Answer: Because alchemy was based on mystical belief instead of the scientific method.Soo.. Chemistry uses experiments to test ideas whereas alchemy used superstitious practices.
Explanation:
Answer:
that was because Alchemy was based on experimentation and had little basis in Science, while Chemistry utilizes both experimentation and scientific practices.
Explanation:
The gas in the ozonosphere that absorbs most of the ultraviolet rays from the sun is the___. Oxygen Nitrogen Ozone. Carbon dioxide.
Answer:
Ozone
Explanation:
The ozone layer protects the UV rays and also theres a hole in it near antarica which is causing global warming!
Off topic sorry lol:P
I hope this helps i got the answer correct
Remember to mark brainliest
does the volume of a liquid change
Answer:
Yes it does change
Explanation:
yoooo help me w this one
Answer:
0.84kg of gatorade powder
Explanation:
From the question given, we were told that 0.6kg of gatorade powder required 5 gallons of water.
To obtain the mass of gatorade needed for 7 gallons of water, we simply do the following:
0.6kg of gatorade powder required 5 gallons of water.
Therefore, xkg of gatorade powder will require 7 gallons of water i.e
xkg of gatorade powder = (0.6 x 7)/5
xkg of gatorade powder = 0.84kg
Therefore, 0.84kg of gatorade powder will be required.
Consider the following reversible reaction. CO(g)+2H2(g) CH3OH(g) What is the equilibrium constant expression for the given system?
Kc=28.7 is the equilibrium constant
How is the equilibrium constant 28.7 explain?
[CO]=26.7g(28.01g/mol)(5.25L)=0.182M
[H2]=2.33g(2.016g/mol)(5.25L)=0.220M
[CH3OH]=8.65g(32.04g/mol)(5.25L)=0.0514M
Kc= x/(0.182−x)(0.220−2x)2
= 0.0514/(0.182−0.0514)(0.220−2(0.0514))2
= 28.7
What is equilibrium constant?a number that expresses the relationship between the amounts of products and reactants present at equilibrium in a reversible chemical reaction at a given temperature.
So, this shows the equilibirum constant is 28.7
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write an ionic equation of hydrogen peroxide reacting with sodium sulphite
Answer:
Na2SO3 + H2O2 = Na2SO4 + H2O
The ionic equation of hydrogen peroxide reacting with sodium sulphide is Na₂SO₃ + H₂O₂ = Na₂SO₄⁻ + H₂O⁺.
What is an ionic equation?A chemical equation known as an ionic equation expresses the constituents in an aqueous solution as dissociated ions. The ionic equation is written by using charge in them.
An example is "NaCl" is "Na⁺ + Cl⁻".
To write an ionic equation, we should write by dissolving all soluble ionic chemicals into their corresponding ions. To demonstrate that an ion is present in the solution, it should be displayed with its charge and an (aq). There is also a use of coefficient.
The reaction should be written as:
HS₂O₄ → 2H+ + (SO₄)²⁻
NaOH → Na+ + (OH)-
Na₂SO₄ → 2Na+ + (SO₄)²⁻
H2O exists in the molecular form
So we get 2H+ + (SO₄)²⁻ + 2Na+ + 2(OH)- →2Na+ + (SO₄)²⁻ + 2H₂O
Thus, the ionic equation is Na₂SO₃ + H₂O₂ = Na₂SO₄ + H₂O.
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the solution
. Which of the following trioxonitrate (v) will decomposes to its corresponding metal?
A. AgNO3 B. Zn(NO3)2 C. Pb(NO3)2 D. Cu(NO3)2
Answer:
A. AgNO3
I hope it's helps
Hydrochloric acid and sodium hydroxide can be combined to form sodium chloride and water. Which best explains the reaction? The mass of sodium hydroxide will result in the same mass of sodium chloride. The total mass of hydrochloric acid and sodium hydroxide will result in a lower total mass of sodium chloride and water. The mass of hydrochloride acid will result in the same mass of sodium chloride. The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water.
Answer:
The statement "The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water." is true due to the Law of Conservation of Mass which states that matter cannot be created nor destroyed.
The correct answer to the question is: The total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water.
Chemical equation is backed up by the law of conservation of matter (mass) which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to the other.
Thus,
The total mass of reactants is equal to the total mass of products.
For example: let us consider the reaction between hydrogen and oxygen to produce water
2H₂ + O₂ —> 2H₂OReactant:2H₂ = 2(2×1) = 2(2) = 4 g
O₂ = 2 × 16 = 32 g
Total mass = 4 + 32 = 36 gProduct:2H₂O = 2[(2×1) + 16]
= 2[2 + 16]
= 2[18]
Total mass = 36 gThus,
Mass of reactant = mass of productFrom the above illustration, we can conclude that the total mass of hydrochloric acid and sodium hydroxide will result in the same total mass of sodium chloride and water.
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Why is corn considered a material resource and an energy resource?
Answer:
This is because Corn is grown on land and has important values to man .These values include as a source of food for man and animals. It is also used as raw materials for the production of certain goods such as flour etc.
It is an energy resource because fermentation of corn gives rise to ethanol fuel which is used as a source of power to run machines and other equipment.
an element p has atomic number 13 while q has the atomic 16..write down electric configuration of p and q
Answer:
P = 2,8,3
q = 2,8,6
Explanation:
Because the first shell contain 2 electron and the 2nd contain 8 electron and the last shell contain the electron which is left
Explanation:
p=1s^2,2s^2,2p^6,3s^2,3p^1
q=1s^2,2s^2,2p^6,3s^2,3p^4
the quantum numbers are used in my answer.
there are 4 quantum numbers.
1.principal quantum numbers
2.angular momentum quantum numbers
3.magnetic quantum numbers
4.spin quantum numbers
In this case,the angular momentum quantum numbers is being used.it describes the unique quantum state of an electron and is designated by the letter L.this behaviour manifests itself as the shape of the orbital.electron shells have distinct shapes denoted by letters,s,p,d,f.
l can be numbers like,0,1,2,3
the maximum electrons in each letter is,
s=2
p=6
d=10
f=14
the shapes of the sub_shells
s sub_shell is spherical
p sub_shell is two dumb_bells
d sub_shell is four dumb_bells
f sub_shell is eight dumb_bells
Two compounds are standing at the same temperature. Compound "A" is evaporating more slowly than compound "B." According to the Kinetic Molecular Theory, which assumption can be made? A.) Compound B has a greater average kinetic energy. B.) Compound A has a greater average kinetic energy. C.) Compound A may have a lower molecular weight. D.) Compound B may have a lower molecular weight.
Answer:
Option D) Compound B may have a lower molecular weight.
Explanation:
Compound A and B are standing at the same temperature yet compound A is evaporating more slowly than compound B.
This simply indicates that compound B have a lower molecular weight than compound A.
This can further be seen when gasoline and kerosene are placed under same temperature. The gasoline will evaporate faster than kerosene because the molecular weight of the gasoline is low when compared to that of the kerosene.
Se mezclaron 2 soluciones de dicromato de potasio : 250 ml de una molaridad de 1.24m y 380ml de otra 0.65N. Determina la molaridad de la solución restante
Answer:
0.56M es la concentración de la solución restante
Explanation:
La molaridad de una solución es una unidad de concentración definida como la relación entre las moles de soluto (En este caso, dicromato de potasio) y el volumen de la solución.
Sabiendo que para el ion dicromato:
6M = 1N
La normalidad del ion dicromato se obtiene dividiendo entre 6 su molaridad.
Moles de dicromato en las dos soluciones son:
1. 0.250L × (1.24mol / L) = 0.310 moles de dicromato
2. 0.380L × (0.65eq / L) × (1eq / 6mol) = 0.042 moles de dicromato
Así, las moles totales de dicromato de potasio son:
0.310moles + 0.042 moles = 0.352 moles de dicromato
En un volumen de 250mL + 380mL = 630mL = 0.630L
La molaridad de la solución es:
0.352 moles / 0.630L =
0.56M es la concentración de la solución restanteClassify the changes involved in the following processes as physical or chemical changes: (a) Photosynthesis (b) Dissolving sugar in water (c) Burning of coal (d) Melting of wax (e) Beating aluminium to make aluminium foil (f) Digestion of food
Explanation:
a. chemical change
b. Physical change.
