Answer:
Final temperature = 489.17°C
Explanation:
Given - A 4.70 g nugget of pure gold absorbed 279 J of heat. The initial temperature was 29.0°C.
To find - What was the final temperature ?
Proof -
Given that,
q = 279 J
m = 4.70 g
We know that, C = 0.129 J
Also,
We know the specific heat equation that,
q = m(ΔT)C
⇒ΔT = q ÷ mc
= 279 ÷ (4.70)(0.129)
= 279 ÷ 0.6063
= 460.17°C
⇒ΔT = 460.17°C
Now,
We know that,
Change in Temperature is the difference of final and initial Temperature
So,
ΔT = Final temp. - Initial Temp.
⇒460.17°C = Final Temp. - 29.0°C
⇒Final temperature = 460.17°C + 29.0°C
= 489.17°C
⇒Final temperature = 489.17°C
What makes lava flow in the manner that it does
Answer:
Lava flows are streams of molten rock that pour or ooze from an erupting vent. Lava is erupted during either nonexplosive activity or explosive lava fountains. ... But when basalt lava flows are confined within a channel or lava tube on a steep slope, the main body of the flow can reach velocities >30 km/h (19 mph).
Explanation:
A container of oxygen with a volume of 60 L is heated from 300 K to 400 k, What is the new volume?
Answer:
80L
Explanation:
V1/T1 = V2/T2
V2 = V1 T2/T1
T1 = 300K
V1 = 60L
T2 = 400K
V2 = ?
V2 = V1 T2/T1
V2 = (60L)(400K) / (300K)
V2 = 80L
why is mn2+ more stable than mn3+
Answer:
See Explanation
Explanation:
Let us closely consider the electronic configuration of manganese atom, Manganese II ion and manganese III ion. This will give a clue of the answer.
Manganese: [Ar] 3d5 4s2
Manganese II: [Ar] 3d5
Manganese III: [Ar] 3d4
Now, let us remember that the d orbital contains a maximum of ten electrons. Hence, the electronic configuration of Mn^2+, [Ar] 3d5 reflects a half filled d- orbital which is known to be unusually stable(half-filled orbitals are known to possess unusual stability just as fully filled orbitals do).
The same can not be said about Mn^3+. Hence, Mn^2+ is more stable than Mn^3+.
Which description is true of earth’s four layers?
Answer:
The astenosphere is located below the lithosphere
The mantle is composed of silicate material
Explanation:
The Earth has several different layers, and they can be presented in two different manners, depending on their chemical composition and their physical properties. According to the chemical composition the Earth has three layers, crust, mantle, and core, while in accordance to the physical properties it has five, lithosphere, astenosphere, mesosphere, outer core, and inner core.
The astenosphere is the second layer from the top, and it lies just below the lithosphere. It is also the upper part of the mantle. The mantle is a layer that is largely composed of silicate material, mostly silicate molten rock. It can easily be seen from the volcanic activities that this layer is composed of silicate material because the magma is rich in it, and the magma comes from this layer.
Which wave is used to identify the heat given off by distant objects in space
Which of the following elements has the largest atomic number?
cobalt, Co
O titanium, Ti
scandium, SC
nickel, Ni
Answer:
O titanium, Ti
Explanation:
calculate the volume occupied by 6.4g of oxygen, 02 at stp?,
Answer:
4.9 L O₂
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesSTP (Standard Conditions for Temperature and Pressure) = 22.4 L per mole at 1 atm, 273 KStoichiometry
Using Dimensional AnalysisExplanation:
Step 1: Define
Identify variables
[Given] 6.4 g O₂ at STP
[Solve] L O₂
Step 2: Identify Conversions
[STP] 1 mol = 22.4 L
[PT] Molar Mass of O: 16.00 g/mol
Molar Mass of O₂: 2(16.00) = 32.00 g/mol
Step 3: Convert
[DA] Set up: [tex]\displaystyle 6.4 \ g \ O_2(\frac{1 \ mol \ O_2}{32.00 \ g \ O_2})(\frac{22.4 \ L \ O_2}{1 \ mol \ O_2})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 4.48 \ L \ O_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
4.48 L O₂ ≈ 4.9 L O₂
State the trend in chemical reactivity as we go down the group for Group I elements Account for
this trend using the electronic structures of the elements.
Answer: The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.
Determine how many grams of precipitate (solid) will form when 621 g of magnesium
chloride react with excess silver nitrate in the reaction
2 AgNO3(aq) + MgCl(aq) - 2 AgCl(s) + Mg(NO3)2(aq)
NB: Convert to moles, then use your preferred method to get moles AgCl produced
from the given moles of MgCl, then convert moles AgCl produced to grams AgCI.
Answer:
2,981g
Explanation:
Firstly, we need to find the number of moles of MgCl that we have by using the formula: mass = No. Moles x Molar Mass, which we can rearrange so that we are solving for no. moles:
No. Moles = mass / Molar Mass
We are given a mass of 621g, and we can calculate the molar mass of MgCl by adding the two molar masses together: 24.31+35.45 = 59.76
Now we can calculate number of moles by substituting these values into the formula:
n = 621 / 59.76
No. moles = 10.4
Now we can use the co-efficients in the formula to tell us how many moles of AgCl will be formed. The coefficient of MgCl is 1, and the coefficient of AgCl is 2. This means that every 1 mol of MgCl will form 2 moles of AgCl. So, to find the no. moles of AgCl, we multiply our no. moles by 2:
10.4 x 2 = 20.8 moles
Finally we convert this back into mass by multiplying the no. moles by the Molar mass of AgCl:
m = 20.8 x (107.87+35.45)
m = 2,981g
Please I need this before 11:59am it’s for my final test: Balance the equation *COMPLETE WITH PROCEDURE*
Answer:
okkkkk
Explanation:
the balanced equation is
2NaBr +Cl2 =2NaCl + Br2
can you mark me as a brainliest
Which example in the video is a physical change?
A) Burning steel wool
B) Mixing chemicals
C) Rusting nail
D) Melting ice cream
D melting ice cream because if u know what a physical change is its a change that you can reverse chimical change are changes you cant reverse so u can freeze back ice cream so :D
How many moles of argon would you have if you have 25 L of argon?
Answer: 39.948 grams
Explanation:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Argon, or 39.948 grams
When there is an increase in temperature of a gas in an
enclosed container, the pressure will also increase due to the:
Answer:increase In kinetic energy of molecules
Explanation:increase in kinetic energy of molecules
When there is an increase in temperature of a gas in an enclosed container, the pressure will also increase due to the increase in the kinetic energy.
What is the relation between temperature and pressure?Temperature and pressure of gas is directly proportional to each other.
When the temperature of the gas increases, then the kinetic energy of the gas molecules are also increases. Due to increase in the velocity of gas molecules they will collide with each other as a result of which pressure of the gas is aslo increases.
Hence due to increase in kinetic energy, pressure increases.
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At what temperature will uranium hexafluoride , the densest gas known have the same average speed as a molecule of the lightest gas, hydrogen at 37 degree celcius
Answer:
the required temperature of uranium hexafluoride is 54156.25 K
Explanation:
Given the data in the question;
We know that average speed is;
u = [tex][ 3RT / MM ]^{1/2[/tex] ----------- let this be equation 1
where MM is the molar mass
T is temperature
R is universal gas constant and u is the average speed.
First we get the average speed of H₂
[tex]U_{H}[/tex]₂ = [tex][ 3RT_H_2 / MM_H_2 ]^{1/2[/tex] ------ let this be equation 2
Next is the average speed of UF₆
[tex]U_{UF[/tex]₆ = [tex][ 3RT_{UF_6} / MM_{UF_6} ]^{1/2[/tex] ------ let this be equation 3
given that; both have the same average speed, equation 2 = equation 3;
[tex][ 3RT_H_2 / MM_H_2 ]^{1/2[/tex] = [tex][ 3RT_{UF_6} / MM_{UF_6} ]^{1/2[/tex]
we multiply both sides by 1/3R and also square both sides.
[tex][ T_H_2 / MM_H_2 ][/tex] = [tex][ T_{UF_6} / MM_{UF_6} ][/tex]
given that; temperature of hydrogen T[tex]_{H[/tex]₂ = 37°C = ( 37 + 273.15)K = 310.15 K
we know that Molar mass of H₂; MM[tex]_{H[/tex]₂ = 2.016 g/mol
and molar mass of UF₆; MM[tex]_{UF[/tex]₆ = 352.02 g/mol
so we substitute
[ 310.15 K / 2.016 g/mol ] = [ T[tex]_{UF[/tex]₆ / 352.02 g/mol ]
T[tex]_{UF[/tex]₆ = [ 352.02 g/mol × 310.15 K ] / 2.016 g/mol
T[tex]_{UF[/tex]₆ = 109179.003 K/ 2.016
T[tex]_{UF[/tex]₆ = 54156.25 K
Therefore, the required temperature of uranium hexafluoride is 54156.25 K
Why is carbon dioxide a covalent bond?
Explanation:
One atom of carbon (2.4) combines with two atoms of oxygen (2.6) to form the compound carbon dioxide CO2 (only the outer shell of carbon's electrons are shown). ... The carbon dioxide molecule is held together by the strong C=O. carbon–oxygen double covalent bonds by sharing electrons.
What is the limiting reactant and what is the maximum mass of aluminum hydride that can be formed given 3.00 grams of hydrogen and 26.00 grams of aluminum ?
Answer:
Limiting Reagent = Aluminum
Mass formed = 28.92g (4.s.f.)
Explanation:
Step 1: Write a balanced equation for the reaction
We know that Aluminum hydride is formed from hydrogen and aluminum, so we can put those elements in our equation first:
H2 + Al -> AlH3
*Remember that hydrogen is a diatomic molecule so it is H2.
Now let's balance it! We can see that the Al molecules are balanced but the Hydrogens are not, so we can multiply both molecules by the opposite number:
3H2 + Al -> 2AlH3
Now we have 6 hydrogens on each side, we just add a 2 to balance the aluminum and we have the balanced equation!
3H2 + 2Al -> 2AlH3
Step 2: Convert all values to no. of moles
To do this, we can use the formula:
mass = no. moles x Molar mass
Which we can rearrange to find No. moles = mass/ Molar mass
Hydrogen: 3.00/2.02 = 1.49 moles
Aluminum: 26.00/26.98 = 0.9637 moles
Step 3: Find the Limiting Reagent
Now we choose one (let's use hydrogen) and divide by the co-efficient ratio between the two elements (3H2 for every 2 Al).
1.49 x 2/3 = 0.993 (This is the theoretical amount of Aluminum we need for the amount of hydrogen we have)
Now we compare this number with the actual no. moles of aluminum we have to find the limiting reagent:
0.993 > 0.9637
This means that Aluminum is the limiting reagent. (We are working with 0.9637 moles of Aluminum.)
Step 4: Find amount of product formed
We can use the molar ratio of the balanced equation again to find how much AlH3 is made. The coefficient of Al is the same as the coefficient of AlH3. This means that equal no. if moles are made in the reaction.
This means that 0.9637 moles of Aluminum Hydride is formed in this reaction.
Step 5: Convert back to mass in grams
Now we just need to convert the no. moles back to mass using the same formula:
mass = no. moles x Molar Mass
m = 0.9637 x (26.98 + 3 x 1.01)
m = 0.9637 x 30.01
m = 28.92g (4.s.f.)
Hope this helped!
Which of the following is NOT a postulate of the Kinetic Molecular Theory?
1. Average Kinetic Energy of the system is a measure of the temperature of the system.
2. Energy is conserved in the collisions between gas molecules..
3. Energy can either be destroyed or created. Its goes from one form to another.
4. Gases travel in straight line until they collide with other gas molecules
Answer:
"3. Energy can either be destroyed or created. Its goes from one form to another."
Explanation:
The third answer choice, "3. Energy can either be destroyed or created. Its goes from one form to another. " is related to the Law of Conservation of Energy from thermodynamics. Is it not a postulate of the Kinetic Molecular Theory.
"1. Average Kinetic Energy of the system is a measure of the temperature of the system."
Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]
The average kinetic energy of the system is measured by its temperature and nothing else"2. Energy is conserved in the collisions between gas molecules.."
Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]
All collisions between gas molecules are perfectly elastic, meaning no energy is lost"3. Energy can either be destroyed or created. Its goes from one form to another.
[tex]\times[/tex] NOT a Postulate of Kinetic Molecular Theory
Related to Conservation of Energy from thermodynamics"4. Gases travel in straight line until they collide with other gas molecules"
Postulate of Kinetic Molecular Theory [tex]\checkmark[/tex]
All gas molecules will travel in a straight line until they collide with other gas molecules or some object (e.g. a container)in your notebook,write the appropriate tempo for the following actions.Then demostrate the actions then,demostrate the action in front of your parents,guardian
Answer:
cell :—
•They lack a well-defined nucleus, have a nucleoid instead.
•Usually have double-stranded, circular DNA.
•Do not have mitochondria.
Eukaryotic cell :—
•Have a well-defined nucleus enclosed in the nuclear membrane.
•Have a linear double-stranded nucleus.
•Mitochondria are present.
WHO KNOWS HOW TO DO THISSS NEED HELP RN PLS
Li PO4 + AlF →
Explanation:
Your chemical equation should look like this:
Li3PO4 + AlF3 --> 3LiF + AlPO4
This is the balanced equation for a double-displacement reaction
The pH of a solution is 8. Some hydrochloric acid is added to the solution. Suggest the pH of the solution after mixing. pH=.......??
Answer:
Probably around 6 because the ph of hydrochloric acid is 3
Explanation:
The molar mass of Cu2CO3 is
a. 123.5 g/mol b. 155.0 g/mol
c. 187.0 g/mol
d. 211.0 g/mol
Answer:
a because it has a 2 and 3 in ot like it says in the question
What speed covers 20 miles in 25 mins?
