Answer:
pH: 11
pOH: 3
Explanation:
NaOH is a strong base which means that it dissociates completely in water. It will break apart into Na⁺ and OH⁻ ions.
NaOH ⇒ Na⁺ + OH⁻
Because NaOH dissociates completely into its respective ions in water, the moles of NaOH is equal to the moles of hydroxide ions. So, [OH⁻] = 0.001 M.
Now to find the pOH, use the formula pOH = -log[OH⁻].
pOH = -log[OH⁻]
= -log(0.001)
= 3
The pOH of the solution is 3.
To find the pH, subtract the pOH from 14 since pH + pOH = 14.
14 - 3 = 11
The pH of the solution is 11.
Hope that helps.
Where does the half-reaction below occur in an electrochemical cell?
Fe(s) → Fe2+(aq) + 2e
O A. Anode
B. Salt bridge
C. Cathode
O D. Both electrodes
Almost done somebody please help me
The correct answer is A. It is uniform in composition and the parts that make up the mixture can be separated from one another through physical means.
Explanation:
In a homogeneous mixture, components are completely integrated, which means the final substance is uniform and the parts that compose it are not separated. This occurs in milk because this integrates uniformly water, fat, among others, and these elements cannot be observed separately.
Moreover, in mixtures, components can be separated through physical means; for example by heating the substances. This applies to milk because if it is heated water evaporates, and therefore can be separated.
What were the defects in Rutherford’s atomic model and how were these removed by Bohr?
What’s the capital city of Turkey?
Answer:
Ankara is the capital of Turkey! Hope this helped you out! :)
Explanation:
The capital of Turkey is Ankara
hopefully this helped :3
what is frezzing pointvof light
Answer:
Depends from where the light is
Explanation:
If it is in the north pole than it will be 0°C
Answer:
You cannot freeze light.
Explanation:
Only some scientists have been able to freeze light. But, they have only been able to freeze light for about 1 minute.
Most chemical bonds are
Select one:
O a purely ionic.
stion
O b. purely covalent.
O c. partly ionic and partly covalent.
Od, metallic.
Answer:
partly ionic and partly covalent
Recycling of aluminum beverage cans is an example of the fact that Group of answer choices decreasing entropy is a spontaneous process. increasing entropy is a spontaneous process. decreasing entropy is a nonspontaneous process. increasing entropy is a nonspontaneous process.
Answer:
The correct option is;
decreasing entropy is a nonspontaneous
Explanation:
Recycling of aluminium beverage cans involves the process of remelting scrapped beverage after the cans were first produced and used initially
1) The cans are cut into pieces so as to make them more compact and accessible for cleaning
2) The cans are then blocked and melted by heating and the impurities and hydrogen gas are removed
3) The composition of the molten aluminium alloy is altered by the addition of the alloy composition to get the right specification of the alloy
4) The molten alloy can then be sent for usage where it will be processed into solid aluminium objects without the requirement for much energy addition
By the second law of thermodynamics, processes 1, and 2 which involve the addition of energy from the surrounding to decrease the randomness of the scrapped beer cans such that the entropy of the surrounding decreases are not spontaneous processes, while process 4 where the molten aluminium will be cooled down to form solid aluminium does not require energy input but adds energy to the surrounding in the surrounding's entropy, is therefore a spontaneous process.
Therefore, decreasing the entropy of the universe by heating aluminium to melt it is a non spontaneous process
Air contains 78.08% nitrogen, 20.095% oxygen, and 0.93% argon. A sample of air occupies 8 L at 273 K and applies a pressure of 2.45 atm to its container. The sample of air is heated to 550 K, at which time it takes up 11.8 L. What is the partial pressure of nitrogen after the air has been heated? A. 2.61 atm B. 261.57 atm C. 282.16 atm D. 1.91 atm
Answer:
2.61 atmOption A is the correct option.
Explanation:
[tex] \frac{p1 \: v1}{t1} = \frac{p2 \: v2}{t2} [/tex]
[tex]p2 = \frac{p1 \: v1 \: t2}{t1 \: v2} [/tex]
[tex]p2 = \frac{2.45 \times 8 \times 550}{273 \times 11.8} [/tex]
[tex]p2 = 3.35 \: atm[/tex]
Partial pressure of N² :
[tex]3.35 \times \frac{78.08}{100} [/tex]
[tex] = 2.61 \: atm[/tex]
Hope this helps..
Best regards!!
Answer: 2.61 atm
Option A is the correct option.
....
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Polarity is important because polar and nonpolar molecules have different properties. Polar molecules interact(___?____) with other polar molecules but(__?____) interact with nonpolar molecules, and vice versa.
a) Strongly
b) do
c) do not
d) weakly
Polar molecules interact strongly with other polar molecules but do not interact with nonpolar molecules, and vice versa ,therefore option (a) and option (c) are correct .
What do you mean by polar molecules?A polar molecule is a chemical substance in which the distribution of electrons between the atoms involved is uneven, resulting in a dipole moment.
When a molecule or atom is said to have a polar bond, then the center of the negative charge will be on one side, whereas the center of positive charge will be on the other side. The complete molecule will be a polar molecule.
Polar molecules interact strongly with other polar molecules but do not interact with nonpolar molecules, and vice versa ,hence option (a) and option (c) are correct .
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How many atoms are in 10g of Al
Answer:
2.22 x 10²³
Explanation:
number of atoms = mole x 6 x 10²³first we have to find number of moles
moles = mass(g) / molar mass (Mr) (g/mol)mol = 10/27
mol= 0.37 mol
Now,
number of atoms = mole x 6 x 10²³
= 0.37 x 6 x 10²³
= 2.22 x 10²³
Name the hydro carbon. please guys, its really urgent.
Answer:
The given hydrocarbon is Glycerol
Based on my previous question I have posted.. Answer this.. It's the continuation
Table 7.3 is different
Answer:
We don't know what solvent X and solvent Y are, but from the chart, we can see that in solvent X, hydrochloric acid can conduct electricity (bulb lights up), and react with calcium carbonate.
So, we can say the electrical conductivity when HCl is dissolved in solvent X is high, and when HCl is dissolved in solvent Y, the electrical conductivity is low (because light bulb doesn't light up).
Additionally, in solvent X, HCl ionizes, this shows the property of acids: reacts with carbonates to give CO2 (because CO2 reacts with lime water to make it cloudy).
In solvent Y, HCl does not ionize, so there is no reaction between acid and calcium carbonate.
Q1. Because metals are malleable, we use some of them to make saucepans. Give two other examples of uses of metals that depend on: (a):their malleability. (b):their ductility. (c):their ability to conduct electricity. [3]
Explanation:
(a):their malleability:
>iron making. iron worker heat the meat and hammer it to give them the desired shape.
> in the jewelry making process, like the gold or silver you wear are results due to the malleability of metal
(b):their ductility:
>for the making of high tension cable that connects different cities for transferring of electricity.
>for making wire gauze
(c):their ability to conduct electricity:
>for lighting up your house with light bulbs
>for using cooking stoves
>to make refrigerator work.
Answer:
a)gold and silver-used to make jewellery
b)gold and copper(we draw them in wires easily because they are not brittle)
c)copper and iron(this is because both of them are metal and metaps are best conductors of electricity)
Explanation:
uses of copper- to make utensils
to make wires for circuits
uses of silver-to make jewellery
to make mirrors
malleability is the property of a meta in which the metal can be changed into different shapes.
Ductility-can be drawn into thin wires.
please what
is combustion
Answer:
when the coal is heat with presence of oxygen it's called combustion...
displacement reaction with example grade 10
Answer:
Displacement reactionWhen an atom or group of atoms in a molecule is replaced by another atom or group of atoms, such chemical reaction is called displacement reaction. Displacement reaction is of two types. They are:
Single displacement reactionDouble displacement reactionSingle displacement reactionWhen an atom in a molecule is replaced by another atom, such chemical reaction is called single displacement reaction.
For example:
Zinc + Hydrochloric acid → Zinc Chloride + Hydrogen
Zn + 2HCI → ZnCI₂ + H₂
Here, Zn is more reactive than H₂. So, Zn displaces H from the compound HCI.
Double displacement reactionA chemical reaction in which the molecules of the reactants get decomposed and exchange their corresponding ions to give new products is called a double displacement reaction.
For example:
AgNO₃ + NaCI → NaNO₃ + AgCI
Hope this helps..
