The specific heat of an unknown substance is 0.96 J/(g·ºC).
What is the specific heat capacity?The specific heat capacity of a substance can be described as the quantity of heat needed to raise the temperature in one unit of substance by 1 degree Celcius.
Whenever the heat is lost or absorbed there is a change in the temperature of the substance:
Q = mCΔT
Given, the amount of energy released, Q = 12 cal
The initial temperature of the substance = 25.0ºC
The final temperature of the substance = 20.0ºC
The change in the temperature of a substance, ΔT = 25 -20 = 5°C
The mass of the substance, m = 2.50 g
We have to find the specific heat capacity of an unknown substance.
12 cal = 2.50 g × C × 5°C
C = 0.96 J/(g·ºC)
Therefore, the specific heat capacity of an unknown substance is equal to 0.96 J/(g·ºC).
Learn more about specific heat capacity, here:
brainly.com/question/28302909
#SPJ2
The amount of heat needed to raise a substance's temperature by one degree Celsius per gram is known as specific heat. The specific heat in J/(gºC) of an unknown substance is 0.96 J/gºC.
The amount of heat needed to increase the temperature of the entire substance by one degree is the heat capacity of a substance. Specific heat capacity is what is used when the substance's mass is equal to one.
The hydrogen bonds in water, which account for its high specific heat.
The expression used to calculate the specific heat capacity is:
Q = mcΔT
Here Q = 12 Cal
m = 2.50 g
T₁ = 25.0ºC
T₂ = 20.0ºC
ΔT = 5°C
12 cal = 2.50 g × c × 5°C
c = 0.96 J/gºC
To know more about specific heat, visit;
https://brainly.com/question/31608647
#SPJ3
Describe how you might prepare disodium phosphate given a solution of phosphoric acid, 0.500 molar and a solution of sodium hydroxide base, 0.500molar.
Explanation:
When 2 moles of sodium hydroxide (NaOH) reacts with 1 mole of phosphoric acid (H3PO4) it gives 1 moles disodium phosphate Na2HPO4 and 2 moles of water.
0.5 molar solution indicates half moles of molecules are present in per ltr solution.
to prepare disodium phosphate you need to dilute phosphoric acid solution to 0.25 molar and add equal quantity of 0.5 molar solution.
[tex]2 NaOH + H_3PO_4 \: \rightarrow \: Na_2HPO_4 + 2 H_2O[/tex]
Thanks for joining brainly community!
4. Calculate the total amount of heat a beaker of water would absorb sitting in the sun. The water has a mass of 500g, a specific heat of 4.184 (J/gx°C), and had a change in temperature of 22 °C.
Answer:
46024 j or 46.024 kj
Explanation:
500 gm * 4.184 j/(gm-C) * 22 C = 46024 j
The heat energy absorbed by water of mass 500 g and specific heat capacity of 4.184 J/°Cg with a temperature rise to 22 degree celsius is 46024 J.
What is specific heat capacity?Specific heat capacity of a substance is the heat energy required to raise the temperature of that substance by one degree celsius per mole. It is an intensive property and does not dependent on the total amount if the substance.
Specific heat capacity of a substance is a constant and water have this value of 4.184 J/°Cg. The heat energy q absorbed or evolved from a system is related to the specific heat capacity C , mass M and temperature change ΔT occured on the system as in equation written below:
q = mC ΔT .
The heat energy of water of mass 500 g absorbed for a temperature change of 22 °C can be calculated as follows:
q = 500 g × 22 °C × 4.184 J/°Cg
= 46024 J.
Hence, the total heat of absorption of water for the given mass and temperature change is 46024 J.
To find more about heat capacity, refer the link below:
https://brainly.com/question/28302909
#SPJ2
Calculate the volume of 2.30 moles of gas exerting a pressure of 2.80 atm at 155°C.
Answer:
28.83dm³
Explanation:
Using ideal gas equation
PV=nRT
P=2.80atm
n=2.30
R=0.082
T=155°C (155+273=428Kelvin)
V=nRT/P
V=2.30×0.082×428/2.80
V=28.83dm³
pls i need the correct answer auto report when you're not sure to your answer or its wrong
which of these materials is best used as a lubricant to reduce friction on gears
a.sand
b.oil
c.water
d.alcohkl
Which type of reaction is shown?
(1 point)
Fission is shown because mass is being converted into energy as nuclei combine
Fission is shown because nuclei are being split into smaller and smaller places
Fusion is shown because mass is being converted into onergy as nuclei combine
Fusion is shown because nuclei are being split into smaller and smaller places,
According to the image in this question, the type of reaction shown is that of fission because nuclei are being split into smaller and smaller places.
What is nuclear fission?Nuclear fission in radioactivity is the process whereby the nuclei of atoms split into smaller particles.
In the above diagram, an atom of uranium is labeled and its nucleus is shown to split into smaller particles in succession.
Therefore, the reaction exemplifies a nuclear fission because nuclei are being split into smaller and smaller places.
Learn more about fission at: https://brainly.com/question/2732120
What conversion factor would be used to solve the following problem:
Convert 8.99g of CO2 to moles of CO2
A) Molecular weight
B) Avogadro's number
C) Grams
D) Density
A) Molecular weight (MW)
moles = mass : MW
need help with this ty
Answer:
The correct answer to first question is C
I only know this one.
Explanation:
PLEASE MARK ME BRAINLIEST IF MY ANSWER IS CORRECT PLEASE
I also kno wtge answer to question 7 is A
what is hydrogen alkali metal or halogen
Answer:
Hydrogen is neither an alkali metal or halogen.
Explanation:
It has the properties of both groups and so it's position is uncertain.
Which form of water is classified as part of the precipitation phase of the water cycle?
A:lakes
B:vapor
C:rivers
D:snow
Answer:
Snow
Explanation:
Precipitation means when water falls from the sky, and snow is frozen water
2. What are the main processes by which metamorphic rock is created?
erosion and deposition
melting and volcanic activity
erosion and heat
heat and pressure
Bonding with intermolecular forces:
1.) is CH3F a hydrogen bonding? yes or no?
2.) is CH3F dipole-dipole interactions? Yes or no?
3.) is CH3F a london dispersion forces? Yes or no?
Explanation:
1.) is CH3F a hydrogen bonding? yes or no? = No, CH3F is not a hydrogen bonding beacuse the molecule lacks hydrogen atoms bonded to nitrogen, oxygen, or fluorine; ruling out hydrogen bonding.2.) is CH3F dipole-dipole interactions? Yes or no? = Yes, CH3F is a dipole-dipole interactions beacuse in it's molecule, there are no metal atoms to form ionic bonds3.) is CH3F a london dispersion forces? Yes or no?= Yes, CH3F is a london dispersion forces because in it's molecule, there are no metal atoms to form ionic bonds .The intermolecular forces present in the bonding of CH₃F are dipole-dipole interactions and London dispersion forces.
1.) No, CH₃F does not exhibit hydrogen bonding. Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom such as fluorine, oxygen, or nitrogen. In CH₃F, the hydrogen atom is bonded to carbon, which is not highly electronegative.
2.) Yes, CH₃F exhibits dipole-dipole interactions. Dipole-dipole interactions occur between molecules that have permanent dipoles due to the electronegativity difference between the atoms. In CH₃F, the fluorine atom is more electronegative than the carbon and hydrogen atoms, resulting in a polar molecule with a permanent dipole moment.
3.) Yes, CH₃F exhibits London dispersion forces. London's dispersion forces, also known as Van der Waals forces, are present in all molecules and arise from temporary fluctuations in electron distribution. Although CH₃F has dipole-dipole interactions, it also experiences London dispersion forces due to the temporary shifts in electron density.
Hence, the bonding in CH₃F was explained above.
Learn more about intermolecular forces here:
https://brainly.com/question/31797315
#SPJ 6
use the equation: 2Mg + O2→ 2MgO
Calculate the number of moles of oxygen needed to react with 6.00 moles of Mg.
Answer:
3 moles of O2 needed
Explanation:
2 moles of Mg to one mole O2
so 3 moles of O2 needed
How many atoms are in 0.560 moles of iron?
Answer:
3.37 × 10²³ atoms
Explanation:
Number of atoms = number of moles × 6.02 × 10²³
Number of atoms = 0.560 × 6.02 × 10²³
Number of atoms = 3.37 × 10²³ atoms
Identify the combustion reaction.
C4H12 + 7O2 ⟶ 6H2O + 4CO2
2H2 + O2 ⟶ 2H2O
Al2S3 ⟶ 2Al + 3S
Cl2 + 2KBr ⟶ 2KCl + Br2
Answer:
2kci,3H12,702,c02g k 4 t v6vuvi
If a sample originally had 120 atoms of carbon-14, how many atoms will remain after 17,145 years? Assume the half life of C14 is 5715 years.
Answer:
15 atoms left after 3 half lives
Explanation:
17145 y / 5715 y/halflife = 3 half lives
(1/2)^3 = 1/8 of original is left
1/8 ( 120 atoms) = 15 atoms left
what were possible experimental reasons for error in determining the neutralizing power of antacids ?
1000*
Explanation:
the deter monagex has to neutralize power because of the error and that leads to 1000*
Which of these events leaves small pieces of rocks in new places? (4 points)
a
Deposition
b
Weathering
c
Erosion
d
Oxidation
Answer:
Deposition
Explanation:
Deposition is a process that lays down sediment and changes the shape of the land.
Why Hydrochloric acid (HCl) is not an oxidizing agent?
please help I need proper explanation!
Answer:
Strong acids completely dissociate in water to H+ ions and extremely weak conjugate base anions.
Explanation:
its a weak acid
Answer:
because its didn't form H+ ions when react with water
If the cell is somehow operated under conditions in which it produces a constant voltage of 1.50 V , how much electrical work will have been done when 0.487 mL of Br2(l) has been consumed
For a cell operated to produce a constant voltage of 1.50 V, the electrical work done is mathematically given as
W=2.077*10^{-7}
What is the electrical work done?Generally, the volume of Br2 is mathematically given as
[tex]Vb=\frac{0.38*3.12}{159.809}[/tex]
Vb=7.18*10^-3ml
Therefore, the quantity of charge
q=(1.436*10^-2)*9.644*10^4
q=1.385^{-4}c
In conclusion, work done
W=Eq
W=1.50*1.385^{-4}
W=2.077*10^{-7}
Read more about Work
https://brainly.com/question/756198
A gas occupies a volume of 1.0 L at 25°C. What volume will the gas occupy at 100°C?
A)
4.0 L
B)
0.80 L
C)
1.3 L
D)
1.0 L
Answer:
A
Explanation:
1.0 L * 4 = 4L volume that the gas can occupy at 100 degree Celsius
The solubility of magnesium fluoride, , in water is g/L. What is the solubility (in grams per liter) of magnesium fluoride in 0.29 M of sodium fluoride,
Answer:
1.457*10^-8 grams
Explanation:
First we want to find the molar concentration of MgF2. We can do this by dividing 0.016 (the solubility in grams of MgCl2 in a litre of water) by its molar mass (approx. 62.3 grams). Thus, the molar solubility of MgF2 is 2.57*10^-4 M.
Next, we must calculate the Ksp of MgF2. The equilibrium expression is:
MgF2⇄Mg+2F
Thus [tex]Ksp=[Mg^+][F^-]^2[/tex]
This means that, in equilibrium, there are 2.57*10^-4 M of [tex]M^+[/tex] and 5.136*10^-4 M of [tex]F^-[/tex]
Plugging in the above information, our Ksp for MgF2 is approximately 6.78*10^-11
Next we will need to use the RICE table. Since there is already 0.29M of NaF dissolved, there is initially 0.29M of [tex]F^-[/tex].
R: MgF2 ⇄ [tex]Mg^{+}[/tex]+2[tex]F^-[/tex]
I: N/A 0 0.29M
C: N/A +x +x
--------------------------------------------
E: N/A x 0.29+x
To make calculations easier, we will assume that 0.29+x≈0.29
This means that Ksp=0.29x=6.78*10^-11
Therefore, x≈2.338*10^-10M
Multiply that by 62.3 and we get around 1.457*10^-8 grams.
Science Task (
The transfer of thermal energy by the movement of liquids or gases is called
Convection is the movement of fluid (this can wether be liquid or gas) and as they move, they carry heat along with them.
Answer:
Convection
More info:
Heat transfers include the following: Conduction, Convection, and Radiation.
Conduction is the transfer of heat through molecules by direct contact. This takes place in the three phases of matter, but conduction works best in materials with close contact molecules of simple molecules.Convection, (definition above)Radiation is the transfer of heat through electromagnetic waves. Unlike Conduction and Convection, Radiation doesn't need matter to help with heat transfer.I am open to corrections if I accidentally included false information :).
#learnwithbrainly
Which of the following is not true concerning aluminum?
Group of answer choices
Aluminum weighs twice as much as the same size piece of steel.
It takes about two metric tons of aluminum oxide to produce one metric ton of aluminum.
Aluminum corrodes more slowly than iron does.
It takes about 17,000 kilowatt hours of electricity to produce one metric ton of aluminum.
The statement that is true about aluminum is that it corrodes more slowly than iron does.
What is Aluminum?Aluminum is a slivery white metal that have atomic number of 13. It is most coon metal and make more than 8% of the Earth's core mass. It's also the third most common chemical element Earth. It is malleable and soft.
It is use for making kitchen utensils, cans and so on.
Aluminum cannot be decomposed by chemical methods.
Therefore, The statement that is true about aluminum is that it corrodes more slowly than iron does.
Learn more about aluminum below.
https://brainly.com/question/246454
If a solution has a poh of 5.2 the [oh-] of the solution is
Answer:
6x10^-6 M
Explanation:
The relationship between pOH and [OH-] is
pOH = -log[OH-]
Solving this equation for [OH-] is
[OH-] = 10^-pOH
Plugging in the pOH makes
[OH-] = 10^-5.2
= 6.31x10^-6
Rounding to 1 sig fig since pOH and pH sig figs are only the number of decimals means to round to 1 sig fig or
6 x 10^-6 M
Which of these are animal adaptations that help animals live in the deciduous forest biome? Select all that apply.
Round builds
Little feet for snow
Harder outer skin to reduce loss of water
Hibernation
Help fast!
Answer:
Hibernation
Explanation:
deciduous means trees that lose leaves during winter
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label for H2O?
Group of answer choices
ℓ
Answer:
Transcribed image text: Answer.
the following question for the mixing of gaseous hydrogen chloride with water to make hydrochloric acid. HCl) + H2O(2) → H30*) + Cl (2) What is the phase label on HCI? aq
In chemistry and biology, hydrolysis refers to a twofold decomposition reaction in which water participates.
The conjugate base in HCl H2O H3O+ Cl is what?HCl's conjugate base is Cl in the reaction HCl+H2O+H3O++.
An acidic solution is created when hydrogen chloride gas and water interact. The reaction's equation is displayed. Cl - + H3O + HCl + H2O
Hydroxide ion is base 2, and its conjugate acid (water) is acid1. Acid1 is HCl, and its conjugate base is base1.
The conjugate base of hydrochloric acid is the chloride ion. The hydroxide ion's conjugate acid is water
H3 O+1 is the conjugate acid of H2 O. The electrical charge on water increases by one when one hydrogen ion is added. Hydrogen is also known as H3 O+1.
In a reversible chemical reaction, H 2O and HCl join upon contact to create hydronium cations [H 3O] + and chloride anions Cl : HCl + H 2O [H 3O] + + Cl. The resulting mixture is a potent acid known as hydrochloric acid.
To learn more About hydrolysis, Refer:
https://brainly.com/question/4352413
#SPJ2
alloy is combined by physically or chemically
Answer:
alloy is the homogeneous mixture of metal and metal or metal and non metal
Answer:
Yes, an alloy is combined physically or chemically into a separate compound. And a mixture of
Explanation:
Alloys have physical properties between those constituent metals and chemical properties remain unaffected. But alloys can be separated physically.
A 76.89 g sample of a hydrocarbon(CxHy) has a mass of hydrogen that is equal to 10.45 g. Given this information, determine the empirical formula of this hydrocarbon. {MMC=12.01 and MMH=1.008}.
I’ll give the fastest person brainliest!!!!!! I need the answer asap!!!
Answer:
the empirical formula will be CH2
Explanation:
C
[tex] = \frac{66.44}{12} \\ = \frac{5.536}{5.536} \\ = 1 \\ = 1 \\ h \\ \frac{10.45}{1} \\ = \frac{10.450}{5.536} \\ = 1.88 \\ = 2[/tex]
particles in the liquid state have _________ IM attractive forces than in the gas state
Answer:
Particles in the liquid state have greater IM attractive forces than in the gas state.
How many molecules of methane (CH4) do you need to burn in order to get 9.03 x 1023
molecules of carbon dioxide (CO2)? Avogadro's number is 6.02 x 1023 molecules/mol.
CH4 + O2 - CO2 + 2H2O
Answer:
9.03*10^23 molecules CH4
Explanation:
In the equation CH4 + O2 -> CO2 + 2H2O, the molar ratio of CH4 to CO2 is 1:1. It takes 1 mole of CH4 burned to form 1 mole of CO2. If we convert molecules to moles, we do 9.03 x 10^23 divided by 6.02 x 10^23 = 1.5 moles of CO2. Since we know the ratio is 1:1, that meant it would take 1.5 moles of CH4 burned to make that much CO2. So we convert our 1.5 moles of CH4 into molecules by multiplying 1.5 * 6.02 x 10^23 which equals 9.03*10^23 molecules CH4.