and identify the type
of reaction
Fe2O4 + Al → A1,03 + Fe
The missing components in the table to the right are indicated with orange letters. use the periodic table and the tools bar to fill in the corresponding values.
a
b
c
d
Answer:
A: 349.0
B: 3.16
C: 1.31
D: 0.93
Explanation:
The missing components in the table to the right are indicated with orange letters. By using the periodic table and the tools bar corresponding values are (A) 349 (B) 3.16 (C) 1.31 and (D) 0.93.
What is Electron Affinity ?The electron affinity of an atom or molecule is defined as a energy released when electrons added to outermost shell. Electron affinity increases from left to right across a period.
What is Electronegativity ?Electronegativity is defined as the tendency of atom attract the bonded pair of electrons of covalent bond to itself. To measure the electronegativity Pauling scale is used.
The electron affinity value of chlorine is 349 (kJ/mol). The electronegativity value of chlorine is 3.16. The electronegativity value of magnesium is 1.31. The electronegativity value of Sodium is 0.93.
Thus from the above conclusion we can say that The missing components in the table to the right are indicated with orange letters. By using the periodic table and the tools bar corresponding values are (A) 349 (B) 3.16 (C) 1.31 and (D) 0.93.
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How many moles are in an iron nail that has a mass of 4.58 grams?
Answer:
24.6
Explanation:
Answer:
There are 0.81 moles in an iron nail having mass of 4.58 grams..
WILL GIVE BRAINLYEST!!!!!The number at the bottom of Silicon on the periodic table is 28.086. This number is the element's _____________.
silicon
14
SI
28.086
Question 10 options:
atomic weight
symbol
atomic number
electron number
Answer:
atomic weight
Explanation:
its atomic weight becuase if it a number on the peroidic table its going to be the atomic weight
Suppose you prepare 1.00 L of an aqueous solution containing 1.00 mol Na2CO3. What is the concentration of the Na ion in the solution
Answer:
69
Explanation:
Which weighs more, 5.25 g of gold or 525 mg of gold?
A. 5.25 g
B. 525 mg
Answer:
A) is best answer and would be 5250mg
Explanation:
Convert 38 kilometers to meters
Answer: 38 km = 38000 meters
Explanation:
1 km = 1000 meters
38 km= 38000 meters
Olivia is visiting her cousin Meg in Australia for Christmas. She is packing some beachwear to enjoy the beach during her Christmas vacation in Australia. Her friend Holly is puzzled as to why she’s packing beachwear for a December vacation.
Choose all the statements that Olivia can use to explain the reason to her friend Holly.
Group of answer choices
At any given time, different parts of Earth experience different seasons.
At any given time, all parts of Earth experience the same season.
Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly.
When the southern hemiphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
Winter occurs when sunlight reaches the northern or the southern hemisphere directly.
-- At any given time, different parts of Earth experience different seasons.
-- At any given time, all parts of Earth experience the same season. NOT
-- Summer occurs when sunlight reaches the northern or the southern hemisphere directly.
-- Summer Occurs when sunlight reaches the northern or the southern hemisphere indirectly. NOT
-- When the southern hemisphere is tilted towards the sun, it receives more sunlight, so southern hemisphere experiences summer.
-- Winter occurs when sunlight reaches the northern or the southern hemisphere directly. NOT
In other words, December in Australia is like June in the central and south USA, Mexico, Guatemala, Nicaragua, El Salvador, Honduras, and Costa Rica.
Different parts of the earth experience different seasons, and the summers are due to the tilt of the axis that causes sunlight to reach the hemisphere.
What are seasons?Seasons are the climatic variation due to the tilted axis of the planet that results in different amounts of sunlight reaching the planet.
The region facing and tilted towards the sun experiences summers as the sun rays are direct towards that region.
As the axis is tilted towards the southern hemisphere then the region will experience the summers season, unlike the northern hemisphere.
Therefore, different parts of the earth undergo different seasons.
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A cube of gold-colored metal with a volume of 64 cm has a mass of 980 g. The density of pure gold is 19.3 g/cm³. Is the metal pure gold?
Answer:
No, the metal is not pure gold because density is equal to mass divided by volume and in this case we end up with about 15.3, making this metal less dense than gold.
Explanation:
The definition of density allows to find the answer of whether the metal is gold:
As the density of the material is less than the gold density . This is not pure gold
Density is defined as the mass of a body divided by its volume, it is a very important physical characteristic of the body since it is invariant.
[tex]\rho = \frac{m}{V}[/tex]
Where ρ is the density, m the mass and V the volume
They indicate that the object's mass is 980 g and it has a volume of 64 cm³, ask if it is made of pure gold.
The systems of units are systems of measurements to exchange magnitude without inconveniences, the most used system is the intentional system of measurements (SI), we re-educate the magnitudes to this system
m = 980 gr ([tex]\frac{1kg}{1000g}[/tex] ) = 0.980 kg
V = 64 cm³ [tex]( \frac{1m}{100 cm} )^3[/tex] = 64 10⁻⁶ m³
let's find the density of the object
ρ = [tex]\frac{0.980 }{64 \ 10^{-6} }[/tex]
ρ = 15.3 10³ kg/m³
The tabulated gold density is 19.3 10³ kg/m³
We can see that the density for the body is less than the gold density.
In conclusion with the definition of density we can find the answer for if the metal is gold is:
As the density of the material is less than the gold density. This is not pure gold
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How does the warm water at the bottom of a pot travel up
Answer: Because heat rises and it also makes the water bubble up which creates more height.
Explanation:
Answer Liquid on the bottom of the pot closest to the heat source starts to get hot; as that happens, it rises. The rising hot water is replaced by the cooler, more dense water molecules.
Explanation:
As a teacher, Kenneth must prepare for his classes and teach his students.
Preparing for classes and teaching students is known as
A. prestige
B. a social role
C. structure
D. status
Answer:
The answer is a social role.
Explanation:
Apex
Answer:
a social role :)
Explanation:
A rectangular boat has a width of 5 cm, a length of 8 cm, and a mass of 150 g. How far will the boat sink into liquid with a density of 1.2 g/mL? Check your answer.
Answer:
h = 3.125 cm
Explanation:
We are given;
Width; w = 5 cm
Length; l = 8 cm
Mass; m = 150 g
Density;ρ = 1.2 g/mL
Formula for buoyant force is
Fb = ρgV = ρghA
Now, V is volume and it is given by;
V = mass/density = 150/1.2
V = 125 mL
Converting to cm³ gives; V = 125 cm³
Thus:
Since ρgV = ρghA
ρ and g will cancel out to give;. V = hA
h is the displaced liquid
A is Area = width × length = 5 × 8 = 40 cm².
Thus; 125 = 40h
h = 125/40
h = 3.125 cm
Answer:
3.75 cm
Explanation:
You can divide the boat's mass by the product of width x length.
8cm x 5cm = 40
150/40 =
3.75
Bruh Im 4th on the leaderboard How is this possible
Answer:
I guess you just answered a lot of questions
Explanation:
Thanks for the points btw :)
Answer:
Congatulations I am never gonna make it up there OMEGALUL
Explanation:
Examine the chemical equation and statement.
Mg+2HCl⇌MgCl2+H2
The reaction is at equilibrium. The forward reaction is endothermic, and the reverse reaction is exothermic.
Given a decrease in temperature, how would the reaction shift?
a. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants MgCl2 and H2.
b. A decrease in temperature will cause the reaction to shift toward the endothermic reaction, which has the reactants Mg and HCl.
c. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants Mg and HCl.
d. A decrease in temperature will cause the reaction to shift toward the exothermic reaction, which has the reactants MgCl2 and H2.
Answer:
d
Explanation:
the endothermic reaction absorbs heat and exothermic emits heat. If we think of this from increasing the temperature, exothermic already emits heat so it would favor an endothermic reaction. In this instance, a decrease in temperature would do the opposite, which would favor the exothermic reaction.
Washing soda, a compound used to prepare hard water for washing laundry, is a hydrate, which means that a certain number of water molecules are included in the solid structure. Its formula can be written as Na2CO3⋅χH2O where x is the number of moles of H2O per mole of Na2CO3 When a 2.558-g sample of washing soda is heated at 125∘C all the water of hydration is lost, leaving 0. 948 g of Na2CO3.What is the value of x?
Answer:
X = 10
Explanation:
First, we need to calculate the moles of Na₂CO₃ in the 0.948g. Then, the moles of water based on the difference of masses. X will be the ratio of moles of water and moles of sodium carbonate.
Moles Na₂CO₃ (Molar mass: 105.99g/mol):
0.948g * (1mol / 105.99g) = 8.944x10⁻³ moles
Moles H₂O (Molar mass: 18.02g/mol):
2.558g - 0.948g = 1.61g of water
1.61g * (1mol / 18.02g) =0.08935 moles
The ratio, X, is:
0.08935mol / 8.944x10⁻³ moles
X = 10I AM GETTING TIMED! PLEASE HELP ME!!
Explanation:
no.A (He) I think.............
May u guys give me the definition of this words
Direct Relationship -
Dependent Variable -
Inverse Relationship -
Independent Variable -
Cyclic Change -
Dynamic Equilibrium -
Answer:
Explanation:
Direct Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable also increases.
Example - For an enclosed gas it is observed that an increase in temperature (T) also results in an increase in pressure (P). Such is represented as P ∝ T which reads pressure (P) is directly related (or, proportional) to temperature (T). This does not mean that the variables temperature and pressure are equal, only that when one increases or decreases the other variable also increases or decreases proportionally.
Problems in Gas Laws relating pressure and temperature is typically referred to as The Gay-Lussac Law. Empirically it is represented by T₁/P₁ = T₂/P₂. Assume problem is given an enclosed gas at 25⁰C(= 298K*) and 750mm pressure. What is the pressure (P₂) if the temperature is increased to 35⁰C(= 308K)? and to 45⁰C(= 318K)?
*(Note: Problems in the empirical gas laws need to be worked in degrees Kelvin.)
T₁ = 25⁰C = 298K; P₁ = 750mm
T₂ = 35⁰C = 308K; P₂ = ?
T₃ = 45⁰C = 318K; P₃ = ?
T₁/P₁ = T₂/P₂ => P₂ = T₂·P₁/T₁ = 308K x 750mm / 298K = 775.17mm Pressure.
For P₃ calculation, one can work from either T₁,P₁ data or T₂,P₂ data.
This calculation chooses T₁,P₁ data.
T₁/P₁ = T₃/P₃ => P₃ = T₃·P₁/T₁ = 318K x 750mm / 298K = 800.34mm Pressure.
You apply T₂/P₂ = T₃/P₃ and you will find the same results for pressure.
Note that increasing temperature results in increasing pressure. This is 'direct relationship' analysis.
Dependent Variable & Independent Variable - The 'Dependent Variable' in a mathematical relationship 'Depends' upon an 'Independent Variable' which is chosen by the observer in order to determine the Dependent Variable. In the above problem, P is the dependent variable and T is the independent variable or, the variable the observer chooses to apply to the problem. Increases in Temperature (T) are chosen by observer to determine the Pressure (P). Increasing temperature (independent variable) results in increasing pressure (dependent variable).
Inverse Relationship - a mathematical relationship between two physical variables that depend upon one another such that when one variable increases the related variable decreases.
Example: A gas confined in a cylinder with a movable piston starting at Volume-1 (V₁) and at Pressure-1 (P₁) is changed to Volume-2 (V₂) will show a pressure value opposite to the direction of change (increased or decreased) to that of the volume change.
Problems in Gas Laws relating pressure and volume are typically referred to as Boyles Law problems. Empirically it is represented by V₁·P₁ = V₂·P₂. Assume problem is given an enclosed gas at 255ml and 750mm pressure. What is the pressure (P₂) if the volume is increased to 425ml? (Similar to pulling the plunger out of a syringe to increase volume.)
V₁ = 255ml; P₁ = 750mm
V₂ = 425ml; P₂ = ?
Using the Boyles Law relationship P₁V₁ = P₂V₂ => P₂ = P₁V₁ /V₂
P₂ = (750mm)(255ml)/(425ml) = 450mm
Note P₂ has a decreased pressure value which is opposite in direction to the change in the independent variable, volume-2 (V₂). That is, an increase in volume (V) resulted in a decrease in pressure (P).
Cyclic Change - Change that is repetitive or repeats within a noted (given) time interval. Weather change is cyclic in that fall => winter => spring => summer => fall => winter => etc.
Dynamic Equilibrium - In order to understand 'Dynamic Equilibrium' one must also define 'Static Equilibrium'. Static Equilibrium is when an object is not moving such as a marble sitting undisturbed on a level surface. All forces up, down, left & right are all equal. Dynamic Equilibrium is when an object is in motion at a constant speed on a level surface. All forces are also balanced forward, reverse, up & down. The term Dynamic Equilibrium is also applied to chemical reactions which means the rate of production of product is equal to the rate of production of reactant. This is typically represented by the equation Reactants ⇄ Products. the double arrow indicates a steady state condition of dynamic equilibrium.
The vapor pressure of liquid octane, C8H18, is 100 mm Hg at 339 K. A sample of C8H18 is placed in a closed, evacuated 537 mL container at a temperature of 339 K. It is found that all of the C8H18 is in the vapor phase and that the pressure is 68.0 mm Hg. If the volume of the container is reduced to 338 mL at constant temperature, which of the following statements are correct?
a. No condensation will occur.
b. Some of the vapor initially present will condense.
c. The pressure in the container will be 100. mm Hg.
d. Only octane vapor will be present.
e. Liquid octane will be present.
Answer:
the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.
Hence,
b. Some of the vapor initially present will condense.
e. Liquid octane will be present.
Explanation:
Given that;
The vapor pressure of liquid octane, C8H18, is 100 mm Hg at 339 K
Initial volume of the container, V1 = 537 mL
Initial vapor pressure, P1 = 68.0 mmHg
Final volume of the container, V2 = 338 mL
Let us say that the final vapor pressure = P2
From Boyle's law,
P2V2 = P1V1
P2 * 338 = 68.0 * 537
338 P2 = 36516
P2 = 36516 / 338
P2 = 108.03 mmHg
Thus, the final pressure (108.03 mmHg ) inside the container at 339 K is more than the vapor pressure of liquid octane (100 mmHg) at 339 K.
Hence,
b. Some of the vapor initially present will condense.
e. Liquid octane will be present.
4. What is the dependent variable in the statement below?
If the amount of coffee that Megan drinks
before bed increases, then the amount of sleep
she gets will decrease.
A. Amount of sleep
B. Amount of coffee
C. Type of drink
D. Before bed
What is science? what is science?
We define science as the knowledge that seeks to understand truths or natural laws to explain .
What science concept?In the most specific sense of the word, science is that type of knowledge that seeks to understand truths or natural laws to explain the functioning of things and the universe in general.
The concept of science can be defined as a body of systematized knowledge acquired through observation, identification, research and explanation of certain categories of phenomena and facts, and formulated methodically and rationally.
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Answer:
Science is the acquisition of our own knowledge through experimentation to explain and describe natural phenomena.
Explanation:
Science comes from the Latin word, Scientia, which means knowledge. Knowledge are facts that can be verified.
Determine whether or not each chemical formula is an empirical formula. CaCO3 Choose... C6H12O6 Choose... NaMnO4 Choose... Ba3(PO4)2 Choose... K2C2O4 Choose...
Answer:
CaCO3: empirical.
C6H12O6: not empirical.
NaMnO4: empirical.
Ba3(PO4)2: empirical.
K2C2O4: not empirical.
