Homework 2
1. A scientist is attempting to check the relative atomic masses on the periodic table. He works
with three different compounds that contain only C and another compound. These are
diatomic compounds with a formula of CX. He finds the following information. If he
assumes the weight of C is 12 what is the weight of the other element and its identity.
Wt C
Wt X
Compound 1
4.2
4.9
Compound 2 3.5
4.67
Compound 3 1.3
3.47
Answers
the concepts of mole and chemical reactions, the element of the three compounds can be found.
compound 1 carbon - Nitrogen CN
compound 2 carbon - Oxygen CO
compound 3 carbon - Sulfur CS
Chemical reactions are expressed in moles of each constituent element. The mole is one of the fundamental quantities of physics and is defined as the amount of matter in 0. 012 kg of carbon 12, in practical form the moles of a given element in a chemical reaction is found with the expression
n = m / Pm
where n is the number of moles, m the mass of the element and PM the molecular weight (taken from the periodic table) of the element.
Let's apply to our compounds as the chemical formula is CX, there is an atom of each element, let's look for the moles of carbon.
compound 1
mass of coal 4.2
carbon mole
n_C = 4.2 / 12
n_C = 0.35 mol
as in the chemical reaction there is an atom of each element, there are also 0.35 moles of the unknown element, let's find its molecular weight (PM)
PM = m / n
PM = 4.9 / 0.35
PM = 14 gr / mol
When reviewing the periodic table this weight corresponds to Nitrogen(N)
The elect is Nitrogen
compound 2
carbon mass 3.5
carbon moles
n_C = 3.5 / 12
n_C = 0.29167
moles of unknown element n = 0.29167
mass of unknown element m = 4.67
molecular weight
PM = 4.67 / 0.29167
PM = 16 gr / mol
Checking the periodic table corresponds to the element Oxygen (O)
Compound 3
carbon mass 1.3
carbon moles
n_C = 1.3 / 12
n_C = 0.1083
moles unknown element n = 0.10833
mass unknown element m = 3.47
PM = 3.47 / 0.10833
PM = 32 gr / mol
In the periodic table the element Sulfur (S) has this molecular weight
Using the concepts of mole and chemical reactions, the elements of the three compounds can be found.
compound 1 carbon - Nitrogen CN
compound 2 carbon - Oxygen CO
compound 3 carbon - Sulfur CS
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Related Questions
Pure substances can be elements or compounds. An element is a form of matter that cannot be broken down by chemical reactions into simpler substances. A compound is a substance composed of two or more different types of elements ,chemically combined in a fixed ratio. 2.(a) Elements and compounds are called as pure substances because it is made up of _________________ *
a.same kind of atoms or molecules
b. different kinds of atoms or molecules
c.heterogeneous mixtures
d.solutions
Answers
Answer:
a.same kind of atoms or molecules
? Is a scientist who is studying cancer with the
goal of finding an effective treatment doing
pure research or applied research?
Answers
A scientist who is studying cancer with the goal of finding an effective treatment is doing applied research.
Applied research refers to scientific investigations that are conducted with the specific purpose of solving practical problems or improving existing technologies. In the case of cancer research, the scientist is aiming to find a treatment that can be directly applied to patients in order to combat the disease.
In contrast, pure research, also known as basic or fundamental research, is conducted to gain a deeper understanding of a particular phenomenon without any immediate practical application in mind. Pure research aims to expand scientific knowledge and explore new theories or concepts. While pure research may indirectly contribute to the development of applied research, its primary goal is to advance our understanding of the natural world.
In summary, a scientist studying cancer with the goal of finding an effective treatment is engaged in applied research, as they are conducting research with the intention of solving a specific problem and developing practical solutions for the benefit of cancer patients.
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In which way are the scientific method and the design process the same?
Answers
Answer: A lot of the steps are the same.
Explanation:
Scientific Method
State your question
Do background research
Formulate your hypothesis, identify variables
Design experiment, establish procedure
Test your hypothesis by doing an experiment
Analyze your results and draw conclusions
Communicate results
Steps of The Scientific Method
Engineering Design Process
Define the problem
Do background research
Specify requirements
Create alternative solutions, choose the best one and develop it
Build a prototype
Test and redesign as necessary
Communicate results
Steps of The Engineering Design Process
which picture shows the particles in a compound?
picture I and II
picture I
picture III and IV
picture II
Answers
hi <3
compound are 2(or more) elements combined together
thus your answer will be picture I
hope this helps <3
PLEASE, QUICKLY!!!!!!!!!
Which statement correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant?
A. The relationship is directly proportional; as temperature increases, volume decreases in the same way.
B. The relationship in inversely proportional; as temperature increases, volume increases in the same way.
C. The relationship is inversely proportional; as temperature increases, volume decreases in the same way.
D. The relationship is directly proportional; as temperature increases, volume increases in the same way.
Answers
The statement that correctly describes the relationship between the volume of a gas and its temperature, in Kelvin, assuming pressure is held constant is "he relationship is directly proportional; as temperature increases, volume increases in the same way."
In mathematics, a direct proportion means that the two variables increase or decrease simultaneously. As one increases the other increases and vice versa.
According to Charles law; the volume of a given mass of gas is directly proportional to its volume at constant pressure.
As a result of this law, the correct statement is option D; The relationship is directly proportional; as temperature increases, volume increases in the same way.
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Please help me please
Answers
Answer:
Hope this helps.
Explanation:
See the picture. Hope it helps. Sorry if i was incorrect.
List the steps of the scientific method
Easy points, just don't be annoying.
Answers
Answer:
•1. Make an Observation
•2. Ask a question about ____
•3. Make a hypothesis (educated guess)
•4. Make a hypothesis-based prediction
•5. Test your hypothesis
•6. Graph the results and Iterate.
Answer:
The steps of the scientific method are:-
●Report the Results.
●Ask a Question.
●Test the prediction.
●Make an observation.
●Form a hypothesis, or testable explanation.
●Make a prediction based on the hypothesis.
Why are intensive properties useful for identifying a substance?
A.They do not depend on the amount of substance you have.
B.They are chemical properties.
C.They are physical properties.
D.They describe the amount of substance you have.
Answers
The intensive properties are useful for identifying a substance because it does not depend upon the amount of substance present in the sample.
The points regarding properties are the following:
The intensive properties are defined as the properties which do not depend on the amount of the substance present in the matter but depend only on the type of the matter.The colour, solubility, texture, etc. are the intensive properties. •The properties which depend upon the amount of the substance present in the sample is called the extensive properties.The mass, density etc. are the extensive properties.Therefore, the correct answer is the A. They do not depend on the amount of substance you have.
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A galvanic cell is constructed of one half cell in which a silver wire is placed into a 1.00 Maqueous solution of silver nitrate and the other half cell is made of a zinc wire in a 1.00 M aqueous solution of zinc nitrate. calculate gibbs free energy
Answers
Answer:
https://www.plps-k12.org/site/handlers/filedownload.ashx?moduleinstanceid=2482&dataid=3257&FileName=Ch%2017%20Electrochemistry%20Practice%20Problems%20I%20-%20key.pdf
Explanation: This is all the answers just go to this link to help is a bunch of pages to help and with answers on them too! Can I get brianliest plz
a sample of gas is originally at 12°C is heated so it's total kinetic energy doubles . what is the new temperature of the sample
Answers
wE know
[tex]\boxed{\sf E\propto T}[/tex]
Hence If Kinetic energy is doubled Temperature will also be doubled.
[tex]\\ \sf\longmapsto T=12(2)=24°C[/tex]
The kinetic energy is directly proportional to the temperature. Hence, as kinetic energy doubles, the temperature become approximately 297.15°C.
What is kinetic energy ?Kinetic energy is the energy generated by virtue of the motion of the substance.
Assuming the pressure and volume of the gas sample are constant, the temperature of an ideal gas is directly proportional to its average kinetic energy. When the total kinetic energy of the gas doubles, its temperature will also double.
To calculate the new temperature of the sample, we can use the following equation:
(T2/T1) = (E2/E1)
where T1 is the initial temperature, E1 is the initial total kinetic energy, T2 is the final temperature, and E2 is the final total kinetic energy.
Since the total kinetic energy has doubled, E2 = 2E1. Substituting this into the equation, we get:
(T2/T1) = 2
Multiplying both sides by T1, we get:
T2 = 2T1
Substituting the initial temperature T1 = 12°C + 273.15 K = 285.15 K, we get:
T2 = 2 x 285.15 K = 570.3 K
Converting the final temperature from Kelvin to Celsius, we get:
T2 = 570.3 K - 273.15 = 297.15°C
Therefore, the new temperature of the gas sample is approximately 297.15°C.
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1-How does the Law of Conservation of Energy explain why ice cubes melt in water?
2-What are the two differences between mass and weight?
3-Why does an object’s weight change on the moon but its mass stays the same?
4-Explain how two objects that have the same mass can have different densities.
5-How can you tell if a mixture is homogeneous (solution) or heterogeneous (not a solution)?
6-Identify each of the following examples below as either a homogeneous mixture (solution) or a heterogeneous mixture.
7-What are 3 methods you can use to separate a mixture? Give an example of each.
8-What is the difference between an atom and a molecule?
9-Is a compound a mixture or a pure substance?
10-How are elements arranged on the Periodic Table? by increasing
atomic number.
Answers
Answer: 1.The water molecules in the liquid phase have more energy than the molecules in the solid phase. The reason that the ice melts is that some of the energy in the water is transferred to the ice – this provides the heat necessary for the transition from the solid to liquid phase
13. Find the total number of atoms present in the following molecules. a. 5 H₂O b. Zn Cl₂
Please
Answers
Answer:
5H²O= 23
ZnCl²=135
have a great day
a. 5 H₂O
b. Zn Cl₂
What is the rate law?
Answers
Answer: B
Explanation:
The rate law is the mathematical equation that describes how reactant concentration changes as a function of time. A law such as "Rate = k*[A]*[B]" means that, for each liter-equivalent of the reactant(s) A, there are k liters of reactant B. The law also dictates the molarity (and thus partial pressure) for each component in solution.
Difference between heavy chemicals and fine chemicals
Answers
Answer:
Fine chemicals are used as starting materials for specialty chemicals, particularly pharmaceuticals, biopharmaceuticals and agrochemicals. ... The term "fine chemicals" is used in distinction to "heavy chemicals", which are produced and handled in large lots and are often in a crude state.
Explanation:
What mass of oxygen is needed to complete the combustion of 8.80 x 10^-3 g of methane?
Answers
Explanation:
The chemical reaction that describes the combustion of methane is
[tex]\text{CH}_4 + 2\text{O}_2 \rightarrow \text{CO}_2 + 2\text{H}_2\text{O}[/tex]
We need to convert the mass of methane to moles:
[tex]0.00880\:\text{g} × \dfrac{1\:\text{mol CH}_4}{16.04\:\text{g}}[/tex]
[tex]= 5.49×10^{-4}\:\text{mol CH}_4[/tex]
Now use the molar ratios to determine the amount of oxygen used during the combustion:
[tex]5.49×10^{-4}\:\text{mol CH}_4×\left(\dfrac{2\:\text{mol O}_2}{1\:\text{mol CH}_4}\right)[/tex]
[tex] = 0.00110\:\text{mol O}_2[/tex]
Converting this to grams, we find that the mass of oxygen is
[tex]0.00110\:\text{mol O}_2×\left(\dfrac{15.999\:\text{g O}_2}{1\:\text{mol O}_2}\right)[/tex]
[tex] = 0.0176\:\text{g O}_2[/tex]
How do scientists take instruments for measurement up to about 100,000 feet of
elevation?
A.jet aircraft
B.rockets
C.satellites
D.weather balloons
Answers
Answer:B
Explanation: i got it right
The scientists use weather balloons to measure up to about 100,000 feet of elevation. The correct option is D.
What is weather balloon?A weather balloon, also known as a sounding balloon, is a balloon that carries instruments aloft to transmit data on atmospheric pressure, temperature, humidity, and wind speed using a small, disposable measuring device known as a radiosonde.
Weather balloons can travel up to 24 miles (39 kilometres) before bursting, and a payload can land (via parachute) up to 75 miles (120 kilometres) away, depending on wind conditions at the launch site.
If the balloon is flexible, it will expand as it rises to lower air pressure altitudes.
To prevent them from popping, weather balloons are only partially filled when released.
Thus, the correct option is D.
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Which of the following best describes an electron orbital? (electron orbital)
a) A circular path in which an electron "orbits” around a nucleus.
b) A location around the nucleus in a sphere where the electron is likely to be located.
c) An elliptical path around the nucleus.
d) The nucleus
Answers
Answer:
D
Explanation:
and compound is a substance made of two or more chemicals that are chemically joined in a specific combination most matter is formed of ____
Answers
Answer:
elements
Explanation:
possibly elements
Determine the molecular and empirical formulas of the following:
a. the organic solvent benzene, which has six carbon atoms and six hydrogen atoms.
b. the compound silicon tetrachloride, which has a silicon atom and four chlorine atoms and is used in the manufacture of computer chips.
c. the reactive substance diborane, which has two boron atoms and six hydrogen atoms
d. the sugar called glucose, which has six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answers
Answer:
the answer is b im pretty sure
Explanation:
sorry if im wrong
The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex]. The empirical formula is also known as the simplest basic formula.
What is molecular formula ?A molecular formula is indeed a formula derived with molecules that corresponds to the total number of distinct atoms in the molecule of a chemical. A subscript inside a molecular formula denotes the number for each type of atoms in the substance's molecule.
The empirical formula provides the most basic formula for something like a compound, defined by the ratio between subscripts of the formula's smallest entire number of constituents. It is also known as the simplest basic formula. An empirical formula is the formula of a material given with the least integer subscript. The empirical formula for benzene is CH. The molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
Therefore, the molecular formula for benzene is C[tex]_6[/tex]H[tex]_6[/tex].
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A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
Answers
Complete Question
A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
-What is the volume of the pycnometer (mL)
We have that the volume of the pycnometer in mL is
[tex]V=9.111mL[/tex]
From the Question we are told that
Pycnometer mass of [tex]m_p=27.056 g.[/tex]
Temperature [tex]T=25 \textdegree[/tex]
Pycnometer filled with distilled water [tex]m_{pf}= 36.773 g[/tex]
Apparatus weighed [tex]w=41.451 g[/tex]
Density of water [tex]\rho= 0.99704 g/mL[/tex]
Generally the equation for Density is mathematically given as
[tex]\rho=\frac{mass}{Volume}[/tex]
Since pycnometer is filled with water its volume can be defined by the volume of water in it
Therefore
Mass of water Pycnometer filled with distilled water-Pycnometer mass
[tex]M_w=36.773 -27.056\\\\M_w=9.084g[/tex]
Hence
[tex]V=\frac{9.084g}{0.99704 }[/tex]
[tex]V=9.111mL[/tex]
in conclusion
The volume of the Pycnometer in mL is
[tex]V=9.111mL[/tex]
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If the sum of the last
number and the middle
number of three consecutive
integersis is 71, then the
Least (smallest) number
mumber must be
Answers
Answer:
number must be 0000.999
What is true of an element that is oxidized?
It increased in electronegativity.
It decreased in electronegativity.
It gained electrons.
It lost electrons.
Answers
Answer:
When an element is oxidized, it loses electrons
Answer:
The last option is the correct answer.
Explanation:
When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. This is the basis of redox reactions.
However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons. Meanwhile, a reducing agent reduces something else, and gets oxidized in the process, losing its own electrons.
What's the major difference between carbon and other group IV elements, excluding allotropy
Answers
Answer:
Carbon has an ability of catenation which other group IV elements lack.
Explanation:
Catenation is the ability for an element to form multiple bonds with other elements leading rise to long chains of compounds.
An example is organic compounds.
[tex].[/tex]
How do I calculate the volume?
Answers
Answer:
2477.6 cm³
Explanation:
Volume = length x width x height
Label in cm³
How many grams of tin would occupy 5.5 cm^3, if it had a density of 7.265 g/cm^3
Answers
Answer:
Density=Mass/Volume
7.265=M/5.5
Mass=7.265×5.5g
=39.9575g
Mrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must separate the mixture into pure sand, pure iron filings, and pure salt using only the physical properties of each component using the following supplies:
bar magnet
filter paper
plastic funnel
water
What is the BEST procedure for the students to follow in order to separate the mixture?
Answers
A mixture can be separated by looking at the physical properties of the components of the mixture.
Since salt is soluble in water, water can be added to the mixture to dissolve the salt.
The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.
The solution is filtered to separate the sand from the salt solution.
Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.
Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.
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Answer:
is it a b c or d
Explanation:
Chloric acid (HCIO3 is a neutral compound. The chlorine atom has what oxidation number?
Answers
Answer: 1
Explanation: one
Chloric acid is a neutral compound and an oxoacid with strong oxidizing power. In the compound (chloric acid), chlorine has an oxidation number of +5. Thus, option c is correct.
What is the oxidation number?The oxidation number is defined as electrons that are transferred by accepting and donating in a chemical bond formation. They denote the atoms that have gained and donated electrons by the positive and negative states.
As chloric acid is a neutral compound, the equivalent will be zero. The oxidation state of the hydrogen atom is generally taken as 1 and that of oxygen as -2 as it requires two more electrons in its valence shell.
The oxidation number will be estimated as,
HCIO₃ = 0
+1 + x + 3(-2) = 0
+1 + x - 6 = 0
x = + 6 - 1
x = + 5
Therefore, option c. chlorine has a +5 oxidation number in chloric acid.
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write the symptoms of Tuberculosis
Answers
Answer:
Hi, There! Your Answer is Below!
Coughing for three or more weeks.
Coughing up blood or mucus.
Chest pain, or pain with breathing or coughing.
Explanation:
Tuberculosis (TB) is a disease caused by germs that are spread from person to person through the air. TB usually affects the lungs, but it can also affect other parts of the body, such as the brain, the kidneys, or the spine. A person with TB can die if they do not get treatment.
Would overheating be a stimulus or a
response?
Stimulus
Response
Answers
Answer:
stimulus response
Explanation:
its stimulus response
what is Planck's constant ??
Answers
Planck's constant =
6.62607004 × 10-34 m2 kg / s
Explanation:
Step by Step explanation
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency. Wikipedia
Answer:
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency.
Plancks constant =
6.62607004 × 10-34 m2 kg / s
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