which metal can be obtain from calvertie ores?
Answer:
Ore
hope this helps
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What is the correct order of the scientists in order of their work related to the structure of an atom from earliest to most recent?
Neils Bohr, Ernest Rutherford, JJ Thomson, John Dalton, Democritus and Erwin Schrodinger
Erwin Schrodinger, JJ Thomson, John Dalton, Neils Bohr, Ernest Rutherford and Democritus
Democritus, John Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr and Erwin Schrodinger
John Dalton, Neils Bohr, JJ Thomson, Democritus, and Ernest Rutherford and Erwin Schrodinger
PLEASE HELP !!!
Answer:
C. democritusm John dalton, JJ Thomason, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
The correct order of the scientists in order of their work related to the
structure of an atom from earliest to most recent include Democritus, John
Dalton, JJ Thomson, Ernest Rutherford, Neils Bohr, and Erwin Schrodinger.
Democritus was regarded as one of the earliest scientist who first proposed
atomic theory around 460 BC which was then modified and used by others
such as John Dalton, JJ Thomson, Ernest Rutherford and Neils Bohr.
The most recent of them all was Erwin Schrodinger which was the wave
equation for electron movements in the 20th century.
Read more on https://brainly.com/question/20339664
PLEASE HELP! DUE in 5 minutes
Answer:
Fluorine-18
Explanation:
An isotope is an element with different amounts of neutrons. The element itself will not change.
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Answer:
ok thats cool good luck with that and always remember God is there for you :)
Answer:
yeah
Explanation:
in every situation we should trust God
if it were a very hot day , how would the speed at which we smelled the perfume change ? what about a very cold day ? why ?
Explanation:
On a hot day, the speed at which we perceived the smell of the perfume will be much faster due to the increase in kinetic energy of the perfume molecules.
Based on the kinetic molecular theory of gases, the average motion of particles increases as their thermal energy increases. On a hot day, the heat causes an increase in the average kinetic energy of the particles and the perfume molecules moves faster.
On a cold day, the molecules are slower and the rate at which we perceive the perfume smell is very slow. The particles will diffuse less faster and this is due to the low average kinetic energy they possess.
Models are used to show which qualities of a compound’s chemical structure? a. bond angles c. bond length b. element color d. both a and c
Answer:
a. bond angles c. bond length
Explanation:
Models are abstractions of the real world. They are used to present either real or hypothetical situations either visually, graphically or through mathematical expressions.
In chemistry, to show bond angles and bond lengths, different models are used. One of such is the VESPR - valence shell electron pair repulsion- theory which the model upon which the bond relationships between elements in a compound is shown. Also, the hybridization schemes are excellent models for showing bond relationships.Plz answer the question
Answer:
Equation:
p + 8p = 63
9p = 63
Divide both sides by 9:
p = 7
The parakeet weights 7 ounces.
Weight of fish:
The fish weights 8 times as much as the parakeet, or 8 * 7 = 56 ounces
The fish weights 56 ounces.
Explanation:
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in one molecule we have one oxygen atom so we will have 4 oxygen atoms in 4 molecules
In order to become stable, Potassium, K, will _______ and have a resulting charge of _____.
A)gain an electron, +1
B)gain 7 electrons, +7
C)lose an electron , +1
D)gain 7 electrons, -7
Answer:
D
Explanation:
it doesn't matter how many protons k has all the answers have electron with the positive charge when is negative the question is trying to distract you D is the only one that would use the electrons sign correctly
what has 16 protons and -2 charge? PLEASE NEED IT FOR FINALS FOR CHEMISTRY!!
Answer:
Sulfur
Explanation:
it has 16 proton and 2- charges
What are some ways to reduce friction? List at least 3 .
Answer:
Ways to reduce friction are by using oil, rollers from roller blades or other stuff that has a roller in or on it, wax, and grease.
Explanation:
Oil can reduce friction because it is used as a lubricant to reduce friction so moving surfaces slide smoothly over one another the same thing with wax and grease. The rollers are because they reduce friction by reducing contact between moving surfaces.
what is the energy source that powers plate movement?
A magma and lava
B Earth's magnetic field
C the sun
D Earth's hot interior
Answer:
D Earth's hot interior
Explanation:
The internal heat engine of the earth is the energy source that powers plate movement.
The sun drives the surface process and provides energy for the external heat engine
The earth's interior sources it heat from: decays of radioactive isotopesremnant heat from the formation of the earthfrictional heating from the movement of the earthTherefore, the heat is used to melt rocks and set up convection currents that drives plate movements.
a)Calculate the mass of NaNO3 that heated strongly and produced 4.5 dm3(cubic decimeter) of O2 gas.
The chemical equation for a chemical reaction is given below (2)
2NaNO3 ---> 2NaNO2 +O2
b) Calculate the concentration of HCl solution formed by dissolving 200 g HCl in 300 CM3 of water.(2)
Answer:
a) 34 g
b) 18.33 moldm^-3
Explanation:
a) The equation of the reaction is;
2NaNO3----------> 2NaNO2 + O2
Let us recall that 1 mole of a gas occupies 22.4 dm^3. Since 1 mole of O2 is produced in the reaction, we can write;
2 moles of NaNO3 yields 22.4 dm^3 of O2
x moles of O2 yields 4.5 dm^3 of O2
x = 2 * 4.5/22.4
x = 0.4 moles of NaNO3
But number of moles = mass/molar mass
molar mass of NaNO3 = 85 g/mol
Mass of NaNO3 = 0.4 moles * 85 g/mol
Mass of NaNO3 = 34 g
b)
Number of moles in 200g of HCl = mass/molar mass
molar mass of HCl = 36.5 g/mol
Number of moles = 200g/36.5 = 5.5 moles
From;
Number of moles = concentration * volume in dm^3
concentration = Number of moles/ volume in dm^3
But volume = 300 cm^3 or 0.3 dm^3
concentration = 5.5/0.3 = 18.33 moldm^-3
Consider the reaction H2O(g)+Cl2O(g)=2HClO(g). At equilibrium,the concentrations of the different species:[H2O]=0.077M,[Cl2O]=0.077M,[HClO]=0.023M. What is the equilibrium constant for the reaction at this temperature?
Choices: 0.089, 0.26, 3.9, or 11
The equilibrium constant K : 0.089
Further explanationGiven
Reaction
H₂O(g)+Cl₂O(g)⇔2HClO(g)
[H2O]=0.077M,[Cl2O]=0.077M,[HClO]=0.023M
Required
the equilibrium constant
Solution
The equilibrium constant or Kc is the value of the concentration product in the equilibrium state of the substance in the right segment divided by the product of the substance in the left section, each of which has a reaction coefficient raised
[tex]\tt K=\dfrac{[HClO]^2}{[H_2O][Cl_2O]}\\\\K=\dfrac{0.023^2}{0.077\times 0.077}\\\\K=0.08922[/tex]
Which form of erosion would be the slowest?
Answer:
wind is the correct answer
A. 207 kJ
B. 4730 kJ
O C. 9460 kJ
O D. 414 kJ
Answer:
C = 9460 Kj
Explanation:
Given data:
Mass of copper = 2kg
Latent heat of vaporization = 4730 Kj/Kg
Energy required to vaporize 2kg copper = ?
Solution:
Equation
Q= mLvap
by putting values,
Q= 2kg × 4730 Kj/Kg
Q = 9460 Kj
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Answer:
thunderstorms
Explanation:
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What type of bond is formed between atoms of a molecule of the product of this reaction? How can you determine which type of bond is formed between these atoms?
2 H2(g) + O2(g)⇒ 2 H2O(l)
Answer:
Explanation:
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.
Answer:
Covalent bond
Explanation: Hydrogen and Oxygen are both non-metals, with a low difference in electronegativity. They will share electrons.
When magnesium is heated in air, the product formed is heavier than the original ribbon. On the other hand when potassium magnate (7) is heated in air, the product formed is light. Explain the different observation
Answer:
See the answer below
Explanation:
When magnesium is heated in air, the element combines with oxygen to form a compound known as magnesium oxide according to the following equation:
[tex]2Mg(s) + O_2 (g)--> 2MgO (s)[/tex]
Hence, the product formed - a combination of magnesium and the oxygen component of air - is heavier than the original magnesium ribbon.
On the other hand, potassium manganate (7) is heated in air and decompose to form potassium manganate (6), manganate oxide, and oxygen gas according to the following equation:
[tex]2KMnO_4 --> K_2MnO_4 + MnO_2 + O_2[/tex]
Hence, the final product formed is lighter than the original product because oxygen gas has been evolved.
Answer:
During the heating of magnesium in air, it gains mass with the addition of oxygen present in air to form the oxide. However, during the heating of potassium manganate (vii), it decomposes or breaks down to simpler products and oxygen gas is given off.
Explanation:
During the heating of magnesium in air, it gains mass with the addition of oxygen present in air to form the oxide.
The equation for the reaction is given below:
2Mg(s) + O2(g) ---> 2Mg0
The molar mass of the magnesium metal is 24.0 g while the mass of the magnesium oxide is 40.0 g. The total mass of the metal before heating is 24 × 2. + 32 = 48.0 g. The total mass after heating = 48 + 32 = 80.0 g. Therefore, there is an increase in mass.
However, during the heating of potassium manganate (vii), it decomposes or breaks down to simpler products and oxygen gas is given off. The equation for the reaction is given below;
2KMnO4(s) ----> K2MnO4(s) + MnO2(s) + O2(g)
With the evolution of oxygen gas, there's a loss in mass of potassium manganate (vii). Molar mass of KMnO4 is 158.0 g while the mass of K2MnO4 is 197.0 g and that of MnO2 is 87.0 g. The total mass on the right hand side is 2 × 158 = 316.0 g. The total mass on the left-hand side with the exception of the gas evolved is 284.0 g. Therefore, there is a loss in mass.
Would this be point D or point E? (Picture)
Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.) C3H7OH+O2-- CO2 +H2O
The balanced equation :
2C₃H₇OH+9O₂⇒ 6CO₂ +8H₂O
Further explanationGiven
The following reaction(combustion of Propanol) :
C₃H₇OH+O₂⇒ CO₂ +H₂O
Required
Balanced equation
Solution
Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:
• 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.
• 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index (subscript) between reactant and product
• 3. Select the coefficient of the substance with the most complex chemical formula equal to 1
1. Give coefficient
C₃H₇OH+aO₂⇒ bCO₂ +cH₂O
2. Make an equation
C, left=3, right=b⇒b=3
H, left=8, right=2c⇒2c=8⇒c=4
O, left=1+2a, right=2b+c⇒1+2a=2b+c⇒1+2a=2.3+4⇒1+2a=10⇒2a=9⇒a=9/2
The equation becomes
C₃H₇OH+9/2O₂⇒ 3CO₂ +4H₂O x 2
2C₃H₇OH+9O₂⇒ 6CO₂ +8H₂O
The pH scale measures ___.
A. The concentration of hydrogen ions
B. The strength of solutions from 1 to 12
C. The concentration of bases
D. The concentration of acids
Answer:
a
Explanation:
it is the concentration of the hydrogen ion, more hydrogen ion more acidic less hydrogen ion less acidic and alkaline.
One atom of element A bonds with element E.
Answer:
Ae4
Explanation:
which virtually showed the reaction between group 4 element and group 7 element
How many joules must be added to a 1000 g iron skillet to increase its temperature
from 25°C to 250°C? The specific heat of iron is 0.449 J/gºC.
A) 449 J
B) 101,025 J
C) 50,000 J
D) 112,250 J
Answer:
B) 101,025
Explanation:
1000g * 0.449 J/g Celsius * 225 Celsius = 101,025
I got 225C from 250C - 25C
What is the molecular formula of a substance whose molar mass is 166.8 grams and its empirical formula is C2H4N2?
Answer:
C4H2O6
Explanation:
Minerals from water pass through the mold and over time the minerals fill that mold and it then becomes a cast in the same shape of the body of the animal that died?
True
False
find the mass of electron
Answer: mass of electron is
9.10938356 × 10^-31 kilograms
Explanation:
How is Zinc chloride formed in the lab and please tell the steps
Answer:
When zinc metal is reacted with hydrochloric acid, hydrogen gas is released and an aqueous solution of zinc chloride is produced. ... It is important that all of the zinc used be reacted and that large excess amounts of hydrochloric acid not be used.
Anhydrous zinc chloride is synthesized by treating zinc with hydrogen chloride. Whereas, hydrated and aqueous forms of zinc chloride are prepared by treating zinc with hydrochloric acid. Zinc metal could either be in the form of zinc sulfide or zinc oxide
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Merry Christmas
Answer: Anhydrous zinc chloride is synthesized by treating zinc with hydrogen chloride. ... Zinc metal could either be in the form of zinc sulfide or zinc oxide. ZnS(s) + 2 HCl(aq) → ZnCl2(aq) + H2S(g) There are impurities present in zinc chloride samples due to hydrolysis.
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Naturally occurring rubidium consists of just two isotopes. One of the isotopes consists of atoms having a mass of 84.912 amu; the other of 86.901 amu. What is the percent natural abundance of the heavier isotope
Answer:
The percent natural abundance is 27.95% for the heavier isotope (86.901 amu)
Explanation:
The atomic mass of Rubidium (Rb) is 85.468.
To find the percent natural abundance, first we need to use the following equation:
84.912x + 86.901(1-x) = 85.468
x represents the percent natural abundance, in basic decimal form
In order to find x, we will use the distributive property, combine like terms and then move the constant to the other side to get x.
We are first finding the percent natural abundance of the first isotope to make this easier for us.
84.912x + 86.901(1-x) = 85.468
-> 84.912x + 86.901- 86.901x = 85.468
-> 86.901 - 1.989x = 85.458 (like terms were combined)
-> Subtract both sides by 86.901
-> Divide both sides by-1.989x
x = 0.720462544
Now turn this into a percent by multiplying by 100.
--> 72.05% for the first isotope (the one that contains 84.912 amu)
To find the natural abundance of the other isotope (the denser, heavier isotope), you could just subtract 72.05 from 100 to save time, but the usually desired way (the way that your teacher would probably want you to do) is down below:
We plug this decimal for the x-value into the parentheses from earlier:
(1 -x) ---> ( 1 - 0.720462544 ) = 0.279537456
Now we just need to convert this to a percent by multiplying by 100
0.279537456 * 100 = 27.95% of the heavier isotope (86.901 amu)
1. In a Stock system name such as iron(III) sulfate, the Roman numeral tells us (a) how many atoms of Fe are in one formula unit. (b) how many sulfate ions can be attached to the iron atom. (c) the charge on each Fe ion. (d) the total positive charge of the formula unit. 2. Changing a subscript in a correctly written chemical formula (a) changes the number of moles represented by the formula. (b) changes the charges on the other ions in the compound. (c) changes the formula so that it no longer represents the compound it previously represented. (d) has no effect on the formula.
Answer:
See explanation
Explanation:
1) The formula of the compound is Fe2(SO4)3. There are two ion atoms in any formula unit as we can see here. Three sulphate ions are attached to iron. Each iron ion carries a +3 charge as we saw in the formula. The total positive charge in each formula unit is +6.
Changing a subscript in a correctly written chemical formula changes the formula so that it no longer represents the compound it previously represented. Hence FeSO4 is a different compound from Fe2(SO4)3.