If a container is placed on a hot plate, the kinetic energy of molecules inside the container will increase.
It is a fundamental theory of thermodynamics that energy cannot be produced and neither be destroyed. So obviously from the fundamental theorem of thermodynamics, the first two options in the given question ( some kinetic energy would be produced and some kinetic energy would be destroyed ) are obviously wrong.
Since the container is placed on a hot plate, the heat energy will get transferred from the plate to the container, and hence the molecules inside the container will get heated and excited. Therefore the kinetic energy of molecules inside the container will increase.
So basically, in this case, the heat energy of the plate is converted to the kinetic energy of molecules inside the container.
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Help me please........
Answer:
2KNO3 + Na --> 2KO2 + NaO2 + N2
Explanation:
on the left side there is 1 Nitrogen molecule, but on the right side there are 2.
So, by adding a coefficient of 2 on the left side the N balances out.
Then, the K's aren't balanced anymore. There are 2 K on the left and 1 K on the right.
So, if a coefficient of 2 is added to KO2 on the left, the K is then balanced.
Now check all the other molecules, and everything else is balanced!
On both sides there are 2 K's, 2 N's, 6 O's, 1 Na.
can someone help me ??
Answer:
6)B.C,Ge,Pb,Si
7)A.Be,Mg,Sr
8)D.arsenic,calcium
9)B.Group 13,period 3
How many Faraday is needed to deposit 0.2 g of Calcium (Ca) from CaCl2 solution using electrolysis process.
Answer:
0.01 faraday
Explanation:
We'll begin by writing the balanced equation. This is illustrated below:
CaCl₂ (aq) —> Ca²⁺ (aq) + 2Cl¯ (aq)
Ca²⁺ (aq) + 2e —> Ca
Molar mass of Ca = 40 g/mol
Mass of Ca from the balanced equation = 1 × 40 = 40 g
1 mole of electron (e) = 1 faraday
2 moles of electrons (e) = 2 × 1 faraday
2 moles of electrons (e) = 2 faraday
From the balanced equation above,
40 g of Ca was deposited by 2 faraday.
Therefore, 0.2 g of Ca will be deposited by = (0.2 × 2)/40 = 0.01 faraday.
Thus, 0.01 faraday is needed for the reaction.
Number 8
in metals, reactivity increases ____ across a period, and in non metals reactivity increases ____ across a period.
A. to the left,to the left
B. to the left, to the right
C. to the right , to the left
D. to the right, to the right
help? It would honestly mean a lot :(
Answer:
1 1
5 2
6 1
8 3
10 3
6 3
9 3
13 3
Explanation:
First of you add the subscripts (the little numbers after the letters) and multiply the big numbers before the letters together to get the number of atoms
For Example:
O= 1 atom
Si{2}= 2 atoms
Mg{5}C{6}= 11 atoms
3Na{2}= 6 atoms
O(SiNa){2}= OSi{2}Na{2}= 5 atoms
Each Capital letter is a new Element
For Example:
O = 1 Element
NaSi = 2 Elements
If the mass of a box is 140 g, and the volume is 8 cm3, then the density of the box = ?
Answer:
mass matter
Explanation:
2 HNO3(aq) + NO(g) → 3 NO2(g) + H2O(l) ΔG°rxn = ? ΔG°f (kJ/mol) -110.9 87.6 51.3 -237.1
Answer:
[tex]\Delta G_{rxn}=51.0kJ/mol[/tex]
Explanation:
Hello there!
In this case, according to the definition of the Gibbs free energy of reaction in terms of the Gibbs free energy of formation of the involved reactants and products, it is possible for us to compute it as shown below:
[tex]\Delta G_{rxn}=3\Delta _f G_{NO_2}+\Delta _f G_{H_2O}-2\Delta _f G_{HNO_3}-\Delta _f G_{NO}[/tex]
Thus, by plugging in the given data, it is possible to obtain:
[tex]\Delta G_{rxn}=3(51.3)+(-237.1)-2(-110.9)-(87.6)\\\\\Delta G_{rxn}=51.0kJ/mol[/tex]
Best regards!
The standard Gibbs free energy change (ΔG°rxn) for the reaction is 76.7 kJ/mol.
The balanced equation for the reaction is:
2 HNO₃(aq) + NO(g) → 3 NO₂(g) + H₂O(l)
The standard free energy change for a reaction ( ΔG0rxn) can be found out using the equation,
ΔG° = Σ ΔG°fproducts - Σ ΔGf° reactants
ΔG°rxn = ΔH°rxn - TΔS0rxn
∆H°rxn = change in enthalpy of reaction
∆S° = Change in entropy of reaction
T = Temperature ( 298 K )
ΔG°rxn = (3 × ΔG°f(NO₂(g)) + ΔG°f(H₂O(l))) - (2 × ΔG°f(HNO₃)aq)) + ΔG°f(NO(g)))
Substituting the given ΔG°f values:
ΔG°rxn = (3 × 51.3 kJ/mol) + (-237.1 kJ/mol) - (2 × (-110.9 kJ/mol)) + (87.6 kJ/mol)
ΔG°rxn = 153.9 kJ/mol - 237.1 kJ/mol + 221.8 kJ/mol + 87.6 kJ/mol
ΔG°rxn = 226.2 kJ/mol - 149.5 kJ/mol
ΔG°rxn = 76.7 kJ/mol
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Aluminum has a specific heat of 0.900 J/g.°C. Lead has a specific
heat of 0.13 J/g.°C. If equal masses of both metals are heated to
100°C, which metal will absorb the most energy?
Answer:
???
Explanation:
How many atoms are there in 8.80 moles magnesium chloride? (write your answer in scientific notation).
Answer:
There are 5.30*10²⁴ atoms in 8.80 moles magnesium chloride.
Explanation:
Avogadro's Number is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension. Avogadro's number applies to any substance.
Then you can apply the following rule of three: if 1 mole of magnesium chloride contains 6.023*10²³ atoms, 8.80 moles of magnesium chloride contain how many moles of atoms?
[tex]amount of atoms=\frac{8.80 moles* 6.023*10^{23} atoms }{1 mole}[/tex]
amount of atoms= 5.30*10²⁴
There are 5.30*10²⁴ atoms in 8.80 moles magnesium chloride.
 why don't we ever see solid or liquid oxygen on earth?
Halogens tend to form anions because A) losing electrons will fill their octet faster than gaining them. B) gaining electrons will fill their octet faster than losing them. C) halogen element ionization energies are lower than transition metal ionization energies. D) halogen atomic radii tend to be larger than their corresponding ionic radii. E) halogen atomic radii tend to be smaller than their corresponding ionic radii.
Answer:
The correct answer is - B) gaining electrons will fill their octet faster than losing them.
Explanation:
Halogens are located in the 17 th group in the periodic table and have elements like fluorine, chlorine bromine and others. All these elements are nonmetals and have similar electron numbers in their octet.
That is the reason of their high effective nuclear charge as they are electronegative and therefore readily get electrons to become anion with other elemnts in chemical reaction. These elements make anion formed when a nonmetal atom gains one or more electrons.
Inferring Relationships Most earthquakes take
place near tectonic plate boundaries. Based on the
hazard levels, where do you think a boundary between
two tectonic plates is bcated in the United States?
Answer:
california
Explanation:
a geologist finds fossils in rocks that are older than the fossils and rocks of each layer beneath them what causes this situation
a. uplift
b.overturning of sedimentary rocks
c.intrusion of igneous rocks
d.seafloor spreading
e.subduction
Write the steps for calculating molar mass.
Answer:
Explanation:
1) Find number of each of the type of atom that is present in the compound, using the chemical formula .
2) Then multiply number of atoms of each element that is present in the compound with the atomic weight of each of the element
3) Add everything together and add the units (grams/mole ) after the number
Let finds that of water
Chemical formula of water is (H20 )
hydogens atoms= 2
oxygen atom= 1
Atomic weight for Hydrogen= 1
Atomic weight for Oxygen= 16
Total number of atoms of Hydrogen from the formula (H2O)= 2
Total number of atoms of Oxygen from the formula (H2O)= 1
the molar mass=
Hydrogen: ( 2 x 1)= 2
Oxygen: ( 1 x 16)= 16
Add together= (16+2)
= 18
Then add the unit, we have(18 g/mol.)
What is the molarity of a solution prepared by dissolving 198 g of BaBr2 in 2.00 liters of solution?
Answer:
The molarity of the solution is 0.335 [tex]\frac{moles}{liter}[/tex]
Explanation:
Molar concentration is a measure of the concentration of a solute in a solution, be it some molecular, ionic, or atomic species.
Molarity is the number of moles of solute that are dissolved in a certain volume and is calculated by:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
Being the molar mass of BaBr2 equal to 297.14 g/mole, that is to say that 1 mole contains 297.14 grams, the mass of 198 grams are contained in:
[tex]198 grams*\frac{1 mole}{297.14 grams} = 0.67 moles[/tex]
So:
number of moles of solute= 0.67 molesvolume= 2 LReplacing in the definition of molarity:
[tex]Molarity=\frac{0.67 moles}{2 L}[/tex]
Solving:
Molarity= 0.335 [tex]\frac{moles}{liter}[/tex]
The molarity of the solution is 0.335 [tex]\frac{moles}{liter}[/tex]
consider the following reaction: 2Al + 6HBr --> 2AlBr3 + 3H2
A) when 3.22 miles of Al reacts with 4.96 miles of HBr3, how many moles of H2 are formed
B) what is the limiting reactant
i find the answer in (Limiting Reactants and Excess ws_KEY.pdf)
make a search for it it's the first link
According to stoichiometry and balanced chemical equation, 6.18 moles of hydrogen are formed and HBr is the limiting reactant.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is used in balancing chemical equations.
In the given chemical reaction,when 3.22 moles of Al reacts with 4.96 moles of HBr₃ total of 3.22+4.96= 8.18 moles are formed.Out of which according to reaction of which 6 moles are of hydrogen so thus,to find moles of hydrogen formed 8.18-2=6.18 moles of hydrogen are formed.
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What does the charge tell you about an atom?
Brainliest!!!!!!
Answer:
The charge will tell you if the atom is neutral, positive, or negative. "The charge of an atom is the number of protons minus the number of electrons."
What is the molarity of a solution made with 87g of Mgo dissolved in enough water to make
800mL of solution?
Answer:
2.70 M.
Explanation:
Molar mass of MgO = 24.3 + 16 = 40.3.
A molar solution will contain 40.3g in 1 Litre.
So 800 mL of 1 molar solution will contain 0.8* 40.3 g MgO.
So the molarity of the given solution
= 87 / (0.8*40.3)
= 2.699 M.
Select the correct answer.
Which of the following is the Arrhenius equation?
A.
K=AeEa/RT
B.
K = -AeEa/RT
c.
K = Ae-Ea/RT
D.
K = -Ae-Ea/RT
Answer:
The answer is C
Explanation:
How many km are in 1.29 x 10 ^-2 cm?
can someone pls help me
Answer: 0.0129
Explanation:
In the future what two planets will earth resemble?
Answer:
Venus and Mars?
Explanation:
Tides are caused by gravitational interactions between the earth, sun and moon? true or false
Answer: FALSE
Tides and Water Levels
Gravity is one major force that creates tides. In 1687, Sir Isaac Newton explained that ocean tides result from the gravitational attraction of the sun and moon on the oceans of the earth (Sumich, J.L., 1996). ... Our sun is 27 million times larger than our moon.
HOPE THIS HELPS
If an
object is slowing down, the velocity will be
positive
zero
negative
constant
Answer:
I'm not 100% sure but I think it would be constant
Answer:
The object is moving in the negative direction!
Explanation:The object has a negative velocity) and is speeding up.
what is the difference between quantative and qualitative analysis
Answer:
I guess quantitative data is countable or measurable, relating to numbers; qualitative data is descriptive, relating to words. Quantitative data lends itself to statistical analysis; qualitative data is grouped and categorized according to themes.
Explanation:
Answer:
quantitative - actual numbers as data
Qualitative- uses senses (taste, touch, etc.)
Explanation:
Y’all I need help ASAP
What are the correct numbers to balance this equation......?
__NaCI2+__Col2——> __Nal2+__CoCI2
Answers:
1)not possible to balance
2) 2...2—>...2...2
3) 3...3—>...3...3
4)it’s already balanced.
Answer:
yes it is already balanced
just a tricky question!!
Explanation:
What factor determines whether an acid or base is strong or weak?
A)The number of hydroxide ions.
B)The number of hydronium ions.
C)The extent to which the acid or base ionizes.
Answer:
i think it's c
Explanation:
Calculate the pOH and the pH of a 5.0 x 10-2 M solution of NaOH.
Answer:
pOH = 1.3, pH = 12.7
Explanation:
Since NaOH is a strong base, it will completely ionize; further, since it completely ionizes, our hydroxide concentration (a product of the ionization) will be the same as the given concentration of NaOH.
NaOH -> Na⁺ + OH⁻, [OH⁻] = 5.0 x 10^-2 M
pOH is the negative log of the hydroxide concentration, so plug our hydroxide concentration in:
pOH = -log[OH⁻] = -log[5.0 x 10^-2 M] = 1.3
Since pH + pOH = 14, we can plug in pOH and solve for pH:
pH + 1.3 = 14
pH = 14 - 1.3 = 12.7
Thus, our pOH = 1.3 and pH = 12.7.
What is the formula for pH?
Answer:
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].
Example: Find the pH of a 0.0025 M HCl solution.
NaOH + HCI → NaCl + H20
*double replacement
*single replacement
*synthesis
*combustion
Answer: a double replacement
Explanation:
WIll give brainliest! : In the following Punnett square, what is the phenotypic percentages of the offspring? From dwarfism slideshow - length of legs.
Answer:
75% will have long legs and 25% will have short legs
Explanation: