A sample of 25.0-g pure iron at the 85 °C is dropped into 75 g of water at 20°C. 22.25 °C is the final temperature of the water-iron mixture.
What is Specific Heat Equation ?The specific heat equation is represented as
Q = mcΔT
where,
Q = heat energy in Joules
m = mass of substance
c = specific heat
ΔT = change in temperature in K
For iron given that
m = 25 g
c = 0.45 J/g°C
T₁ = 85°C
Now by putting the values in the above formula then we get
Q₁ = mcΔT
= 25 × 0.45 × (T₂ - 85)
= 11.25 × (T₂ - 85)
For water given that
m = 75 g
c = 4.184 J/g°C
T₁ = 20°C
Now,
Q₂ = mcΔT
= 75 × 4.184 × (T₂ - 20)
= 313.8 × (T₂ - 20)
Now,
Heat is generated by the iron = Heat is gained by the water.
Q₁ = -Q₂
11.25 × (T₂ - 85) = - 313.8 × (T₂ - 20)
325.05 T₂ = 7232.25
T₂ = 22.25 °C
22.25 °C is the final temperature of the water-iron mixture.
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An atomic absorption method for determination of copper in fuel samples yielded a pooled standard deviation of spooled 5 0.27 mg Cu/mL (s S s). The analysis of an oil from a reciprocating aircraft engine showed a copper content of 7.91 mg Cu/mL. Calculate the 95 and 99% confidence intervals for the result if it was based on (a) a single analysis, (b) the mean of 4 analyses, and (c) the mean of 16 analyses
The Confidence interval i.e, CI is calculated by the formula
CI= x± zs/ √N
where,
z= Confidence level value
s= standard deviation
N= Total number of measurements taken
So, we know that,
For 95% confidence level,
z=1.96
For 96% confidence level ,
z= 2.58
We know that,
s= 0.27 mgCu/mL
x= 7.91 mg Cu/ mL
A)
99%CI = 7.91± 2.58×0.27/√1
= 7.91± 0.70 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √1
= 7.91± 0.53mgCu/mL
B)
99%CI = 7.91± 2.58×0.27/√4
= 7.91± 0.35 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √4
= 7.91± 0.26mgCu/mL
C)
99%CI = 7.91± 2.58×0.27/√16
= 7.91± 0.17 mgCu/mL
95% CI= 7.91± 1.96×0.27/ √16
= 7.91± 0.13 mgCu/mL
The 99% and 95% confidence level interval for single analysis can be calculated, and also for the mean of 4 and 16 analysis by changing the value of N.
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How many atoms of iron are in 3.47 g of iron?
Answer:
Explanation:
The atomic weight of iron (Fe) is 55.845 u. Since it's impossible to count the amount of atoms in a given mass of a substance, we measure atoms in moles. No matter what the element or compound is, there will be [tex]6.022 * 10^{23}[/tex] atoms in one mole of compound. This is called Avogadro's number. Atomic weight, also called molar mass, is measured in grams per mole. We first find the number of moles of iron in 3.47 grams by setting up an inequality: [tex]\frac{55.845 g}{1 mol} = \frac{3.47 g}{x mol}[/tex]. Solving this inequality shows that there are 0.06213627 moles of iron in 3.47 grams. Now, all we do is multiply that value by Avogadro's number, [tex]6.022*10^{23}[/tex]. This gives us 3.7418 * 10^22 atoms in 3.47 grams of iron.
You wish to prepare 189 grams of 5.70 % solution.
You will need _____ grams of sodium acetate and ____ mL of water.
Assume that the density of water is 1.00 g/mL.
You wish to prepare 189 grams of 5.70 % solution. You will need 10.773 grams of sodium acetate and 178.23 mL of water.
What is a solution?A solution is a homogenous mixture of a solute and a solvent. When two substance mixes perfectly together make a solution.
Given, that the density of water is 1.00 g/mL.
Preparation of 189 grams of 5.70 % solution.
Mass of CH₃COONa
189 x 5.70 / 100 = 10.773 grams
Mass of water = mass of solution – mass of solute
189 - 10.77 = 178.23 grams
Volume = mass / density
178.23 / 1.00 = 178.23 ml
Thus, the mass of sodium acetate is 10.773 grams, and the volume of water is 178.23 ml.
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Concentrated hydrochloric acid is approximately 12.2 M. If a student needs to prepare 250. mL of 0.500 M hydrochloric acid, what volume (mL) of concentrated acid is needed?
When 5.6g of iron reacts with sulfur, the mass of iron sulfide is 8.8g. What mass of sulfur reacted?
Fe + S -> FeS
A person who lives at sea level and a person who lives on a mountain both
boil water. Which statement compares the boiling points of water at these
locations?
A. It is higher at sea level than on the mountain because air pressure
is higher at sea level.
B. It is lower on the mountain than at sea level because air pressure
is higher on the mountain.
C. It is higher on the mountain than at sea level because air pressure
is lower on the mountain.
D. It is lower at sea level than on the mountain because air pressure
is lower at sea level.
SUBMIT
please help I am in trears trying to figure this out.....so..... Radon-226 emits alpha radiation and has a half-life of 3.8 days. Assume a starting mass of 6.00 grams of Rn-226. How many grams of Rn-226 will still exist after three half-lives?
1.769 grams of Rn-226 still exist after three half-lives.
How is mass calculated from half-life?Half-life of a substance is the time required by the substance to reduce to half of the initial value.It is used to explain how fast unstable atoms undergo radioactive decay.It is a constant for a lifetime of an exponentially decaying substance.
Formula of half-life when number of days and radioactive decay are given respectively as,
N[tex]_(t)[/tex]=N₀(1/2)[tex]_t[/tex]
λ=0.693/t[tex]_1/2[/tex]
According to the question given data is,
initial amount (N₀)=6.0 g
half life (t[tex]_1/2[/tex])=3.8 days
To calculate final mass after 3 half lives,days in 3 half-lives are calculated as,number of half lives×each half life period=3×3.8=11.4 days
Number of atoms existing after 11.4 days =N₀(1/2)[tex]^11.55[/tex]=N₀/3.391=6/3.391=1.769 g
Therefore,1.769 g of Rn-226 still exist after three half-lives.
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.If the reaction of 125 g of C6H6O3 reacts in excess of oxygen (O2) and produces 51
g of H2O.
C6H6O3 + 3O2 → 6CO + 3H2O
a) How many grams of the excess reactant left over?
b) What is the percent yield?
If the reaction of 125 g of C₆H₆O₃ reacts in excess of oxygen (O₂) and produces 51. The calculations for the following are:
a. 51 grams.
b. 95.20 %
What is the percent yield?Percent yield is the calculation of the difference between actual and estimated yields.
C₆H₆O₃ + 3O₂ -------> 6CO + 3H₂O
Molar mass of C₆H₆O₃
6 x 12 + 6 x 1 + 3 x 16 = 72 + 6 + 48 = 126 g per mole.
So, 125 grams is 125 / 1 26 moles = 0.992 moles of C6H6O3.
From the equation, we can see that 1 part of C₆H₆O₃ reacts with 3 parts of Oxygen gas to give 6 parts of Carbon Monoxide and 3 parts of water.
So, 1 part = 0.992 moles
Hence, 3 parts of water is 0.992 x 3 = 2.976 moles of H2O.
Molar mass of H2O = 2 x 1 + 1 x 16 = 18 grams per mole.
So, 2.976 moles of H2O has a mass of 2.976 x 18 = 53.568 grams
So, the mass of water that should have been formed = 53.568 g
Thus, the grams of the excess reactant left over is 51 grams.
Percentage yield = (51 / 53.568) x 100 is 95.20 % (approx.)
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Answer:
If the reaction of 125g C6H6O3 REACTS in excess of O2and produced 51g of H2O what is the % yeild
Explanation:
Help me out with this chem problem please
The balanced equation reveals a 3:2 molar ratio between O2 and KCl. Therefore,
(32.0 g O2 g/1 mol O2) (3 mol O2/2 mol KCl) (1 mol KCl/74.5 g KCl) (40.6 g KCl) = 26.2 g O2
What temperature causes the breakdown of KClO3?When heated over 400 °C or in touch with strong acids, it decomposes, emitting poisonous gases such chlorine dioxide and chlorine fumes as well as oxygen. It breaks down into oxygen and perchlorate above the melting point.
Potassium chlorate (KClO3) breaks down into potassium chloride and oxygen gas when heated in the presence of a manganese dioxide catalyst.
The response provided in the query is a decomposition response. A decomposition reaction is one in which a chemical component is broken down into two or more new compounds by the action of heat, light, or electrical energy. Here, potassium chlorate breaks down to produce oxygen gas and potassium chloride.
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For 0.3 hours, karen drove east st a constant velocity. In this time , she drove 30 kilometers. What was her velocity.
Karen drove 0.3 hours to the east at constant velocity for 30 km. The velocity of Karen when she drove towards east is 100 km/ h.
What is velocity?Velocity is defined as a direction of movement of the body or the object.
It is a vector quantity. It is the rate of change of distance and rate of change of displacement.
It is a fundamental concept in kinematic, the branch of classical mechanics that describes the motion of body.
Velocity can be expressed as
Velocity = distance / time
= 30km / 0.3 h
= 100 km/h
Thus, the velocity of Karen when she drove towards east is 100 km/ h.
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An element that can be placed in group 1 or 6 in periodic tables of elements
The alkali metals hydrogen (H), lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (F) are found in Group 1A of the periodic table (Fr).
Why is it known as a periodic table?Because of the orderly arrangement of the elements, it is known as the periodic table. They're arranged in rows and columns, as you'll see. The vertical columns that go from top to bottom and the horizontal rows that travel from left to right are referred to as Periods and Groups, respectively.
Why is the periodic table important?All known elements are grouped together in the periodic table of elements into groups with related properties. As a result, it becomes a vital tool for chemists, nanotechnologists, and other researchers. If you can utilize and understand the periodic table, you can predict how compounds will react.
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An unknown compound is analyzed and found to contain 0.1935 g of carbon, 0.0325 g of hydrogen, and 0.2043 g of fluorine.The molar mass of the compound is 240.23 glmol. a) How many moles of carbon are present in the compound? b) How many moles of hydrogen are present in the compound? c) How many moles of fluorine are present in the compound? d) Determine the empirical formula of the unknown compound. e) What is the molar mass of the empirical formula? What is the molecular formula of the unknown compound?
The molecular formula is [tex]C_{7} H_{21} F_{7}[/tex].
What is the empirical formula?There are several formulas that a compound could have. The empirical formula is the simplest formula of the compound. It is the formula that shows the ratio of the atoms of each of the elements present. The molecular formula shows the number of atoms of each element that is present in the compound. The structural formula is the formula that shows the arrangement of the atoms in the molecule.
Now we want to obtain the empirical formula using the following procedure;
Mass of carbon = 0.1935 g
Number of moles of carbon = = 0.1935 g/ 12 g/mol = 0.016 mole
Mass of hydrogen = 0.0325 g/1 g/mol = 0.0325 moles
Mass of fluorine = 0.2043 g/19 g/mol = 0.011 moles
We now have to divide through by the lowest number of moles to obtain the empirical formula;
C - 0.016 mole/0.011 moles H - 0.0325 moles/0.011 moles F- 0.011 moles /0.011 moles
C – 1 H – 3 F – 1
The empirical formula is [tex]CH_{3} F[/tex]
Molar mass of the empirical formula = 12 + 3 + 19 = 34 g/mol
Molecular formula = 34n = 240.23
n = 240.23/34
n = 7
The molecular formula is [tex]C_{7} H_{21} F_{7}[/tex].
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2 moles of AlCl3 were reacted as shown by the balanced reaction below.
How many moles of MgCl2 formed?
2 AlCl3 + Mg3P2 → 2 AlP + 3 MgCl2
If 2 moles of AlCl₃ reacts as shown in the balanced equation, 3 moles of MgCl₂ will be produced.
How to calculate number of moles?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, aluminum chloride reacts with magnesium phosphate to produce aluminum phosphate and magnesium chloride as follows:
2AlCl3 + Mg₃P₂ → 2AlP + 3MgCl₂
Based on the above balanced reaction, 2 moles of aluminum chloride (AlCl₃) formed 3 moles of magnesium chloride (MgCl₂).
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What is the solubility of sugar, flour, and salt in the following substances: water, hydrogen peroxide,
isopropyl alcohol, mineral oil, and vinegar?
The solubility of the given solutes in the solvents are as follows:
Water: Salt and Sugar dissolves, Flour does not dissolveHydrogen peroxide: Salt and Sugar dissolves, Flour does not dissolveIsopropyl alcohol : Sugar dissolves, Salt and Flour does not dissolveMineral oil: Flour dissolves, Salt and Sugar does not dissolveVinegar: Sugar dissolves, Salt and Flour does not dissolveWhat is solubility of a substance in a solvent?The solubility of a substance in a solvent is the amount of that substance that dissolves in a given volume of the solvent.
The substance that is dissolved in a solvent is known as the solute.
The solubility of a solute in a solvent depends on both the nature of the solute as well as the solvent.
For example, polar substances dissolve in polar solutes but not i non-polar solvents, whereas, non-polar solutes dissolves in non-polar solvents but not in polar solvents. This is known as the principle of like dissolves like.
Considering the given solutes and the solvents to determine the solubility of the solutes in the given solvents:
Water:
Salt and Sugar dissolves in water but Flour does not dissolve in water.
Hydrogen peroxide:
Salt and Sugar dissolves in hydrogen peroxide but Flour does not dissolve in hydrogen peroxide.
Isopropyl alcohol:
Sugar dissolves in isopropyl alcohol but Salt and Flour does not dissolve in isopropyl alcohol.
Mineral oil:
Flour dissolves in mineral oil but Salt and Sugar does not dissolve in mineral oil.
Vinegar:
Sugar dissolves in vinegar but Salt and Flour does not dissolve in vinegar.
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Which of the following protects Earth's atmosphere from solar wind
a. radiative zone
b. hydrogen atoms
c. convection currents
d. magnetosphere
The magnetosphere protects the earth's atmosphere from the solar wind.
Hence, option (d) is correct.
The magnetosphere is the area of spcae, around the earth which is controlled by the magnetic field of the earth.
The magnetosphere is created because of the earth's own magnetic field which is generated from the outer core.
The magnetosphere is made up of plasma having charged particles, mainly electrons and protons,
The magnetosphere stretches from the earth's core out into space. Here it meets solar winds or solar radiation emitted by the sun. The magnetosphere is acting as a shield and protects the earth from harmful solar radiation.
Hence, the magnetosphere protects the earth's atmosphere from the solar wind.
Therefore, option (d) is correct.
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Answer: The answer is magnetosphere
Explanation:
You will get it right.
Combustion reactions release large amounts of energy as heat
and/or light.
TRUE
FALSE
✔ Improve this
Answer:
True
Explanation:
A combustion reaction is when a substance reacts with oxygen and releases a huge amount of energy in the form of light and heat. A combustion reaction always has oxygen as one reactant.
Given a 1 M stock of NaCl, how many mL of stock and how many mL of water you would mix to make 100 mL at 100 mM (0.1 M)??
1. The volume of the stock soluiton needed is 10 mL
2. The volume of water needed is 90 mL
Data obtained from the questionThe following data were obtained from the question:
Molarity of stock solution (M₁) = 1 MVolume of diluted solution (V₂) = 100 mL Molarity of diluted solution (M₂) = 0.1 M Volume of stock solution needed (V₁) =?Volume of stock solution needed (V₁) =?Volume of water needed =?1. How to determine the volume of the stock solution neededM₁V₁ = M₂V₂
1 × V₁ = 0.1 × 100
V₁ = 10 mL
Thus, the volume of the stock solution needed is 10 mL
2. How to determine the volume of water Volume of stock solution (V₁) = 10 mL Volume of diluted solution (V₂) = 100 mL Volume of water =?Volume of water = V₂ – V₁
Volume of water = 100 – 10
Volume of water = 90 mL
Thus, the volume of water needed is 90 mL
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Which option is formed by the process of fusion in stars?
O compounds
Oelectrons
O quarks
Oelements
D. The option that is formed by the process of fusion in stars is elements.
How fusion in stars form elements
When the new star reaches a certain size, a process called nuclear fusion ignites, generating the star's vast energy.
The fusion process forces hydrogen atoms together, transforming them into heavier elements such as;
helium, carbon and oxygen.Thus, the option that is formed by the process of fusion in stars is elements.
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A scientist melted 25 grams of solid gold to form liquid gold. Which statement best describes the mass of the liquid gold?
The mass of the liquid gold is 25 grams because the same number of atoms will be present in the liquid and the solid.
What is Atom?The smallest component of ordinary matter that makes up a chemical element is an atom. Atoms that are neutral or ionised make up every solid, liquid, gas, and form of plasma. Atoms are incredibly tiny, usually measuring 100 picometers across.
The smallest piece of matter that can be divided without sending electrically charged particles flying. It is also the smallest piece of matter with chemical element-like characteristics. As a result, the atom serves as the fundamental unit of chemistry.
According to the given value;
The density will decrease from 19.30 g/cm3 (solid gold room temp) to 17.31 g/cm3 (at melting point). And volume will increase because the atoms will be loosely connected.
The mass of the liquid gold is 25 grams because the same number of atoms will be present in the liquid and the solid.
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A group of students in Shari's class decided to make a human-scale model of the solar system out on the school grounds. The school itself represents the Sun. In model 1 AU = 100 meters (the length of a football field). Using this table, the students figured out where each student representing a planet should stand in interrelation to the school (sun).
All BUT ONE statement describes an advantage of this model of the solar system.
A The human model shows the correct order of the planets, out from the Sun.The human model shows the correct order of the planets, out from the Sun.
B The model allows the students to calculate how long a year is on each planet.The model allows the students to calculate how long a year is on each planet.
C The students have correctly calculated a scaled representation of the distances between all parts.The students have correctly calculated a scaled representation of the distances between all parts.
D The students can infer information about the effects of gravity on each planet.
The statement describes the advantage of this model of the solar system is that The students can infer information about the effects of gravity on each planet. Option D
What is the solar system?The solar system is composed of the sun and the planets. It has to do with a set up in which the sun lies at the center. We call this the heliocentric model of the solar system.
Given that we have taken the school to be the sun which lies at the center of the solar system and the position of the planets have been scaled using 1 AU = 100 meters (the length of a football field).
The only thing that is given in the options that we can not infer from this set up is the fact that; the students can infer information about the effects of gravity on each planet.
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Describe the nucleus in a eukaryotic cell.
Answer:
The nucleus is a double-membraned organelle that contains the genetic material and other instructions required for cellular processes. It is exclusively found in eukaryotic cells and is also one of the largest organelles.
Which of these is OK to wear in the lab?
Long, flowing, loose sleeves
Flip Flops
Bare midriff
Sandals
Long pants
Answer:
long pants
Explanation:
everything else is hazardous, and the long pants will protect your legs.
In this experiment, it takes about 1 microliter to produce a spot 1 mm in diameter. If a solution
contains 5.3 g of a metal ion per L, how many micrograms of the ion are there in one spot? Show the
steps to your work and all the conversion factors with correct units.
alin sa sumusunod ang nagpapahayag ng tunay na pagmamahal batay sa mitong psyche at cupid
which is reactive, carbon with four single bonds of carbon with two single bonds and one double bond?
Answer:
Carbon with two single bond and one double bond is more reactive
What does the mass of an object measure?
A fundamental characteristic of an object, its inertia is quantified by its mass, which is a basic indicator of the volume of substance inside the thing.
What does the word "mass" mean?
In science, mass is a method for measuring inertia, a fundamental property of all matter. In essence, it's the resistance of a mass of matter to changing its direction or speed in reaction to the application of a force.
Why is mass important?
The celebration of the Eucharist, which is the main act of worship in the Roman Catholic Church, takes place during mass. The ecclesiastical Latin formula for the congregation's dismissal is where the word "mass" comes from.
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Which element being oxidized in the following redox reaction 2 KCI3(g) = 2 KCI(g) + 3 O2(g)
Oxygen get oxidized in the following redox reaction 2KCIO₃(g) = 2 KCI(g) + 3O₂(g).
Redox is a kind of chemical response wherein the oxidation states of substrate exchange. Oxidation is the lack of electrons or growth inside the oxidation nation of a chemical or atoms inside it.
An oxidation-reduction reaction is a type of chemical reaction that includes a switch of electrons among two species. An oxidation-reduction response is any chemical response wherein the oxidation number of a molecule, atom, or ion modifications through gaining or dropping an electron.
The time period oxidation turned into used to explain reactions wherein a detail combines with oxygen. for instance, the oxidation of magnesium includes the chemical reaction between magnesium metal and oxygen to shape magnesium oxide.
Left hand side: K = +1; O = -2; Cl = +5
Right hand side: K = +1; Cl = -1; O = 0
here, the oxidation state of O changes from -2 to 0.
Therefore, the oxygen gets oxidized.
Disclaimer:- your question is incomplete, please see below for the complete question.
Which element is oxidized in the following redox reaction?
2KCIO₃(g) = 2 KCI(g) + 3O₂(g)
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What is the volume in mL of a 1.11 carat diamond, given the density of diamond is 3.51 g/mL? (1 carat = 200 mg).
The volume of the 1.11 carat diamond is 63.2 mL.
What is the volume of the 1.11 carat diamond?The volume of the 1.1 carat diamond is determined as follows:
Density = mass/volumevolume = mass/densitydensity of diamond = 3.51 g/mL
mass of 1.11 carat diamond = 200 * 1.11
mass of 1.11 cart diamond = 222 g
volume of 1.11 carat diamond = 222 g/3.51 g/mL
volume of 1.11 carat diamond = 63.2 mL
In conclusion, the volume of the 1.11 carat diamond is obtained from the ratio of the mass and the density of diamond.
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If 0.1375 moles of a something weighs 58.61 g, what is the molar mass of it, in units of g/mol?
Answer:
0.1375 mol of it has a mass of 58.61 g.
One mole of it will have a mass of
0.1375 divide by 58.61
=0.00234601604g (molar mass of compound).
Assignment Summary
In this assignment, you will write and balance a chemical equation. Then, you will use a table of enthalpy
values to calculate the energy change in the reaction. Next, you will create a model of the energy change
in the reaction. Finally, you will write an explanation that describes the energy change in the reaction.
Answer:
the direction of a chemical equation is reversed, the arithmetic sign of its ΔH is changed (a process that is endothermic in one direction is exothermic in the opposite direction).
Explanation:
the direction of a chemical equation is reversed, the arithmetic sign of its ΔH is changed (a process that is endothermic in one direction is exothermic in the opposite direction).A positive ΔHº value represents an addition of energy from the reaction (and from the surroundings), resulting in an endothermic reaction. A negative value for ΔHº represents a removal of energy from the reaction (and into the surroundings) and so the reaction is exothermic.Every chemical reaction occurs with a concurrent change in energy.
The change in enthalpy equals heat at constant pressure.
Enthalpy changes can be expressed by using thermochemical equations.
Enthalpy changes are measured by using calorimetry.What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed? A. ∆H has the same numerical value, and the sign changes.Every chemical reaction occurs with a concurrent change in energy.
The change in enthalpy equals heat at constant pressure.
Enthalpy changes can be expressed by using thermochemical equations.
Enthalpy changes are measured by using calorimetry.What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed? A. ∆H has the same numerical value, and the sign changes.
Please help I need help right now please answer this and I will mark brainliest!!
Use the chemical equation to complete the activity.
2Cu+S→Cu2S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
Answer:
The scientist used the law of Conservation of matter.
Explanation:
This law states the matter cannot be created or destroyed. Matter can however be rearranged.
Answer: The scientist used the law of Conservation of matter.
Explanation:
This law states the matter cannot be created or destroyed. Matter can however be rearranged.
Explanation:
above