Explanation:
Hello.
In this case, since the empirical formula of a chemical compound is the smallest whole number ratio of atoms of each element in the compound, for each compound we proceed as follows:
CaCO3: it is empirical since the subscripts there cannot be reduced anymore.
C6H12O6: not empirical since the smallest whole number ratio of atoms would be CH2O.
NaMnO4: it is empirical since the subscripts there cannot be reduced anymore.
Ba3(PO4)2: it is empirical since the subscripts there cannot be reduced anymore.
K2C2O4: not empirical since the smallest whole number ratio of atoms would be KCO2.
Best regards.
The chemical formula that are empirical and not empirical are:
[tex]CaCO_3[/tex]- empirical[tex]C_6H_{12} O_6[/tex]- not empirical[tex]NaMnO_4[/tex]- empirical[tex]Ba_3(PO_4)_2[/tex]- empirical[tex]K_2C_2O_4[/tex]- not empiricalEmpirical formulaA chemical compound's empirical formula is the smallest whole-number ratio of atoms of each element in the compound.
[tex]CaCO_3[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]C_6H_{12} O_6[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]CH_2O[/tex]
[tex]NaMnO_4[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]Ba_3(PO_4)_2[/tex]: it is empirical since the subscripts there cannot be reduced anymore.
[tex]K_2C_2O_4[/tex]: not empirical since the smallest whole number ratio of atoms would be [tex]KCO_2[/tex]
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In a generic chemical reaction involving reactants A and B and products C and D, aA + bB → cC + dD, the standard enthalpy ΔH∘rxn of the reaction is given by
ΔH∘rxn = cΔH∘f(C) + dΔH∘f(D) − aΔH∘f(A) − bΔH∘f(B)
Notice that the stoichiometric coefficients, a, b, c, d, are an important part of this equation. This formula is often generalized as follows, where the first sum on the right-hand side of the equation is a sum over the products and the second sum is over the reactants:
ΔH∘rxn = ∑products nΔH∘f − ∑reactants mΔH∘f
where m and n represent the appropriate stoichiometric coefficients for each substance.
A. What is ΔH∘rxn for the following chemical reaction?
H2O(l) + CCl4(l) → COCl2(g) + 2HCl(g)
You can use the following table of standard heats of formation (ΔH∘f) to calculate the enthalpy of the given reaction.
Element/ Standard Heat of Element/ Standard Heat of
Compound Formation (kJ/mol) Compound Formation (kJ/mol)
H(g) 218 N(g) 473
H2(g) 0 O2(g) 0
CCl4(l) −139.5 O(g) 249
H2O(l) −285.8 HCl(g) −92.30kJ
C(g) 71 COCl2(g) −218.8kJ
C(s) 0 HNO3(aq) −206.6
B. Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: ΔH∘rxn = Σ npΔH∘f(products) − Σ nrΔH∘f(reactants)where n represents the stoichiometric coefficients.
Calculate the standard enthalpy change for the reaction 2A + B ⇌ 2C + 2DUse the following data:
Substance ΔH∘f(kJ/mol)A -225B -377C 181D -523
C. Ethanol can be made from the fermentation of crops and has been used as a fuel additive to gasoline. Write a balanced equation for the combustion of ethanol.
Answer:
A. ΔH∘rxn = 21.9 KJ/mol
B. ΔH∘rxn = 103 KJ/mol
C. C2H5OH + 3O2 → 2CO2 + 3H2O
Explanation:
A.
The standard reaction equation is given as:
aA + bB → cC + dD
Its standard enthalpy is given as:
ΔH∘rxn = cΔH∘f(C) + dΔH∘f(D) − aΔH∘f(A) − bΔH∘f(B)
Reaction given to us is:
H2O(l) + CCl4(l) → COCl2(g) + 2HCl(g)
So, its standard enthalpy will be:
ΔH∘rxn = (1)ΔH∘f(CoCl2 (g)) + (2)ΔH∘f(HCl(g)) − (1)ΔH∘f(H2O(l)) − (1)ΔH∘f(CCl4(l))
using the values from table:
ΔH∘rxn = - 218.8 KJ/mol + (2)(- 92.3 KJ/mol) - (- 285.8 KJ/mol) - (- 139.5 KJ/mol)
ΔH∘rxn = 21.9 KJ/mol
B.
Reaction given to us is:
2A + B ⇌ 2C + 2D
So, its standard enthalpy will be:
ΔH∘rxn = (2)ΔH∘f(C) + (2)ΔH∘f(D) − (2)ΔH∘f(A) − (1)ΔH∘f(B)
using the values from table:
ΔH∘rxn = (2)181 KJ/mol + (2)(- 523 KJ/mol) - (2)(- 225 KJ/mol) - (- 337 KJ/mol)
ΔH∘rxn = 103 KJ/mol
C.
Balanced equation for combustion of ethanol is:
C2H5OH + 3O2 → 2CO2 + 3H2O
Answer: is A B abd C
If the above quantum numbers describe two different electrons
in an oxygen atom, and the angular momentum number X is 1,
what is the possible number of Y?
Answer:
0
Explanation:
If no number occupies it it’s 0
Based on the given examples, what do you think is the main characteristic
of a liquid?
Characteristics of Liquids
Liquids have definite volume, but indefinite shape. They are free to form droplets and puddles when they are not inside a container. When a liquid is inside a container, it will take its shape. Unlike gases, a liquid will not change its volume to spread out and completely fill a container.
Between ethane and ethene, ethane is the most reduced substance. Explain why
please hurry
What is the wavelength in meters of a proton (mass = 1.673 x 10-24 g) that has been accelerated to 5% of the speed of light?
Explanation:
since it has been accelerated to 5℅ of the sleec of light then
v= 5/100 × (3× 10^8)
after getting velocity you'll substitute the values in the formula
de Broglie wavelength= h/mv
don't forget to change the grams in mass to kg
aorry I don't hav my calc with me
The purpose of the commas in this sentence to
Answer:
Commas are used to divide or separate parts of a sentence in order to make the meaning clear and the sentence easier to read. They mark a brief pause in the sentence, usually at a point where you would naturally pause if you were speaking rather than writing.
Explanation:
can i get brainly g?
Value: 4
The equation of a line for Data Set 4 is y = 0.14*x + -0.0398 where y is the absorbance
values and x is the concentration in mg/mL. This was created using data from known
concentrations and absorbances. Now we can use this equation of a line to determine
the concentration of an unknown solution.
Determine the concentration of an unknown solution that has an absorbance of 0.622.
Concentration =
mg/mL. Use two sig figs in your final answer
= 1/2
Next >
Answer:
x = 4.73
Explanation:
Given
y = 0.14x - 0.0398
Required
Find x when y = 0.622
To do this, we first substitute 0.622 for x.
y = 0.14x - 0.0398 gives
0.622 = 0.14x - 0.0398
Solve for 0.14x
0.14x = 0.622 + 0.0398
0.14x = 0.6618
Solve for x
x = 0.6618/0.14
x = 4.7271428571
x = 4.73 approximated
The modern periodic table is organized by:
O atomic number
O number of protons in each element
O atomic weight
hing
chemical properties
Answer:
Atomic number
Explanation:
The periodic table of elements arranges all of the known chemical elements in an informative array. Elements are arranged from left to right and top to bottom in order of increasing atomic number. Order generally coincides with increasing atomic mass. The rows are called periods.
The Modern periodic table is organized on the basis of increasing atomic Number.
An example of a heterogeneous mixture is
A) soil
B) sugar
C) carbon monoxide
D) carbon dioxide
Answer: soil
Explanation:
Soil is composed of various substances in varying proportion.
An example of a heterogeneous mixture is soil as it composed of different phases while all the other 3 substances are composed of single phase.
What is a heterogeneous mixture?
Heterogeneous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogeneous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogeneous mixtures are distinctly visible . There are two types of heterogeneous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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