Answer:
the change in internal energy of the gases is -3.0924 KJ
Explanation:
The computation of the change in internal energy of the gases is as follows;
Given that
Q = -3.1 KJ
= -3100 J
It is negative as the heat is lost from the mixture
And,
W = + 7.6 J
It is positive as the work is done in the mixture
Now we use the following equation
Delat E = Q + W
= -3100 J + 7.6 J
= -3092.4 J
= -3.0924 KJ
Hence, the change in internal energy of the gases is -3.0924 KJ
How many moles of aluminum are equivalent to 4.816 × 1024 atoms?
A.12.5
B.8
C.1.25
D.08
Answer:
6.591
Explanation:
= 6.951 moles
Answer: 8
Explanation:
A 10 gram sample of iron reacts with oxygen to form 18.2 grams of ferric oxide. How many grams of oxygen reacted?
Answer:
[tex]\boxed {\boxed {\sf 8.2 \ grams}}[/tex]
Explanation:
According to the Law of Conservation of Mass, the mass of the products must equal the mass of the reactants.
mass products = mass reactantsIn this problem, the reaction is:
[tex]iron + oxygen = ferric \ oxygen[/tex]
The reactants are iron and oxygen. We know the mass of the iron sample is 10 grams. The product is ferric oxide. The mass of the ferric oxide sample is 18.2 grams.[tex]10 \ g + oxygen=18.2 \ g[/tex]
We want to find how many grams of oxygen reacted. We have to get the oxygen by itself. 10 is being added to oxygen. The inverse of addition is subtraction. Subtract 10 from both sides of the equation.
[tex]10 \ g - 10 \ g+ oxygen = 18.2 \ g - 10 \ g[/tex]
[tex]oxygen= 18.2 \ g - 10 \ g[/tex]
[tex]oxygen= 8.2 \ g \\[/tex]
8.2 grams of oxygen reacted with 10 grams of iron to form 18.2 grams of ferric oxide.
using the ideal gas law, PV=nRT, where R=0.0821 L atm/mol K, calculate the volume in liters of oxygen produced by the catalytic decomposition of 25.5 g potassium chlorate according to the following reaction. The oxygen is collected at 2.22 atm and 25.44 C. express your answer to the correct number of significant figures.
2KClO3(s) ---> 2KCl(s) + 3O2(g)
Answer:
V = 2.32 Liters
Explanation:
PV = nRT => V = nRT/P
n = 25.8g/122g/mole = 0.21 mole
R = 0.08206 L·atm/mol·K
T = 25.44°C + 273 = 298.44K
P = 2.22 atm (given in problem)
V = (0.21mol)(0.08206 L·atm/mol·K)(298.44K)/(2.22atm) = 2.32 Liters at 25.44°C & 2.22atm
is francium found in nature or lab?
Answer:
It was the last element first discovered in nature, rather than by synthesis. Outside the laboratory, francium is extremely rare, with trace amounts found in uranium and thorium ores, where the isotope francium-223 continually forms and decays
Use Figure 5-5 to determine the types of radiation described in problem 5
Answer:6.12 x 10¹⁴ s⁻¹
Objects get their colors from reflecting only certain wavelengths when hit with white light. Light reflected from a green leaf is found to have a wavelength of 4.90 x 10⁻⁷ m. What is the frequency of the light?
Explanation:
Answer: 6.12 x 10¹⁴ s⁻¹
Explanation:
Help plz:))) I’ll mark u brainliest ASAP 10 points
8. What energy transformations take place in a simple electric motor?
D. light --> electrical
B. kinetic --> electric
A. chemical => solar
C. electrical -> kinetic
Answer:
I don't know
Explanation:
just wanna talk because I am getting bored.
Answer:
B)
takes mechanical energy and makes it electrical
Explanation:
what is the empirical formula of vitamin A ( C=83.85, H=10.56, O=5.58)
The empirical formula of vitamin A : C₂₀H₃₀O
Further explanationThe empirical formula is the smallest comparison of atoms of compound =mole ratio of the components
The principle of determining empirical formula
Determine the mass ratio of the constituent elements of the compound. Determine the mole ratio by dividing the percentage by the atomic massmol ratio of C : H : O ⇒
[tex]\tt \dfrac{83.85}{12}\div \dfrac{10.56}{1}\div \dfrac{5.58}{16}\\\\6.9875\div 10.56\div 0.34875\rightarrow divide~by~smallest(0.34875)\\\\20\div 30\div 1[/tex]
How much more pressure does a 250 lb person exert on the ground than a 120 lb person if they are both standing on one foot with area 16 in2?
Answer:
57.124.18 Pascals
Explanation:
The pressure that each person exerts on the ground is given by:
Pressure = force/area
The force that each person exert is given by:
Force = mass (kg) x acceleration due to gravity (10 m/s2)
1 lb = 0.4536 kg, hence;
250 lb person = 113.398 kg
120 lb person = 54.431 kg
Force exerted by the 250 lb person = 113.398 x 10 = 1133.98 kg/m2
Force exerted by 120 lb person = 54.431 x 10 = 544.31 kg/m2
16 inch2 = 0.0103226 m2
Pressure exterted by 250 lb person = 1133.98/0.0103226
= 109,854.11 pascals
Pressure exerted by 120 lb person = 544.31/0.0103226
= 52,729.93 Pascals
Difference in pressure = 109,854.11 - 52,729.93
= 57,124.18 Pascals
Hence, a 250 lb person will exert 57.124.18 Pascals pressure more than a person of 120 lb on a foot with a 16 inch2 area.
Find the element:
1. A group 12 metal that was once used in thermometers, but now it’s know to be poisonous.
2. Has 3 valence electrons and 4 energy levels.
4. The only metalloid with 3 valence electrons.
5. It’s most common isotope has 5 neutrons.
Answer:
.
Explanation:
mercurygalliumboronberylliumIn which unit is the wavelength of an electromagnetic wave commonly measured?
A. J
B. nm
C. s-1
D. kg
Answer:
nm
Explanation:
trust me:)
How can the image be described? Check all that apply.
smaller than the object
real
right-side up
larger than the object
upside down
virtual
Answer:
Smaller than the object
Real
Upside down
Explanation:
The image formed by a convex lens will always be real and smaller. The image formed is smaller than the object, real ,upside down and right side up. Hence, options 1,2,3 and 5 are correct.
What is convex lens?Convex lens is a type of lens, in which one at least one side is curved outside. These lenses have the ability to focus an outside light beam to a spot on the opposite side by converging it.
The focal length of the convex lens is the distance from the lens's center to this point, which is known as the focus. On the other hand, a plano-convex lens has one surface that is flat and the other that is convex.
Convex lenses cause light from an item to bend, creating an upright, smaller, and inverted picture of the original object. As a result, the candle in this instance will be smaller, upside down, and actual.
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Which balance equation represents a single replacement reaction
Answer: A single replacement reaction looks sort of like this
A + BC —> AC + B
Explanation: It would be a LOT more helpful for us if you had provided the answer choices for this question, but I'll try to help by explaining WHAT single-replacement reactions are.
Single-replacement reactions are reactions in which one ion displaces another to form a new compound . One reactant is an element; one reactant is a compound . One product is an element; one product is a compound . The reactant element is part of the compound product .
I hope this helped!
A fruit juice has a very sour taste. What does this most likely indicate?
A. The juice is a metal
B. The juice is a salt
C. The juice is an acid
D. The juice is a base
Explanation:
its hard its either B or C i dont wanna be wrong;-;
Answer:
The Juice wouldnt be a metal, Salt isnt that effective in juice if you have sensitive tastebuds. Your answer is C. THe Juice is an acid
Explanation:
What reaction shows a compound breaking apart into separate substances?
A. A single-replacement reaction
B. A synthesis reaction
C. A double-replacement reaction
D. A decomposition reaction
Answer: The answer is decomposition reaction
Explanation: Hope this helps:)
Answer: D. decomposition reaction
Explanation:
In the reaction of aluminum with iron III oxide, if you start with 54.2 grams of aluminum, how many grams of iron III oxide are needed for the reaction to occur?
Answer:
[tex]m_{Fe_2O_3}=160.41gFe_2O_3[/tex]
Explanation:
Hello!
In this case, since the reaction between aluminum and iron (III) oxide is:
[tex]2Al+Fe_2O_3\rightarrow Al_2O_3+2Fe[/tex]
In such way, since there is 2:1 mole ratio between aluminum (atomic mass = 26.98 g/mol) and iron (III) oxide (molar mass = 159.70 g/mol), we'll be able to compute the mass of the required reactant as shown below:
[tex]m_{Fe_2O_3}=54.2gAl*\frac{1molAl}{26.98gAl}* \frac{1molFe_2O_3}{2molAl}*\frac{159.70gFe_2O_3}{1molFe_2O_3}\\\\m_{Fe_2O_3}=160.41gFe_2O_3[/tex]
Best regards!
