The weighted average of the nail size in the sample data is 0.0571 d.
To calculate the weighted average of the nail sizes in the given data, we need to first calculate the total mass of all the nails in the sample. We can do this by multiplying the number of nails of each size by the mass of one nail of that size and then adding up the results:
Total mass = (24 nails of size 3d) x (3.30 g/nail) + (176 nails of size 16d) x (12.25 g/nail)
Total mass = 79.20 g + 2156.00 g
Total mass = 2235.20 g
Next, we can calculate the weight fraction of each nail size by dividing the mass of nails of each size by the total mass:
Weight fraction of 3d nails = (24 nails) x (3.30 g/nail) / 2235.20 g = 0.000360
Weight fraction of 16d nails = (176 nails) x (12.25 g/nail) / 2235.20 g = 0.007901
Finally, we can calculate the weighted average of the nail sizes by multiplying each weight fraction by the corresponding nail size and then adding up the results:
Weighted average = (0.000360 x 3d) + (0.007901 x 16d) = 0.0571 d
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7. if 45.52 ml of a potassium permanganate solution is needed to titrate 2.145 g of iron(ii) ammonium sulfate hexahydrate, calculate the molarity of the kmno4 solution.
The molarity of a solution is calculated from the number of moles of solute and the volume of solution in liters. The molarity of potassium permanganate solution 2.145 g of iron(ii) ammonium sulfate hexahydrate is 0.121 M.
What is molarity ?Molarity is used to represent the concentration of a solution. It is the ratio of number of moles of solute to the volume of solution in litres. Molarity depends on the temperature also.
The number of moles of a solute can be calculated from the molar mass and taken weight of the solute.
The molar mass of iron(ii) ammonium sulfate hexahydrate = 392.1 g/mol
Taken weight of solute = 2.145 g.
Therefore, the number of moles of iron(ii) ammonium sulfate hexahydrate = 2.145 / 392.1
= 0.0054 moles.
Now, the molarity of the solution is calculated as follows:
Molarity of solution =( no.of moles of iron(ii) ammonium sulfate hexahydrate ) / volume
= 0.0054 /0.045 L
= 0.121 M
Hence, The molarity of potassium permanganate solution 2.145 g of iron(ii) ammonium sulfate hexahydrate is 0.121 M.
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which statement about matter is true? responses matter is anything that is made of atoms and that has mass. matter is anything that is made of atoms and that has mass. matter is a compound. matter is a compound. matter is anything that is made of organic substances and is found on the earth. matter is anything that is made of organic substances and is found on the earth. matter is an element.
The true statement about Matter is that matter is anything that is made up of atoms and that has mass.
Matter is anything which is made up of mass and that has mass. and that occupies space.
If we talk about space, there is no matter because there is nothing but vacuum.
Matter is a general terms given to a group of atoms or molecules which are taken in a general.
We all are made up of atoms, because we al have mass and we all occupy some space. The same goes to anything that we can see or touch or feel that it exist.
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Answer: Matter is anything that is made of atoms and that has mass.
Explanation: I took the test.
what is the heat of a reaction, in joules, with a total reaction mixture volume of 67.9 ml if the reaction causes a temperature change of 6.5 oc in a calorimeter? assume that the reaction mixture has a density of 1.00 g/ml and a specific heat of 4.184 j/g-oc. the calorimeter has a heat capacity of 10.0 j/oc.
The heat of reaction is 1.8 KJ. A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes.
How to calculate calorimeter?A calorimeter is a device used in calorimetry, a procedure for calculating heat capacity and measuring the heat of chemical processes or other physical changes. Among the most popular kinds are differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters. Calorimeter, a tool for estimating a material's heat capacity and measuring the heat produced during a mechanical, electrical, or chemical reaction. bomb thermometer.Volume of water = 67.9 mL
Since the density of water is 1.00 g/mL
Density = mass/volume
Mass of water = Density × volume
Mass of water = 1 g/mL × 67.9 mL
Mass of water = 67.9g or 0.0679 Kg
Temperature change = 6.5 oC
Specific heat capacity of water= 4.184 J/Kg
From;
H = mcθ
m = mass of water
c = heat capacity of water
θ = temperature rise
Substituting values;
H = 0.0679 Kg × 4.184 J/Kg × 6.5 oC
H = 1.8 KJ
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How many moles are in 2.931g of sulfur?
What atom matches this electron configuration?
1s22s22p63s2 3p64s23d104p65s24d105p66s24f145d9
Mercury
Thallium
Gold
Platinum
Answer:
Gold
Explanation:
To recognize what element this is, we can simply look at the last orbital (5d9) and go to the periodic table and see what element is in that final orbital.
We go to row 6 (because of the 6s orbital at the beginning of this row) and then we see that our 6s orbital is full with 2 electrons, then our 4f orbital is full with 14 electrons, and our 5d orbital is not full where we only have 9 electrons instead of 10.
We then go to our 5d orbital and count 9 times into that orbital and end up with our final element being Gold (Au).
A certain atom contains 53 protons, 78 neutrons, and 54 electrons. What is the mass number of this atom?.
The mass number of this atom having 53 protons, 78 neutrons, and 54 electrons will be 131.
In the field of science, we can describe a mass number of an atom as simply a measure of the protons and neutrons that are to be found in the nucleus of an atom. In chemistry, the mass number is denoted by the letter 'A'.
In the above-mentioned case, the number of protons of the atom is 53 whereas the number of neutrons is 78.
In order to calculate the mass number, we will add the number of protons and neutrons. As the result of the addition of 53+78 is 131 hence, the mass number will be 131.
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Which of the following provides the best evidence that organ systems in the human body interact with one another
The best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment
Organ system is the group of tissue that work together for the overall function of organ and also organ system is the group of organ that work together to perform a specific function and the human organ consist of eleven organ system and that is respiratory, execratory, circulatory, digestive etc and the best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment because when your muscle and skeletal system are working to help your body increase heat when shivering
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which of these is not a product of the nuclear reactions inside the sun known as the proton-proton chain? helium nuclei polycyclic aromatic hydrocarbon molecules antimatter (positrons) neutrinos
The fusion of hydrogen nuclei into helium nuclei in the solar core is how the Sun obtains its energy. The proton-proton chain, a series of nuclear fusion processes, describes this hydrogen burning.
Protons, which are just single hydrogen atoms, are the starting point of this process inside the sun. Through a series of stages, these protons fuse together to form helium. This fusion process takes place in the sun's core, and the energy released as a result of transmutation maintains the sun's hot.
A deuterium (2H) nucleus is created from two protons in the first step of the hydrogen fusion process, along with an antielectron and a neutrino.
Four hydrogen protons and two electrons are used in the basic hydrogen fusion cycle, which results in the creation of a helium nucleus, two neutrinos, and six photons.
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which of the following statement(s) is/are true about chemical kinetics? group of answer choices chemical kinetics shows the transfer of energy in the form of heat and/or work. chemical kinetics is the branch of physical chemistry that is concerned with the direction in which a process occurs but in itself tells nothing about its rate. a reaction rate law must match the coefficients in the balanced chemical equation reaction rate can be defined as the decrease in the concentrations of reactants with time. chemical kinetics is the study of the rates of reactions.
The following two statements are true about chemical kinetics.
1. Chemical kinetics is the study of the rate of reactions.
2. A reaction rate can be defined as the decrease in the concentrations of reactants with time.
Chemical kinetics deals with the study of rate of chemical reactions. Rate of reaction is defined as the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.
The reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. The rate decreases as the reaction proceeds.
A→B
A= reactant rate of reaction =-[tex]\frac{d[A]}{dt}[/tex]
B=product rate of reaction=+[tex]\frac{d[B]}{dt}[/tex]
This means that the concentration of 'A' decrease with respect to time. It can also be noted by measuring the increase in the Concentration of B with the passage of time.
Negative sign indicates the conc. of reactants decreases with time
Positive sign indicates that conc. of product increases with the passage of time .Remember rate of reaction always positive.
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Synthetic materials are not found in nature and therefore they are typically developed in laboratories.
True
False
Answer: True
Explanation: Synthetic materials are not found in nature and can be created in labs using chemicals and compounds.
