Answer:
green n yellow and white and black and white sq
The vapour pressure of water 12.3kPa at 300K. Calculate the vapour pressure of 1 molal solution of a non-volatile solute in it.
Answer:
ywhehehehehdgdudcdudcd uy dshdcvv
Explanation:
bdbdkzkzjzdkdkzdvdisisksjskakskskzbx vxydcdudschahahbshshs
Calculate the energy required to produce 6.0 moles of Cl2O7 using the following reaction 2 Cl2 + 7 O2 + 130kcal -> 2 Cl207
Answer:
455 Kcal
Explanation:
2Cl2(g) + 7O2(g) + 130kcal → 2Cl2O7(g)
Rearranging we get,
2Cl2(g) + 7O2(g) → 2Cl2O7(g) Δ H = 130 kcal . mol⁻¹
So for per mol reaction will be as above.
In case of 7 mols of product, we need 7/2 mole ratio x 130 = 455 Kcal
A company is announcing the construction of a new skyscraper to the public. Which model will give the best idea of how the new building will change the city skyline?
A.
a drawing showing the interior of the building
B.
a full scale, three-dimensional model of the building
C.
a rough sketch of the building's shape
D.
a drawing showing both the new and old buildings
Answer:
D.
Explanation:
This is because this option would allow one to see the sorroundings of the new building. The others only give perpectives on what the new building looks like, isolated from its sorroundings.
Determine the specific heat of a metal that has a mass of 34.57 g that absorbs 678 J of heat and is heated from 25.0 °C to 55.0 °C.
Answer: [tex]0.654 \text{ J/g} \cdot ^{\circ}\text{C}}[/tex]
Explanation:
[tex]678=(34.57)(c)(55.0-25.0)\\\\c=\frac{678}{34.57(55.0-25.0)} \approx \boxed{0.654 \text{ J/g} \cdot ^{\circ}\text{C}}}[/tex]
Sodium hydroxide (NaOH) is a strong base that is very corrosive. What is the mass of 2.75 × 10-4 moles of NaOH?
3.24 x 10–3 g NaOH
1.10 x 10–2 g NaOH
6.10 x 10–2 g NaOH
6.50 x 10–2 g NaOH
The mass of 2.75 × [tex]10^{-4}[/tex]moles NaOH will be 1.1 x [tex]10^{-2}[/tex] grams
Mass/mole relationshipRecall that:
Mole = mass/molar mass.
Thus, mass = mole x molar mass.
In this case, the mole is 2.75 × [tex]10^{-4}[/tex] moles and the molar mass of NaOH is 40 g/mol.
Mass = 2.75 × [tex]10^{-4}[/tex]x 40 = 1.1 x [tex]10^{-2}[/tex] grams
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Answer:
Answer is option B or:
1.10 x 10–2 g NaOH
Explanation:
hope this helps! (edge)
If 8. 0 ml of water is added to 2. 0 ml of a 0. 500 m koh solution, the concentration of koh is changed to.
Answer: 0.1 M
Explanation:
Originally, [tex]0.500=\frac{\text{moles of solute}}{0.002}[/tex], so there was 0.001 mol of KOH.
Now, there is 8.0+2.0=10.0 mL of solution, so the new concentration is:
[tex]\frac{0.001}{0.01}=\boxed{0.1 \text{ M}}[/tex]
A solution of the ionic salt caso3 would have a ______ ph.
(acidic, basic, or neutral)
A solution of the ionic salt CaSO₃ would have an acidic pH.
What is pH?
This is referred to power of hydrogen and it measures the degree of acidity or alkalinity of a substance.
CaSO₃ which is referred to as calcium sulfite or calcium salt is formed through the reaction below and has a pH of 6 thereby making it an acidic salt.
SO₂ + CaCO₃ → CaSO₃ + CO₂
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Answer:
Basic
Explanation:
acellus
Please help!!
Which part shown in the diagram is positively Charged
Salt bridge
Solid Cu
Solid Zn
Wire
(I know this is late so hopefully other people find it helpful)
Answer: Solid Cu
Since this is a voltaic cell:
Copper is the cathode, therefore having a positive charge.
Zinc is the anode, therefore having a negative charge.
(Also, I took the exam and it's correct; good luck everyone!)
How do chemical weathering and deposition contribute to the formation of the features shown here?
1-
the
Nalt and Gil-
Cu2+
ad out-
what are the spectator ions in this reaction
Answer:
cu2 is 5he correct answer
How many grams of glucose would be found in 1l of a 22% solution?
40 g glucose
Explanation:
I have to assume that you are asking about a 2% m/v solution ( Note that specifying 2% in isolation has no meaning )
2% m/v glucose solution is : 2 g glucose in 100 mL solution
Which is ( multiply by 10): 2% m/v = 20 g glucose in 1000 mL ( = 1.0 L) solution
And so 2%m/v = 40 g glucose in 2000 mL or 2.0 L solution
Answer: 40 g glucose.
1-3 gas stoichiometry! please help and put in steps in every problem. please help if u can
Answer:
um Im not sure what the heck that is
Which two statements describe how volcanic activity can affect Earth's crust?
A) A volcano are most likely to form near the center of tectonic plates
B) A volcanic mountain becomes smaller each time it erupts
C) A volcano can suddenly get taller every time it erupts
D) Hot magma from inside earth is released at weak points in the crust
Answer:
D
Explanation:
The weak crust of the earth does not hold together as well as strong crust.
Answer:
A and B was right in our test.
Explanation:
A was: A volcano can suddenly get taller every time it erupts
B was: Hot magma from inside Earth is released at weak points in the crust.
The following chemical reaction
2H2O + 3HCl ——> 5H2O + Cl
how many moles of H2O is needed to make 3 moles of HCl?
Answer: 2 moles
Explanation:
We know from the equation that for every 3 moles of HCl consumed, 2 moles of water are consumed (based on the coefficients)
So, the answer is 2 moles.
What is the ph of a solution with a hydroxide (oh) concentration of 2.02e-5?
Answer:
The solution has a pH value of 9.3.
Explanation:
To solve this problem, we can first determine the H+ ion concentration and then use this value to calculate the pH. To find the H+ ion concentration from the OH- ion concentration, we should use Kw, which we know has a value of 1 * 10^(-14).
We can then use the following formula to solve for [H+]:
Kw = [H+][OH-]
10^(-14) = (2.02 * 10^(-5)) * [H+]
[H+] = 4.950495 * 10^(-10)
Now, we can find the pH using the formula pH = -log[H+].
pH = - log[H+]
pH = - log(4.950495 * 10^(-10))
pH = 9.3
Therefore, the correct answer is that the pH of the solution is 9.3. Note that an alternative way to solve the problem is to find the pOH from the OH- ion concentration and use the resulting value to determine the pH that way instead.
Hope this helps!
When comparing voltaic cells to electrolytic cells, oxidation occurs at the.
When comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
What is an electrolytic cell?In an electrolytic cell, the reaction is non-spontaneous so it requires some input of energy for it to function while for a voltaic cell, the reaction is spontaneous.
Oxidation occurs at the anode and reduction occurs at the cathode.
Thus, when comparing voltaic and electrolytic cells oxidation occurs at both the anode and the cathode.
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What happens when a solid is dissolved into a liquid?
O Solid particles float toward the surface layer of liquid particles.
O Solid particles sink down toward the bottom layer of liquid particles.
O Solid particles become evenly dispersed among liquid particles.
O Solid particles become suspended in the middle of liquid particles.
When a solid dissolves in a liquid to form a solution, solid particles become evenly dispersed among liquid particles.
What are solutions?Solutions are formed when a solute particle dissolves in another substance known as a solvent.
Usually, solutions are formed when solids dissolve in liquids.
The solid is the solute while the liquid is the solvent.
When a solid dissolves in a liquid, solid particles become evenly dispersed among liquid particles.
Therefore, solutions are formed when solute particles dissolve in solvents.
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Answer:
c
Explanation:
chem ed 2022
Apply scientific knowledge and understanding to determine how many grams of carbon dioxide are produced from the combustion of 250. g of ethane, C3H8 when O2 is in excess:
C3H8 + 5O2 ---> 3CO2 + 4H2O
Answer:
749 grams CO₂
Explanation:
To find the amount of carbon dioxide produced, you need to (1) convert grams C₃H₈ to moles C₃H₈ (via molar mass from periodic table), then (2) convert moles C₃H₈ to moles CO₂ (via mole-to-mole ratio via reaction coefficients), and then (3) convert moles CO₂ to grams CO₂ (via molar mass from periodic table). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units. The desired unit should be in the numerator. The final answer should have 3 significant figures because the given value (250. grams) has 3 sig figs.
Molar Mass (C₃H₈): 3(12.01 g/mol) + 8(1.008 g/mol)
Molar Mass (C₃H₈): 44.094 g/mol
1 C₃H₈ + 5 O₂ ---> 3 CO₂ + 4 H₂O
Molar Mass (CO₂): 12.01 g/mol + 2(16.00 g/mol)
Molar Mass (CO₂): 44.01 g/mol
250. g C₃H₈ 1 mole C₃H₈ 3 moles CO₂ 44.01 g
------------------ x ---------------------- x ---------------------- x -------------------- =
44.094 g 1 mole C₃H₈ 1 mole CO₂
= 749 grams CO₂
Suppose cobalt-60 undergoes a type of radioactive decay that does not
change the identity of the isotope. which type of decay did the isotope
undergo?
a. delta
b. gamma
c. alpha
d. beta
Gamma decay is a type of radioactive decay that does not change the identity of the isotope.
What is gamma decay?During gamma decay the nucleus emits radiation without actually changing its composition. In this type of decay only energy is released but the structure is same.
So we can conclude that gamma decay is a type of radioactive decay that does not change the identity of the isotope.
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In reaction 1, 12g of reactants were converted to products in 30 seconds. In reaction 2, 200g of reactants were converted to products in 8 minutes. Which reaction happened at the faster rate?
Answer:
Reaction 2
Explanation:
12/30=0.4g/sec
200/(8*60)=0.41667g/sec
how to Use your trend line to estimate the gas pressure of this system at 0°C.
Answer:
The slope of the trend line is 2.55; as the temperture.
Explanation:
Select the correct answer from each drop-down menu. a 126.1-gram block of granite at 92.6°c is dropped into a tub of water at 24.7°c in an isolated system. the final temperature of both the granite and the water is 51.9°c. the specific heat capacity of granite is 0.795 joules/gram degree celsius, and the specific heat capacity of water is 4.186 joules/gram degree celsius. the granite block transferred of energy, and the mass of the water is .
Taking into account the definition of calorimetry, the mass of water is 35.70 grams.
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass m.c is the specific heat substance c. ΔT is the temperature variation.Mass of water in this caseIn this case, you know:
For granite:
Mass of granite= 126.1 gInitial temperature of granite= 92.6 °CFinal temperature of granite= 51.9 ºCSpecific heat of granite = 0.795 [tex]\frac{J}{gC}[/tex]For water:
Mass of water = ?Initial temperature of water= 24.7 ºCFinal temperature of water= 51.9 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:
- Qgranite = + Qwater
- 0.795 [tex]\frac{J}{gC}[/tex] × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)
Solving:
4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C
4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water
mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]
mass of water= 35.70 grams
Finally, the mass of water is 35.70 grams.
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Antoine lavoisier is credited with the discovery of the law of conservation of mass. the law states that in a chemical reaction, matter is not created or destroyed but preserved. which equation correctly models this law?
h2 + cl2 ---> 2hcl
h2 + cl2 ---> hcl
h + cl ---> 2hcl
2h2 + cl2 ---> 2hcl2
The Antoine's law means that the amount of substance before reaction must be equal the amount of substance after reaction
The equation h2 + cl2 ---> 2hcl correctly models this law.
Jupiter revolves around the sun in a predictable pattern because
Guided Practice
Old-fashioned windmills are not aerogenerators because
Answer:
What is the main problem with windmills?
Image result for Guided Practice Old-fashioned windmills are not aerogenerators because
As with all energy supply options, wind energy can have adverse environmental impacts, including the potential to reduce, fragment, or degrade habitat for wildlife, fish, and plants. Furthermore, spinning turbine blades can pose a threat to flying wildlife like birds and bats.
Why are the windmills not moving?
Why do the turbines not spin at times? The most common reason that turbines stop spinning is because the wind is not blowing fast enough. Most wind turbines need a sustained wind speed of 9 MPH or higher to operate. Technicians will also stop turbines to perform routine maintenance or repairs.
All the following ions have the same charge except Group of answer choices oxide. monohydrogen phosphate. peroxide. permanganate. oxalate.
All the given species have the same charge except peroxide.
Charges on ionsThe charge on monohydrogen phosphate is negative because of its formula, [tex][HPO4]^{2-}[/tex].The charge on permanganate is negative. The formula is [tex]MnO^-[/tex]The charge of oxide ([tex]O^{2-}[/tex]) is negative.The charge on peroxide is ( R−O−O−R) is neutral.The charge on oxalate, [tex]C2O4^{2-}[/tex], is negative.Thus, only peroxide is unique.
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How can we tell the distance sediments traveled due to erosion ?
Answer:
more rounded the grains are the more they have been moved around
Explanation:
Generally – the more rounded the grains are the more they have been moved around (i.e. the longer the length of time or distance they have moved). Angular grains cannot have travelled far
geolsoc.org.uk
is 2.71 greater then 8?
Answer:
no
Explanation:To help you know the difference change it into a percentage, by moving the decimal two places to the right. That would give you 271% and 800% would you rather get a 271% or a 800% on a test? You would want to get an 800% because it’s a bigger number.
Diethyl malonate reacts with propyl bromide in a three‑step reaction sequence. Identify the product that is formed. The highlighted carbons should correspond to the carbons from diethyl malonate
The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.
What is a Chemical Reaction ?
Chemical reaction, a process in which one or more substances, the reactants, are converted to one or more different substances, the products.
Substances are either chemical elements or compounds.
A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Chemical reactions are an integral part of technology, of culture, and indeed of life itself.
The product that is formed is shown in the figure , Option A is the correct answer , and the highlighted carbons shown corresponds to the carbons from diethyl malonate.
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Need help with this chemistry question will reward with 50 points just please put the correct answer I'm very confused on it
Answer: 2Na3 (s)-> 2Na (s) +3N2 (g)
Explanation:
look at the keywords then balance equation