c. chemical change.
d. chemical change
e. Physical change.
f. chemical change.
compare the contrast the arrangment of elements in mendeleev prodic table and mordern prodic table
Answer: In Mendeleeve periodic table the elements are arranged in increasing atomic mass, whereas in the modern periodic table the elements are arranged in increasing atomic number. The further differences are as follows:
Explanation:
In Mendeleev periodic table there are 9 verticle columns, whereas in modern periodic table there are 18 verticle columns.
A group of nobel gases was not discovered in the Mendeleev periodic table, whereas the a nobel gas was placed separately in the modern periodic table.
Answer:
The elements are arranged in the growing order of atomic masses in Mendeleev's periodic table. On the other hand, the cells are placed in the modern periodic table in the vastly increased order of increasing atomic numbers that is a more fundamental characteristic than the orbital radius.
Explanation:
The stance of the elements throughout the Mendeleev periodic table was to comply with the atomic mass. The position of the elements in the modern periodic table is controlled by the electronic structure, which evaluates their characteristics. The place of isotopes in Mendeleev's periodic table was not justified. The category is based mostly on the number of atoms and not the molar weight in the periodic table of elements and thus is justified the location of isotopes. The periodic table provided by Mendeleev had some linguistic factors on the atomic mass. There have been no defects in current periodic law as regards atomic number. For example, potassium had a lesser height in Mendeleev's periodic table than argon. But this has been solved in the Modern periodic table. Argon supersedes phosphorus as atomic number 18 is argon, so potassium has 19. The periodic table on Mendeleev does not authors would like to thank why the characteristics of the components are replicated at frequent intervals of 2, 8, 18, and 32. That is paper outlines by the periodic table of elements. The periodic table of Mendeleev contains no clear cut components of different types of elements. There is a clear cut separation of different types of elements in the modern periodic table, like representative elements, oxygen atoms, affect consumers. The periodic table provided by Mendeleev is not easy to remember. The periodic table Traditional is easy to recall.Which is the solubility product expression for pbcl2(s)
This is how osmium appears in the periodic table. Rounded to the nearest whole number, how many neutrons, on average, are in an atom of osmium?
76
114
190
266
Answer:
114
Explanation:
bottom number minus top number. just did the test
Why is sodium stored in kerosene oil?
Answer:
Sodium is stored under kerosene because of its high chemical reactivity with almost all of other elements (for example oxygen from air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make the sodium inert. Usually when Na reacts with a solvent it liberates hydrogen gas from its composition.
Explanation: Just saying , I want to be honest. I copied and pasted this from google
SO3 is an empirical formula for which of the following?
Answer:
what are the options
Explanation:
there are no options
SO₃ is an empirical formula for S₂O₆ and the correct option is option C.
The empirical formula of a compound represents the simplest, most reduced ratio of the atoms present in the compound. It shows the relative number of atoms of each element in the compound, without indicating the actual number of atoms. In other words, it gives the simplest whole number ratio of the elements in a compound.
To determine the empirical formula, the relative amounts of each element in the compound are expressed in terms of moles or mass. Then, the ratios of the moles or masses are simplified to their lowest whole number values.
Thus, the ideal selection is option C.
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The complete question is -
SO₃ is an empirical formula for which of the following?
A. S₄O₂
B. SO₄
C. S₂O₆
D. S₂O₃
Which of the following represents C 4 H 10
Answer:
B
Explanation:
Option be is the only molecular structure with 4 carbon molecules and 10 hydrogen molecules
the lowest layer of Earths atmosphere is the__
Answer:
Troposphere
Explanation:
The troposphere is the lowest layer in the atmosphere, and where all the weather occurs. After the troposphere, there's the stratosphere, mesosphere, thermosphere, and exosphere.
I hope this helps!
Answer:
Troposphere is the lowest layer of the earths atmosphere.
Explanation:
A chemistry student in lab needs to fill a temperature-control tank with water. The tank measures 24.0 cm long by 21.0 cm wide by 13.0 cm deep.
In addition, as shown in the sketch below, the student needs to allow 2.0 cm between the top of the tank and the top of the water, and a round-bottom flask
with a diameter of 10.5 cm will be just barely submerged in the water.
Calculate the volume of water in liters which the student needs. Round your answer to the nearest 0.1 L. ol.2 cm
M
flask
OL
6
water
Answer:
The required volume of water the student needs is 4.9 litres of water
Explanation:
From the diagram related to the question, we have;
The dimensions of the tank are;
Length of tank = 24.0 cm = 0.24 m
Width of tank = 21.0 cm = 0.21 m
Depth of tank = 13.0 cm. = 0.13 m
Allowance provided between the top of the tank and the top of the water = 2.0 cm
Diameter of the round bottom flask, D = 10.5 cm = 0.105 m
Therefore, the radius of the round bottom flask, r = 0.105/2 = 0.0525 m
Therefore we have;
Depth of water in the tank = Depth of tank - Allowance provided between the top of the tank and the top of the water
∴ Depth of water in the tank = 13.0 - 2.0 = 11.0 cm = 0.11 m
Given that the flask is immersed in the water contained in the tank to raise the tank water level, we have;
Volume of water + Volume of flask in the tank = Length of tank × Width of tank × Depth of water in the tank
Volume of water + Volume of flask in the tank = 0.24 × 0.21 × 0.11 = 0.005544 m³ = 0.005544 m³× 1000 l/m³ = 5.544 l
The volume of the spherical flask = 4/3·π·r³ = 4/3·π·0.0525³ = 6.06×10⁻⁴ m³ = 6.06×10⁻⁴ m³ × 1000 l/m³ = 0.606 l
The required volume of water the student needs , V = Volume of water + Volume of flask in the tank - The volume of the spherical flask = 5.544 l - 0.606 l = 4.9 l.
How many electrons in mole will discharge
2g of Copper 2 ions
Explanation:
96.485 columbs=1 faraday will
deposit 64/2g= 32 g cu ion
therfore it will require
96,485 ×2/32 =? coulombs or 1/16 of
Faraday= 1 / 16 mole of electrons .
Which is evidence that a chemical reaction has likely occurred?
a liquid slowly losing volume
the formation of a precipitate
boiling water releasing steam
a change in the shape of a solid
Answer:
The formation of a precipitate
Explanation:
took thecquiz on edge. got it correct
The formation of a precipitate is a evidence that a chemical reaction has likely occurred.
What is Chemical Reaction ?
A chemical reaction is a process in which chemical bonds between atoms to break and reorganize, to form other new substances.
Evidence of a Chemical Reactionformation of precipitate a change in colorformation of a gastemperatureodor changeNow lets check all option one by one
Option (A): a liquid slowly losing volume
Here change in volume occurred which is not a evidence of a chemical reaction.
So it is incorrect option.
Option (B): the formation of a precipitate
Here formation of precipitate is a evidence of a chemical reaction.
So it is correct option.
Option (C): boiling water releasing steam
Here formation of evaporation takes places which is not a evidence of a chemical reaction.
So it is incorrect option.
Option (D): a change in the shape of solid.
Here change in shape occurred which is not a evidence of a chemical reaction.
So it is incorrect option.
Thus, from we can say that the formation of a precipitate is a evidence that a chemical reaction has likely occurred.
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Ammonia (NH3) reacts with oxygen to form nitrogen monoxide and water. All the materials involved in this reaction are gasses. 0.100 moles of each of the reactants are initially introduced to a 5.0-liter reaction vessel. a. What would be the quantity of each gas in the container upon completion of the reaction? b.What would be the partial pressure of each gas on the reaction vessel upon reaction completion if the temperature of the system is 105 degrees C? c. What is the total pressure of all the gases on the reaction vessel at 105 degrees C?
Answer:
a. 0.02 moles of NH₃, 0 moles of O₂, 0.08 moles of NO, 0.12 moles of H₂O
b. [tex]P_{NH_3}[/tex] = 12,576.5 Pa, [tex]P_{NO}[/tex] = 50,306.05 Pa, [tex]P_{H_2O}[/tex] = 74,459.1 Pa
c. The total pressure is 138,341.64 Pa
Explanation:
a. NH₃ + O₂ → NO + H₂O
The balanced chemical equation is first found to be
4NH₃ + 5O₂ → 4NO + 6H₂O
Therefore, we have;
4 moles of NH₃ reacts with 5 moles of O₂ to form 4 moles of NO and 6 moles H₂O
Dividing by the reactant with the highest number of moles which is 5 moles of oxygen gives;
4/5 moles of NH₃ reacts with 5/5 moles of O₂ to form 4/5 moles of NO and 6/5 moles H₂O
Which is the same as 4/5 moles of NH₃ reacts with 1 mole of O₂ to form 4/5 moles of NO and 6/5 moles H₂O
Multiplying by 0.100 gives;
0.1×4/5 moles of NH₃ reacts with 0.1 mole of O₂ to form 0.1×4/5 moles of NO and 0.1×6/5 moles H₂O
The quantity of each gas in the container upon completion of the reaction is therefore;
(0.1 - 0.1×4/5) = 0.02 moles of NH₃
0 moles of O₂
0.08 moles of NO
0.12 moles H₂O
b. Given that the temperature = 105°C, we have;
PV = nRT
P = nRT/V
Where:
n = Total number of moles = 0.02 + 0.08 + 0.12 = 0.22 moles
R = Universal gas constant = 8.3145 J/(mol·K)
T = Temperature = 105°C = 378.15 K
V = Volume = 5 litre = 0.005 m³
P = 0.22×8.3145×378.15/0.005 = 138,341.64 Pa
From Dalton's law of partial pressure, we have;
Partial pressure Pₓ = Xₓ × P
Where:
Xₓ = Mole fraction
Which gives for ammonia NH₃ with 0.02 moles;
Mole fraction = 0.02/0.22 = 1/11
[tex]P_{NH_3}[/tex] = 1/11 × 138,341.64 = 12,576.5 Pa
For the 0.08 moles of NO, we have
Mole fraction = 0.08/0.22 = 4/11
[tex]P_{NO}[/tex] = 4/11 × 138,341.64 = 50,306.05 Pa
For the 0.12 moles H₂O
P = 0.12×8.3145×378.15/0.005 = 74,459.1 Pa
Mole fraction = 0.12/0.22 = 6/11
[tex]P_{H_2O}[/tex] = 6/11 × 138,341.64 = 74,459.1 Pa
c. The total pressure = 12,576.5 Pa + 50,306.05 Pa + 74,459.1 Pa = 138,341.64 Pa.
what carries electric current from the cell to the other components of a circuit.
Answer:
The different objects that make up a circuit are called components. A circuit must have a power source, such as a battery, and the current flows through a conductor, such as a wire.
Explanation:
I hope that was useful.
112,300 joules heat is transferred when 240 g of a
metal sample is cooled from 880 °C to 13 °C. What
is the specific heat of this metal?
Answer:
0.54 J/goC
Explanation:
Recall that we define the heat transferred as ;
H= mcθ
Where;
H= heat transferred = 112300J
m= mass of the metal= 240g or 0.24 Kg
c= specific heat capacity of the metal = the unknown
θ= change in temperature = (880°C-13°C) = 867°C
Substituting values and making the specific heat capacity the subject of the formula;
c= H/mθ
c= 112300/ 240×867
c= 0.54 J/goC
Hence, the specific heat capacity of the metal is 0.54 J/goC.
One solution turns blue. A possible hydrogen ion
concentration for this solution is:
1x 10-2 M.
5x 10-2 M
5 x 10 M
1x 10-8 M
Answer:
1x10^-8 M
Explanation:
Since the solution turns blue, it mean the solution is a base.
Now, to know which option is correct, we need to determine the pH of each solution. This is illustrated below:
1. Concentration of Hydrogen ion, [H+] = 1x10^-2 M
pH =..?
pH = - log [H+]
pH = - log 1x10^-2
pH = 2
2. Concentration of Hydrogen ion, [H+] = 5x10-2 M
pH =..?
pH = - log [H+]
pH = - log 5x10^-2
pH = 1.3
3. Concentration of Hydrogen ion, [H+] = 5x10 M
pH =..?
pH = - log [H+]
pH = - log 5x10
pH = - 1.7
4. Concentration of Hydrogen ion, [H+] = 1x10-8 M
pH =..?
pH = - log [H+]
pH = - log 1x10^-8
pH = 8
A pH reading shows if the solution is acidic or basic. A pH reading between 0 and 6 indicates an acidic solution, a pH reading of 7 indicates a neutral solution while a pH reading between 8 and 14 indicates a basic solution.
From the above calculations, the pH reading indicates a basic solution when the hydrogen ion concentration was 1x10^-8 M.
First gets brainliest
Answer:
reactants : before arrow sign
: CH4 and O2
product : after arrow sign
: CO2 and H2O
the answer is the second option
I NEED HELP PLEASE! :)
-Provide TWO math based “you solve it” questions with answers for EACH of the laws. Please be sure to explain in detail how to solve the problems.
Answer:
See below.
Explanation:
1. Newton's first law
(a) Problem 1
What is the net force required to keep a 500 kg object moving with a constant velocity of 10 m·s?
Answer: None.
Explanation: An object in motion stays in motion unless a net force acts on it.
The object will keep moving at 10 m/s.
(b) Problem 2
A force of 20 N acts on a 10 kg object from the left. A force of 30 N acts on it from the right. What is the net force required to keep the object moving with a constant velocity of 10 m/s?
Answer: 20 N
Explanation:
The net force is
30 N - 20 N = 10 N
You must apply another 10 N from the left. The net force is then:
30 N - 30 N = 0
If there is no net force, the object will keep moving at 10 m/s.
2. Newton's second law
(a) Problem 1
What is the net force needed to accelerate an object at a constant 5 m·s⁻²?
Answer: 5 N
Explanation:
F = ma = 1 kg × 5 m·s⁻² = 5 kg·m·s⁻² = 5 N
(a) Problem 2
A net force of 2 N acts on a 1 kg object. What is the magnitude and direction of the acceleration?
Answer: 2 m·s⁻²
Explanation:
F = ma
2 N = 1 kg × a
a = (2 N)/(1 kg) = (2 kg·m·s⁻²\1 kg) = 2 m·s⁻²
The direction of the acceleration is the same as that of the applied force.
2. Newton's third law
(a) Problem 1
A person with a mass of 58 kg is standing near you. Diagram and calculate the opposing forces.
Answer: 570 N up and down
Explanation:
See Fig. 1. The person's mass exerts a downward force on the floor.
F = mg, where g is the acceleration due to Earth's gravity
F = 58 kg × 9.8 m·s⁻² = 570 kg·m·s⁻² = 570 N
The floor exerts an upward force of 570 N.
(a) Problem 2
A teacher (mass 65 kg) pushes a cart (mass = 12 kg) of equipment (mass = 7 kg). Her foot applies a force of 150 N backward on the floor against a frictional force of 24 N. Diagram the opposing forces and calculate the net force available to move the cart.
Answer: 126 N
Explanation:
See Fig. 2 below. The teacher's mass exerts a downward force W on the floor, which exerts an equal reaction force R upward. The cart and equipment also exert a downward force on the floor, which exerts the same force upward. We can ignore these forces because they do not contribute to forward motion.
The teacher's foot exerts a backward force of 150 N on the floor, which exerts an equal force forward. However, a frictional force of 24 N opposes the forward force.
The net external force is the force of the floor minus the opposing frictional force. Thus,
F = 150 N − 24 N = 126 N
which of these liquids is the least acidic?
Answer:
The answer is lemonade.
Weaker acids are those which tend to have a higher pH from 4 to at least 6 stronger acids have low pH from 2 and below that's from 2 to 0.
Hope this helps
Hope
why helium is duplet ??
Answer:
The outermost shell of helium for example is filled with only two electrons. Hydrogen and lithium become stable by acquiring the electronic configuration of the nearest inert gas, which is helium. This is the duplet (or duet) rule.
Explanation: