Answer: The specific heat capacity of the sample is [tex]0.899 J/g^{o}C[/tex] and as heat is released in this reaction so it is exothermic in nature.
Explanation:
Given: Mass = 120.4 g
Heat energy released = -7020 J
Initial temperature = [tex]90.5^{o}C[/tex]
Final temperature = [tex]25.7^{o}C[/tex]
Formula used is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat capacity
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\-7020 J = 120.4 g \times C \times (90.5 - 25.7)^{o}C\\C = \frac{-7020 J}{120.4 \times (-64.8^{o}C)}\\= \frac{7020 J}{7801.92} J/g^{o}C\\= 0.899 J/g^{o}C[/tex]
When heat is released in a process or reaction then it means it is exothermic in nature.
Thus, we can conclude that the specific heat capacity of the sample is [tex]0.899 J/g^{o}C[/tex] and as heat is released in this reaction so it is exothermic in nature.
Can someone please help me with science.
Answer:
The tendency of an object to resist changes in its state of motion varies with mass. Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.
calculate the ph of the solution [oh-] = 1x 10-11 m
a. 11.0
b. 12.0
c. 2.7
d. 3.0
Answer:
d. 3.0
Explanation:
First we calculate the pOH of the solution, using the following formula:
pOH = -log[OH⁻]pOH = -log[1x10⁻¹¹ M]pOH = 11.0Using the pOH we can calculate the pH of the solution, keeping in mind the relationship between pH and pOH:
pH = 14.0 - pOHpH = 14.0 - 11.0pH = 3.0The answer is option d.
If an 18g object occupies 2 cm3 of space, what is its density
Is Ca +O2 ?-->CaO balanced ? explain why or why not
ANSWER THESE 3 QUESTION AND I WILL GIVE OUT THE BRAINLIEST
1. what is a positive acceleration
2. what is a zero acceleration
3. what is a negative acceleration
Answer:
A positive acceleration means and increase
A negative acceleration is a decrease
a zero acceleration is a constant movement so its not increasing or decreasing just constant
Explanation:
What is a positive acceleration ?
[tex] \sf \blue{Answer}[/tex]If the velocity of an object increases with time, its acceleration is positive.
[tex] \sf \pink{Question}[/tex]What is a zero acceleration ?
[tex] \sf \blue{Answer}[/tex]Zero acceleration is an acceleration, just with zero magnitude. Motion with constant velocity is just a special case of motion with uniform acceleration.
[tex] \sf \pink{Question}[/tex]What is a negative acceleration ?
[tex] \sf \blue{Answer}[/tex]A negative acceleration means you will subtract from the current value of the velocity, and a positive acceleration means you will add to the current value of the velocity. ... And if the acceleration points in the opposite direction of the velocity, the object will be slowing down.
If you have 4 moles of CaCl2 how many moles of HCI can you make
Equation- CaCl2 +2H2O= Ca(OH)2+2HCl
Answer:
If you hace 4 moles of CaCl₂, you can make 8 moles of HCl.
Explanation:
The balanced equation is
CaCl₂ + 2 H₂O → Ca(OH)₂ + 2 HCl
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction) , the following amounts of each compound participate in the reaction:
CaCl₂: 1 mole H₂O: 2 molesCa(OH)₂: 1 mole HCl: 2 molesThen you can apply the following rule of three: if by stoichiometry 1 mole of CaCl₂ forms 2 moles of HCl, 4 moles of CaCl₂ form how many moles of HCl?
[tex]moles of HCl=\frac{4 moles of CaCl_{2}*2 moles of HCl }{1mole of CaCl_{2}}[/tex]
moles of HCl= 8
If you hace 4 moles of CaCl₂, you can make 8 moles of HCl.
PLEASE ANSWER!! DUE TONIGHT!! 10 POINTS!!
Find the density of a cube (to the nearest tenth) with a side of 4 cm. and a mass of 1235 grams. (You do not need to include units in your answer.)
Answer:
19.3
Explanation:
V=4^3 a^3, to find volume with sides
p= 1235/64, Mass/ Volume= Density
Plz Answer Fam & Con Chemistry (8TH GRADE)
Answer:
claw techniques
Explanation:
because it is
what is chemical bonding
Answer:
In simple terms it is when two chemicals bond with each other
Explanation:
For more detailed explanation here's your answer:-
A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of chemical compounds. It has Electrostatic force between the two molecules. It can be either positive or negative ionshow to balance _h2s+ _o2 = _h2o+ _s
Answer:
2H₂S + 1O₂ → 2H₂O + 2S
Explanation:
SOLUTION :-
Balance it by using 'hit & trial' method , and you'll get the answer :-
2H₂S + 1O₂ → 2H₂O + 2S
VERIFICATION :-
In reactant side of equation :-
Number of atoms in H = 2×2 = 4Number of atoms in S = 2×1 = 2Number of atoms in O = 1×2 = 2In product side of equation :-
Number of atoms in H = 2×2 = 4Number of atoms in O = 2×1 = 2Number of atoms in S = 2×1 = 2Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.
Helppp pleaseeeeee ....answer fast
Explanation:
An element is define as a substance which contains only those atoms which have same number of protons. Basically, an element contains atoms of one type only.
For example, a piece of sodium metal will contain only atoms of sodium.
An element can never be divided further into simpler substances. So, in the given figure box 1 is containing atoms of only blue color is an element.
A compound is a substance formed by the chemical combination of two or more different atoms present in a fixed ratio.
For example, [tex]MgCl_{2}[/tex] is a compound which contains atoms of Mg and Cl in a 1:2 ratio.
The box containing pink and yellow balls in not a compound because here atoms are not chemically combined to each other but they are just present as individual atoms in same box. Hence, this is not a compound.
Therefore, when one or more elements are in a fixed ratio joined together they form a compound.
8. The range (rainbow) of colors of visible light can be explained by ROY.G.BIV. What does ROY.G.BIV mean? List out the colors in order.
__________ __________ __________ __________ __________ __________ __________
Answer:red, orange, yellow, green, blue, indigo and violet.
Explanation:
BRAINLIEST IF RIGHT WITH EXPLANATION
Oxygen is pumped into a tank at a pressure of 4.63 atm. After helium is pumped into the tank, the total pressure reaches 20.0 atm. What is the partial pressure of helium in the tank?
Answer:
15.37 atm
Explanation:
According to Dalton's law of partial pressure, the total pressure of a mixture of gases in the tank is a sum of the individual pressures of all the gases. Hence;
PT = P1 + P2 + P3 -----------
So;
Ptotal = Phelium + Poxygen
Poxygen = 4.63 atm
Ptotal = 20.0 atm
Phelium = 20.0 atm - 4.63 atm
Phelium = 15.37 atm
Find the number of molecules equal to 1.46 molecules of CaCl2
Answer:
8.7892x10^23
Explanation:
number of molecules equal number of moles times 6.02x10^23
If the attractive forces in a substance is much less than the
molecular motion, then the substance will be in_____ state.
A) Solid
B)Liquid
C)Gaseous
D)Both A&B
what does Element mean?
A.)The smallest part of matter still retaining chemical properties
B.)Consists of only protons and neutrons
C.)A pure substance, only one type of atom
D.)Two or more atoms held together by chemical bonds
Answer:
C is the answer I believe.
an organism that hunts other organisms for food is a
A. prey
B. predator
C. parasite
D. host
Answer:
B) a predator
A sub-shell with n = 6, l = 2 can accommodate a maximum of:
Answer:
72
Explanation:
2n^2
n=6
2(6)^2=2×36
=72
What two driving factors determine if a reaction will be spontaneous? What must be true of the reaction and those two factors for it to always be spontaneous
Recall that the determining factors for spontaneity of a reaction are the enthalpy and entropy changes that occur for the system. The free energy change of a reaction is a mathematical combination of the enthalpy change and the entropy change.
When both cases are satisfied, i.e. if the change in enthalpy is negative and the change in entropy is positive, the reaction is said to be spontaneous, and thus, enthalpy and entropy are the two driving thermodynamic forces of chemical reactions.
Combustion reactions, such as this fire, are spontaneous reactions. Once the reaction begins, it continues on its own until one of the reactants (fuel or oxygen) is gone. A nonspontaneous reaction is a reaction that does not favor the formation of products at the given set of conditions.
A spontaneous reaction is a reaction that favors the formation of products at the conditions under which the reaction is occurring. ... The entropy of the system increases during a combustion reaction. The combination of energy decrease and entropy increase dictates that combustion reactions are spontaneous reactions.
How is stoichiometry used to calculate energy absorbed when a mass of
solid melts?
O A. Grams solid x mol/g * A Hreaction
B. Grams solid x mol/g * A Hp
C. Grams solid x mol/g * A Hfusion
O D. Grams solid x mol/g * A Hvap
Answer: Option C is correct
Grams solid x mol/g * A Hfusion
Explanation:
This is because from fusion is associated to melting and this is a process where solid particles or substances goes through transition phase and turn to liquid.
There for the stoichiometry is used to calculate energy absorbed when solid mass melt with the formula Grams solid x mol/g * A Hfusion.
What is the density of an object that has a mass of 350 g and a volume of 95 cm?? Would
this object float in water?
Answer:
Density= 3.68g/cm³
The object will sink in water
Explanation:
D=m/v
=350/95
=3.684
≈3.68g/cm³
Water= 1g/cm³
The object will sink in water because the object is denser than the water.
3.684g/cm³ is the density of an object that has a mass of 350 g and a volume of 95 cm³. The object will sink in water.
What is density?The density of a material (volumetric density and specific mass) is its mass per unit volume. The most common sign for density is however the Roman letter D can be used as well. Density is defined mathematically as mass divided with volume.
The density of a pure material has the same numeric values just like its mass concentration. Various materials have varied densities, and density can be important in terms of buoyancy, purity, and packing.
D=m/v
=350/95
=3.684g/cm³
The object will sink in water
Therefore, 3.684g/cm³ is the density of an object that has a mass of 350 g and a volume of 95 cm³. The object will sink in water.
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If I have 3.0 L of a gas at a pressure of 500kPa and a temperature of 50C and I decrease the pressure to 240 kPa and the temperature to 103K what will be the new volume
Answer:
The new volume is 1.993 L
Explanation:
The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature and moles.
Boyle's law says that the volume occupied by a certain gaseous mass at constant temperature is inversely proportional to the pressure. This law is expressed mathematically as:
P*V=k
Gay-Lussac's law indicates that, as long as the volume of the container containing the gas is constant, as the temperature increases, the gas molecules move faster. Then the number of collisions with the walls increases, that is, the pressure increases. That is, the pressure of the gas is directly proportional to its temperature. This law indicates mathematically that the quotient between pressure and temperature is constant:
[tex]\frac{P}{T}=k[/tex]
Finally, Charles's law indicates that as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T}=k[/tex]
Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:
[tex]\frac{P*V}{T}=k[/tex]
Analyzing an initial state 1 and a final state 2, it is satisfied:
[tex]\frac{P1*V1}{T1}=\frac{P2*V2}{T2}[/tex]
In this case:
P1= 500 kPaV1= 3 LT1= 50 C= 323 K (being 0 C= 273 K)P2= 240 kPaV2= ?T2= 103 KReplacing:
[tex]\frac{500 kPa*3 L}{323 K}=\frac{240 kPa*V2}{103 K}[/tex]
Solving:
[tex]V2=\frac{103 K}{240 kPa} *\frac{500 kPa*3 L}{323 K}[/tex]
V2=1.993 L
The new volume is 1.993 L
An apple hanging from a tree 3 m high has a potential energy of 6 J. What is
the mass of the apple?
Answer:
m= 0.20 Kg
Explanation:
Given: F = 6 J, a = 3 m
To find: What is the mass of the apple?
Formula: [tex]m=\frac{2KE}{v^2}[/tex]
Solution: Newtons are derived units, equal to 1 kg-m/s². In other words, a single Newton is equal to the force needed to accelerate one kilogram one meter per second squared.
M = F ÷ a
F = 6 kg ÷ 3 m/s2
F = 2 N
PE = mgh 6 J= (3m) (9.8 m/s2²) (__m) m= 0.20 Kg
KClO3 + H2SO4 ⇒ HClO4 + ClO2 + K2SO4 + H2O
is there a way to balance this?
Answer:
6KClO3 + 3H2SO4 → 2HClO4 + 4ClO2 + 3K2SO4 + 2H2O
Explanation:
It's a bit long because you will keep changing the coefficient to match both side.
During a lab, a student holds a magnesium ribbon in a flame. Which of the following is the magnesium ribbon considered?
A. Molecule
B.Compound
C.Element
D.Mixture
13 : 22
MI SEC
23. Which of the following solutions will reach dynamic equilibrium?
a Supersaturated solution
b Unsaturated solution
C Saturated solution
d None of the above
Answer:
C
Explanation:
The solution that will reach dynamic equilibrium is a saturated solution. The correct option is C.
What is an unsaturated solution?A chemical solution in which the solute concentration is less than its equilibrium solubility is known as an unsaturated solution.
The solvent dissolves the entire solute.
When a solute (typically a solid) is mixed with a solvent (commonly a liquid), two reactions take place at the same time.
Thus, the correct option is C, the saturated solution.
Learn more about saturated solutions.
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The 2 in the formula AgS is a
1. coeffcient
2. subscript
3. superscript
4. binomial
Answer:
Subscript, or B
Explanation:
AgS is the equation for the chemic reaction of Silver + Sulfur, since the subscript of 2 goes by the g in the equation, this would equal subscript.
Remember subscripts are located at the BOTTOM of a coefficient and superscripts are located at the TOP of a coefficient.
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what method is used to separate smoke particles from air
THIS IS ALSO PAST DUE PLEASE ANYONE HELP BRINLIEST GIVEN
Explain how limiting growth is advantageous for the goldfish’s survival in a home aquarium
Answer:
I dont know what ur answers are but mine are option a and b fish will not out grow the tank and Concentration of waste in the water does NOT become harmful to the fish.
Explanation:
If 36g of Al react with 34L of Oz, how many moles of Al2O3 are produced?
4Al +302 --> 2Al2O3
145 moles
0.667 moles
0.165 moles
101 moles
Answer:
.........................................................................................................................................................................................................................................................................................................................................................................................................................................................
Explanation:
If 36g of Al react with 34L of Oz, 0.667 moles of Al2O3 are produced. The correct option is b, 0.667 moles
What are moles?The mole is a SI unit of measurement that is used to calculate the quantity of any substance.
[tex]\rm 4Al +3O_2 -- > 2Al_2O_3[/tex]
Step1- calculate the moles of aluminum
The mass of Al is 36 g
The molar mass of Al is 27
[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\rm Number\;of \;moles\;of\;Al = \dfrac{36}{27} = 1.33\;mol[/tex]
Step2- calculate the moles of oxygen
The mass of O₂ is 34 L
[tex]\rm 1 L = \dfrac{1}{22.4 }[/tex]
[tex]\rm Number\;of \;moles\;O_2= \dfrac{34}{22.4} = 1.51[/tex]
The limiting reagent is 1.33 MOL. By the rule of stoichiometry, four moles of Al produced 2 moles of Al.
[tex]\rm \dfrac{1.33}{2} = 0.665 \;moles[/tex]
Thus, the correct option is b. 0.667 moles.
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