Elements that readily gain electrons tend to have a
a) high ionization energy and low electronegativity
b) low ionization energy and low electronegativity
c) high ionization energy and high electronegativity
d)l ow ionization energy and high electronegativity
Answer:
C. high ionization energy and high electronegativity
Explanation:
When an electron is gained or lost from an atom or a molecule, an ion is formed. When a molecule or atom gains electrons, anions (which are negatively charged ions) are formed.
8. a small cylinder of helium gas for filling balloons has a volume of 2.30 l and a pressure of 1850 atm at 25oc. how many balloons can you fill if each one has a volume of 1.5 l and a pressure of 1.25 atm at 25oc?
A total of 2269 balloons of 1.5 Liters volume and 1.25 atm pressure can be filled from the cylinder of volume 2.3 Liters and 1850 atm pressure.
The volume of the Helium gas is 2.3L and the pressure is 1850 atm at 25° Celsius.
The smaller balloons that has to be filled are of volume 1.5 L at the pressure 1.25atm at the same temperature of 25° C.
Because the temperature is conserved, so, according to Boyle's law,
When temperature is constant, the pressure and volume of the gas are inversely proportional to each other.
we can write,
P₁V₁ = P₂V₂
Let us say that a total n numbers of smaller balloons can be filled, so,
P₁V₁ = n(P₂V₂)
Where,
P₁ is pressure of bigger balloon,
V₁ is the volume of the bigger balloon,
P₂ is the pressure of the smaller balloon and,
V₂ is the volume of the smaller balloon.
Now, putting all the values,
2.30 x 1850 = n(1.5 x 1.25)
n = 2269
So, a total 2269 balloons can be filled from the bigger balloon to the smaller balloons.
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Use the chemical equation to complete the activity. 4Fe + 3O2 → 2Fe2O3 Iron (Fe) reacts with oxygen (O2) to form iron oxide. A scientist adds 15.4 grams of Fe to 3.6 grams of O2 to start the reaction. All of the iron and oxygen react to form iron oxide. Explain in detail how you can determine how many grams of iron oxide will be produced.
The mass of the iron oxide produced in the given chemical reaction is equal to 27.04 grams.
What is the limiting reagent?The limiting reagent in a chemical reaction can be described as that reactant that will decide the amount of the yield of the product. The reactant consumed first will confirm the completion of the reaction if the reactants are not taken in stoichiometry.
Given the chemical reaction of the formation of iron oxide:
4Fe + 3O₂ → 2Fe₂O₃
Given the mass of the iron = 15.4 grams
The moles of the iron = 15.4/56 = 0.275 mol
The mass of the oxygen gas = 3.6 grams
The moles of the oxygen gas = 3.6 /32 = 0.1125 mol
From the chemical equation, 4 moles of the Fe react with oxygen = 3 mol
Then 0.275 mol of the Fe will react with oxygen = 3/4 × 0.275 = 0.206 mol
Therefore, oxygen is the limiting reagent here.
The 3 mols of oxygen produced iron oxide = 2 mol
0.1124 mol of oxygen will produce iron oxide = (2/3) × 0.1125 = 27.04 g
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1. a. What is work? Write its SI unit and the factors affecting work
a factory has a batch of hand sanitizer with 50\pp, percent alcohol content. how much pure (100\00, percent concentration) alcohol should they include in a 600\,\text{ml}600 ml 600, start text, m, l, end text bottle to make a 68\hh, percent mixture?
Using the percentage by volume of the solutions given, we can calculate that we require 216 mL of 100% alcohol and 384 mL of 50% alcohol.
The percentages given refer to the percentage by volume (%V). We need to make 600 mL of 68% alcohol solution, by mixing a certain volume of 50% solution (A) and a certain volume of 100% alcohol (B). So, we know that:
A + B = 600 mL
We also know that the total volume of alcohol in the end solution needs to be:
0.68 * 600 mL = 408 mL
So, by extension:
0.50 * A + B = 408 mL
Based on the first equation, we can say that:
A = 600 mL - B
If we use that A in the second equation we get:
0.50 * (600 mL - B) + B = 408 mL
300 mL - 0.50 B + B = 408 mL
If we rearrange this equation we get:
B - 0.50 * B = 408 mL - 300 mL
0.50 * B = 108 mL
B = 108 mL / 0.50
B = 216 mL
A = 600 mL - 216 mL = 384 mL
So, we need 216 mL of 100% alcohol and 384 mL of 50% alcohol solution to get 600 mL of 68% alcohol solution.
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Answer:216 ml
Explanation: I got it right
when 27.64 g of a hydrocarbon is burned in a bomb calorimeter, the temperature increases by 54.91c. if the heat capacity of the calorimeter is 68.5 j/c and the sample is submerged in 1000 ml of water, how much heat (in kj) was produced by the hydrocarbon combustion?
By using the data given in the text and the specific heat capacity of water and its density, we can calculate that the amount of heat produced by hydrocarbon combustion was 233.6 kJ.
The heat released by hydrocarbon combustion is absorbed by the calorimeter and the water in it. To calculate the amount of heat (Q) produced by the combustion, we are going to use the specific heat capacity of water (c = 4.186 J/g°C), the heat capacity of the calorimeter (q = 68.5 J/°C) and the difference in temperature (ΔT = 54.91 °C):
heat absorbed by the calorimeter = ΔT*q
heat absorbed by water = ΔT*c*m
Q = ΔT*q + ΔT*c*m
m - the mass of water
To obtain the mass of water, we are going to use the volume (V = 1000 mL) of water and its density (d = 1.00 g/mL):
d = m/V ⇒ m = d * V
m = 1.00 g/mL * 1000 mL
m = 1000 g
Now we can plug all the known values in the formula for Q:
Q = 54.91 °C * 68.5 J/°C + 54.91 °C * 4.186 J/g°C * 1000 g
Q = 233,614.595 J
Q = 233.6 kJ
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Which elements has the lowest ionization energy
cs, mg, cu, ge, n, s, f
A student mixes 5.0 g of a sodium bicarbonate solution with 6.0 g of a potassium aluminum sulfate solution in a sealed container. A white, solid precipitate is formed. What is the total mass after the reaction has taken place?More than 11.0 gLess than 11.0 g11.0 gNot enough information
First, we have to remember the law of conservation of matter:
"The matter can not be created nor destroyed. It can only be transformed".
Then, the answer, in theory, has to be 11.0 g, that is the addition of 5.0 g and 6.0 g.
which is the correct answer
Answer C I think
Explanation:
calculate the volume of concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will you need to neutralize the solution after the copper is completely dissolved?
The volume of Concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will need to neutralize completely dissolved is 0.704 ml
4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l)
According to net Ionic equation 4 moles of HNO3 reacts with 1 mole of Cu(s)
moles of Cu in 0.36 gm of Cu = 0.36/63.5
moles = molarity*volume(L)
moles of Cu*4 =moles of HNO3
Let volume of HNO3 be x
0.36/63.5*4 = 16*x
x = 1.42 ml
c. Volume of HNO3 added = 1.64 ml
excess of HNO3 = 1.64-1.42
= 0.22 ml
Normality of NaOH and HNO3 is same i.e. equal moles of NaOH and HNO3 neutralises itself
molarity of NaOH = 5 moles/litre
moles of NaOH = Moles Of HNO3
5*x = 16*0.22
x = 0.704 ml
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what is periodic table
Answer:
the periodic table is the table of contents of the elements
Which list consists of elements that have the most similar chemical properties?
a) Cu, Zn, Fe
b) K, Ca, Br
c) Mg, Al, Si
d) Cs, Na, K
The list that consists of elements that have the most similar chemical properties is caesium, sodium and potassium (option D).
What is the periodic table?Periodic table is the tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
The periodic table is made up of chemical elements arranged in groups and periods. Chemical elements in the same group possess similar chemical properties.
According to this question, the following elements are in the same group 1:
Caesium is a chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal. Sodium is a chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.98977.Pottasium is an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983.Therefore, Cs, K and Na will have the most similar chemical properties because they belong to the same group.
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The strong attractive forces in ionic crystals make them ______, ______, and ______ solids. Group of answer choices rigid, hard, and brittle rigid, clear, and electronegative homogeneous, brittle, and ionic hard, electronegative, and homogeneous
The strong attractive forces in ionic crystal make them rigid , hard and brittle solid.
Ionic crystal are so strong because of the strong attractive forces between ions . Ionic compound formed between a positively charged ion and a negatively charged ion , the bond between them are so strong that make ionic crystal brittle. and also make it rigid. the presence of strong electrostatic force of attraction make the ionic crystal so hard. Due to the non directional nature of ionic bond make the crystal brittle.
Thus, The strong attractive forces in ionic crystal make them rigid , hard and brittle solid.
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The Earth's crust is part of which sphere?
Responses
biosphere
biosphere
atmosphere
atmosphere
hydrosphere
hydrosphere
lithosphere i need help asap
the total pressure of gases a, b, and c in a closed container is 4.1 atm . if the mixture is 36% a, 42% b, and 22% c by volume, what is the partial pressure of gas c? view available hint(s)for part a the total pressure of gases a, b, and c in a closed container is 4.1 . if the mixture is 36% a, 42% b, and 22% c by volume, what is the partial pressure of gas c? 1.5 atm 1.7 atm 0.22 atm 0.90 atm
Answer:
Explanation:
so
When you put aspirated spinach leaf disks in a beaker of sodium bicarbonate and place them in different colors of light, some disks float faster & more abundantly than others dependent on what color, if any, they were in. What made them able to float?.
The release of O₂( oxygen) from the process of photosynthesis is what made them to be able to float.
What is Photosynthesis?This is referred to as the process in which green plants manufacture their food in the presence of sunlight which is trapped by chlorophyll.They are known as primary producers and they use compounds such as water and carbondioxide.
The reactants mentioned above undergo series of reactions which leads to the production of glucose and oxygen is given off as a result which is the element responsible for the floating of the aspirated spinach leaf disks in this scenario.
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how many atoms are in 2.5 moles of c4h802
Answer:
1.505 × 10²⁴ atomsExplanation:
To find the number of entities in a given substance we use the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.5 moles
We have
N = 2.5 × 6.02 × 10²³ = 1.505 × 10²⁴
We have the final answer as
1.505 × 10²⁴ atomsHope this helps you
When a hydrogen atom is covalently bonded to either oxygen, , or fluorine there will be an attraction between that hydrogen and a lone pair of on a nitrogen, oxygen, or fluorine atom on an adjacent molecule. This attraction is called a bond.
Answer:
The attraction is a hydrogen bonding.
Explanation:
Based on the information on intermolecular forces, when a Hydrogen is specifically bonded with a Nitrogen, Oxygen or Fluorine, their bonding is called a hydrogen bond.
n the laboratory you dilute 4.49 ml of a concentrated 12.0 m nitric acid solution to a total volume of 150 ml. what is the concentration of the dilute solution?
The concentration of the dilute solution is 0.3592 M.
Concentration, or the amount of solute in a solution, can either be expressed in molarity, M, moles of solute per liter of solution, or molality, m, moles of solute per kilogram of solution.
If the concentrated nitric acid solution is 12.0 M, then there are 12.0 moles nitric acid per liter of solution.
For a 4.49 ml of a concentrated 12.0 M nitric acid solution, the number of moles is 0.05388.
M = moles of solute / volume of solution
moles = 12.0 M(4.49 ml)(1 L / 1000 ml)
moles = 0.05388 moles nitric acid
If the total volume is 150 ml, then the concentration of the diluted solution is
M = moles of solute / volume of solution
M = 0.05388 moles nitric acid / 150 mL (1 L / 1000 ml)
M = 0.3592
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why was it important to use a volumetric pipette and volumetric flasks (instead of some other glassware, for example, a graduated cylinder, etc.) for the preparation of all solutions in this procedure?
It is important to use a volumetric pipette and volumetric flasks because they are marked with one trace, they are calibrated and there are very less chance of error in them.
The percentage error of volumetric flask is very low at 0.3%. Volumetric pipette and volumetric flasks are specially designed to give accurate measurements of liquids and make them suitable for preparing standard solutions.
The volumetric pipette has a long and narrow neck which makes it easier to measure.
Graduated cylinders are more accurate then beakers. However they are not used to carry volumetric evaluations for this purpose volumetric tools like flasks and pipettes are used because they are more accurate and exact.
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