Which of the following physical properties is NOT characteristic of a metal?
A.Malleable
B.Solid at room temperature
C.Dull in color
D.Good conductors
The cell membrane around a cell forms a barrier that protects and regulates the cell. Certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane.
Which best describes those that can pass through?
They are concentrated.
They are soluble.
They are diluted.
They are heated.
Answer:
it is b (they are soluble)
Explanation:
got it right on edg and on quizlet
Answer:
B. They are soluble
Explanation:
What effect does the transfer of electrons have on the nuclei of the atoms involved?
Answer:
Chemical processes have no effect on the nucleus otherwise we would be in deep truble. GOOD LESSONS ♡
what does the changing the Aperture do when taking a photo? *
4.What effect can you get from using a slow shutter speed? *
5.What effect can you create by using a quick shutter speed
Answer:
Slower shutter speeds like 1/60 second and slower cause a blurring effect. If you want to take a picture using a slow shutter speed, it is best to mount the camera on a tripod and use image stabilization (such as SteadyShot® technology) to reduce the chance of any unwanted camera movement.
The first big effect of it is motion blur. If your shutter speed is long, moving subjects in your photo will appear blurred along the direction of motion. ... If you use an especially fast shutter speed, you can eliminate motion even from fast-moving objects, like birds in flight, or cars driving past.
Explanation:
The noble-gas notation for the element indium, (In, atomic #49) is:
A.
?
[Kr]5p?
B.
?
[KrJ5524d105p
C.
?
[Kr]5s25d 105p1
D. ?
[Kr]5524f1450 105p1
Answer:[tex][Kr]4d^{10}5s^25p^1[/tex]
Explanation:
The element Indium with atomic number 49 will have 49 protons and 49 electrons in it.
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom. The electrons are filled according to Afbau's rule in order of increasing energies and the nearest noble gas is Krypton with 36 electrons.
The electronic configuration in terms of noble gas configuration is:
[tex]In:49:[Kr]4d^{10}5s^25p^1[/tex]
The noble-gas notation for the element indium is [Kr} 4d¹⁰5s²5p¹. The correct option is B. [Kr] 5s2 4d10 5p1
From the question,
We are to write the electron configuration of the element Indium, using the appropriate noble gas notation.
The noble gas that comes before Indium (In) is Krypton (Kr). Therefore, the noble gas that will be used in the notation is Krypton.
Indium has an atomic number of 49 while Krypton has an atomic number of 36. This means we will fill in 13 more electrons.
The electron configuration for the element indium using the noble-gas notation is
[Kr} 4d¹⁰5s²5p¹
Hence, the noble-gas notation for the element indium is [Kr} 4d¹⁰5s²5p¹. The correct option is B. [Kr] 5s2 4d10 5p1
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A solution contains 9.25x103 M copper(II) nitrate and 1.40x102 M manganese(II) acetate. Solid potassium carbonate is added slowly to this mixture.
A. What is the formula of the substance that precipitates first?
B. What is the concentration of carbonate ion when this precipitation first begins?
Answer:
Explanation:
Concentration of Cu⁺² = 9.25 x 10³ M
Concentration of Mn⁺² = 1.4 x 10² M
solubility product of copper carbonate = 7.08 x 10⁻⁹
solubility product of manganese carbonate = 2.24 x 10⁻¹¹
solubility product of later is less so carbonate of manganese will come out first .
B )
[ Mn⁺² ] [ CO₃⁻² ] = 2.24 x 10⁻¹¹
1.4 x 10² [ CO₃⁻² ] = 2.24 x 10⁻¹¹
[ CO₃⁻² ] = 1.6 x 10⁻¹³ .
the concentration of carbonate ion when this precipitation first begins
= 1.6 x 10⁻¹³ M .
Can a trout and a catfish be members of the same population?
Answer:
Most likely. They eat different prey items so they would use niche partitioning. for example the leopards and lions of africa. They are both large carnivores, but are able to coexist by evolving to prey on different animals.
Explanation:
Why is cellular respiration important?
A or B?
