Answer:
Option (d) The milk is 10000 times more basic than the lemon juice.
Explanation:
The following data were obtained from the question:
pH of milk = 6
pH of lemon juice = 2
To know which option is correct, let us find the ratio of the concentration of Hydrogen ion, H+ of the the milk to that of the lemon.
This is illustrated below:
For milk:
pH = 6
Hydrogen ion concentration, [H+] =?
pH = –Log [H+]
6 = –Log [H+]
– 6 = Log [H+]
[H+] = Antilog (– 6)
[H+] = 1x10^-6 M
For lemon juice:
This is illustrated below
pH = 2
Hydrogen ion concentration, [H+] =?
pH = –Log [H+]
2 = –Log [H+]
– 2 = Log [H+]
[H+] = Antilog (– 2)
[H+] = 0.01 M
Next we shall determine the ratio of the concentration of Hydrogen ion, [H+] of milk to that of the lemon juice. This is illustrated below:
[H+] of milk : [H+] of lemon juice
[H+] of milk / [H+] of lemon juice
=> 1x10^-6 / 0.01
=> 1 / 10000
[H+] of milk : [H+] of lemon juice
=> 1 : 10000
Note: the higher the hydrogen ion concentration, [H+], the more acidic the substance will be and the lesser the hydrogen ion concentration, [H+], the more basic the substance will be.
From the above illustration, we can see that the milk is 10000 times more basic than the lemon juice..
Answer:
d
Explanation:
How many molecules would there be in 10.5 L of carbon dioxide at 40.0 C and 252 kPa
Answer:
6.14×10²³ molecules
Explanation:
Data obtained from the question include:
Volume (V) = 10.5L
Temperature (T) = 40°C
Pressure (P) = 252 kPa
Next, we shall determine the number of mole of CO2 present.
This can be obtained by using the ideal gas equation:
PV = nRT
Volume (V) = 10.5L
Temperature (T) = 40°C = 40°C + 273 = 313K
Pressure (P) = 252 kPa
Gas constant (R) = 8.31 KPa.L/Kmol
Number of mole (n) =.?
PV = nRT
252 x 10.5 = n x 8.31 x 313
Divide both side by 8.31 x 313
n = (252 x 10.5) /(8.31 x 313)
n = 1.02 mole
Therefore, 1.02 mol of CO2 is present.
Now, we can obtain the number of molecules of CO2 present as follow:
From Avogadro's hypothesis, 1 mole of any substance contains 6.02×10²³ molecules.
This means that 1 mole of CO2 also contains 6.02×10²³ molecules.
Now, if 1 mole of CO2 contains 6.02×10²³ molecules,
Then 1.02 mole will contain = 1.02 x 6.02×10²³ = 6.14×10²³ molecules.
Therefore, 6.14×10²³ molecules of CO2 is present.
If the pH of a solution is 7.6, what is the pOH? A. 6.4 B. 8.4 C. 5.4 D. 7.4
Answer:
6.4
Explanation: pH
+
pOH
=
14
So if
pH
=
7.6
then
pOH
=
14
−
pH
=
6.4
Explanation:
Wrote this out spaced so it's more clear.
What element has the electron configuration 1s^22s^22p^63s^23s^23p^4?
Answer: it’s S
Explanation:
The element with electronic configuration of 1s²2s²2p⁶3s²3p⁴ is sulphur (S)
The correct answer to the question is Option C. S
Electronic configuration is simply defined as the arrangement of electrons around the nucleus of an atom.
With the electronic configuration of an element, we can obtain the name of the element by simply obtaining the total number of electrons in the shells and comparing it with those in the periodic table.
From the question given above,
Electronic configuration => 1s²2s²2p⁶3s²3p⁴
Name of element =?Total electron = 2 + 2 + 6 + 2 + 4 = 16
Thus, the element has 16 electrons. This is assumed to be atomic number of the element.
Comparing the atomic number of the element (i.e 16) with those in the periodic table, the element is Sulphur with the symbol S.
Therefore, the element with electronic configuration of 1s²2s²2p⁶3s²3p⁴ is sulphur (S)
Option C. S gives the correct answer to the question.