Answer:
48 mph
Explanation:
divide time by distance - 20/25 = .8 miles per minute, multiple by 60 to get mph
In a reacting flask, 500 cm3 hydrogen is mixed with 500 cm3 oxygen and is ignited. (a) Which reactant is the limiting reagent? (b) Calculate the mass of water formed.
Answer:
See Explanation
Explanation:
From Gay-Lussac's law of combining volumes;
Equation of the reaction; 2H2(g) + O2(g) -------> 2H2O(g)
Ratio of volumes; 2 : 1 : 2
Initial volumes; 500cm^3 500cm^3 0 cm^3
Reacting volumes; 500cm^3 250cm^3 500cm^3
Final Volumes; 0 cm^3 250 cm^3 500 cm^3
We can easily see from the table that the limiting reactant is oxygen.
Hence, the mass of water formed is obtained from;
1 mole of gaseous water occupies 22400 cm^3
x moles of water occupies 500cm^3
x = 500cm^3 * 1 mole/22400 cm^3
x = 0.022 moles of water
Mass of water = 0.022 moles of water * 18 g/mol
Mass of water = 0.396 g
What is the mole to mole ratio of oxygen to water for the equation below?
C7H16 + 11 O2 -> 7 CO2 + 8 H2O
a. 11:8
b. 8:11
c. 1:11
d. 11:1
Answer:
A
Explanation:
because
O2 : H2O
11 : 8
hope this helps:)
The mole to mole ratio of oxygen to water for the chemical equation given is 11:8.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.
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8. Which of the following is not considered to be a unicellular organism? O A. Flea O B. Euglena C. Amoeba O D. Paramecium
balance the equation xcl2(aq)+agno3(aq)=x(no3)2(aq)+agcl(s)
Explanation:
[tex]XCl _{2(aq)} + 2AgNO _{3(aq)}→X(NO _{3}) _{2(aq)} +2 AgCl _{(s)}[/tex]
Answer:
[tex]XCl2(aq) + 2AgNO3(aq) --------> X(NO3)2(aq) + 2AgCl(s)[/tex]
Explanation:
The rule guiding he balancing of reaction equations is that the number of atoms of each element on both sides of the reaction equation must be the same.
In order to balance this equation, this rule must be applied. The balanced reaction equation therefore becomes;
XCl2(aq) + 2AgNO3(aq) --------> X(NO3)2(aq) + 2AgCl(s)
We can see by conducting an atom count that the number of atoms of each element on both sides of reaction equation is the same hence the equation is balanced.
Name the following compound
A student wants to reclaim the iron from an 18.0 gram sample of iron (III) oxide, which occurs according to the reaction below: how many grams of iron can be reclaimed.
Answer:
12.6 g
Explanation:
Step 1: Write the balanced decomposition reaction
2 Fe₂O₃ ⇒ 4 Fe + 3 O₂
Step 2: Calculate the moles corresponding to 18.0 g of Fe₂O₃
The molar mass of Fe₂O₃ is 159.69 g/mol.
18.0 g × 1 mol/159.69 g = 0.113 mol
Step 3: Calculate the moles of Fe formed from 0.113 moles of Fe₂O₃
The molar ratio of Fe₂O₃ to Fe is 2:4. The moles of Fe formed are 4/2 × 0.113 mol = 0.226 mol
Step 4: Calculate the mass corresponding to 0.226 moles of Fe
The molar mass of Fe is 55.85 g/mol.
0.226 mol × 55.85 g/mol = 12.6 g
Consider this reaction and answer the questions:
Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.
What is the oxidation number of chlorine in the reactant state?
What is the oxidation number of oxygen in the reactant state?
What is the oxidation number of potassium in the reactant state?
What is the oxidation number of chlorine in the product state?
What is the oxidation number of oxygen in the product state?
What is the oxidation number of potassium in the product state?
Balanced chemical reaction: 2KClO₃ → 2KCl + 3O₂.
Potassium is metal from first group of Periodic table of elements, it has always oxidation number in compound +1.
Chlorine in the reactant state has oxidation number +5 (+1 + x + 3 · (-2) = 0) and it is reduced to -1 (+1 + x = 0) in the product state.
Oxygen in the reactant state has oxidation number -2 (+1 + 5 + 3 · x = 0) and it is oxidized to 0 (in molecule of oxygen) in the product state.
Consider this reaction and answer the questions:
Upper K upper C l upper O subscript 3 right arrow upper K upper C l plus upper O subscript 2.
What is the oxidation number of chlorine in the reactant state?
+5
What is the oxidation number of oxygen in the reactant state?
-2
What is the oxidation number of potassium in the reactant state?
+1
What is the oxidation number of chlorine in the product state?
-1
What is the oxidation number of oxygen in the product state?
0
What is the oxidation number of potassium in the product state?
+1
How do movements and interactions of air masses cause change in the weather?