Enthalpy change is the difference between energy used and energy gained. The change in enthalpy of the liquid mercury is 0.0231 kJ.
What is the enthalpy change?Enthalpy change is the difference between the energy used to break chemical bonds and the energy gained by the products formed in a chemical reaction.
The enthalpy change is given by,
[tex]\rm \Delta H_{rxn} = \rm q_{rxn}[/tex]
and,
[tex]\rm q = mc\Delta T[/tex]
Given,
Mass of the liquid mercury (m) = 11.0 gm
The specific heat of mercury (c) = 0.14 J per g per degree Celsius
Temperature change = 15 degrees Celsius
Enthalpy change is calculated as:
[tex]\begin{aligned} \rm q &= \rm mc\Delta T\\\\&= 11 \times 0.14 \times 15\\\\&= 23.1 \;\rm J\end{aligned}[/tex]
Therefore, 0.0231 kJ is the change in enthalpy.
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What is the difference between clastic and chemical sedimentary rocks?
Clastic rocks are classified by grain shape, grain size, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. Chemical rocks are classified mainly by the composition of minerals in the rock.
hi again, hope this helps ^^
Answer: The difference is clastic rocks are classified by grain size, grain shape, and sorting. Chemical sedimentary rocks are precipitated from water saturated with dissolved minerals. They are also mainly classified by the composition of minerals that are in the rock.
Explanation:
Science edpuzzle
All of the following describe a chemical change, EXCEPT…
Answer:
B
Explanation:
You might want to pick "A sound is created" No that answer is just fine. If you listen when sitting around a campfire, you might hear the crackling of what is burning. Burning is an excellent example of a chemical change. Wood becomes ash.
The answer is a change in the state of matter. (B). That need not indicate a chemical change. In fact, most of the time, a change in matter is a physical change.
Answer: B
can someone dm me if u know about chemistry plsss
The main purpose of filtration is to separate particles and fluid; therefore, the words to complete the phrase are particles and fluid.
What is filtration?This is a method used to separate particles in a suspension (substance that contains fluid and large particles).
What is the purpose of filtrating?The main idea of filtrating a substance is to separate the particles from the fluid.
What is an example of filtration?When tea is made, a filter is usually used to separate the leaves (solid particles) from the fluid.
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HELP ASAP!
A student builds an electric motor with 6 loops in the coil of wire and applies a voltage of 1.5 volts. Make a prediction about how fast the motor would spin compared to the ones you observed in your experiment. Support your prediction with evidence. Explain your prediction using cause-and-effect relationships.
If the given emf (1.5 volts) is greater than the emf you observed in your experiment, then the motor with 1.5 volts will move faster.
Speed of the motorThe speed of the motor depends on the strength of the induced emf in the coil of the electric motor.
emf = NdФ/dt
where;
N is number of loopsdФ is change in magnetic fluxF = BIL = qvB
where;
I is the induced currentAs the induced current in the coil of the motor increases, the speed of the motor will increase.
Thus, if the given emf (1.5 volts) is greater than the emf you observed in your experiment, then the motor with 1.5 volts will move faster.
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Answer:
The motor will spin slower
Explanation:
The other three motors have either 9, 12, or 15 loops of wire. The more loops, the faster it goes.
Place the followinf substances in order of increasing vapor pressure nf3 nh3 bcl3
The substances in order of increasing vapor pressure NF₃ NH₃ BCl₃ is NH₃< NF₃ < BCl₃. The correct option is A.
What is vapor pressure?The pressure is exerted by a vapor in thermodynamic equilibrium with the developing close (solid or liquid) in a closed system at a given temperature is referred to as vapor pressure (or equilibrium vapor pressure).
Vapor pressure can be calculated by Clausius-Clapeyron equation.
Thus, the correct option is A, NH₃< NF₃ < BCl₃.
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Which is characteristic of an exothermic reaction?
A. Material absorbs heat from its surroundings. B. Molecules in a material become more orderly.
C. Molecules in a material become less orderly. D. Material releases heat to its surroundings.
Answer:
D. Material releases heat to its surroundings.
Explanation:
use the ex in exothermic to remember the word
exit
as in
heat is exiting the material
khan academy
Which of the following factors will only affect the reaction rate of a solid?
OA. Concentration
B. Temperature
C. Surface area
D. Catalyst
Answer:
B. Temperature
Explanation:
The rate of a reaction is defined as the speed at which the reactants are converted into products. Factors influencing the rate of a reaction are concentration, catalyst, temperature, surface area, and pressure, etc.
In case of the reaction rate of gases, pressure will only have its affect as pressure do not have any influence on solid and liquid.
i need help pleaseeeeeeee
The unit for molar mass is
Jude has a mutation in the gene that codes for a certain digestive enzyme. However, these enzymes function normally.
What best explains how this is possible?
A. The mutation affects only one base.
B. The mutation affects only one amino acid.
C. The mutation does not get copied over to his mRNA.
D. The mutation does not alter the amino acid sequence for the enzyme.
Answer:
b
Explanation:
if 0.01 mol neon gas at a particular temperature and pressure occupies a volume of 0.225 L. what volume would 0.05 mol neon gas occupy under the same conditions
If 0.01 mol of neon gas at a particular temperature and pressure occupies a volume of 0.225 L, then 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.
Given:
Number of moles of neon gas (n₁) = 0.01 mol
Volume of neon gas (V₁) = 0.225 L
We are required to find the volume of neon gas (V₂) when the number of moles (n₂) is 0.05 mol under the same conditions.
The relationship between the number of moles, volume, and pressure of a gas is given by the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.
Since the temperature and pressure are the same in this case, we can rearrange the ideal gas law equation to solve for the volume:
V = (n₁ * V₁) / n₂
Substituting the given values into the equation:
V₂ = (0.01 mol * 0.225 L) / 0.05 mol
V₂ = 0.00225 L / 0.05 mol
V₂ = 0.045 L/mol
Therefore, 0.05 mol of neon gas would occupy a volume of 1.125 L under the same conditions.
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how much water should be added to 15g of Common salt to prepare a solution of 15% concentration?
I'll mark you as brainliest if you show with steps
Explanation: To make the salt solution of 15% with 15 gm as the mass of the solute, the mass of the solvent must be 85 gm. Therefore, 85 gm of water should be added.
Help please!!! Its chemistry last unit
Answer:
Number 4 is the answer
Explanation:
I hope it will help you
A solution has a ph of 4. 75. What is the hydronium ion concentration? is the solution acidic or basic?
The hydronium ion concentration of a solution is 56,263. The solution is acidic.
What is pH?pH is potential hydrogen. It is the measurement of the acidity and basicity of any solution.
Given the pH of solution is 4.75
By the formula of hydronium ion
[tex]\rm pH = -log[H_3O^+]\\\\4.75 = -log[H_3O^+]\\\\antilog - 4.75 [H_3O^+]\\\\H_3O^+ = 56,234[/tex]
Thus, the hydronium ion concentration of a solution is 56,263. The solution is acidic.
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Chlorine gas can be produced in the laboratory by the reaction
Chlorine gas can be produced in the lab by the reaction is K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ +7H₂O + 3Cl₂.
How chlorine gas is produced in laboratory?Chlorine gas is produced in many ways in laboratory. One of the ways is from potassium chromium oxide with hydrochloric acid.
The result is potassium chloride and chromium chloride and water and three molecules of chlorine.
Thus, the reaction is K₂Cr₂O₇ + 14HCl → 2KCl + 2CrCl₃ +7H₂O + 3Cl₂.
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A scientist recorded the following observations about a rock sample in her journal.
The rock is porous.
The rock has multiple layers.
The rock contains a fossil.
What type of rock did the scientist collect?
igneous , igneous , ,
sedimentary , sedimentary , ,
metamorphic , metamorphic , ,
obsidian
Answer:
Sedimentary rocks
Explanation:
Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation.
The process of deep sediment burial causes sediment to get compressed and cemented resulting in sedimentary rock. Here the recorded observations of the scientist is about sedimentary rocks. The correct option is B.
What are sedimentary rocks?The rocks which are formed by the deposition and subsequent cementation of the material at the surface of the earth within the bodies of water can be defined as the sedimentary rocks. They are of three types. They are organic, clastic and chemical sedimentary rocks.
Sedimentary rocks are generated by the accumulation of the existing rocks or fragments of extinct organisms on the earth surface. They are formed from the pre-existing rocks or pieces of once living organisms.
The common sedimentary rocks are sandstone, limestone and shale. Biologic sedimentary rocks are formed when large number of living things die. Chert is an example for this.
Thus the correct option is B.
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Explain 3 factors which you must consider in preferential discharge
Answer:
Factors that determine preferential discharge of ionsFactors Affecting the Preferential Discharge of Ions in Electrolysis
1. The position of ion in electrochemical series.2. The concentration of the ion.3. The nature of the electrode.4. Relationship between the position of ions in the electrochemical 5. Concentration of the ions in the electrolyte.
What happens to the level of hydronium ions in a solution when the number of hydroxide ions decrease
When the number of hydroxide ions decrease then the level of hydronium ions in a solution increases.
What is pH?pH of solution gives idea about the acidity or basicity of the solution and pH will be represented as:
pH = -log[H⁺]
If in any solution number of hydroxide ions decreases as compared to the concentration of hydronium ions, then the concentration of hydronium ions increases as a result of which acidity of the solution also increases.
Hence, level of hydronium ions increases.
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Write the balanced equation for naoh and hcl conjugae base
The balanced equation for NaOH and HCl is HCl(aq) + NaOH(aq) ⇌ NaCl(aq) + H₂O(l).
What is a balanced equation?A balanced equation has the reactants are on the left side of the arrow, whereas the products are on the right.
The number in front of a chemical formula denotes the number of moles in a compound. The number of atoms in a single molecule is indicated by subscripts (numbers below an atom).
Thus, the balanced equation for NaOH and HCl is HCl(aq) + NaOH(aq) ⇌ NaCl(aq) + H₂O(l).
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How many moles of sulfur dioxide are produced with 6.0 mols of carbon dioxide?
Answer:
228.38g of CO2
Explanation:
paragraph about earth getting hotter /will give brainliest
Answer:
Scientists have measured global temperatures for over a hundred years and see that the Earth is getting hotter. The trend can be best visualized by comparing each year’s average temperature with the long-term average. This figure shows observations of the world’s annual average temperature made by the National Oceanic and Atmospheric Administration (NOAA). It compares each year’s temperature to the average over the entire century. Blue bars are years that were cooler than average and red bars are years that were warmer than average. In recent decades, the years have always been hotter. If there were no long-term temperature trend, you would expect a mix of red and blue bars throughout the record. That’s not what we see.
Extra greenhouse gases in our atmosphere are the main reason that Earth is getting warmer. Greenhouse gases, such as carbon dioxide (CO2) and methane, trap the Sun's heat in Earth's atmosphere.
Marine heat waves have already doubled in number since 1980 and are expected to become more intense as temperatures rise
Explanation:
A metal wire has a length l and a cross-sectional area a. The resistance of the wire is directly proportional to
The resistance of the wire is directly proportional to the length of the wire, l.
What is resistance?Resistance is given as the ability of the wire to resist or stop the flow of current. The resistance of the wire can be given to have the formula:
[tex]\rm Resistance=\dfrac{length }{area}[/tex]
Thus, it can be given that the resistance of the wire is inversely proportional to the area of the cross-section and directly proportional to the length.
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Which of the following is an example of a chemical change?
a rock being crushed into pieces by a hammer
a rock becoming smaller over time due to wind
a rock's appearance changing over time due to exposure to acid rain
all of the above
Answer:
a rock's appearance changing over time due to exposure to acid rain
♡ The Question/Task(s)! ♡
✦ || Which of the following is an example of a chemical change?
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♡ The Answer(s)! ♡
✦ || The answer is, "A rocks appearance changing over time due to exposure to acid rain"!
I apologize in advance if the answer is incorrect! ♡
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♡ The Explanation(s)/Step-By-Step! ♡
✦ || The acid rain is caused by chemical reactions from sulfur dioxide, nitrogen oxides, and other chemicals that combine with the atmosphere's oxygen and water causing the chemical change!
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♡ Tip(s)! ♡
✦ || No Tips Provided!ヽ(>∀<☆)ノ
Over 100 existing elements are listed and classified on the ___
Answer:
the anser is the periodic table of the elements
Explanation:
What is primarily released in radioactive decay?
A. Photons in the visible range
B. Radio frequency waves
C. Nuclear quarks and gluons
D. Particles or electromagnetic waves
What is primarily released in radioactive decay is : ( D ) Particles or electromagnetic waves
What is radioactive decay ?Radioactive decay is the breakdown of the nuclei of atoms which results in the release of energy and particles ( matter ) from the atomic nucleus. the energy released in the process is known as ionizing energy.
The primarily released particles in a radioactive decay are the alpha,beta and gamma particles
Hence we can conclude that primarily released in radioactive decay is : ( D ) Particles or electromagnetic waves
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The purpose of hydrogenating unsaturated fats is to.
Why do rocks on the ocean floor form a pattern of magnetized stripes? hurry hurry pls pls pls HURRY
Answer:
BEST ANSWER :The rocks contain iron that points in the direction the rocks move away from the ridge.
Hydrogen gas is collected over water at a total pressure of 95.0kPa. The volume of gas collected is 28.0mL at 25.0˚C. Determine the partial pressure of the hydrogen gas if the water vapor pressure is 3.17kPa.
GAS LAW:
Given:
Unknown:
Formula:
Solution:
Dalton's Law
P tot = P H₂O + P gas
95.0 = 3.17 + P gas
P gas = 91.83 kPa
Which halogen has the highest boiling point.
a.) f2
b.) cl2
c.)br2
d.) i2
Answer:
D
Explanation:
Recall that boiling points increase with stronger intermolecular forces.
Because halogens are diatomic molecules, they are nonpolar and lack the ability to form hydrogen bonds. Therefore, the only IMF they possess are London dispersion forces.
Recall that London dispersion forces increase with increasing polarizability, which is higher in larger molecules due to the increased number of electrons.
The largest halogen is iodine (I₂). Therefore, it will have the strongest IMF and hence the highest boiling point.
1. Write the balanced equation for the decomposition of hydrogen peroxide
The balanced equation for the decomposition of hydrogen peroxide is H₂O₂(aq)→2H₂O(l)+O₂(g).
What is decomposition reaction?Decomposition reactions are those reactions in which a compound will decompose into small molecules.
Hydrogen peroxide will decompose into water molecule and oxygen gas, balanced chemical equation will be represented as:
H₂O₂(aq) → 2H₂O(l) + O₂(g)
Where all atoms are present in equal quantities on both side of the equation.
Hence balanced decomposition reaction of H₂O₂ is H₂O₂(aq)→2H₂O(l)+O₂(g).
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