Answer:
42,07%and 18,90%
Explanation:
What is the balanced chemical reaction when Aluminium reacts with NaOH to produce NaAlO2 and H2 gas?
Answer:
2NaOH + 2Al +2H2O = 2NaAlO2 +3H
Explanation:
Aluminum is an amphoteric element it reacts with both bases and acids to form a salt and hydrogen gas.The reaction is highly exothermic.
What are the various ways in which an atom of an element can achieve the noble gas configuration ?
Answer:
Atoms attain noble gas configuration by obtaining or donating and sharing of electrons present in their outermost shell.Which is made up of only one type of atom?
A.a solution
B.a homogeneous mixture
C.an element
D.a compound
Answer:
C. an element
Explanation:
Elements are pure substances and made up of only one type of atoms which cannot be further broken down.
Give an example of each of the following chemical changes.
(a) A photochemical reaction involving
(i) silver salt
(ii) water
(b) A reaction involving
(i) blue solution
(ii) formation of dirty green precipitate
(c) Two gases combine to form white solid.
(d) A reaction where colour change is noticed.
Answer:
Give an example of each of the following chemical changes.
(a) A photochemical reaction involving
(i) silver salt
(ii) water
(b) A reaction involving
(i) blue solution
(ii) formation of dirty green precipitate
(c) Two gases combine to form white solid.
(d) A reaction where colour change is noticed.
Explanation:
a) A photochemical reaction involving silver salt is used in black and white photography.
AgCl breaks down and converts into Ag during this photochemical reaction.
(ii) Photochemicalreaction involving water takes place in plants during the photosynthesis process.
Plants prepare food(carbohydrate) by using sunlight water and CO2 gas.
(b) A reaction involving
(i) blue solution:
For example reaction of copper sulfate solution with an iron nail.
When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.
(ii) Reaction of ferrous sulfate with NaOH forms a dirty green precipitate of ferrous hydroxide.
(C) Two gases combine and form a white solid:
For example when HCl gas reacts with ammonia gas, then a white solid of ammonium chloride will be formed.
(d) A reaction where the color change is noticed.:
When an iron nail is placed in CuSO4 blue color solution, then it changes to green color and reddish-brown solid deposits at the bottom of the container.
Find out how many atoms will fit in one apple . Adius of an apple is about 3.5 cm and the radius of an atom is 1.5 angstrom
Answer:
1.3 × 10²⁵ atoms
Explanation:
Step 1: Calculate the volume of an apple
The radius of an apple is 3.5 cm (3.5 × 10⁻² m). If we assume it is a sphere, we can calculate its volume using the following expression.
V = 4/3 × π × r³
V(apple) = 4/3 × π × (3.5 × 10⁻² m)³ = 1.8 × 10⁻⁴ m³
Step 2: Calculate the volume of 1 atom
The radius of 1 atom is 1.5 A (1.5 × 10⁻¹⁰ m). If we assume it is a sphere, we can calculate its volume using the following expression.
V = 4/3 × π × r³
V(atom) = 4/3 × π × (1.5 × 10⁻¹⁰ m)³ = 1.4 × 10⁻²⁹ m³
Step 3: Calculate how many atoms are in 1 apple.
V(apple)/V(atom) = 1.8 × 10⁻⁴ m³/1.4 × 10⁻²⁹ m³ = 1.3 × 10²⁵
Figure 1 (Use this figure to answer questions 6,7, and 8. Assume that the height at point
A and point C are the same)
С
B
As the car moves from point A, to point B, and finally to point C, the total energy of the car
decreases from point A to point B, then increases from point B to point
increases from point A to point B, then decreases from point B to point
O is lost between points B and C
stays the same, but is converted between potential and kinetic energy
Answer:
JWBVH
Explanation:
NWSBWHSBHS
An electron in a hydrogen atom moves from level 1 to level 4. The electron then drops from level 4 to level 2. Which
statement describes the most likely result?
O The energy absorbed in the first move equals the energy released in the second move.
O The energy absorbed in the first move is greater than the energy released in the second move.
O The energy released in the first move equals the energy absorbed in the second move.
O The energy released in the first move is greater than the energy absorbed in the second move.
Answer:
B
Explanation:
When the electron goes up levels it absorbs energy to enter that higher energy state. When it goes down, it releases energy but just not as much because 1-4 is more than 4-2.
ion has a mass number of 65, 36 neutrons, and a charge of +1
. Identify the element symbol, and determine the number of protons and electrons in this ion.
Answer:
Copper; Symbol is Cu
Protons = 29
Electrons = 29
Mass number = Protons + Neutrons
•°• Protons = Mass number - Neutrons
= (65-36)
= 29
Electrons is equal to the number of protons in a nucleus.
______is composed of substance that are spread evenly among each other.
Answer:
a solute
Explanation:
the answer is a solute
Complete and balance the equation for the single-displacement reaction. Phases are optional. balanced equation: 2NaBr+Cl2=2NaCl+Br2
What is the wavelength of light with 4.01 x 10^-19 J of energy? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's constant is 6.626 x 10^-34 Jos.)
A. 1820 nm
B. 496 nm
C. 202 nm
D. 551 nm
Answer:
D
hope it helps:)))!!!!!!
The concept Planck's quantum theory of radiation is used here to determine the wavelength of the light. The wavelength of the light with 4.01 x 10⁻¹⁹ J of energy is 496 nm . The correct option is B.
What is Planck's quantum theory?According to Planck's quantum theory, different atoms and molecules can emit or absorb energy in discrete amount only. The smallest amount of energy which can be emitted or absorbed in the form of electromagnetic radiation is called quantum.
The energy of the radiation absorbed or emitted is directly proportional to the frequency of the radiation. It is given by the equation:
E = hν
ν = E / h
4.01 x 10⁻¹⁹ J / 6.626 x 10⁻³⁴ = 6.05 × 10¹⁴ Hz
We have,
ν = c / λ
λ = c / ν
3.00 x 10⁸ / 6.05 × 10¹⁴ = 4.958 × 10⁻⁷ m
1 nm = 1 × 10⁻⁹ m
4.958 × 10⁻⁷ m = 495.8 nm = 496 nm
Thus the correct option is B.
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Equation balancing
a. S(s) + O2(g) → SO3(g)
b. 2Al(s) + 3Cl2(g) ► 2AICI3(s)
E. 2NaOH(s) + H2SO4(ac) —Na2So (ac) + H2O(l)
d. C3H8(g) + 50(g) -3C02(g) + 4H2O(g)
Answer:
For a: The balanced equation is [tex]2S(s)+3O_2(g)\rightarrow 2SO_3(g)[/tex]
For c: The balanced equation is [tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)[/tex]
Explanation:
A balanced chemical equation is one where all the individual atoms are equal on both sides of the reaction. It follows the law of conservation of mass.
For (a):The given unbalanced equation follows:
[tex]S(s)+O_2(g)\rightarrow SO_3(g)[/tex]
To balance the equation, we must balance the atoms by adding 2 infront of both [tex]S(s)[/tex] and [tex]SO_3[/tex] and 3 in front of [tex]O_2[/tex]
For the balanced chemical equation:
[tex]2S(s)+3O_2(g)\rightarrow 2SO_3(g)[/tex]
For (b):The given balanced equation follows:
[tex]2Al(s)+3Cl_2(g)\rightarrow 2AlCl_3(s)[/tex]
The given equation is already balanced.
For (c):The given unbalanced equation follows:
[tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+H_2O(l)[/tex]
To balance the equation, we must balance the atoms by adding 2 infront of [tex]H_2O(l)[/tex]
For the balanced chemical equation:
[tex]2NaOH(s)+H_2SO_4(aq)\rightarrow Na_2SO_4(aq)+2H_2O(l)[/tex]
For (d):The given balanced equation follows:
[tex]C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)[/tex]
The given equation is already balanced.
PLEASE ANYONE HELP!!!
How does an increase in -CH2 groups in an organic chain affect the boiling point?
A. The boiling point increases as more -CH2 groups are added.
B. The boiling point increases up to 4 CH2 groups and then begins to decrease.
C. The boiling point is not affected by -CH2 groups, only by functional groups.
D. The boiling point decreases as more -CH2 groups are added.
Answer:
I believe it's a.
Explanation:
When a substance freezes or condenses, which four of the following things are true for it's particles?
(Select 4 answers)
A. Lose energy
B. Gain energy
C. Move more
D. Move less
E. Become further apart
F. Become closer together
Answer:
Gain energy, move less, become closer together
(1) The solubility of Salt AB2(s) is 5mol/dm^3. (a) Obtain an expression for the solubility product of Salt AB2,in terms of s.
Answer:
See explanation
Explanation:
Let the equation of dissolution be;
AB2(s) ⇄A(aq) + 2S
Hence;
Ksp = [A] [2s]^2
Let the concentration of the species be s
Ksp= s × (2s)^2
Ksp= 4s^3
Since s= 5mol/dm^3
Ksp = 4(5mol/dm^3)^3
Ksp = 500 mol^2dm^-6
Identify the substance which has same number of molecules in 14g N2
a) 3.4g NH3
b) 15g NO
c)64g O2
d) 32g SO2
e)1g H2
A 30. g sample of Aluminum was heated to 40. 0C and placed in a calorimeter containing 50. g of water at 21 0C. What is the final temperature of the aluminum-water system if the cAl = 0.21 cal/g0C and cwater = 1.0 cal/ g 0C.
Write the complete equation you will use. 1 point
Substitute the values in the equation in step 1 . 1 point
Report the math answer with 2 sig figs and the correct unit. 1 point
Answer: The final temperature will be [tex]23^oC[/tex]
Explanation:
Calculating the heat released or absorbed for the process:
[tex]q=m\times C\times (T_2-T_1)[/tex]
In a system, the total amount of heat released is equal to the total amount of heat absorbed.
[tex]q_1=-q_2[/tex]
OR
[tex]m_1\times C_1\times (T_f-T_1)=-m_2\times C_2\times (T_f-T_2)[/tex] ......(1)
where,
[tex]C_1[/tex] = specific heat of aluminium = [tex]0.21 Cal/g^oC[/tex]
[tex]C_2[/tex] = heat capacity of water = [tex]1Cal/g^oC[/tex]
[tex]m_1[/tex] = mass of aluminium = 30. g
[tex]m_2[/tex] = mass of water = 50. g
[tex]T_f[/tex] = final temperature of the system = ?
[tex]T_1[/tex] = initial temperature of aluminium = [tex]40.^oC[/tex]
[tex]T_2[/tex] = initial temperature of the water = [tex]21.^oC[/tex]
Putting values in equation 1, we get:
[tex]30\times 0.21\times (T_f-40)=-50\times 1\times (T_f-21)\\\\56.3T_f=1302\\\\T_f=\frac{1302}{56.3}=23.13^oC=23^oC[/tex]
Hence, the final temperature will be [tex]23^oC[/tex]
where was the first oil well drilled
Answer:
First oil well in the United States, built in 1859 by Edwin L. Drake, Titusville, Pennsylvania.
what is the oxidation state of p in po4 3
Answer:+5
Explanation: A P3X
A properly designed experiments changes one variable at a time. A student wanted to know which type of sugar would yield the greatest amount of energy for the cell when metabolized during cellular respiration by mitochondria. The student mixed yeasts in three different sugar solutions: maltose, glucose, sucrose. The three sets of yeasts were monitored to determine which sugar type yielded the most energy. List three factors that the student must keep constant during the experiment
Answer:
The amount of water
The amount of sugar and
The amount of yeast
Explanation:
A constant variable is that variable in an experiment which must be kept the same for all groups in order not to alter the results of the experiment.
In this question, the independent variable i.e. the variable being manipulated is the TYPE OF SUGAR USED while the dependent variable i.e. variable that responds to change is AMOUNT OF ENERGY. Three different types of sugar were used viz: maltose, glucose, and sucrose. To not alter the outcome of the experiment, the constants of this experiment i.e. variables that must be the same for all groups of the experiment, include the following:
- The amount of water
- The amount of sugar
- The amount of yeast used
La siguiente reacción es altamente exotérmica: N2H4 + O2 → N2 + H2O ∆H= -622,4 Kj Cuánto calor se libera al producir 5 moles de nitrógeno.
Answer: -3112 kJ of heat will be released when 5 moles of nitrogen is produced.
Explanation:
We are given:
Moles of nitrogen = 5 moles
Given chemical reaction follows:
[tex]N_2H_4+O_2\rightarrow N_2+2H_2O;\Delta H=-622.4 KJ[/tex]
By stoichiometry of the reaction:
If 1 mole of nitrogen gas is produced, the heat released is -622.4 kJ
So, if 5 moles of nitrogen gas is produced, the heat released will be = [tex]\frac{-622.4kJ}{1mol}\times 5mol=-3112kJ[/tex]
Hence, -3112 kJ of heat will be released when 5 moles of nitrogen is produced.
Hello Everyone ✌
hw r y'all doin
Pls answer the below questions
What is Malleability
What is ductility
What is Sonorous
Answer:
Malleability describes the property of a metal's ability to be distorted below compression. It is a physical property of metals by which they can be hammered, shaped and rolled into a very thin sheet without rupturing. A malleable fabric could be planate by blow or rolling.
Explanation:
Ductility is the property of a solid, like a metal, to deform under a tensile stress (force). So if you pull on two ends of a metal wire or bar, and it “stretches” you have a ductile substance. Though I must caution that you don't confuse the definition of ductile to mean elastic. They are not synonyms. It is the opposite of brittle. When a ductile item breaks, it is after necking, where the diameter of the wire in question reduces as the length elongated. A brittle, or non-ductile material simple tears apart in a sharp and quick fashion with little to no visible necking taking place.
sonorous: producing sound (as when struck)
The study of the interaction of electrical and magnetic fields, and their interaction with matter, is called _____.
electromagnetism
superconductivity
relativity
magnetism
Answer:
The study of the interaction of electrical and magnetic fields, and their interaction with matter, is called Electromagnetism
17) A 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with what volume? HINT: Use the titration formula from table T. First multiply, then divide. o 1.5 mL O 7.5 mL 7 o 3.0 mL 0 30. mL
Answer: A 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with 3 mL volume.
Explanation:
Given: [tex]M_{1}[/tex] = 0.20 M, [tex]V_{1}[/tex] = 15.0 mL
[tex]M_{2}[/tex] = 0.10 M, [tex]V_{2}[/tex] = ?
Formula used is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula s follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\0.20 M ]times 15.0 mL = 0.10 M ]times V_{2}\\V_{2} = 30 mL[/tex]
Thus, we can conclude that a 0.20 M solution of HCl with a volume of 15.0 mL is exactly neutralized by the 0.10 M solution of NaOH with 3 mL volume.
Which of these is made up of smallest particles of rocks which contain decayed matter of plants and animals? A. Land B. Soil C. Mineral D. Sub-soil
Answer:B. as a mineral is a deposit of fine materials it would not contain decayed materials without outside assistance
Diseña un procedimiento que te ayudaría a obtener agua en el desierto usando como fundamento la destilación?
Answer:b
Explanation:
I searched it
PLZ HELP!!! QUESTIONS ARE BELOW!!! :D PLZ COMPLETELY ANSWER THE QUESTIONS WITH A GOOD ANSWER :)
Answer: sorry its lagging i hope this help fore 18.. =D
Explanation:
n,s is repeating the cycle of the inside
Answer/Explanation:
18, a,
I believe the n, and s represents North, South, or just the way the arrows are rotating repeatedly.
18, b,
The phenomenon re-occurring shows the alignment of magnetic dipoles with in a magnet, like inside. The arrows show a direction in the line with an external magnetic field in a way that it can produce its own magnetic fields that seem to travel from North to the South.
18, c,
Incorrect. Refrigerator magnets have multiple layers of magnification, they use opposite polarities to stay this way. If he puts the magnet sideways it may stick to the fridge
~ LadyBrain
Consider the balanced reaction below:
P2O3 + 3H2O → 2H3PO3
How many grams of diphosphorus trioxide, P203, are required to produce 10.2 moles of phosphorous acid, H3PO3?
Answer:
5.1 moles of P2O3 are required
Explanation:
Based on the reaction, 1 mole of diphosphorus trioxide, P2O3, reacts with 3 moles of water to produce 2 moles of phosphorous acid, H3PO3. That means the conversion factor is: 1mol P2O3 = 2mol H3PO3.
The moles of P2O3 required to produce 10.2mol H3PO3 are:
10.2mol H3PO3 * (1mol P2O3 / 2mol H3PO3) =
5.1 moles of P2O3 are requiredThe reactants of two chemical equations are listed.
Equation 1: CuSO4 and NaOH
Equation 2: Fe and CuSO4
Based on the type of reaction, which reaction can be used to extract copper metal from copper sulfate solution?
A - Equation 2, because Fe being more reactive, replaces Cu from CuSO4
B - Equation 2, because Fe being more reactive, replaces S from CuSO4
C - Equation 1, because Na being more reactive, exchanges position with Cu in CuSO4
D - Equation 1, because Na being more reactive, exchanges position with S in CuSO4
The reaction that can be used to extract copper metal from copper sulfate solution would be equation 2.
Fe will displace Cu from CuSO4 because it is more reactive. In other words, Fe ranks higher than Cu in the reactivity series.
Thus: [tex]Fe + CuSO_4 ---> Cu + FeSO_4[/tex]
Even though Na will displace Cu from CuSO4, equation 1 will result in the formation of Cu(OH)2 instead of free Cu because it is a double replacement reaction.
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Arrange the compounds in order of increasing entropy (S).
CH3OH(s)
CH3OH(l),
CH3OH(g),
CH3CH2OH(g)
CH3OH(s) > CH3OH (l) > CH3OH(g) > CH3CH2OH(g)
CH3OH(s) < CH3OH (l) < CH3OH(g) < CH3CH2OH(g)
Answer: The given compounds are arranged in order of increasing entropy (S) as [tex]CH_{3}OH(s) < CH_{3}OH(l) < CH_{3}CH_{2}OH < CH_{3}OH(g)[/tex]
Explanation:
The degree of randomness present in a substance is called entropy.
This means that more is the number of molecules weakly held together and rapidly moving from one place to another more will be its entropy.
In solids, the molecules are held together strongly with each other. So, they will have least entropy.
In liquids, the molecules are a little loosely held together. So, they have more entropy than a solid substance.
In gases, the molecules are held by weak forces due to which they move rapidly from one place to another. Hence, gases have high entropy as compared to solids and liquids.
Also, more is the molecular mass of a gas less will be its rate of effusion. Hence, less will be its entropy.
[tex]Rate of effusion \propto \frac{1}{\sqrt{M}}[/tex]
where,
M = molecular mass
Thus, we can conclude that given compounds are arranged in order of increasing entropy (S) as [tex]CH_{3}OH(s) < CH_{3}OH(l) < CH_{3}CH_{2}OH < CH_{3}OH(g)[/tex]