Answer:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Explanation:
Exothermic reaction is a reaction in which heat is released to surrounding. This is due to the fact that the heat content of the reactant is higher than the heat content of product thus producing a negative enthalpy change (ΔH) i.e
Enthalpy change = Heat of product – Heat of reactant
ΔH = Hp – Hr = negative
Considering the options given in the question above, the correct answer is:
Negative, because the potential energy of the reactants is higher than the potential energy of the products
Workers who build railway tracks often use a process called thermite welding to connect pieces of track. Thermite is a mixture of aluminum metal (Al) and ferric oxide (Fe2O3). A worker places thermite between two pieces of track and then burns it to form aluminum oxide (Al2O3) and iron (Fe). As the reaction happens, the air around the mixture becomes so hot that the two pieces of track fuse together.
Is this chemical exothermic or endothermic?
Explanation:
guess
exothermic because of the heat
HELP !
The provided balanced equation applies to the reaction that takes place between lithium hydroxide and sulfuric acid. 2LiOH + H2SO4 -> Li2SO4 + 2H2O .
If the reaction begins with 26.7 grams of lithium hydroxide (LIOH) and 164.08 grams of suite acid (H2SO4.), how many grams of lithium sulfate (Li2SO4,) is produced? Assume 100% yield . Round your answer to the nearest tenth of a gram .
Answer:
60g or 61.28g
Explanation:
Trust me on this I had the same problem as you
What is chemistry the study of?
Unilt lest
Unit Test Active
TIME REMAINING
01:22:52
Which shower would most likely be the control group in this
study?
Mildew is a fungus that grows in wet areas and can slowly
grow from microscopic to large stains in showers and sinks
Researchers are studying different sprays that could be used
to slow down the growth of mildew. They set up different
showers that are exactly the same and expose them each to
water with the same microscopic amount of mildew. They
then spray some showers with mildew-preventing sprays and
observe how fast mildew grows over time.
O the shower sprayed with many test sprays
the shower not exposed to any mildew at all
O the shower not sprayed with any mildew-preventing spray
O the shower sprayed with a test spray that is already
known to work
Answer:
Option C, the shower not sprayed with any mildew-preventing spray is most likely be the control group in this study
Explanation:
Complete question
Mildew is a fungus that grows in wet areas and can slowly grow from microscopic to large stains in showers and sinks. Researchers are studying different sprays that could be used to slow down the growth of mildew. They set up different showers that are exactly the same and expose them each to water with the same microscopic amount of mildew. They then spray some of the showers with mildew-preventing sprays and observe how fast mildew grows over time. Which show would most likely be the control group in this study? A- the shower sprayed with many test sprays B- the shower not exposed to any mildew at all C- the shower not sprayed with any mildew-preventing spray D- the shower sprayed with a test spray that is already known to work
Solution
In any experiment, a control group is a group of participants that is not exposed to any treatment so that it can be compared with the experimental group on which the treatment is applied/given.
In this case - experimental group are the stained showers that are subjected to the different types of mildew test sprays while the control group is the the shower not sprayed with any mildew-preventing spray.
Hence, option C is the correct answer
When scientist need to work on Sharks and some other fish in water they flip them upside down on their backs because
Answer:
In simple words, Sharks have the ability to enter a trance state. Whenever a shark is flipped upside around it enters a trance-like experience known as tonic immobilization.
That's why, when certain researchers are operating on saw fish with in ocean, they often turn them over. Otherwise, there is a chance that the fish might start panicking and the work of scientist will get tougher.
What is the % dissociation of a solution of acetic acid if at equilibrium the solution has a pH = 4.74 and a pKa = 4.74?
Answer:
[tex]\% diss = 50\%[/tex]
Explanation:
Hello there!
In this case, when considering weak acids which have an associated percent dissociation, we first need to set up the ionization reaction and the equilibrium expression:
[tex]HA\rightleftharpoons H^++A^-\\\\Ka=\frac{[H^+][A^-]}{[HA]}[/tex]
Now, by introducing x as the reaction extent which also represents the concentration of both H+ and A-, we have:
[tex]Ka=\frac{x^2}{[HA]_0-x} =10^{-4.74}=1.82x10^{-5}[/tex]
Thus, it is possible to find x given the pH as shown below:
[tex]x=10^{-pH}=10^{-4.74}=1.82x10^{-5}M[/tex]
So that we can calculate the initial concentration of the acid:
[tex]\frac{(1.82x10^{-5})^2}{[HA]_0-1.82x10^{-5}} =1.82x10^{-5}\\\\\frac{1.82x10^{-5}}{[HA]_0-1.82x10^{-5}} =1\\\\[/tex]
[tex][HA]_0=3.64x10^{-5}M[/tex]
Therefore, the percent dissociation turns out to be:
[tex]\% diss=\frac{x}{[HA]_0}*100\% \\\\\% diss=\frac{1.82x10^{-5}M}{3.64x10^{-5}M}*100\% \\\\\% diss = 50\%[/tex]
Best regards!
Complete the sentence. _______ have the information to build proteins.
Select one:
Segments of nucleotides called genes
Segments of DNA called RNA
Segments of DNA called genes
Segments of nucleotides called RNA
Answer:
Segments of DNA called RNA.Good luck dude
Ideal gas law:
If 6.3 moles of a gas in a 20 L cylinder have a pressure of 5.5 atm, what is the temperature?
Answer:
212. 9 degree celcius
Explanation:
From PV =nRT
T= PV/nR
T= (5. 5x20)/(6. 3x0. 082)
T= 110/0. 5166
T= 212. 9 degree celcius
what is glue made up of
Answer:
Glue is made up of - combination of polyvinyl acetate (PVA), water, ethanol, acetone and other substances. The animal remains that are the raw materials for glue may include ears, tails, scraps of hide or skin, scrapings from the fleshy sides of hides, tendons, bones and collagen taken from animal parts, particularly horse hooves and bones.
Explanation:
Oof hope this helps =)
Answer:
Synthetic glues and adhesives are made from polyvinyl acetate, water, ethanol, acetone and some other substances. The water is used to modify the glue's consistency while the other substances are used to control the drying rate of the glue.
WILL MARK BRAINLIEST!!! Think about how to determine the molar mass of NH4OH,
In that amount of ammonium hydroxide, how many moles
would you have? In other words, the molar mass of any
compound is equal to
2 moles
1 mole
4 moles
0,5 moles
To produce one or more other organisms.
1.Life cycle
2.Inherited Trait
3.Reproduce
4.Offspring
Answer:
The answer is offspring
Explanation:
when silver is mixed with aluminum nitrate the products are silver nitrate and aluminum metal. how many molocules of silver nitrate are produced if we have 216 grams of aluminum nitrate?
STOICHIOMETRY
Answer:Aluminum metal in silver nitrate ….
You might be expecting silver metal, Ag, and aluminum nitrate, Al(NO3)3, as products. But instead all you will end up with is wet aluminum. The passivating layer of Al2O3 will prevent aluminum from reducing silver ions.
Explanation: Al(s) + AgNO3(aq) → No reaction
The two things we might do to the mixture to disrupt the Al2O3 surface will cause the Ag+ ions to react. Often a source of chloride ion is used because AlCl4^- will form, exposing the aluminum surface. But that will cause AgCl(s) to precipitate. You can also make the solution basic with NaOH and form Al(OH)4^-, but that will cause Ag2O(s) to form. (You will get Ag2O instead of AgOH.)
Concentrated acids will oxidize any aluminum metal that might be exposed if you were to add concentrated HNO3. That would simply enhance the
Which person do you agree with the most?
A Casey: The human population had been fairly constant throughout
Earth's history.
Allayna: Population size is increasing at a significant rate due to
advances in technology, medicine, and sanitation.
© Karl: Population size has been decreasing over time because people
are having fewer children.
A compound is composed of 53.33%carbon, 11.11%hydrogen and 35.56%oxygen. If the molecular mass of the compound is 90, what is the molecular formula of this compound?
8. The kinetic energy between the particle is maximum in which state
Answer:
Particles has the highest kinetic energy when they are in the gaseous state. Kinetic energy is related to heat (also called thermal energy
and heat.
4 Which increases the kinetic energy of the
particles that make up a bowl of soup?
A. dividing the soup in half
B. putting the soup in a refrigerator
C. heating the soup
for 1 min on a stove
D. decreasing the distance between the
particles that make up the soup
a 0.1 kg slinky sits at the top of a staircase with 14 J of potential energy. How high is the staircase?
Answer: The staircase is 14.28 m high.
Explanation:
Given : Mass = 0.1 kg
Potential energy = 14 J
Potential energy is the energy occupied by the position of a substance. Therefore, formula for potential energy is as follows.
P.E = mgh
where,
m = mass
g = gravitational energy = [tex]9.8 m/s^{2}[/tex]
h = height of object
Substitute the values into above formula as follows.
[tex]P.E = m \times g \times h\\14 J = 0.1 kg \times 9.8 m/s^{2} \times h\\h = \frac{14 J}{0.1 kg \times 9.8 m/s^{2}}\\= \frac{14 J}{0.98 m kg/s^{2}}\\= 14.28 Js^{2}/ mkg (1 J s^{2}/m kg = 1 m)\\= 14.28 m[/tex]
Thus, we can conclude that the staircase is 14.28 m high.
Which of the following is the name of a process in which
electrical energy causes a chemical reaction?
o hydrolysis
o electrolysis
O oxidation
o electronation
Answer:
Explanation:
The answer is electrolysis
Increase the mass of the red ball. What happens to the force on the blue ball? What happens to the force on
the red ball
Answer:
i really dont know because i dont have anything to look at to know that answer.
In a separate location, take notes from the sources you have identified. The notes will provide details for your presentation. While taking notes from texts and websites, use these reading strategies. In the space provided, write four pieces of information that you intend to use in you presentation
Answer:
you didn't specify what the presentation was about. However, I can help you by showing you how to do this activity.
When making notes of the sources, you must show when these sources were built and what is their direct relationship with your research, in addition to highlighting the concepts and parts you will use in your presentation. It is also important that you show the connection between the sources, that is, how they come together to collaborate for your presentation. We must not forget that you must have different sources, that is, different media, such as websites, books, magazines, interviews, videos, among others.
After you have highlighted which parts of the sources you will use in the presentation, you should reread those parts and make topics about which point of those parts will be used in your presentation, that is, you must show the most revealing points, those to which you won't talk about.
Which compound is produced by a neutralization?
H2O(l)
HNO3(aq)
H3PO4(aq)
Ca(OH)2(s)
Explanation:
HNO3(aq) is the compound produced by a neutralization
Which of the following correctly labels the solute and solvent in a solution of ocean water?
Solute: Salt, Solvent: Water
Or
Solute:Water,Solvent:Salt
Hello there!
The solute is salt, and the solvent is water. So the answer is #1.
PS. Can I have Brainliest?
why is the average number of fish species not a whole number?
Answer:
Because in order to find the average, you need to divide by the number of sites tested. Sometimes that doesn't divide evenly.
Explanation:
Reacts with water to produce OH- ions.
This applies to:
Acids
Bases
Neutral solutions
Both Acids and Bases
Answer:
Bases
Explanation:
According to a Swedish scientist called Svante Arrhenius, a base is a substance that dissociates into hydroxide ions (OH-) when in an aqueous solution i.e. when dissolved in water.
For example, sodium hydroxide (NaOH) will dissolve in water and dissociate into the following;
NaOH (aq) → Na+ (aq) + OH- (aq).
Hence, according to this question, the reaction with water to produce OH- ions is only applicable to BASES in accordance to Arrhenius definition.
What is the difference between the total number of California condors in 1982 and the total population in 2016?
Answer:
The California Condor is on the verge of extinction. There were three individuals, all males, known to be living free in late 1986. That was a drop from fifteen wild birds (including five breeding pairs) known to have been present in 1984. Twenty-one condors were also alive in captivity toward the end of 1986.
Explanation:
Please Help !!
The weak base ionization
constant (Kb) for CIO is
equal to:
Answer:
The answer for CIO- weak base ionization constant kb would be [HCIO][OH-]
__________
CIO-
Explanation:
HOPE YOU HAVE A WONDERFUL DAY BEAUTIFUL.
Which of the following relationships can be measured in light years?
the length of time it takes light to reflect from a plane mirror
the amount of light absorbed by the Earth
the index of refraction of a mirage
the distance between stars and galaxies
All of the choices are correct.
which of the following statements is not true?
A. covalent compounds have low melting and boiling points.
B. covalent bonds occur between nonmetals.
C. covalent compounds are often gases or liquids.
D. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules.
Answer:
I think option (D)is not true
HELP
In the following acid-base reaction,
NH4+ is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
Answer:
C
Explanation:
The NH4^+ is the conjugate acid because it is formed from the base by accepting a proton.
Browstead - Lowry definitionAn acid base reaction can be defined according to;
ArrheniusBrownstead - LowryLewisThe NH4^+ is the conjugate acid because it is formed from the base by accepting a proton as can eaily be observed in the reaction equation as shown.
Learn more about acid base reaction: https://brainly.com/question/11256472?r
Which reaction occurs when equivalent quantities of H" (or H30) and OH" are mixed?
1.
oxidation
2.
reduction
3
hydrolysis
4.
neutralization
Answer: A reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.
Explanation:
When acid and base chemically combine together to form sat and water then it is know as neutralization reaction.
An acidic substance gives hydrogen ions [tex](H^{+})[/tex] on dissociation and a basic substance gives hydroxide ions [tex](OH^{-})[/tex] on dissociation.
For example, [tex]H^{+} + OH^{-} \rightarrow H_{2}O[/tex] is a neutralization reaction where an acid and base are mixed together to form water.
No salt is formed as because here the reactants are not present as compounds.
In a hydrolysis reaction, water molecule(s) is added to the reactant molecules.
For example, [tex]CH_{3}COOCH_{3} + H_2O \rightarrow CH_{3}COOH + CH_{3}OH[/tex]
Oxidation is the process of addition of oxygen to a molecule and removal of hydrogen.
Reduction is the process of addition of hydrogen in a compound and the removal of oxygen atom.
Therefore, we can conclude that reaction which occurs when equivalent quantities of H" (or [tex]H_{3}O^{+}[/tex]) and OH" are mixed is a neutralization reaction.
