Answer:
4.207
Explanation:
PH = -log .000062=4.207
Consider a 0.10 M solution of a weak polyprotic acid (H2A) with the possible values of Ka1 and Ka2 given below. Calculate the contributions to [H3O+] from each ionization step. Ka1=1.0×10−4;Ka2=5.0×10−5
Answer:
The first dissociation occurred at 0.00311 M and the second at 0.0000484 M.
Explanation:
From the given information:
The ICE table can be computed as follows:
H2A → HA⁻ + H⁺
Initial 0.10 0 0
Change -x x x
Equilibrium 0.10 - x x x
[tex]Ka_1 = \dfrac{[HA^-][H^+]}{[H_2A]}[/tex]
[tex]1.0\times 10^{-4}= \dfrac{[x][x]}{[0.10-x]}[/tex]
[tex]1.0\times 10^{-4}= \dfrac{(x)^2}{(0.10-x)}[/tex]
By solving for x;
x² = (1.0 × 10⁻⁴ × 0.1)
x = [tex]\sqrt{1\times 10^{-5}}[/tex]
x = [H⁺] =[HA⁻] = 0.00311 M
The acid then further its dissociation again, So;
The ICE table can be computed as follows:
HA⁻ → A⁻ + H⁺
Initial 0.00311 0 0.00311
Change -x x x
Equilibrium 0.00311 - x x 0.00311 + x
[tex]Ka_2 = \dfrac{[A^-][H^+]}{[HA]}[/tex]
[tex]5.0 \times 10^{-5} = \dfrac{(0.00311+x)x}{(0.00311-x)}[/tex]
By solving for x;
x = [H⁺] = 0.0000484 M
Therefore, the first dissociation occurred at 0.00311 M and the second at 0.0000484 M.
Question 20 (1 point)
The chemical formula for glucose, a simple sugar, is CH1206. The formula for ethanol is CzH60. What
accounts for the differences in these compounds?
Answer:
A. The ratio of the element in glucose is different than in ethanol
Explanation:
The compounds given are;
Glucose C₆H₁₂O₆
Ethanol C₂H₆O
The two compounds given are different from one another. But they have the same elemental composition.
Ethanol is made up of Carbon, hydrogen and Oxygen and so also, Glucose
Now,
The number of atoms in both compounds are different;
Number of atoms
C H O
Glucose 6 12 6
Ethanol 2 6 1
How many protons are in an atom of tin?
Answer:
50
Explanation:
there are 50 protons in an atom of tin
8 grams of hydrogen and 32 grams of oxygen will combine to form how many grams of water?
Answer:
9 grams of water
Explanation:
true or false, a materials melting point and freezing point are the same.
Answer:
I think that is true but I could be wrong
Explanation:
What is the molar mass of B,(Croa)g?
a. 186 g/mol
b. 369 g/mol
C. 232 g/mol
d. 250 g/mol
PLEASE HELP ME I NEED IT TO BRING MY GRADE UP
Answer:
the attached file
Explanation:
The potassium is an alkali metal which explode in water to produce base and hydrogen gas. The balancing came from the fact that each side needed the same number of hydrogens so I made the products have 4 (the lowest even number) then put the appropriate coefficients in the reactants to make that work. Since there are two molecules of potassium hydroxide there also needed to be 2 atoms of potassium in the reactants.
Señalar la opción correcta El primer alcalino y el primer gas noble tienen la misma cantidad de niveles ocupados El primer alcalinotérreo tiene 2 e en su CEE El cuarto halógeno tiene 5 electrones de valencia
Answer:
El primer gas alcalino y el primer gas noble tienen el mismo número de niveles ocupados. Cierto.
La primera tierra alcalina tiene 2 e en su CEE. Cierto.
El cuarto halógeno tiene 5 electrones de valencia. Falso.
Explicación:
El primer alcalino y el primer gas noble tienen el mismo número de niveles ocupados porque el primer alcalino tiene 1 electrón y solo tiene una capa, mientras que el gas noble tiene 2 electrones y también tiene una capa. El primer alcalinotérreo tiene 2 e en su CEE debido a la presencia en el segundo grupo en la tabla periódica. El cuarto halógeno no tiene 5 electrones de valencia en su capa más externa, tiene 7 electrones en su capa más externa debido a la presencia en el grupo de siete de la tabla periódica.
5. Which is incorrect about pure substances and mixture?
A. Colloids and suspensions from two or more phases.
B. Mixtures can be composed of different elements and compound.
C. The components of compound can be separated through distillation.
D. The sample of a compound from different sources have the same composition and proportion of elements.
Answer:
B
Explanation:
mixture is two or more substances chemically combined that retain their physical and chemical properties
how much heat is absorbed when 15.0 g of liquid water is heated until the temperature increases by 16.0.
What is different about the transition metals and
their charges from other groups on the periodic
table?
A: Their charge is positive but not always the same each
time
B: Their charge is negative but not always the same each
time
C: they are usually neutral
Answer:
i think a im not 100 %sure
Explanation:
Most transition metals differ from the metals of Groups 1, 2, and 13 in that they are capable of forming more than one cation with different ionic charges. It can sometimes lose two electrons to form the Fe2+ ion, while at other times it loses three electrons to form the Fe3+ i hope it helped
Calculate the atoms of hydrogen in 52.0 g of H2O.
Answer:
34.81 ×10²³ atoms
Explanation:
Given data:
Mass of water = 52.0 g
Number of atoms of hydrogen = ?
Solution:
Number of moles of water:
Number of moles = mass/molar mass
Number of moles = 52.0 g/ 18 g/mol
Number of moles = 2.89 mol
1 mole of water contain 2 mole of hydrogen.
2.89 mole of water contain 2.89× 2= 5.78 moles of hydrogen.
Number of atoms of hydrogen:
1 mole = 6.022×10²³ atoms
5.78 mol × 6.022×10²³ atoms / 1mol
34.81 ×10²³ atoms
Please Help ASAP 100 points! Students set up a controlled experiment. They put five crickets in each of three identical containers. They set one container to 15C, one to 20C and one to 25C. Then they count the number of cricket chirps in each container during 1 hour. What are the TWO constants in this experiment? A: The number of crickets in each container. B:The temperature of each container. C: The number of cricket chirps. D: The kind of containers used.
Answer:
A and C.
Explanation:
Consider the following reaction: 3Fe(s) + 4H₂O(g) ➞ Fe₃O₄(s) + 4H₂(g). To answer the following question: "How many moles of hot water vapor (steam) must react to produce 275 g of Fe₃O₄?" How many steps will it take to get the answer? *
4 points
1
2
3
4
Carbonate is a polyatomic ion whose oxidation number is -2. How many carbonate ions would be required to bond with aluminum in a neutral ionic compound?
Answer: Three carbonate ions are required to bond with aluminum in a neutral ionic compound.
Explanation:
An ionic compound is defined as the compound that is formed by the complete transfer of electrons takes place from one atom (forming cation) to another atom (forming anion).
A neutral ionic compound does not carry any charge on it.
As we know, aluminum is a trivalent atom having valency 3 and forms [tex]Al^{3+}[/tex] ion and carbonate is a divalent polyatomic ion having formula [tex]CO_3^{2-}[/tex].
They both combine to form a neutral ionic compound named aluminum carbonate.
By criss cross method, the chemical formula of aluminum carbonate is [tex]Al_2(CO_3)_3[/tex]
Hence, three carbonate ions are required to bond with aluminum in a neutral ionic compound.
Which group of elements gain electrons?
Answer:
Non-metals tend to gain electrons
Explanation:
Need help with this can some please help
Liquid or solid water that falls to the ground is called
H to I in the diagram indicates two layers of:
A. phospholipids
B. gated channel proteins
C. pore proteins
D. cholesterol
Form a bond: Each electron has a charge of 1–, and each proton has a charge of 1+. You can calculate the charge of an atom by subtracting the number of electrons from the number of protons. Move an electron from the sodium to the chlorine atom.
1. Sodium has a charge of 1+ and chlorine has a charge of 1-
2. Chlorine has a charge of 1+ and sodium has a charge of 1-
3. Both atoms have a charge of 1+
4. Both atoms have a charge of 1-
Answer:
1. Sodium has a charge of 1+ and chlorine has a charge of 1-
Explanation:
Sodium has 11 protons and 11 electrons. If you remove one electrons we now have only 10 electrons.
Hence; number of protons - number of electrons = 11 - 10 = +1
Sodium has a charge of +1
Chlorine has 17 electrons and 17 protons. if it gains 1 electron then it now has 18 electrons.
Hence; number of protons - number of electrons = 17 - 18 = -1
Chlorine has a charge of -1
In a lever,E×E.D.=L×__________
Answer:
LD is a answer okkkkkkkkkkkkkkkkk
PHYSICAL SCIENCE PLEASE PLEASE HEP DUE TODAY AT 11!! will give brainly if its correct!! <3333 thank you so muchh!!
Which problem cannot be solved using the scientific method?
determining which student reads faster
discovering who invented the radio
discovering how much salt should be used to boil water faster
determining which laundry detergent works best
Answer:
I would say discovering who invented the radio.
Explanation:
The other ones can be solved by experiments and the "discovering who invented the radio" cannot be solved by an experiment.
hope this helps.
Answer:
I would say who invented the ratio
Explanation:
Well you dont need to use the scientific method to know WHO discovered it, you use it to determine HOW
Below is the balanced equation for the production of methane. Use it to explain how the law of conservation of matter is upheld in the decomposition of organic trash. 4C2H5O2N + 2H2O → 3CH4 + 5CO2 + 4NH3 Glycine + Water yields Methane + Carbon dioxide + Ammonia
Answer:
See explanation
Explanation:
A balanced equation demonstrates the conservation of mass because the same number of of atoms of each element is found on both sides of the reaction equation.
This goes a long way to establish that mass or matter can neither be created nor destroyed but may be transformed from one form to another.
Looking at this balanced reaction equation;
4C2H5O2N + 2H2O → 3CH4 + 5CO2 + 4NH3
There are eight carbon atoms on both sides of the reaction equation
There are 24 hydrogen atoms on both sides of the reaction equation
There are 10 oxygen atoms on both sides of the reaction equation
There are four nitrogen atoms on both sides of the reaction equation
Hence, the law of conservation of matter is upheld in the decomposition of organic trash.
The balanced equation for the production of methane:
[tex]4C_2H_5O_2N + 2H_2O ----> 3CH_4 + 5CO_2 + 4NH_3[/tex]
Balanced chemical equation:A balanced chemical equation occurs when the number of the atoms involved in the reactants side is equal to the number of atoms in the products side. According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.
From given balanced equation for the production of methane:
[tex]4C_2H_5O_2N + 2H_2O ----> 3CH_4 + 5CO_2 + 4NH_3[/tex]
There are 8 carbon atoms, 24 hydrogen atoms, 10 oxygen atoms and 4 nitrogen atoms on both sides of the reaction equation, i.e. equal number of atoms on both reactants and products side.
Hence, the law of conservation of matter is upheld in the decomposition of organic trash.
Find more information about Balanced chemical reaction here:
brainly.com/question/15355912
What are two reasons that someone would want to become a scientist?
1 point
Your answer
What is a buffer made from?
A buffer is made from an acid - base conjugate pair as shown by option A
What is a buffer?Buffers are often composed of weak acids and their conjugate bases (or weak bases and their conjugate acids). The weak acid can contribute a proton to balance any new base, whereas the conjugate base can absorb a proton to do so.
This balance between the acid and its conjugate base allows the buffer to survive pH changes. Buffers are essential in biological systems because many biochemical processes are particularly sensitive to pH changes.
Learn more about buffer:https://brainly.com/question/31847096
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using the model, what is the mass of the atom pictured?
A) 3amu
B) 5amu
C) 7amu
D) 9amu
Answer:
A) 3amu
Explanation:
Some consumers, like lions, do not eat plants or any other producers. They only eat other animals.
How do lions obtain the carbon they need?
by eating animals that have carbon-based molecules stored in their bodies
by breathing it in from the atmosphere in the form of carbon dioxide
by absorbing carbon-based molecules through their skin from the soil
by drinking water that contains carbon dioxide
Answer:
a
Explanation:
Some consumers, like lions, do not eat plants or any other producers. They only eat other animals. lions obtain the carbon they need by eating animals that have carbon-based molecules stored in their bodies and the correct option is option 1.
What are Consumers?Heterotrophs are known as consumers because they consume producers or other consumers. Heterotrophs occupy the second and third levels in a food chain, a sequence of organisms that provide energy and nutrients for other organisms.
Heterotrophic living organisms include all animals and fungi, some protists and bacteria, many types of parasitic plants.
Carnivores (organisms that eat meat) and omnivores (organisms that eat plants and meat) occupy the third level.
Therefore, Some consumers, like lions, do not eat plants or any other producers. They only eat other animals. lions obtain the carbon they need by eating animals that have carbon-based molecules stored in their bodies and the correct option is option 1.
Learn more about Consumers, here:
https://brainly.com/question/15869639
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4C + Sg → 4CS
is this balanced or unbalanced?
answer correctly please for a brainlesit! I WILL AWARD U ASAP PLEASEEE
Answer:
Full moon
Explanation:
Went from cresent to half, meaning it should go to full moon next~
Will sodium displace iron from iron oxide?
Answer:
Explanation: A more reactive metal will displace a less reactive metal from a compound. The thermite reaction is a good example of this. It is used to produce white hot molten (liquid) iron in remote locations for welding. A lot of heat is needed to start the reaction, but then it releases an incredible amount of heat, enough to melt the iron.
aluminium + iron(III) oxide → iron + aluminium oxide
2Al + Fe2O3 → 2Fe + Al2O3
Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. The aluminium removes oxygen from the iron(III) oxide:
Answer:
Displacement reactions involve a metal and a compound of a different metal. In a displacement reaction:
Explanation:
a more reactive metal will displace a less reactive metal from its compounds
Displacement reactions are easily seen when a salt of the less reactive metal is in the solution. During the reaction:
the more reactive metal gradually disappears as it forms a solution
the less reactive metal coats the surface of the more reactive metal
For example, magnesium is more reactive than copper. When a piece of magnesium is dipped into blue copper sulfate solution:
the blue colour fades as colourless magnesium sulfate solution forms
brown copper coats the surface of the magnesium
I hope this is correct or answers your question :)