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How is alchemy different from modern chemistry?
O A. Alchemy experiments only with living things, and chemistry uses
chemicals
O B. Alchemy was practiced before Aristotle, and chemistry has been
popular since his death.
C. Alchemy is not scientific, but chemistry is based on evidence.
O D. Alchemy covers all areas of science, but chemistry covers only
matter.
Answer:
C. Alchemy is not scientific, but chemistry is based on evidence.
Explanation:
Alchemy was based on mystical beliefs instead of the scientific method.
Chemistry is the study of matter and change based on evidence.
Pretend that unbinilium has an atomic mass of 299.01 amu. It is a group 2A element.
In the future, a local scientist reports that they have successfully synthesized 0.0295 moles of unbinilium. How many grams of unbinilium is this?
Do not enter units.
Answer:
8.82g
Explanation:
Determine the [H+] or [OH−] for each of a solutions at 25°C.
Solution B: [H3O+] = 9.99 x 10^-9 M
Solution B: [OH-] = ?
Solution C: [H3O+] = 0.000777 M
Solution C: [OH-] = ?
Answer:
Solution B: [OH-] = 1×10^–6 M
Solution C: [OH-] = 1×10^–6 M
Explanation:
Solution B:
Hydronium ion concentration, [H3O+] = 9.99×10^–9 M
Hydroxide ion concentration, [OH-] = ?
The Hydroxide ion concentration, [OH-] can be obtained as follow:
[H3O+] × [OH-] = 1×10^–14
9.99×10^–9 × [OH-] = 1×10^–14
Divide both side by 9.99×10^–9
[OH-] = 1×10^–14 / 9.99×10^–9
[OH-] = 1×10^–6 M
Therefore, the Hydroxide ion concentration, [OH-] is 1×10^–6 M
Solution C:
Hydronium ion concentration, [H3O+] = 0.000777 M
Hydroxide ion concentration, [OH-] = ?
The Hydroxide ion concentration, [OH-] can be obtained as follow:
[H3O+] × [OH-] = 1×10^–14
0.000777 × [OH-] = 1×10^–14
Divide both side by 0.000777
[OH-] = 1×10^–14 / 0.000777
[OH-] = 1.29×10^–11 M
Therefore, the Hydroxide ion concentration, [OH-] is 1.29×10^–11 M
How many grams of N2 can be produced when 6.50 g of O2
reacts?
Answer:
3.79 g of N2.
Explanation:
We'll begin by writing the balanced equation for the reaction.
This is given below:
4NH3 + 3O2 → 2N2 + 6H2O
Next, we shall determine the mass of O2 that reacted and the mass of N2 produced from the balanced equation.
This is illustrated below:
Molar mass of O2 = 16x2 = 32 g/mol
Mass of O2 from the balanced equation = 3 x 32 = 96 g
Molar mass of N2 = 2x14 = 28 g/mol
Mass of N2 from the balanced equation = 2 x 28 = 56 g
Summary:
From the balanced equation above,
96 g of O2 reacted to produce 56 g of N2.
Finally, we shall determine the mass of N2 produced by reacting 6.50 g of O2.
This can be obtained as follow:
From the balanced equation above,
96 g of O2 reacted to produce 56 g of N2.
Therefore, 6.50 g of O2 will react to produce = (6.50 x 56)/96 = 3.79 g of N2.
Therefore, 3.79 g of N2 were obtained from the reaction..
2. If the reaction of 5.75 moles of sodium with excess hydrofluoric acid is able to produce 2.49 mol H2, what is the percent yield of hydrogen gas?
Unbalanced equation:
Na + HF –> NaF + H2
94.2%
86.5%
43.3%
23.1%
Answer:
86.5%
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
2Na + 2HF –> 2NaF + H2
Next, we shall determine the theoretical yield of the hydrogen gas, H2. This is illustrated:
From the balanced equation above,
2 moles of Na reacted to produce 1 mole of H2.
Therefore, 5.75 moles of Na will react to produce = (5.75 x 1)/2 = 2.88 moles of H2.
Therefore, the theoretical yield of Hydrogen gas, H2 is 2.88 moles.
Finally, we shall determine the percentage yield of Hydrogen gas, H2. This can be obtained as follow:
Actual yield of H2 = 2.49 moes
Theoretical yield of H2 = 2.88 moles
Percentage yield of H2 =.?
Percentage yield = Actual yield /Theoretical yield x 100
Percentage yield = 2.49/2.88 x 100
Percentage yield = 86.5%
Therefore, the percentage yield of Hydrogen gas, H2 is 86.5%.
plz help!!!!!!
This equation for the reaction when solid magnesium and solid lead (II) oxide are heated together is:
Mg(s)+Pb(s) => MgO(s)+Pb(s)
a)what does tell you about the position of lead in the reactivity series? explain your answer.
b)rewrite equation as an ionic equation
this shows that magnesium is higher in the reactivity series than lead.
I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.
Reactivity series is the progression of the metals based on the activity. In a reaction between magnesium and lead (II) oxide, it can be said that lead is at a lower position in the reactivity series.
What is reactivity series?Reactivity series is the depiction of the metals in a decreasing order based on their ability to displace the other metal in the reaction. More reactive species are placed at the upper position, while the less reactive species are placed at the lower positions.
In the series, magnesium is placed at the upper part of the series and has high reactivity, whereas lead is placed at the lower level with low reactivity. hence, in the reaction, Mg replaces Pb and forms a bond with oxygen.
The reaction between magnesium and lead (II) oxide cannot be written in the ionic form as all the reactants and the products are in the solid state and not in an aqueous state.
Therefore, lead is at a lower level of reactivity series.
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WILL GIVE BRAINLiest
!!!! What is the electron configuration of the gallium ion? -1 s 22 s 22 p 63 s 23 p 6 -1 s 22 s 22 p 63 s 23 p 54 s 1 -1 s 22 s 22 p 63 s 23 p 63 d 10 -1 s 22 s 22 p 63 s 23 p 64 s 24 p 6
Answer:
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
Explanation:
By far, the most common ion of group 13 metals are 3+ .
So the common gallium ion is Ga³+ and it's electron configuration is [Ar] 3d10.
Hope it helps.
We can see here that the correct electron configuration of the gallium ion (Ga^3+) is: 1s^2 2s^2 2p^6 3s^2 3p^6
What is electron configuration?Electron configuration refers to the distribution of electrons in the electron shells and subshells of an atom. It is a fundamental concept in atomic structure and describes how electrons occupy specific energy levels around the nucleus of an atom.
When gallium loses three electrons to form a +3 ion (Ga^3+), it becomes a cation. The electron configuration of a neutral gallium atom is 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4s^2 4p^1.
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A ball that has a mechanical energy of 65J has 12J of kinetic energy the ball has ....... of potential energy
Answer:
53J
Explanation:
Total Energy is the sum of Kinetic energy and potential energy.
Given the following thermochemical data C(s) + ½O2(g) ---> CO(g) ∆H1 = -111 kJ/mol C(s) + O2(g) ---> CO2(g) ∆H2 = -395 kJ/mol What is the ∆Hr for the reaction: CO(g) + ½O2(g) ---> CO2(g) ∆Hr = ?
Answer:
The enthalpy of the reaction asked is -284 kJ/mol.
Explanation:
Given:
[tex]C(s) + \frac{1}{2}O_2(g)\rightarrow CO(g), \Delta H_1 = -111 kJ/mol [/tex]..[1]
[tex]C(s) + O_2(g)\rightarrow CO_2(g) \Delta H_2 = -395 kJ/mol[/tex]...[2]
To find ; [tex]\Delta H_{rxn}[/tex] of following reaction :
[tex]CO(g) + \frac{1}{2}O_2(g)\rightarrow CO_2(g), \Delta H_{rxn} =?[/tex]..[3]
Using Hess's Law:
[2] - [1] = [3]
[tex]\Delta H_{rxn}=\Delta H_2-\Delta H_1=-395 kJ/mol-(-111 kJ/mol)=-284 kJ/mol[/tex]
The enthalpy of the reaction asked is -284 kJ/mol.
The reaction of hydrogen with oxygen produces water.
2H2(g) + O2(8) - 2H2O(g)
a. How many moles of O2 are required to react with 2.6 mol
of H2?
b. How many moles of H, are needed to react with 5.0 mol
of O2?
c. How many moles of H2O form when 2.5 mol of O2
reacts?
Which lifestyle is most likely to lead to infertility in a male ?
A man who works as a mechanic
A man who works as a computer programmer and sits at desk magority of the day
A semi professional athlete
A man who works for a company’s that applies pesticides to lawns
Answer:
The second on, A man who works as a computer programmer and sits at desk magority of the day.
Explanation:
Answer:
Explanation:
The only answer I can think as being possible is the last one. Pesticides are chemicals that go after unwanted animal life. They do not know that they should not attack human beings.
Infertility could very well be one of the side effects of a pesticide. There are others as well. Some pesticides go after the central nervous system (think mice and rats) and those are dangerous to use and to leave around.
The others all involve occupations that either require authentic abilities or mental astuteness. Neither should affect a man's ability to reproduce.
(Blank) tells you that the exact momentum and position of a particle can't be known at the same time.
A. The Schrodinger equation
B. Quantum mechanics
C. The uncertainty principle
D. Particle-wave duality
Answer:
The uncertainty principle
Explanation:
Essentially if you measure the momentum of the particle at a given point, then when you go to measure the position it has moved, thus you don't know the position. Vise versa if you measure the position you only capture a still frame of the particle and no information about it's momentum, which will have changed.
Answer: the uncertainly principle
Explanation:
it basically states you can not know both at the same time
When dissolved in water, an acid or a base breaks down into a proton and an electron. two negative ions. a positive and a negative ion. a positive ion and a proton.
Answer:
got c
Explanation:
When dissolved in water, an acid or a base breaks down into a positive and a negative ion.
What is an acid-base reactions?
An acid–base reaction is a chemical reaction that occurs between an acid and a base. Acid-base reactions can be used to determine pH.
When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge, whereas, bases, when dissolved in water yield hydroxide ions (OH-).
If a solution has a high concentration of H+ ions, then it is acidic whereas the solution having high concentration of OH- ions, called as basic.
Thus, from above , it is clear that when dissolved in water, an acid or a base breaks down into a positive and a negative ion.
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What are thermal plasmas?
plasmas that have particles that collide infrequently
plasmas that reach a temperature equal to their surroundings
plasmas that do not reach thermal equilibrium
plasmas that have only a few particles ionized at any given mom
Answer:
B
Explanation:
Mass box A = 10 grams; Mass box B = 5 grams; Mass box C-made of one A and one B
How many boxes of B would be required to make 30 grams of C?
hy
Answer:
2 boxes
Explanation:
==>Given that:
Box A = 10 grams
Box B = 5 grams
Box C= 1 A and 1 B = 15 grams
==>Required:
Number of boxes of B that would make 30 grams of C
==>Solution:
We know that, 1 box of B would give us 15grams of of C when mixed in the right proportion with 1 box of A.
thus,
1 box of B => 15 grams of C
x box of B => 30 grams of C
Therefore x = (30*1)/15
x = 30/15
x = 2
2 boxes of B would be required to make 30 grams of C
Hi :) how to do 4(b)?
Answer:
they produce water and a neutral ionic compound called a salt. The reaction is called a neutralization reaction.
Explanation:
? Question
Select the correct answer.
Which statement about mass wasting is correct?
O Mass wasting is rocks moving downhill.
o Earthquakes cause all mass wasting.
O Gravity drives all mass wasting.
O All mass wasting happens on mountains.
Answer:
Gravity drives all mass wasting.
Explanation:
Mass wasting can be defined as the process of wasting away of earth's outer crust. This movement is also known as slope movement that causes large rock, soil, and debris to move downward, a force driven by gravity.
The term is often used interchangeably with landslide yet it is different. It is also known as mass movement as is cause massive downslope movement of rock, regolith, snow, ice, and-the-like on the earth's outer crust.
All these movements are driven mainly by gravity. Gravity consantly tries to pull the rocks and soil down the slope but the resisting power. also known as shear strength, of moutains helps them to deny the gravitional force.
Thus from the given options the statement that can be said to be true about mass wasting is that mass wasting is driven by gravity. So, the correct option is C.
Answer:
C. Gravity drives all mass wasting.
Explanation:
Plato answer
How many Liters of 18 M H2SO4 are needed to make 0.5 L of 1.5 M H2SO4
Answer:
0.04 L
Explanation:
The following data were obtained from the question:
Concentration of stock solution (C1) = 18M
Volume of stock solution needed (V1) =?
Concentration of diluted solution (C2) = 1.5M
Volume of diluted solution (V2) = 0.5L
The volume of the stock solution needed can be obtain by using the dilution formula.
This is illustrated below:
C1V1 = C2V2
18 x V1 = 1.5 x 0.5
Divide both side by 18
V1 = (1.5 x 0.5)/18
V1 = 0.04L
Therefore, the volume of the stock solution needed is 0.04L.
SERE
What type of energy is the sum of an object's potential and kinetic energy?
mechanical energy
electromagnetic energy
chemical energy
thermal enemy
Answer:
Mechanical energy
Answer:
Mechanical Energy
Explanation:
The mechanical energy is the sum of the objects potential energy (energy the object possess due to its position) and its kinetic energy (energy the object possess due to its motion). Adding this two energies together, gives the total mechanical energy.
The functional group for an ester is: RCHO RCOOH RCOOR ROH
Answer:
RCOOR
Explanation:
Odyssey ware
RCOOR is the functional group for an ester. An ester is an organic molecule created when an acid and an alcohol interact. The general structure of the compound is RCOOR, where R is an aryl or alkyl group.
What is the way for the structure ?This functional group is made up of an alkyl or aryl group (R) and a carbonyl group (C=O) linked to an oxygen atom. Two additional carbon atoms, one of which is a member of the carbonyl group and the other of which is a member of the alkyl or aryl group, are joined to the oxygen atom.
The connection between the oxygen atom and the hydrogen atom of the acid is broken during the interaction of an acid with an alcohol to create an ester.of a fresh connection between the oxygen atom and the alcohol's alkyl or aryl group. As a result, the RCOOR functional group is created.
Esters are significant organic substances with many different uses. They serve as solvents and are employed in the synthesis of flavours, perfumes, polymers, medicines, and other products. They are also employed in the creation of fragrances and cosmetics, as well as as lubricants. Other organic compounds can be made using esters as intermediates.
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Scientists hypothesize that a certain species of animal existed in the past.
But, fossils of the species have never been found. Which two statements
could explain why?
A. There were very few members of the species.
B. Their bodies decomposed quickly.
O C. Their bodies contained radioactive atoms.
D. Minerals seeped into their bones.
SUBMIT
Answer: Fossils of the species have never been found because:-
a. There were few members of the species.
d. Their bodies decompose quickly.
For an organism to become fossil it is important that it do not decompose before it get buried by sediments.
What are fossils?
A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.
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Answer: The answer is B and A.
Explanation:
I took the test!
Nitrogen dioxide and water react to produce nitric acid, HNO3,
and nitrogen oxide.
3NO2(g) + H2O(l) — -→ 2HNO3(aq) + NO(g)
a. How many grams of H20 are required to react with 28.0 g
of NO2?
b. How many grams of NO are produced from 15.8 g of H2O?
c. How many grams of HNO3 are produced from 8.25 g of NOZ?
Answer:
Explanation:
a )
3NO₂(g) + H₂O(l) — -→ 2HNO₃(aq) + NO(g)
3 x 46 g 18 g 2 x 63 g 30 g
138 g of NO₂ requires 18 g of H₂O
28 g of NO₂ requires ( 18 / 138) x 28
= 3.65 g of H₂O.
b )
18 g of H₂O produces 30 g of NO gas
15.8 g of H₂O produces ( 30/18 ) x 15.8
= 26.33 g of NO gas .
c )
138 g of NO₂ produces 126 g of HNO₃
8.25 g of NO₂ produces (126 / 138 ) x 8.25
= 7.53 g of HNO₃
find the ph of o.o3 h2so4
Answer: 1.5
Explanation:
The pH of a solution is given by the formular; pH = - log [ H+ ]. Therefore, for H2SO4, it is;
pH = - log [ 3 x 10 ∧ -2]
= 2 - log 3
= 2 - 0.4771 = 1.5 approximately
1. A 10.0 g sample of propane, C3H8, was combusted in a constant-volume bomb
calorimeter. The total heat capacity of the bomb calorimeter and water was 8.0
kJ/°C. The molar heat of combustion of propane is -2 222 KJ/mol. If the starting
temperature of the water was 20 °C, what will be the final temperature of the
bomb calorimeter?
Answer:
The final temperature of the bomb calorimeter is 82.98°C
Explanation:
The given information are;
The mass of the propane sample = 10.0 g
The heat capacity of the bomb calorimeter = 8.0 kJ/°C
The molar heat of combustion of propane is -2,222 kJ/mol.
The starting (initial) temperature of the water, T₁ = 20°C
The final temperature of the bomb calorimeter = T₂
The molar mas of propane = 44.1 g/mol
The number of moles, n, of propane present in 10.0 g of propane is found as follows;
[tex]Number \ of \ moles \ of \ propane, \ n = \dfrac{Mass \ of \ propane}{Molar mass \ of \ propane} = \dfrac{10}{44.1} = 0.227 \ moles[/tex]Which gives;
The heat, Δh, released from the combustion of 10.0 g of propane = 0.227 × -2222 kJ/mol
Δh = -503.85 kJ/mol
Heat gained by the calorimeter = Heat released from the combustion of 10.0 g of propane = 503.85 kJ/mol
Change in heat, Δh[tex]_c[/tex] in the calorimeter = Heat capacity × Temperature change
Δh[tex]_c[/tex] = m × C
503.85 kJ/mol = 8.0 kJ/°C × (T₂ - 20°C)
T₂ = -503.85 kJ/mol/(8.0 kJ/°C) + 20°C = 82.98°C
The final temperature of the bomb calorimeter = 82.98°C
How do you know there was a chemical reaction?
Answer:
depends
Explanation:
because different chemicals can react they all have different ways of showing a reaction. an example is given: color, odor, texture weight solidity
Answer:
U will know there is a chemical reaction, when light, heat, color change, gas production, odor, or sound. The starting and ending materials of a physical change are the same
Explanation:
Consider 4.10 L of a gas at 365 mmHg and 20. ∘C . If the container is compressed to 2.20 L and the temperature is increased to 40. ∘C , what is the new pressure, P2, inside the container? Assume no change in the amount of gas inside the cylinder. Express your answer with the appropriate units.
Answer:
0.955 atm
Explanation:
We apply this formula derivated from the Ideal Gases Law
P₁ . V₁ / T₁ = P₂ . V₂ / T₂
We need to convert the temperature to absolute values
20°C + 273 K = 293K
40°C + 273 K = 313 K
Now we make a convertion for the pressure unit:
365 mmHg . 1 atm / 760 mmHg = 0.480 atm
We replace data:
(0.480 atm . 4.10L) / 293 K = (P₂ . 2.20 L) / 313K
[(0.480 atm . 4.10L) / 293 K] . 313 K = P₂ . 2.20 L
2.10 L.atm = P₂ . 2.20 L → P₂ = 2.10 L.atm/2.20L ⇒ 0.955 atm
A sample of carbon dioxide occupies 10.0 L under STP conditions. At what pressure wouldcthis same sample have a volume of 12.5 L and a temperature of 20.0oC?
Answer: 0.859 atm
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas (STP) = 1 atm
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas (STP) = 10.0 L
[tex]V_2[/tex] = final volume of gas = 12.5 L
[tex]T_1[/tex] = initial temperature of gas (STP) = 273K
[tex]T_2[/tex] = final temperature of gas = [tex]20.0^0C=(273+20)K=293K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{1\times 10.0}{273}=\frac{P_2\times 12.5}{293}[/tex]
[tex]P_2=0.859atm[/tex]
Thus at 0.859 atm , same sample have a volume of 12.5 L and a temperature of [tex]20.0^0C[/tex]