Pl help it’s for a grade
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction tums them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The cylinder is also submerged in a large insulated water bath. 1 atm pressure piston cylinder The temperature of the water bath is monitored, and it is determined from this data that 300.1J of heat flows out of the system during the reaction. The position of the piston is also monitored, and it is determined from this data that the system does 316.kJ of work on the piston during the reaction water bath gases exothermic.
Required:
a. Is the reaction exothermic or endothermic?
b. Does the temperature of the water bath go up or down?
Answer:
The reaction is exothermic
The temperature of the water bath goes up
Explanation:
An exothermic reaction is one in which energy flows out of the reaction system.
In this case, the system is the reaction vessel while the surrounding is the water bath. We see in the question that 300.1J of heat flows out of the system during the reaction. This is heat lost to the surroundings showing that the reaction is exothermic.
As energy is lost to the surroundings, the temperature of the water bath rises accordingly.
The density of pentanol, C3H20, is 0.8110 g/mL. Calculate the volume occupied by 7.455 moles of pentanol. What is the volume occupied by 7.455 moles of pentanol?
The volume occupied by 7.455 moles of pentanol is 553.5 mL or 0.5535 L.
What does molar mass of a compound signify?The molar mass of a given compound is the mass of one mole of that compound. It is expressed in unit as grams per mole (g/mol).
To calculate the volume of pentanol occupied by 7.455 moles of the substance, we can use the following formula:
Volume = (number of moles x molar mass) / density
The molar mass of pentanol (C3H8O) can be calculated as:
3 x atomic mass of carbon (12.01 g/mol) = 36.03 g/mol 8 x atomic mass of hydrogen (1.01 g/mol) = 8.08 g/mol 1 x atomic mass of oxygen (16.00 g/mol) = 16.00 g/mol Total molar mass = 60.11 g/mol
Placing the given values into the formula, we get:
Volume = (7.455 mol x 60.11 g/mol) / 0.8110 g/mL Volume = 553.5 mL or 0.5535 L
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Which of the following methods is least likely to help Alisha determine the age of sedimentary rock layers in her backyard?
A. Apply radiometric dating to determine the amount of radioactive isotopes in each rock layer.
B.Identify index fossils in sedimentary rock that have lived in a particular time in Earth’s history.
C. Analyze seismic diagrams to determine how radioactive elements break down into stable elements.
D. Use relative dating techniques to determine how individual fossil groups are related to specific rock layers.
ILL GIVE BRAINLIEST!11
Answer:
i put c
Explanation:
Rocks' ages are determined through radiometric dating, which takes into account the ratio of two different isotopes in a sample. Geologists can use tools like these to assess the age of a material,Mass spectrometer for thermal ionization Thus, option C is correct.
What determine the age of sedimentary rock layers?How rocks are structured in strata and how they fit into the larger geological history are the main topics of stratigraphic study. This approach is best suited for studying sedimentary rocks. Cross dating is a method for using fossils to determine a rock's relative age.
Therefore, Index fossils are sought after by geologists in geological strata. Index fossils are useful because they show the relative dates of the rock layers in which they are discovered. Since radioactive isotopes deteriorate with known time intervals.
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Which two notations represent isotopes of the same element?
1.
N and EN
2.
N and Ne
3
N and Ne
4.
N and Ne
Submit Answer
Answer:
No.2, No.3 and No.4 answers are same. Give the options properly.
one reaction that produces hydrogen gas can be represented by the unbalanced chemical equation Mg(s)+HCI(aq) -> MgCI(aq)+H2(g). What is the mass of HCI is consumed by the reaction of 3.25 mol of magnesium?
128 g HCl
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableStoichiometry
Reaction Mole RatiosUsing Dimensional AnalysisExplanation:Step 1: Define
[RxN - Unbalanced] Mg (s) + HCl (aq) → MgCl (aq) + H₂ (g)
↓
[RxN - Balanced] 2Mg (s) + 2HCl (aq) → 2MgCl (aq) + H₂ (g)
[Given] 3.25 mol Mg
[Solve] x g HCl
Step 2: Identify Conversions
[RxN] 2 mol Mg → 2 mol HCl
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of Cl - 35.45 g/mol
Molar Mass of HCl - 1.01 + 35.45 = 36.46 g/mol
Step 3: Stoich
[S - DA] Set up: [tex]\displaystyle 3.25 \ mol \ Mg(\frac{2 \ mol \ HCl}{2 \ mol \ Mg})(\frac{36.46 \ g \ HCl}{1 \ mol \ HCl})[/tex][S - DA] Multiply/Divide [Cancel out units]: [tex]\displaystyle 127.61 \ g \ HCl[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
127.61 g HCl ≈ 128 g HCl
In humans, normal color perception (N) dominates the expression of color blindness (n), and both of these genes are carried on the X chromosome (XN or Xn). A woman with normal color vision has a color-blind father. Her husband is also color-blind.
a. What is the genotype of the colorblind man? ____
b. What is the genotype of the woman? ______
c. What is the probability of her daughter to be colorblind? __________%
d. What is the probability of her sons to be colorblind? _________%
WHO CAN HELP ME
Answer:
a: Nn or XN
b: Nn or Xn
c: 75%
d: 50%
Explanation:
A fly hits a windshield of a truck. The truck exerts a force on the fly, and
the fly exerts an equal and opposite force back on the windshield.
A. Newton’s first law
B. Newton’s second law
C. Newton’s third law
Answer:
A fly hits a windshield of a truck.
Explanation:
newton's first law
During electrolysis, where do reduction reactions occur?
A. in the anode of an electrolytic cell
B. in the cathode of an electrolytic cell
C. in the power source of an electrolytic cell
D. in the salt bridge of an electrolytic cell
Answer:
B)
Explanation:
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WAITING FOR YOUR RESPONSE
Answer:
( : The correct option is, (a) anode
Explanation:
If plant a, the parent plant, died from a new disease, what might happen to plant B?
which one is the correct ans.
Answer:
Aluminium Sulphate
Explanation:
Aluminium sulphate is the most widely used aluminium coagulant. It is soluble in water and used as a coagulating agent in purification of drinking water and in waste water treatment plants.
Answer:
where are you from .. ...
Name the following alkene compound
What is the formula for Triphosphorous nonaoxide
what is the molarity of ethanol c2h5oh in an aqueous solution that is 36.4% ethanol by mass
Answer:
the answer is A
Explanation:
An allergy medicine is usually stored in a cabinet at room termperature where its molecules move around each other. By
mistake, an intern transferred energy into the medicine. After one hour, the intern found the medicine and noticed that it
was a liquid. How were the molecules moving when the intern found the medicine? Explain why the molecules were
moving this way after the intern transferred energy ito the medicine.
Answer:
hello, can you pleas egive me the answer? i have the same exact question. thank you!
Explanation:
on analysis an ammonium salt of an alkanoic acid gave 60.5% C and 6.5% H if 0.309g of the salt yield 0.0313g of Nitrogen determine the empirical formula of the salt [ H = 1, C =12, N = 14, O= 16]
Answer: C7H9NO2
Explanation:
%N = 0.0313/0.309 x 100
= 10.1%
%0 = 100 — (60.5 + 6.5 + 10.1)
= 22.9
C; 60.5/12 H; 6.5/1 N; 10.1/14 O; 22.9/16
C; 5.04/0.72 H; 6.5/0.72 N; 0.72/0.72 O; 1.43/0.72
Empirical formula — C7H9NO2
need help answering this, Aleks is very picky, and I have been struggling with these questions
Answer:
No
No
Yes 25cm
Explanation:
1) mass can't be divided by distance.
2) the measurements are completely different but under the same category of distance. you can only divide it if meters was cm and squared
3) measurements the same and you can multiply it
What is the difference between Claire’s test of the collision scene where Vehicle 2 fell off the cliff and the film, Iceworld Revenge, where it did not?*
Which claim is more convincing?
Claim 1: The vehicles in Iceworld Revenge had different masses; in Claire’s test, the vehicles had the same mass.
Claim 2: The friction of the surface that was used in Iceworld Revenge was different from the friction of the surface in Claire’s test.
Did the Science Seminar cause your thinking about the claims to change? Explain.
Complete Question:
Check the file attached to get the complete question
Answer:
In the film Ice word Revenge, vehicle 2 did not fall of the cliff because, but in Claire's test, vehicle 2 off the cliff because
Explanation:
In Claire's test, the weight of vehicle 1 is either equal to or greater than the weight of vehicle 2, so it was sufficient to push it down the cliff. In the film Ice word revenge, the weight of vehicle 1 is less than the weight of vehicle 2, it is not sufficient to make it fall off the cliff ( Note: Looking exactly the same in the movie, as Claire claimed, does not mean they have the same mass). Therefore if Claire wants a collision that will not make the vehicle 2 fall off the cliff, he should collide it with a vehicle of lesser mass/weight.
15 g NiO is dissolved into enough water to make 800. mL of solution. What is the molar concentration of the solution? Report your answer with the correct number of significant figures.
Answer: 0.25
Explanation: M = moles of solute / volume of solution (L)
First, you need to calculate the number of moles using the given mass and the molar mass.
15 g74.692 g/mol≈0.20 mol
Then, you can solve for molarity using the molarity equation. The answer should be reported to two significant figures.
M=0.20 mol/ 0.800 L = 0.25 M
The molar concentration of NiO solution is 0.251 M.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.Considering the given example, molar concentration of NiO is found out as follows,
molar concentration=15/74.69 ×1/0.8= 0.251 M.
where 74.69 is molar mass of NiO.
Thus, the molar concentration of NiO is 0.251 M.
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Where does an air mass gets its characteristics? A. From the air close to the sun and then it moves down to earth
B. From where it forms over the Earth and then it rises
C. From the air in the stratosphere
Answer:
C. From the air in the stratosphere
Explanation:
I hope it will help
Describe the patterns and atomic mass is an ion charges in the periodic table
Answer:
The atomic number increases across a period and down the group or family. The atomic mass generally increases with atomic number with a few exceptions.
• as it sits on top of a building that is 50 meters tall.
• as it is half-way through a fall off a building that is 50 meters tall and travelling 19.8 meters per second.
• as it is just about to hit the ground from a fall off a building that is 50 meters tall and travelling 28 m/s
What is the potential energy of the ball as it is half-way through the fall (25 meters high)?
help me plss it’s kinda easy but i’m not sure
Answer:
Sexual Reproduction
Explanation:
In Asexual Reproduction offsprings are know as ramets and many ramets are known as clowns. So, when two parents are involved genetic variations occur in offspring. Pollen possess male gamete (antherozoid/sperm) and ovule possess egg.
A part
If potassium reacts so dangerously with water, and people are mostly made of water, why can we eat bananas without blowing up?
Answer:
A banana, like most other lifeforms, is about 70% water, and all the potassium it contains already exists in the form of K+ ions dissolved in water. Which is why bananas do not explode in water, or spontaneously combust.
What is the atomic weight of Mercury?
Answer:
Not sure if I'm correct, but I think it's 200.59 u
Answer:
The answer is 200.59 u
Explanation:
Mercury has a mass of 3.3 x 1023kilograms. This mass is contained in a volume of 14.6 billion cubic miles (60.8 billion cubic km). The mass and volume of Mercury is only about 0.055 times that of Earth
For case 1, what happens when an electron jumps from energy level 1 to energy level 3 in an atom?
Answer:
Case 1 (energy level): In an atom, an electron jumps from energy level 1 to energy level 3. ... The energy will increase.
Explanation:
Do you agree / disagree - Light is always the same, even when it is emitted by different light sources (like the sun and a light bulb).
Answer:
She's right that there's a difference, and you are right that it's all just electromagnetic waves!
The key to this is that there is no such thing as "white light" when you really get down to it. Each light emits a range of wavelengths of light. If they have a sufficiently even distribution of wavelengths, we tend to call that light "white," but we can only use that term informally.
Both the sun and the light bulb emit so-called "Blackbody radiation." This is the particular spectrum of light that's associated with the random thermal emissions of a hot object. Cool objects tend to emit more of their energy in the longer wavelengths like reds and IRs, while hotter objects emit more energy in the shorter wavelengths like blues and UV.
Blackbody graphic
(Note, there are other possible emission spectra, but those are associated with different materials doing the emissions and, for the purposes of this discussion, they aren't too important. We can just claim the emissions are all blackbody)
If you notice, as you get hotter, a larger portion of the energy is emitted in the blue, violet, and ultraviolet. That's how you get a sunburn from the sun. It's harder to get a sunburn from an artificial light, not because it's artificial, but because those lights are almost always cooler than the sun. They don't have as much UV content. Instead, they have more red and yellow, which incidentally is why pictures taken indoors look very yellow. If you use a strobe, however, all those yellow hues go away because a strobe light is very warm, with lots of blues.
You can get a sunburn from artificial light, of course. Tanning beds are the obvious example, but there are other interesting ones. When you're a jeweler working in platinum, for instance, you need to wear UV protective gear (like glasses or even sunscreen). Platinum's melting point is so hot that it actually emits quite a lot of UV light and can give you a sunburn!
Other than these spectra, there is nothing different between light from an artificial source and light from the sun. Photons are photons.
Explanation:
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Decide whether a chemical reaction happens in either of the following situations. If a reaction does happen, write the chemical equation for it. Be sure your chemical equation is balanced and has physical state symbols. situation chemical reaction.
A strip of solid magnesium metal is put into a beaker of 0.042M SnCl3 solution.
Answer: [tex]3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)[/tex]
Explanation:
Single replacement reaction is a chemical reaction in which more reactive element displaces the less reactive element from its salt solution.
A more reactive element is one which can easily lose or gain electrons as compared to the other element.
As Magnesium is more reactive than tin, it can easily displace tin from its salt solution [tex](SnCl_3)[/tex] and form magnesium chloride and tin in elemental form.
The balanced chemical equation is:
[tex]3Mg(s)+2SnCl_3(aq)\rightarrow 3MgCl_2(aq)+2Sn(s)[/tex]
The three temperate marine climates are?
Marine west coast, humid subtropical, and Mediterranean.
If someone is building a scale model of our solar system which characteristic would be the most difficult to build into the model?
1#The relative sizes of the objects
2#The colors of the objects
3#The distances between objects
4#The composition of the objects
Answer:
The composition of the objects because not all the planets have been explored