Answer:
Its A
Explanation:
It you look at a wavelength chart, it would show you the rate at which the light travels, from its distance. Which means there has to be two points to calculate it.
By titration, it is found that 68.1 mL of 0.143 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
Answer:
Easy question to answer, you have the concentration and volume of the base and you have the volume of the acid. You need to find the concentration of the acid. C1V1 = C2V2 equation can be used here
Explanation:
Volume of NaOH = 0.0681 L (change mL into L)
Concentration or Molarity of NaOH = 0.143 mol/L
Volume of HCl = 0.025 L (change mL into L)
Concentration or Molarity of HCl = ???
C1V1 = C2V2
Rearrange equation to find C2
(C1 * V1) / V2 = C2
(0.143 * 0.0681) / (0.025)
C2 = 0.389532
Concentration or Molarity of HCl = 0.389 mol/L
Draw the dot structure of CX4
Refer to the attachment
For each of these equations, predict the effects of temperature on the spontaneity of the reaction.
2N2O(g) → 2N2(g) + O2(9)
AH<0; AS > 0
A
H
A
S
AG
Spontaneity
+
+
H20(1) ► H2O(9)
AH> 0; AS >
-
+
302(9) ► 203(9)
AH >0; AS < 0
+
+ or -
nonspontaneous for
all T
spontaneous for all T
spontaneous at high
т
nonspontaneous at
low T
spontaneous at low T
nonspontaneous at
high T
C(s) + 2Cl2(g) → CCl4(9)
AH<0; AS < 0
+ or -
DONE
The spontaneity of a reaction depends on the temperature, enthalpy and entropy.
What is spontaneity of a reaction?A reaction is said to be spontaneous if it can proceed on its own without a further input of energy.
In the first case, when the enthalpy is less than zero and the entropy is greater than zero, the reaction is spontaneous at all temperatures.
In the second case, when the enthalpy greater than zero and the entropy is greater than zero, the reaction needs to proceed at high temperatures to be spontaneous.
In the third case, when the enthalpy is greater than zero and the entropy is less than zero, the reaction ought to proceed at low temperature in order to be spontaneous.
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Answer:
1.Spontaneous at all temperatures
2. Spontaneous only at high temperatures
3. Non spontaneous at all temperatures
4. Spontaneous only at low temperatures
Explanation:
Just did it on edge
Which layer of Earth is responsible for the movement of tectonic plates?
When sodium hydroxide is dissolved in water within a beaker, you observe that the beaker becomes warm. This situation illustrates:
When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.
WHAT IS A CHEMICAL REACTION:A chemical reaction is a type of reaction that involves the rearrangement of atoms to form new substances.
The indications that a chemical reaction has occurred is:
Color Change.Production of an odor.Change of Temperature.Evolution of a gas (formation of bubbles)Precipitate (formation of a solid)Therefore, When sodium hydroxide is dissolved in water within a beaker, it is observed that the beaker becomes warm due to chemical reaction.
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1. (2) Which quantum state can not exist?
A
(1, 0, 0, 1/2)
B
(2, 0, 0, -1/2)
c
(2, 1, 0, 1/2)
D
(2,0, 1, -1/2)
Answer:
D
Explanation:
Reason being that if the principal quantum number is 2, the azimuthal quantum number can either be 0 or 1, and in this case it's 0. Since the azimuthal is 0 the magnetic quantum number must definitely be 0, not 1.
The nuclei of Three naturally occurring magnesium isotopes have the same number of protons but different numbers of neutrons . Explain Why ? Why does every atom of barium have 56 protons and 56 lectrons? Which subatomic particles in an atom determine its mass number ?
Based on atomic properties and structure:
Isotopes have the same proton number(atomic number) but different neutron numbers. An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.The mass number of an atom is determined by the sum of protons and neutrons.What are isotopes?Isotopes are atoms of an element having the same atomic number but different mass numbers.
The difference in mass number is dues to different neutron numbers.
However, because they have the same proton number, they are atoms of the same element.
Neutral atoms contains equal number of protons and electrons.
An atom of barium has 56 protons and 56 neutrons in order to maintain electrical neutrality.
The mass number of an atom is determined by the sum of protons and neutrons.
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2Ca (PO.)2 + 6SiO2 + 10C - 6Casio, + PA+10CO
Starting with 700.0 grams of calcium phosphate and assuming excess silicon dioxide and carbon,
how many moles of phosphorus will be produced?
Taking into account the reaction stoichiometry, 0.1129 moles of P₄ is required to react with with 700.0 grams of calcium phosphate.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Ca₃(PO₄)₂ + 6 SiO₂ + 10 C → 6 CaSiO₃ + 10 CO + P₄
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca₃(PO₄)₂: 2 moles SiO₂: 6 moles C: 10 moles CaSiO₃: 6 moles CO: 10 molesP₄: 1 moleThe molar mass of the compounds is:
Ca₃(PO₄)₂: 310 g/moleSiO₂: 60 g/mole C: 12 g/moleCaSiO₃: 116 g/moleCO: 28 g/moleP₄: 124 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Ca₃(PO₄)₂: 2 moles ×310 g/mole= 620 gramsSiO₂: 6 moles ×60 g/mole= 360 grams C: 10 moles ×12 g/mole= 120 gramsCaSiO₃: 6 moles ×116 g/mole= 696 gramsCO: 10 moles ×28 g/mole= 280 gramsP₄: 1 mole ×124 g/mole= 124 gramsMoles of phosphorus P₄ producedThe following rule of three can be applied: If by reaction stoichiometry 620 grams of Ca₃(PO₄)₂ produces 1 mole of P₄, 70 grams of Ca₃(PO₄)₂ produces how many moles of P₄?
[tex]moles of P_{4} =\frac{70 grams of Ca_{3}(PO_{4} )_{2}x1 mole of P_{4} }{620 grams of Ca_{3}(PO_{4} )_{2}}[/tex]
moles of P₄= 0.1129 moles
Finally, 0.1129 moles of P₄ is required to react with with 700.0 grams of calcium phosphate.
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Q4: People have concerns about the use of slash and burn partly because it affects the carbon cycle in multiple ways. What are two of those ways
From what we know, we can confirm that people have concerns about the use of slash and burn because it creates more CO2 and decreases the natural ability to remove it from the air.
Why is slash and burn so environmentally harmful?This has to do with CO2 emissions. The slash and burn technique involves slashing away and burning large areas of green land in order to create farmland. This creates large amounts of CO2 through combustion that are released into the atmosphere. This also removes plants that act as a natural filter for CO2 in the atmosphere, limiting the possibility of a natural recovery.
Therefore, we can confirm that People have concerns about the use of slash and burn because it creates more CO2 and decreases the natural ability to remove it from the air.
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when an impurity is added to pure water what happens to the boiling point of the mixture?
Boiling point of water is 100 degree Celsius at mean sea level. Boiling point is related to the vapour pressure of the solution. On adding an impurity, the vapor pressure of solution decreases. With an increase in concentration of solute, vapour pressure decreases, hence boiling point increases
why is water called a liquid ?
Answer: A liquid takes the shape of its container. Such as a cup with water. It has no definite shape. It has a definite volume.
30) The number of calories needed to raise the temperature of 32 g of water from 12°C to 54 °C is A) 380 cal B) 1.3 cal C) 1300 cal D) 1700 cal E) 0.76 cal
So what is the easiest thing for each group to do in order to be "happy"?
Group 1:
Group 2
Group 13:
Group 14:
Group 15:
Group 16:
Group 17:
Group 18:
Answer:
cooperate and share ideas between each other and put people with people they know well or work well with.
Explanation:
Why is nitrate important in the ocean? How is it used biologically in the ocean?
Why are humans more susceptible to concussions than bighorn sheep and woodpeckers?
Answer:
there is a gap in the human brain and the skull filled with fluid. woodpecker and bighorn sheep do not have this, so the brain doesn't recoil and hit the skull.
how many grams of CaO (mm=56 grams) would be produced from 25.2 grams of CaCo3 (MM=100 grams)
Explanation:
CaCO3 = CaO + CO2
1mol. 1 mol
100. 56
1 ×100. 1 × 56
100. 56
100g of CaCO3 produces 56g of CaO
25.2g of CaCO3 produces x
x = 25.2 ×56
100
x =14.112g of CaO
Which statement is true about the temperature and density of air?
Answer: Normally I would need more info but I believe the answer is -Higher temperature air is less dense.
Explanation:
Took The Same Quiz!
What would a possible length for the missing
side length?
16
8
Answer:
24
Explanation:
the total of any 2 sides must be larger than the 3rd side. x is the 3rd side.
8 + x > 16
x > 8
16 + x > 8
x > -8
8 + 16 > x
24>x
x < 24
the second inequality tells us nothing as sides must be positive.
the third side must be between 8 and 24
How is the energy for this process stored?
a) A generator converts solar energy into electricity. Electricity is used to power a
watering system.
b) Electricity powers a watering system. Water flows from the reservoir to the sea
turning a generator which makes electricity.
c) Electricity is used to pump the water from the sea to the reservoir. Water flowing back
down drives a generator which makes electricity.
d) A generator converts solar energy into electricity used to pump water from the sea to
the reservoir.
Answer:
d)A generator converts solar energy into electricity usee to pump water from the sea to the resevoir
A generator converts solar energy into electricity used to pump water from the sea to the reservoir. So, option D is correct.
What is solar energy ?Solar energy works by transforming solar energy into power. Electricity and heat are the two energy types that the sun produces for human use.
Both are produced using solar panels, which may be found on everything from home rooftops to vast "solar farms" covering acres of rural land.
Solar energy is electrical energy produced directly from sunshine. Solar energy can be utilized to generate electricity or thermal energy. Sustainable Energy We don't use any of the Earth's resources, like coal or oil, when we use solar electricity.
Solar energy is a key energy source in the transition to the creation of clean energy since the sun produces more energy than humans could ever require.
Thus, option D is correct.
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Given the following equation: 2H2O 2H2 +0g What mass of oxygen would form from 5 moles of water?
Answer:
Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.
Explanation:
The following molecular equation represents the reaction that occurs when aqueous solutions of silver(I) nitrate and barium chloride are combined.
[tex]2AgNO3(aq) + BaCl2(aq) ⮕2AgCl(s) + Ba(NO3)2(aq)[/tex]
Write the balanced net ionic equation for the reaction.
(Use the lowest possible coefficients. Be sure to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
Answer:
Hey, I hope this helps. You gave the equation already balanced so there was no need to do so, the next thing we need to do after balancing is to split the strong electrolytes into ions. Once that is completed we cross off any reoccurring ions. That leaves us with our complete net ionic.
I also recommend you check out Wayne Breslyn on Yt. He is so helpful with equations like these.
Which requires a chemical reaction to form?
O A. a mixture
B. a compound
O c. a solution
O D. a metal
Someone can help me please??
Explanation:
tbh I really don't know but
A reaction of the form
aA - Products
gives a plot of 1/[A] vs time (in seconds) which is a straight line with a slope of 4.15 x 103. Assuming [A]o = 0.100 M, calculate the time in seconds) required
for the reaction to reach 38.3 percent completion.
The time taken for the second order reaction is 1494 seconds.
What is a second order reaction?A second order reaction is one in which a plot of the inverse of the concentration of a reactant versus time is a straight line and gives the slope of k which is the rate constant.
The formula for a second order reaction is;
1/[A] = kt + 1/[A]o
[A]o = 0.100 M
[A] = 0.100 M - (0.383 × 0.100 M) = 0.0617 M
k = 4.15 x 10^-3
t = ?
t = (0.0617 M)^-1 - ( 0.100 M)^-1/4.15 x 10^-3
t = 16.2 - 10/4.15 x 10^-3
t = 1494 seconds
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Copper can have improved wear resistance if alloyed with ceramic alumina, Al2O3. If a copper alloy has 7.7 wt % Al2O3, what is its composition in mol %?
The composition in mol% of the elements are :
4.91% of Al₂O₃ in alloy 95.08% of Cu in alloyGiven data :
Weight percentage of copper alloy = 7.7 wt %
Assume weight of alloy = 100 grams
Applying the weight percentagemass of Al₂O₃ in alloy = 7.7 gm
Mass of Cu in alloy = 100 - 7.7 = 92.3 gm
First step : calculate the mole of elements
i) moles of Al₂O₃ in alloy
= mass of Al₂O₃ in alloy / Atomic mass of Al₂O₃
= 7.7 gm / 102 gm/mol
= 0.075 mol
ii) moles of Cu in alloy
= mass of Cu in alloy / Atomic mass of Cu
= 92.3 gm / 63.5 gm/mol
= 1.45 mol
Therefore the total number of moles in the alloy = 0.075 + 1.45 = 1.525
Next step : Determine the mole percentages
i) Mole percentage of Al₂O₃ in alloy
= ( 0.075 ) / 1.525 * 100
= 4.91%
ii) Mole percentage of Cu in alloy
= ( 1.45 ) / 1.525 * 100
= 95.08%
Hence we can conclude that The composition in mol% of the elements are : 4.91% of Al₂O₃ in alloy and 95.08% of Cu in alloy.
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An object is accelerated from rest to a speed of 50m/s in 10 seconds. The acceleration of the object is?
Answer:
dasdw
Explanation:
1. A 0.338-g sample of antimony was completely reacted with 0.295 g of chlorine gas to form antimony chloride. Determine the empirical formula of the antimony chloride.
The empirical formula of the antimony chloride is SbCl₃
Data obtained from the question Antimony (Sb) = 0.338 gChlorine (Cl) = 0.295 gEmpirical formula =? How to determine the empirical formulaDivide by their molar mass
Sb = 0.338 / 122 = 0.0028
Cl = 0.295 / 35.5 = 0.0083
Divide by the smallest
Sb = 0.0028 / 0.0028 = 1
Cl = 0.0083 / 0.0028 = 3
Thus, the empirical formula of the compound is SbCl₃
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You see a boat sitting at the end of a dock. Ten minutes later you see the same boat in a cove to the right of the dock You did not see the boat move.
However, you know that the boat moved because its
relative to the dock changed.
No action is required. The sailboat should change course and speed.
I NEED TOUR HELP, PLEASE.
G. A gas is at currently at STP. What volume will the
gas have at 100°C and 5.0 atm?
A famous Italian chef wants to open a restaurant in
one of the cities (Mumbai, Denver, Mexico City).
The optimum temperature for cooking pasta is
212°F (100°C). Which city would be the best place
to open the restaurant?
a. Mumbai
b. Denver
c. Mexico City
Mumbai is the best as it has the largest population and the closest temp to that of cooking pasta
Opening a restaurantMumbai an city in India with an average temperature of 33C and a population of about 21,296,516
Denver a city in Colorado in the USA with a temperature of 5C and a population of 705,576 (2019)
Mexico City a city in Mexico with a temperature of 12C and a population of 9 Million persons
Therefore, Mumbai is the best as it has the largest population and the closest temperature to that of cooking pasta
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