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Given: K for acetic acid is 1.8 X 10–5You are titrating 0.108 M NaOH into 142.0 ml of acetic acid of unknown concentration. You have an indicator that will change color when equivalence is reached. At equivalence, you have added 72.0 ml of the base. Calculate molarity of the acid. What is the pH of the solution at the equivalence point? Now that you know the molarity of the acid, find pH when you mix 50.0ml of the acid with 75.0 ml of the same NaOH solution. Now you are working with different acid and base, both weak. K for the acid is 2.25 X 10-5. You mix 63 ml of 0.275 M acid with 55.0 ml of a weak base of concentration 0.188 M. Find pH
Answer:
Explanation:0.493 M NaOH means 0.493 mol NaOH/L
mols
mols = ------ x L
L
mols = M x V
In a titration procedure, 40.57 mL of 0.493 M NaOH solution was used. How many mols NaOH did this volume of NaOH solution contain?
mols = M x V
0.493 mols NaOH
mols = ----------------------- x 0.04057 L
L
mols = 0.0200 mols NaOH
The formula for sodium phosphate: NaPO4 Na(PO4)3 Na3PO4
Answer:
Na3 Po4
Explanation:
Na+1
Na+1
Na+1 = Na3
Po4 =
Na3Po4
Na[tex]_3[/tex]Po[tex]_4[/tex] is the formula for sodium phosphate. Sodium phosphates have a wide range of uses in food and water treatment.
What is sodium phosphate?Sodium phosphate is indeed a catch-all phrase for a number of sodium (Na+) as well as phosphate (PO43) salts. Phosphate also forms di-, tri-, tetra-, as well as polyphosphate families or condensed anions. The majority of these salts exist across both anhydrous (water-free) as well as hydrated forms. Hydrates are more prevalent than anhydrous forms.
Sodium phosphates have a wide range of uses in food and water treatment. Sodium phosphates, for example, are frequently employed particularly emulsifying agent (as in processed cheese), smoothing agents, especially leavening agents in baked products. Na[tex]_3[/tex]Po[tex]_4[/tex] is the formula for sodium phosphate.
Therefore, Na[tex]_3[/tex]Po[tex]_4[/tex] is the formula for sodium phosphate.
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The fact that a heat pump requires energy to move heat from a colder object (the outside of a house) to a hotter object (the inside of the house) is a real life observation of which thermodynamic law?
Answer:
The correct answer is - the second law of thermodynamics.
Explanation:
The second law of thermodynamics says that the in all heat energy exchange or transfer, and if there is no gain or lose of energy in a system, the potential energy of the particular state in that system will less than that of initial state of the system in any case.
It also suggests that the processes deals with the conversion of the heat energy are irreversible and the energy can be transfer from lower temperature system to higher temperate system without adding energy.
Thus, The fact that a heat pump requires energy to move heat from a colder object to a hotter object is a real life example of the second law of thermodynamics.
What does the pH of a solution have to be in order to be a base?
Answer:
pH
7.0 = neutral.
(7–14) = basic
(0–6) = acidic
Explanation:
Question 1 of 10
Which two terms apply to oceanic crust rather than continental crust?
A. Thicker
O B. Lighter in color
0 C. Denser
I D. Younger in age
The two terms apply to oceanic crust rather than continental crust C. Denser and D. Younger in age
What is the oceanic crust made up of?
Oceanic Crust Oceanic crust, extending 5-10 kilometers (3-6 kilometers) beneath the ocean floor, is mostly composed of different types of basalts. Geologists often refer to the rocks of the oceanic crust as “sima.” Sima stands for silicate and magnesium, the most abundant minerals in oceanic crust.
What is an example of oceanic crust?Oceanic crust is thin (6 km thick) and dense (about 3.3 g/cm), consisting of basalt, gabbro, and peridotite. They include oceanic sediments (e.g. radiolarites, turbidites) and oceanic crust (e.g. basalt, pillow lava).
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Acetic acid (CH3COOH) is a weak acid that partially dissociates in water. Given the reaction CH3COOH(aq) ↔ CH3COO−(aq) + H+(aq) and Kc = 1.8 x 10−5, if the concentration of the acetic acid is 0.016 M and the concentration of the acetate ion is 0.92 M, what is the [H+]?
Answer:
The correct answer is: 1.035 x 10⁻³ M
Explanation:
The dissociation equilibrium for acetic acid (CH₃COOH) is the following:
CH₃COOH(aq) ↔ CH₃COO⁻(aq) + H⁺(aq) Kc = 1.8 x 10⁻⁵
The expression for the equilibrium constant (Kc) is the ratio of concentrations of products over reactants. The products are acetate ion (CH₃COO⁻) and hydrogen ion (H⁺) while the reactant is acetic acid (CH₃COOH):
[tex]Kc=\frac{[CH_{3} COO^{-} ][H^{+} ]}{[CH_{3} COOH]}= 1.8 x 10^{-5}[/tex]
Given: [CH₃COOH]= 0.016 M and [CH₃COO⁻]= 0.92 M, we replace the concentrations in the equilibrium expression and we calculate [H⁺]:
[tex]\frac{(0.016 M)[H^{+} ]}{(0.92M)}= 1.8 x 10^{-5}[/tex]
⇒[H⁺]= (1.8 x 10⁻⁵)(0.92 M)/(0.016 M)= 1.035 x 10⁻³ M
What is the precipitate in the following reaction?
2AgNO3(aq) + Na2S(aq) → Ag2S(s) + 2NaNO3(aq)
Answer:
2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)
Explanation:
The final equation is
2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)
2Ag(+1)NO3(-1)(aq) + Na2(+1)S(-2)(aq) --> Ag2(+1)S(-2)(s) + 2Na(+1)NO3(-1)(aq)
AgNO3, Na2S, and NaNO3 are all strong electrolytes, so we immediately separate those, making the new equation:
2Ag(+1)(aq) + 2NO3(-1)(aq) + 2Na(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(s) + 2Na(+1)(aq) + 2NO3(-1)(aq)
After that, you cancel out all the ions that appear more than once, which in this case would leave us with a final equation of...
2Ag(+1)(aq) + S(-2)(aq) --> Ag2(+1)S(-2)(aq)
Answer:
Explanation:
C
Aqueous hydrochloric acid will react with solid sodium hydroxide to produce aqueous sodium chloride and liquid water . Suppose 1.82 g of hydrochloric acid is mixed with 0.88 g of sodium hydroxide. Calculate the maximum mass of sodium chloride that could be produced by the chemical reaction. Round your answer to significant digits.
Answer:
1.29 g of NaCl.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
HCl(aq) + NaOH(s) —> NaCl(aq) + H2O(l)
Next, we shall determine the masses of HCl and NaOH that reacted and the mass of NaCl produced from the balanced equation.
This is illustrated below:
Molar mass of HCl = 1 + 35.5 = 36.5 g/mol
Mass of HCl from the balanced equation = 1 x 36.5 = 36.5 g
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol
Mass of NaOH from the balanced equation = 1 x 40 = 40 g
Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol
Mass of NaCl from the balanced equation = 1 x 58.5 = 58.5 g
Summary:
From the balanced equation above,
36.5 g of HCl reacted with 40 g of NaOH to produce 58.5 g of NaCl.
Next, we shall determine the limiting reactant.
The limiting reactant can be obtained as follow:
From the balanced equation above,
36.5 g of HCl reacted with 40 g of NaOH.
Therefore, 1.82 g of HCl will react with = (1.82 x 40)/36.5 = 1.99 g of NaOH
From the calculations made above,
We can see that it will take a higher mass of NaOH i.e 1.99 g than what was given i.e 0.88 g to react completely with 1.82 g of HCl.
Therefore, NaOH is the limiting reactant and HCl is the excess reactant.
Finally, we shall determine the maximum mass of NaCl produced from the reaction.
In this case the limiting reactant will be used as it will produce the maximum mass of the products since all of it were consumed in the reaction.
The limiting reactant is NaOH and the maximum mass of NaCl produced can be obtained as follow:
From the balanced equation above,
40 g of NaOH reacted to produce 58.5 g of NaCl.
Therefore, 0.88 g of NaOH will react to produce = (0.88 x 58.5)/40 = 1.29 g of NaCl.
Therefore, 1.29 g of NaCl were produced from the reaction.
how is impure copper refined by electrolysis
Answer:
By giving electricity to copper compound solution.
Explanation:
Electrolysis is one of the major way of refined copper. The copper containing solution has two electrodes.i) positive electrodes called anode. ii) negative electrodes called cathode. When electricity is pass into the copper containing solution electrolysis process is starts and impure copper is formed in anode and pure copper is formed in cathode.
So, We can get pure copper in cathode through electrolysis.
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Ascorbic Acid is a organic compound with formula C6H8O6, originally called Hexuronic Acid. It's a white solid, but impure samples can be yellowish. It dissolves well in water to give mildly acidic solutions. It is a mild reducing agent.
What is the other name of Ascorbic Acid?
Explanation:
ascorbic acid is lemon
lemon contain ascorbic acid....
it is organic acid.....
A civil engineer chooses to use wooden beams because they will sag before
they break. This is an example of:
A. using a material for multiple applications.
B. choosing a material that will show warning before it fails.
C. using composite materials that combine strengths.
D. using design techniques that increase efficiency and reduce
costs.
Answer:
B. choosing a material that will show warning before it fails.
Explanation:
Answer:
APEX
Explanation:
B
what is the definition of carbohydrates
Answer:
carbohydrates are energy giving foods that warm the body and could be in different forms
Answer and Explanation:
Carbohydrates are a type of biomolecule that the body uses primarily for energy and/or structure. They usually consist of the elements carbon (C), hydrogen (H), and oxygen (O) in a 1 : 2 : 1 ratio. For example, glucose, a carbohydrate, is [tex]C_6H_{12}O_6[/tex].
Monomers of carbohydrates are called monosaccharides, and polymers are called disaccharides if two monosaccharides are combined and polysaccharides if more than two monosaccharides are put together.
Examples of carbohydrates are sugars, starches, cellulose, lactose, sucrose, etc.
For a first-order reaction, A → B, the rate coefficient was found to be 3.4 × 10-4 s-1 at 23 °C. After 5.0 h, the concentration of A was found to be 0.00018 mol L-1. What was the original concentration of A?
Answer:
the original concentration of A = 0.0817092 M
Explanation:
A reaction is considered to be of first order it it strictly obeys the graphical equation method.
[tex]k_1 = \dfrac{2.303}{t}log \dfrac{a}{a-x}[/tex]
where;
k = the specific rate coefficient = 3.4 × 10⁻⁴ s⁻¹
t = time = 5.0 h = 5.0 × 3600 = 18000 seconds
a = initial concentration = ???
a - x = remaining concentration of initial concentration at time t = 0.00018 mol L⁻¹
[tex]3.4 \times 10^{-4}= \dfrac{2.303}{18000}log \dfrac{a}{0.00018}[/tex]
[tex]3.4 \times 10^{-4}= 1.27944 \times 10^{-4} \times log \dfrac{a}{0.00018}[/tex]
[tex]\dfrac{3.4 \times 10^{-4}}{1.27944 \times 10^{-4}}= log \dfrac{a}{0.00018}[/tex]
[tex]2.657= log \dfrac{a}{0.00018}[/tex]
[tex]10^{2.657}= \dfrac{a}{0.00018}[/tex]
[tex]453.94 = \dfrac{a}{0.00018}[/tex]
[tex]a =453.94 \times 0.00018[/tex]
a = 0.0817092 M
Thus , the original concentration of A = 0.0817092 M
What do neurons and protons have in common?
Answer:
Protons and neutrons have almost the same mass and are both located in the nucleus of the atom
Answer:
Protons and neutrons have almost the same mass and are both located in the nucleus of the atom. Protons are charged particles. Neutrons are neutral particles. ... The positive charge of the protons in the nucleus is balanced by the negative charge of the electrons.
A. If both Assertion & Reason are true and the reason is the correct explanation of the assertion. B. If both Assertion & Reason are true but the reason is not the correct explanation of the assertion. C. If Assertion is true statement but Reason is false. D. If Assertion is false and Reason is true Assertion: .Formation of soluble products from insoluble ones is called precipitation. Reason : Precipitation involves formation of insoluble products from soluble ones
Answer:
D- Assertion is false and Reason is true
Explanation:
Precipitation is said to have occurred when an insoluble product is formed from soluble ones. Let us take an instance;
BaCl2(aq) + H2SO4(aq) -------> BaSO4(s) + 2HCl(aq)
The barium sulphate so formed is an insoluble product obtained from the reaction of soluble barium chloride and sulphuric acid. This is a typical example of a double replacement reaction as the both ions exchanged partners.
Thus, the assertion is false but the reason is true.