrons of the bond are drawn closer to the atom that is more electronegative.
According to Avogadro's law; 6.02 × 10^23 particles is referred to as one mole of particles.
A strong acid has a pH that may range from 0 - 3. A strong base has a pH of around 10 - 14. Water is a neutral substance and has a pH of 7.
From the information provided;
Number of moles of acid = 0.002 moles
Volume of solution= 2 L
Concentration of solution = number of moles/volume = 0.002 moles/2L = 0.001 M
pH = - log[H^+]
pH = - log[0.001 ]
pH = 3
From;
pH + pOH = 14
pOH = 14 - pH
pOH = 14 - 8.5
pOH = 5.5
pOH = - log[OH^-]
[OH^-] = Antilog[-5.5]
[OH^-] = 3.2 × 10^-6 M
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Help meeeeeeeeeeeeeee
Answer:
whatttttttttttttttttttttttt
Answer:
Breaking glass - chemical change
popsicle - physical
milk - chemical
bread - physical
roasting - chemical
egg - chemical
fireworks - chemical
mixing something with water - chemical
popcorn - chemical
colouring hair - physical
melting chocolate - physical
crumpled paper - physical
rusted nails - chemical
crushed can - physical
cooked egg - chemical
bending metal - physical
melting ice - physical
bleaching clothes - chemical
If u want to differentiate between chemcial and physical change u need to remember this-
physical change - no new substance is formed (Even for melting of ice it's still water) and it can be reversible, except for some cases like tearing of paper
chemical change - a new substance is formed
Which two conversion factors would be used to convert the quantity of 4500 seconds into hours.
Answer:
the answer is A
Explanation:
in 60 seconds there is 1 minute and in 60 minutes there is one hour
what is the empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms?
The empirical formula of a compound that consists of 0.039 moles of iron atoms combined with 0.052 moles of oxygen atoms is FeO[tex]\rmFeO_{2}[/tex].
What is empirical formula?The simplest whole number ratio of atoms in a compound is the empirical formula of a chemical compound in chemistry. Sulfur monoxide's empirical formula, SO, and disulfur dioxide's empirical formula are two straightforward examples of this idea.
The simplest whole number ratio of each type of atom in a compound is its empirical formula. It can be determined from data on the mass of each component in a compound or from the composition's proportion.
calculation:
Fe = 56/0.039 = 150
O = 16/0.052 = 300
in simplest term ratio is 1:2
Thus, empirical formula is FeO[tex]\rmFeO_{2}[/tex].
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1- Calcium Hydroxide + Calcium Bicarbonate
2- Calcium Bicarbonate + Sodium Carbonate
3- Calcium Sulphate + Sodium Carbonate
4- Sodium compound + Calcium Sulphate
5- Carbon dioxide + Calcium Carbonate
6- Calcium Bicarbonate + Calcium Carbonate
Remember these followings :-
Acid + Base = salt + water
Acid + metal = salt + hydrogen
Acid + carbonates = salt + water + carbon dioxide
Base + ammonium salt = salt + ammonia + water
Base + acidic oxide = salt + water
I hope that you will be clear via these formulas.
A container contains three gases. If the partial pressure of carbon dioxide is 0.50 atm, the partial pressure of nitrogen is 0.30 atm, and the partial pressure of methane is 0.40 atm, what’s the total pressure inside the container?
Answer:
1.20 atm
Explanation:
A container contains three gases. If the partial pressure of carbon dioxide is 0.50 atm, the partial pressure of nitrogen is 0.30 atm, and the partial pressure of methane is 0.40 atm, what’s the total pressure inside the container?
Do not let chemistry questions SCARE you! The TOTAL means
ADD THEM UP.
You can do this without a scientific calculator :-)
0.50 +0.30 + 0.40 = 1.20 atm
what is the pattern of liquids and solids from the center of the earth out
Explanation:
I'm sorry if this doesn't answer this correctly but solid liquid solider solid liquid/solid
Regular table salt is sodium chloride, NaCl. It is a bonding of an Na+ ion and a Cl- ion. Which of these ions is bigger?
Answer:
in the periodic table we can see that the ions of Cl is greater than the ions in Na
Cl- ion is bigger than Na+ ion because of the presence of more number of electrons.
The atomic number of sodium+ ion is 10 means it has 10 number of electrons which can accommodate into 2 shells or orbits while on the hand, chlorine- ion has atomic number 18 means it has 18 number of electrons which can be accommodate into 3 shells or orbit.
So there is one shell more in chlorine ion as compared to sodium ion which make the size of chlorine ion large so we can conclude that chlorine ion is bigger than sodium ion.
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Can a non-metal replace a metal in a single replacement reaction? If yes, is a non-metal always not able to replace a metal in a single replacement reaction?
Non-metals will never replace metals or vice versa, they'll only replace itself or the only type of reaction that it is or element that it is.
Which material is a heterogeneous mixture?
O A. A brass coin
B. Tap water
C. Vinegar
D. Soil
Answer:
D
Explanation:
Heterogeneous mixture is a mixture of non-uniform composition & in which the components can be easily identified
Answer:
Soil
Explanation:
Soil is made up of many things (therefore it's not pure) and does not appear to be uniform; it does not look the same throughout. Therefore it is heterogeneous.
