Answer:
Mass = 9.58 g
Explanation:
Given data:
Mass of Fe₂O₃ formed = ?
Mass of Fe = 6.7 g
Solution:
Chemical equation:
4Fe + 3O₂ → 2Fe₂O₃
Number of moles of Fe:
Number of moles = mass/molar mass
Number of moles = 6.7 g/ 55.8 g/mol
Number of moles = 0.12 mol
now we will compare the moles of Fe and Fe₂O₃.
Fe : Fe₂O₃
4 : 2
0.12 : 2/4×0.12 = 0.06 mol
Mass of Fe₂O₃:
Mass = number of moles × molar mass
Mass = 0.06 mol × 159.69 g/mol
Mass = 9.58 g
17. Given: CuSO
KlCul_K50)
Answer the following:
a. Determine the limiting reactant when 6.76 grams of copper(II) sulfate is reacted with 9.82
grams of potassium iodide?
b. Using the information from (a), what would be the mass of all three products?
C.
If 0.331 grams of iodine is produced, how many molecules of KI were reacted?
I think its c. I'm not 100% tho
Upon combustion, a 1.2743 g sample of a compound containing only carbon, hydrogen, and oxygen produces 3.2007 g CO2 and 0.9827 g H2O. Find the empirical formula of the compound.
The answer would be C8H12O2.
Here is the equation with masses :
1.2743 g CaHbOc + (3.2007 g + 0.9827 g - 1.2743 g) O2 ------> 0.9827 g H2O + 3.2007 g CO2
We are using 32.00 g/mol for O2
We are using 18.03 g/mol for H2O
We are using 44.01 g/mol for CO2
We don't know molecular mass of Hydrocarbon so we permit a,b and c to be any positive real number.
CaHbOc + 2.9091 g / 32.00 g/mol O2 ----> 0.9827 g/ 18.03 g/mol H2O + 3.2007 g/ 44.01 g/mol CO2
Now, calculate the above division
CaHbOc + (0.0909 mol) O2 -------> (0.0545 mol) H2O + (0.0727 mol) CO2
Matching coefficient we get
a = 0.0727
b = 2 * 0.0545 = 0.109
c = 0.0545 + 2*0.0727 - 2*0.0909
= 0.0181
Divide every number by 0.0181
a / 0.0181 = 0.0727/ 0.0181 = 4.01
b / 0.0181 = 0.109/0.0181 = 6.02
C / 0.0181 = 0.0181 / 0.0181 = 1
Multiply over number by 2
a = 4.01 * 2 = 8.02 ~ 8
b = 6.02 * 2 = 12.04 ~ 12
c = 1 * 2 = 2
Now putting these values we get C8H12O2.
The chemical name of the C8H12O2 is 2-Octynoic acid
Hence the empirical formula of the compound is C8H12O2.
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(b) .In an experiment, carbon (IV)oxide gas as passed over heated charcoal and the gas produced collected as shown in the diagram below Write an equation for the reaction that took place in the combustion tube (1mk)
When carbon (IV)oxide gas is passed over heated charcoal ,the gas produced is Carbon Monoxide.
The oxidation state of carbon (II) oxide, often known as carbon monoxide, is +2. It is the suffocating gas created when gasoline in car engines burns inefficiently. Colorless, tasteless, odorless, and somewhat less dense than air, carbon monoxide is a gas. It is formed due to incomplete combustion of CO2. Carbon monoxide is much more threatening than CO2.
When carbon (IV)oxide gas is passed over heated charcoal ,the gas produced is Carbon Monoxide is Carbon (II) oxide is formed.
When coke or red-hot carbon is passed through carbon (IV) oxide, it is created.
The equation for the reaction is-
CO₂(g) + C(s) → 2CO(g)
Hence, Carbon monoxide is formed when Carbon dioxide is passed over heated charcoal.
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if a heat sink has a temperature of 25°c, what is the change in entropy of the heat sink when 4000 j of heat energy is added to it? (1 point)
If a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.
How to calculate entropy?Entropy is the measure of the amount of energy in a physical system that cannot be used to do work.
The change in entropy, denoted by ∆S, can be calculated using the following formula:
∆S = Q/T
Where;
∆S = change in entropyQ = heat energy (J)T = temperature (K)According to this question, a heat sink has a temperature of 25°C, the heat temperature when 4000J of heat energy is added can be calculated as follows:
∆S = 4000J ÷ (25 + 273)
∆S = 4000J ÷ 298K
∆S = 13.42J/K
Therefore, if a heat sink has a temperature of 25°C, the change in entropy of the heat sink when 4000J of heat energy is added to it is 13.42J/K.
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A certain liquid has a density of 2.67 g/cm3. 30.5 mL of this liquid would have a mass of
Taking into account the definition of density, the mass of the liquid is 81.435 grams.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it measures the amount of mass in a given volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Mass of the liquidIn this case, you know that:
Density= 2.67 g/cm³Volume= 30.5 mL= 30.5 cm³ (being 1 mL= 1 cm³)Replacing in the definition of density:
2.67 g/cm³= mass÷ 30.5 cm³
Solving:
mass= 2.67 g/cm³× 30.5 cm³
mass= 81.435 g
In summary, the mass of the liquid is 81.435 grams.
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The head of a pin is approximately 1 mm in diameter. The diameter of an atom is on the order of 2.5 × 10^-10
meters. Calculate how many atoms it would take to line up across the head of a
pin. Show your work.
Answer:
Q: how many atom can fit on the head of a pin? About five million million hydrogen atoms could fit.
Explanation:
A pictorial representation of an electron configuration is shown give the full electron configuration do not use a noble gas abbreviation.
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p
what is the electron configuration?
Name the element, assuming that the configuration describes a neutral atom.
The electron configuration is 1s², 2s², 2p⁶, 3s²,3p⁶, 4s², 3d¹⁰, 4p⁵ i.e. 35 that is bromine.
What is electronic configuration?Electronic configuration is defined as the arrangement of electrons around the nucleus of a particular atom or molecule.
An atom is made up of particles like protons, neutrons and electrons.
A neutral atom are the atoms with same number of protons and electrons.
Electronic configuration of an atom is defined as distribution of electrons in atoms shells and sub shells.
Bromine is element with symbol Br and atomic number 35. It is a oily liquid with a sharp smell, it is toxic in nature.
The neutral atom of bromine has 35 electrons as the neutral atom has same number of electrons and protons.
Thus, the electron configuration is1s², 2s², 2p⁶, 3s²,3p⁶, 4s², 3d¹⁰, 4p⁵, i.e. 35 that is bromine.
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practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dh
A hydrogen atom's diameter in its ground state is 1.06 x 10^-10 metres.
What makes up an atom of hydrogen?The hydrogen atom is the most basic of all the atoms because it only has one proton and one electron. There are two other hydrogen isotopes, deuterium and tritium, in addition to protium, which is the most prevalent form of the atom.The three known isotopes of hydrogen. The isotopes of hydrogen with mass numbers 1, 2, and 3What do you call two hydrogen atoms?Hydrogen gas molecules are composed of two hydrogen atoms bound together by a covalent bond. In other compounds, such as water with an oxygen atom and hydrocarbons with carbon atoms, hydrogen atoms also form covalent connections.learn more about hydrogen atom here
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the question you are looking for is
Practice entering numbers that include a power of 10 by entering the diameter of a hydrogen atom in its ground state, dh= 10.6x10^-11m, into the answer box.
Help! What role does lactase play in breaking apart the disaccharide lactose?
lactase provides a binding site for lactose to initiate chemical breakdown.
lactase lowers the activation energy needed to begin breaking down lactose.
lactase releases heat during the breakdown of lactose.
lactase prevents too many disaccharide molecules from clumping together during chemical reactions
Lactase lowers the activation energy needed to begin breaking down lactose and is the role it plays in the reaction which is therefore denoted as option B.
What is an Enzyme?This is referred to as a biological catalyst which increases the rate of a chemical reaction and is usually specific in nature. Examples include lactase,amylase which have substrates such as lactose and starch respectively.
Lactase which is an enzyme is involved in the breaking apart of the disaccharide known as lactose by lowering the activation energy thereby increasing the rate of the reaction and ensuring that is easily done.
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You have two pieces of jewelry. One of them is supposed to be pure silver. The first piece has a mass of
20.0 g and the other piece has a mass of 44.0 g. Both pieces displace 4.0 mL of water. Silver has a density
of 10.5 g/cm³. Which piece is actually silver?
The silver piece with mass of 44.0 g is an actual silver.
What is mass?A mass can be defined as a dimensionless quantity representing the amount of matter in a particle or object. The SI unit of mass is kg.
A density is defined as the measurement of how tightly a material is packed together.
To calculate the purity of silver first we have to calculate density of both the silver.
4.0 ml = 4.0 cm3
Density of 20.0 g silver = 20.0g/4.0 cm3 = 5.0 g/ cm3
Density of 44.0 g silver = 44.0g/4.0 cm3 = 11.0 g/ cm3
Thus, the density of 44.0 g of silver is near to density of pure silver hence, 44.0 g of silver is a pure silver.
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Determine the mass of barium carbonate containing 10% impurities if 6.72 liters of CO2 were formed when hydrochloric acid was added to it
The mass of barium carbonate containing 10% impurities if 6.72 liters of CO₂ were formed when hydrochloric acid was added to it is 65.78 g.
What is the mass of barium carbonate containing 10% impurities if 6.72 liters of CO₂ were formed when hydrochloric acid was added to it?The mass of barium carbonate containing 10% impurities that produced 6.72 liters of CO₂ when hydrochloric acid was added to it is determined from the equation of the reaction as follows:
Equation of the reaction: BaCO₃ + 2 HCl → BaCl₂ + H₂O + CO₂
Based on the equation of the reaction, 1 mole of barium carbonate produces 1 mole of CO₂.
1 mole of CO₂ has a volume of 22.4 liters
6.72 liters of CO₂ = 6.72/22.4 moles
6.72 liters of CO₂ = 0.3 moles
Moles of BaCO₃ reacted = 0.3 moles
Molar mass of BaCO₃ = 197.34 g/mol
Mass of 0.3 moles of BaCO₃ = 0.3 * 197.34 g/mol
Mass of 0.3 moles of BaCO₃ = 59.2 g
Since the barium contains 90% pure BaCO₃ and 10% impurity,
Mass of barium carbonate reacted = 59.2 g/0.9
Mass of barium carbonate reacted = 65.78 g
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when all quantum numbers are considered, how many different quantum states are there for a hydrogen atom with n
When all quantum numbers are considered, there are three (3) quantum states for hydrogen atoms.
The 3 quantum numbers of hydrogen is n, l and m.
n = principal quantum number, l = angular momentum quantum number,
m = angular momentum projection quantum number.
The hydrogen atom is simple and consists of a single negatively charged electron which moves around a proton which is positively charged. For hydrogen atom of specific energy, the number of states depends on the angular momentum. The total energy depends on the principal quantum.
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Write the number of significant figures
Answer:
52. 3
53. 2
54. 2
55. 5
Not sure what the line is on number 54, but I think the answer is 2.
GUYS PLEASE HELP. I HAVE THIS AS ONE OF MY TEST THING AND ITS FOR 100 POINTS. ILL COPY AND PASTE IT.
Question: Prior to an investigation on the human body, students predict how new cells are created. According to cell theory, which students prediction is correct
Responses
A. Humans are born with all the cells they will ever need. The cell grow and develop but are not replaced
B. New cells are created from nutrients in the food we eat, such as calcium
C. New cells are created from existing cells
D, New cells are created by the reproductive system to replace cells that wear out
Answer:
D, New cells are created by the reproductive system to replace cells that wear out
Explanation:
Because The cells are going through cell division from mitosis causing new cell to form
based on the strength of intermolecular forces present, arrange the following substances in order of increasing (lowest first) boiling point. explain how you arrived to that order. h2o, ch4, ch3ch3
Based on the intermolecular forces present. The increasing order of boiling point of the following compound is CH₃CH₃ < H₂O < CH₄.
What is the boiling point?The boiling point is the point or temperature at which the vapor pressure of a compound equals the vapor pressure of the atmosphere.
The boiling point of different compounds and substances is different. The boiling point of water is 100 °C, and the boiling point of CH₃CH₃ is -89 °C. The boiling point of CH₄ is 161.6 °C.
Thus, the increasing order of boiling point of the following compound is CH₃CH₃ < H₂O < CH₄.
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Can someone PLEASE write a poem about the Female reproductive system with 10 stanzas
washing soda is a hydrate of sodium carbonate. its formula is na2co3. x h2o. a 2.714 g sample of washing soda is heated until a constant mass of 1.006 g of na2co3 is reached. what is the value of x in the formula?
Washing soda is a hydrate of sodium carbonate. its formula is na2co3. x h2o. Here, the value of x in the formula is 10.
We are given that:
Mass of washing soda = 2.714g
Molar mass of Na2CO3 = 105.98 g/mol
The molar mass of washing soda = (105.98 + 18x) g/mol
Solution:
The chemical equation is given below:
Na2CO3.H2Ox -------> Na2CO3 + xH2O
1 mole of Na2CO3 produces 1 mole of sodium carbonate (Na2CO3) and x moles of water.
Now number of moles of Na2CO3 = (1.006 / 105.98) = 0.009492 moles
The number of moles of washing soda is equal to the number of moles of Sodium carbonate formed i.e. 0.009492 moles
Now
2.714 / 105.98 + 18x = 0.009294
x = 10.11
x = 10
The value of x in the formula is 10.
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What happens when you add a proton to make lithium more positive. Do you get a lithium cation or do you get something else?
When you add a proton to make lithium more positive we get beryllium
When you add a proton to make lithium more positive and does't make lithium cation it make beryllium and isotope of beryllium that is an ion, as it has one less electron than the protons and the only factor that determines the identity of your element is the proton number when we added a proton in lithium then we get beryllium and new atom would not actually be an atom if add one proton and when adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number
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question 11 use the internet to look up the sds for 2.0 m sodium hydroxide, naoh, to answer the following questions: a) list the potential acute and chronic health effects. b) identify the first aid measures for ingestion. c) identify whether or not it is flammable d) identify the chemicals that potentially produce a dangerous reaction with naoh. e) describe how to handle small spills and the personal protective required to work with naoh.
The compound is basic in nature but the concentration substance is corrosive.
What is NaOH?Sodium hydroxide is a compound that is formed from sodium and hydrogen as well as oxygen The compound is basic in nature but the concentration substance is corrosive.
a) The acute health effect of exposure to NaOH is skin burn while the chronic effect of exposure is damage to the lungs.
b) The first aid for the ingestion of NaOH is to take in plenty of water.
c) The compound is not flammable
d) The chemicals that could produce a dangerous reaction with NaOH are acids
e) To handle small spills, irrigate the affected area with plenty water and use lab coats, gloves and eye wear when working with the solution.
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How many milligrams of sodium chloride are in a liter of solution that has 4.50 x 10-6 kg of sodium per liter?
The mass of sodium chloride that is present in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter is 45 mg.
What is the mass of sodium chloride in milligrams that is present in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter?The mass of sodium chloride in milligrams that is presents in a liter of solution that has 4.50 x 10⁻⁶ kg of sodium per liter is calculated as follows:
mass = mass concentration * volume in litersMass concentration of sodium chloride solution = 4.50 x 10⁻⁶ kg of sodium chloride per liter.
Volume of solution = 1 liter
Mass of sodium chloride = 4.50 x 10⁻⁶ kg/L * 1 L
mass of sodium chloride = 4.50 x 10⁻⁶ kg
mass of sodium chloride = 4.50 x 10⁻⁶ kg * 1000000 mg/kg
mass of sodium chloride = 45 mg
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there are 393939 students in ms. salazar's chemistry class. if ms. salazar divides the class into 999 lab groups of 444 or 555 students each, what would be the number of lab groups with 555 students?
The total number of lab groups with 555 students is 447.
The total no. of students = 393939
Division of class into labs = 999
Let us consider there are two types of lab
No. of students in one type of lab = 444
No. of students in another type of lab = 555
Let the no. of labs which have 555 students = x
Then, remaining labs which contain 444 students can be calculated as
Total lab - x
= 999 - x
Calculation:Now, according to the question,
555( x) + 444 (999 - x) = 393939
555x + 443556 - 444x = 393939
-111x = - 49617
111x = 49617
x = 49617/ 111
x = 447
Thus, we calculated that the total number of lab groups with 555 students is 447.
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What would the mystery charge labeled "?" have to be for this object to have a net electric charge of +3?
For the net charge to be +3,the mystery charge should be is -2 and net force is towards left.
In first problem, overall charge should be -2 (as mentioned in question).So charge labelled with ? should be negative charge ( -ve). There will be net force on -1 charge towards +3 charge (left). For box (b)net force towards right For box c) net force towards right.It is often referred to as electric charge, electrical charge, or electrostatic charge, and denoted by the letter q, is a property of a unit of matter that indicates how many more or less electrons than protons it has.When retained in an electric or magnetic field, matter's basic physical feature known as electric charge causes it to experience a force.To learn more about charge visit:
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Calculate density
Mass = 23.6 g
Volume = 30.0 cm³
Answer:
Determine the weight of an object. For example, a glass of water weights 200 grams net (not including the glass).
Find out the volume of an object. In our example, it's 200 cm3 .
Divide weight by volume. 200 g / 200 cm3 = 1 g/cm3
Optionally, change the unit.
Explanation:
BEERS LAW - EASY - Use this method to calculate the molar concentration of "copper (II) sulfate" if it has a measured absorbance of 2.17. The absorbance of a 0.10 M solution is 0.96. Round your answer to correct significant figures and do not include units.
The molar concentration of copper (II) sulfate that has a measured absorbance of 2.17 is 0.23 M.
What is the concentration of the copper (II) sulfate" if it has a measured absorbance of 2.17?
The concentration of the copper (II) sulfate that has a measured absorbance of 2.17 is determined by the Lambert-Beer's law which is given below as follows:
A = ε * l * cwhere:
A = absorbance measured by the spectrometerε = molar absorptivity,l = path length of light through the cellc= concentration, in mol/L, of the sample solution being measuredSince the values of molar absorptivity and path length are constant, the Lambert-Beer's law can be expressed as follows:
A₁/C₁ = A₂/C₂
Where A₁ is absorption at concentration C₁
A₂ is absorption at concentration C₂
From the data provided:
A₁ = 0.96
C₁ = 0.10
A₂ = 2.17
C₂ = ?
C₂ = A₂ * C₁/A₁
C₂ = 2.17 * 0.1/0.96
C₂ = 0.23
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Which periodic trend is not explained by shielding and ENC?
O Atomic radius
O ENC does not explain any periodic trend
O ENC explains all periodic trends
O
Electronegativity
ENC explains all periodic trends
The electrostatic attraction between the positively charged nucleus and the negatively charged electrons holds electrons in an atom or ion. Due to electron shielding that exists between the electron of interest and the nucleus in multi-electron species, the electrons do not experience the full positive charge of the nucleus. The effective nuclear charge is the total positive charge that really affects an electron.
In order to comprehend periodic characteristics, it is crucial to understand the idea of effective nuclear charge (Z*). The portion of the total nuclear charge that an electron in an atom experiences is known as the effective nuclear charge. This is equal to the atomic number (Z) less the amount () by which other atoms' electrons protect the particular atom's nucleus.
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Why do we need to learn the proper way of writing and naming chemical compounds?
Answer:
To ensure that a spoken or written chemical name leaves no uncertainty concerning which chemical compound the name refers to
Andrew Huston states:
"Without the naming of compounds, we have no idea what we’re dealing with unless if you opt to state the chemical formula. Furthermore, a systematic way of naming compounds allows us to know more about the molecular structure and categorization just by the addition of a few suffixes/infixes/prefixes"
Why is the state of matter a physical property of matter?
Answer:
State of matter is not a chemical property of a substance,
Explanation:
This means that when an objects changes states of matter (such as from solid to liquid), a chemical change does not occur since the substance is the same. When an ice cube melts into water, it is still water. A chemical change only occurs when one substance turns into a different substance. State of matter only has to do with the amount of energy in the particles of a substance and their distance from each other.
An isotope has an atomic number of 36 and contains 44 neutrons. What is the isotope’s mass number?
the isotopes mass number is 36
Explanation:
because atomic number is also mass number
Which of the following are homogenous mixtures?
1. Solid steel
2. An aqueous solution of salt
3. Molten salt
A) 2 and 3
B) 1, 2, and 3
C) 1 and 3
D) 1 and 2
Thanks!
Answer:
i aint go the f 40
Explanation:
swervin how u look so perfect on ur worst day
. How would you separate a mixture of wood powders, iron powders, aluminum powders, and salts?
Explanation:
For those who like to step beyond the challenge, the mass of the materials could be measured to check the methodology. Prior to separating the mixture, measure the mass of the total mixture. After separating and drying all the materials, measure the mass of each material. Add the three masses together. The total should equal the initial mass if all materials were recaptured during the separation process.
Iron particles will be drawn towards a magnet when one is used. In this manner, aluminum powder and iron powder can be separated. Due to the fact that iron is magnetic but the other three are not.
Magnets are used in magnetic separation, a waste management technique, to remove metal from the trash. As the materials are gathered together and segregated before processing, this is most frequently seen in single and mixed streams of recycling.
This method can be used to eliminate unwanted metals from products. All materials are kept pure by it. Recycling facilities frequently use magnetic separation to isolate metals, purify ores, and separate components from recycling.
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