A. It changes energy in glucose into energy that can be used.
B. It changes radiant energy into chemical energy for all living things.
. Consider the following half-reactions:
Ag+(aq) + e– → Ag(s) E = +0.80 V
Cu2+(aq) + 2 e– → Cu(s) E = +0.34 V
Pb2+(aq) + 2 e– → Pb(s) E = –0.13 V
Fe2+(aq) + 2 e– → Fe(s) E = –0.44 V
Al3+(aq) + 3 e– → Al(s) E = –1.66 V
Which of the above metals or metal ions will reduce Pb2+(aq)?
a. Ag+(aq) and Cu2+(aq)
b. Ag(s) and Cu(s)
c. Fe2+(aq) and Al3+(aq)
d. Fe(s) and Al(s)
e. Cu2+(aq) and Fe2+(aq)
d. Fe(s) and Al(s)
Further explanationIn the redox reaction, it is also known
Reducing agents are substances that experience oxidation
Oxidizing agents are substances that experience reduction
The metal activity series is expressed in voltaic series
Li-K-Ba-Ca-Na-Mg-Al-Mn- (H2O) -Zn-Cr-Fe-Cd-Co-Ni-Sn-Pb- (H) -Cu-Hg-Ag-Pt-Au
The more to the left, the metal is more reactive (easily release electrons) and the stronger reducing agent
The more to the right, the metal is less reactive (harder to release electrons) and the stronger oxidizing agent
So that the metal located on the left can push the metal on the right in the redox reaction
The electrodes which are easier to reduce than hydrogen (H), have E cells = +
The electrodes which are easier to oxidize than hydrogen have a sign E cell = -
So the above metals or metal ions will reduce Pb²⁺ (aq) will be located to the left of the Pb in the voltaic series or which have a more negative E cell value (greater reduction power)
The metal : d. Fe(s) and Al(s)
A scientist claimed that he radiocarbon dated a fossilized skull of a dinosaur and found it to be about 63 million years old. Do you support his claim? Provide at least one scientifically based reason why you do or do not support the claim.
Answer:Since dinosaurs are thought to be over 65 million years old, the news is stunning - and more than some could tolerate. After the AOGS-AGU conference in Singapore, the abstract was removed from the conference website by two chairmen because they could not accept the findings. Unwilling to challenge the data openly, they erased the report from public view without a word to the authors. When the authors inquired, they received this letter:
Explanation:
i do not own my copyrights
What mass of sodium hydroxide will neutralize completely 3.612 moles of HCl?
Answer:
NaOH + HCl = NaCl + H2O
(3.612 moles of HCl) x (1/1) x (39.9971 g/mol) = 144.5 grams
So answer B.
Explanation:
NaOH + HCl = NaCl + H2O
(3.612 moles of HCl) x (1/1) x (39.9971 g/mol) = 144.5 grams
To solve such this we must know the concept of double displacement reaction. Therefore, 144.48g sodium hydroxide will neutralize completely 3.612 moles of HCl.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.
The balanced reaction is
NaOH + HCl = NaCl + H2O
To neutralize completely 3.612 moles of HCl, 3.612 moles of NaOH is required.
mass of NaOH =Mole× Molar mass of NaOH
mass of NaOH=3.612× 40 g/mol
mass of NaOH=144.48g
Therefore, 144.48g sodium hydroxide will neutralize completely 3.612 moles of HCl.
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For the presentation you will research and provide summaries for manned and unmanned explorations of your choice. The presentation should be about twelve slides in length. Your presentation will include:
Title
Introduction – gives an overview of the presentation
Time line of missions – must include 3 manned and 3 unmanned missions
Description of each of the missions in the timeline (1 mission per slide)
Name and date of mission
Purpose of missions
Results or findings from missions
Scientific advance – describe a scientific advancement that has led to an engineering improvement in space exploration
Engineering advance – describe an engineering advance that has led to greater knowledge about the solar system
Sources – list the websites and other sources you used
Remember to make a list (i.e., bullet points) on each slide. The slides should feature the highlights of the main idea. The bullet points should be short phrases (at most, one sentence) that highlight key points.
Answer:
Thank u ?
Explanation:
i don't get your question can you rephrase it pls
Answer:
Look this up on g00gle it will give it right to you! :)
Explanation:
How many H atoms in Mg(OH)2
Answer:
Explanation:
There are 2.
After food is consumed, chemical nutrients are absorbed into the blood. The blood then carries these nutrients to the body's cells where the nutrients enter mitochondria. Which reaction must occur next for the cell to carry on other activities?\
Answer:c. oxygen,light,and glucose combine to produce high energy molecules
Explanation:
