The law that explains the given observation of the formation of carbon monoxide and carbon dioxide is the law of multiple proportions.
The correct answer choice is option C.
What is the statement of the law of multiple proportions?The law of multiple proportions states that when an element combines with another element B to form more than one compound, the mass in which the different masses of A combine with a fixed mass of B are in simple multiple multiple ratios.
The law of multiple proportions can be explained below using C and O:
C combines with O to form carbon monoxide and carbon dioxide respectively.
Carbon monoxide can be formed by reacting 12 grams of carbon with 16 grams of oxygen.
However, to form carbon dioxide, 12 grams of carbon must react with 32 grams of oxygen.
Ratio of O in carbon monoxide and carbon dioxide = 16 : 32
Ratio of O in carbon monoxide and carbon dioxide = 1 : 2
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A sample of nitrogen gas is at a pressure of 625 kPa and a volume of 40 cm³.
The volume of the gas is doubled while the temperature remains constant.
Calculate the pressure of the new volume of nitrogen gas.
The Pressure of the new volume of nitrogen gas, P₂= 312.5 kPa.
In a sample of nitrogen gas, given Pressure P₁= 625kPa and Volume V₁ = 40 cm³
In final conditions, V₂ is doubled = 80 cm³
Let Final pressure be P₂.
Since, temperature remains constant consistent with the Boyle's Law that states the absolute pressure exerted by a given mass of an ideal gas is inversely proportional to the volume it occupies if the temperature and amount of gas remain constant.
Hence, P₁V₁ = P₂V₂
∴ 625 ×40 = P₂ ×80
[tex]P_{2} = \frac{625*40}{80}[/tex]
P₂ = 321.5 kPa
Hence, The final pressure obtained of nitrogen gas when volume is doubled at constant temperature is 312.5 kPa.
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( GIVING BRAINLY!! )
Student Exploration: Determining Density via Water Displacement
Directions: Follow the instructions to go through the simulation. Respond to the questions and
prompts in the orange boxes.
Vocabulary: Archimedes' principle, density, displacement, mass, volume
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
A ship floats by an iceberg as shown.
1. Based on the picture, which object is denser, the
iceberg or the ship?
2. How do you know?
Answer:
Iceberg
The boat floated higher on water than the iceberg.
A swimming team wants to select one of three fabrics for their new swimsuits. Each fabric is made of
a different material. The team decides to do the following experiment:
They cut the same size pieces from each fabric and wet each piece with the same amount of water.
They hang the pieces in the sunlight, and they check every two minutes to see if any of the pieces are
dry.
What can the team find out about the different fabrics from doing just this experiment?
A.If the type of fabric affects how long, it takes the pieces of fabric to dry
B.If the amount of water affects how long, it takes the pieces of fabric to dry
C.If the amount of water and the amount of light affect how long it takes the pieces of fabric
to dry.
D.If the type of fabric, the amount of water, and the amount of light affect how long it takes
the pieces of fabric to dry.
The team's discovery on the various fabrics from conducting just this experiment is that A. The length of time it takes for the fabric to dry may vary depending on the type of fabric.
What can the team find out about the fabrics from doing just this experiment?It was clear from the information that the swimming team wanted to choose one of three textiles for its new swimsuits. It should be emphasized that each fabric in this instance was manufactured from a unique material.
Each fabric was wetted with water in order to conduct the experiment, and identical-sized pieces were cut out to demonstrate this.
As a result, the experiment can demonstrate if the type of fabric impacts how long it takes for the fabric pieces to dry. As a result, given the information, option A is the best choice.
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what is a good r f value in order to ensure that a compound will elute over a reasonable timeframe? around 0.5 close to 1 close to zero around 0.7 around 0.3
Around 0.3 is a good r f value in order to ensure that a compound will elute over a reasonable timeframe and is denoted as option E.
What is rf value?
This is referred to as retar-dation factor and it is commonly used in chromatography. It is the ratio of the solute's distance traveled to the solvent's distance traveled.
The rf value which shows that a compound will elute over a reasonable timeframe is 0.3 which is because if it is too low, the compound won't elute and if it is too high then it will run through the column too quickly.
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Krypton has six stable isotopes. How many neutrons are in the most abundant isotope of krypton according to the mass spectrum in Figure P2.10? Write the AX form of the symbol of that isotope.
The number of neutrons in the most abundant isotope of krypton according to the mass spectrum is 48.
What are neutrons?The neutron is a subatomic particle with the sign n or n0, a neutral charge, and slightly more mass than a proton. Atoms' nuclei are made up of protons and neutrons. Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle. The name of the particle comes from the fact that it is electrically neutral and devoid of charge. The densest particles are neutrons.
A category of a subatomic particle having a positive charge is the proton. The strong nuclear force holds the protons together in the atom's nucleus. A subatomic particle with no charge is called a neutron (they are neutral)
You can find out how many protons, neutrons, and Z an isotope has in its nucleus by looking at its mass number A. Z is determined by the atomic number.
A = Z + number of atoms
krypton-84 So
A = 84
Number of neutrons
A - Z
= 48
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Which object exerts the most friction?
Responses
piece of smooth glass
piece of smooth metal
piece of rough sandpaper
ice
Answer:
A piece of rough sandpaper
Explanation:
Since sandpaper is rough, it exerts more friction, whereas the other options are smooth so they exert less/no friction.
how can a catalyst be recognized in a mechanism? select one: the catalyst is used and then regenerated in a later step. the catalyst is not an organic compound. the catalyst is created and then used in a later step. the catalyst does not appear in the mechanism.
The catalyst be recognized in the mechanism if the catalyst is used and then regenerated in a later step.
What is catalyst?
The process of catalysis involves introducing a catalyst to a chemical reaction to increase the speed of reaction. Catalysts are not destroyed during the reaction and are unaffected by it. Very little amounts of catalyst are frequently sufficient if the reaction proceeds quickly and the catalyst recycles quickly.
Chemical reactions and the movement of reactants and products both take place during the catalyst regeneration process. The diffusion resistance of oxygen into the pores, according to some research (such as Müller et al. (2010)), has a significant impact on the actual pace of coke combustion. Additionally, according to Tang et al. (2004), the coke concentration profile in a catalyst particle during combustion may not be uniform.
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state the number of electrons in each shell of an n14 atom in the ground state
The number of electrons in each shell of an N-14 atom in the ground state is 7.
The N-14 atom is nitrogen isotope. It has seven protons and seven neutrons. N-14 is a neutral atom having seven electrons. An atom's first shell has only two electrons which occupies an s orbital.
The total number of neutrons which are present in the nucleus are equal to the difference among the atomic number and mass number of an atom.
The nitrogen-14 isotope is having mass number as 14 and an atomic number as 7.
Nitrogen-14 is one of two stable isotopes of nitrogen which are non-radioactive. It makes about 99.63% of nitrogen which is naturally present. Nitrogen-14 is stable nuclides which have both an number of seven protons and seven neutrons. It is the only one which forms up more than half of its element.
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A wilting flower placed in water will be revived as water pressure in the plant cells increases. This change is brought about as a result of what process?.
A wilting flower placed in water will be revived as water pressure in the plant cells increases. This change is brought about as a result of endosmosis.
Wilting means the loss of rigidity of the parts of the plant which are non-woody. This happens when the turgor pressure in the non-lignified cell declines toward zero, as a consequence of a lesser amount of water in the cells. If the concentration of water inside the cell is lower than that of the medium surrounding the cell, i.e. if the solution is very dilute. In this case, endosmosis will occur, the cell will get water by osmosis and the cell comes to be turgid.
The point at which the membrane of the cell pushes against the cell wall is called turgidity. This takes place when the turgor pressure is high. Now, to overcome wilting or increase the turgor pressure in cells, there are certain things to be done like supplying water, increasing the relative humidity of the surrounding, and by doing measures to stop transpiration, such as applying antitranspirants.
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Mass and weight
Answer only!
Weight Doesn't change with location. (will NOT change if you take an object to Mars).
weight DOES change with location. (will change if you take an object to the Moon.
Mass Is a measure of amount of Matter in an object. Is a measure of the pull of Gravity on an object.
Weight Is measured with a scale,
Mass Is measured with a triple beam balance.
Mass Is used to calculate Density.
What is triple beam balance?The triple beam balance is an instrument used to measure mass very precisely. Such devices typically have a reading error of ±0.05 grams. Its name refers to its three beams, where the middle beam is the largest, the far beam of medium size, and the front beam the smallest.
The triple beam balance is a typical instrument used to measure the mass of various objects. It consists of three beams, each of which is provided with a single sliding weight that has a size corresponding to the gradations of the notched scale on each beam..
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how is the elements period related to the number of energy levels over which it’s electrons are spread
Answer: The highest-level numbers are 1 through 7, so the electrons in the atom respond to the row inside the periodic table so where the atoms are supposed to belong.
Explanation:
Element 115 was first created in Russia in 2003, but the International Union of Pure and Applied Chemistry didn’t announce it as a new element until it was created again in Germany in 2013. Suggest why the IUPAC requires an independent confirmation of the discovery of an element.
Answer:
moscovium
Explanation:
The IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.
What is IUPAC name?IUPAC name is defined as a nomenclature based on designating the longest single-bond-connected chain of carbons in a molecule, whether it is a continuous chain or a ring. The official naming guidelines are used to give organic compounds a standardized name known as the IUPAC nomenclature. Contrarily, common names are older, unofficial names given to organic compounds; yet, they are occasionally employed.
The names' suffixes reflect and uphold historical and chemical consistency as well: "-ium" for elements 113 and 115, as well as for all newly discovered elements in groups 1 to 16, "-ine" for element 117, which belongs to group 17, and "-on" for element 118, which is a member of group 18. The half-life of the most stable isotope of Moscovium, Moscovium-289, is around 220 milliseconds.
Thus, the IUPAC requires an independent confirmation of the discovery of an element because with the help of IUPAC name we can easily determine the chemical name of the elements.
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while starting a car, a lead acid battery converts 0.63 grams of pb (207.2 g/mol) at the anode into pbso4. if a current of 0.140 a is used to recharge the battery, how long will recharge take?
Based on the number of electrons required and the strength of the electric current, we can calculate that the time needed to recharge the battery will be 1 hour, 9 minutes, and 23 seconds.
First, we calculate the number of moles of lead oxidized to lead(II) sulfate.
n = m/M = 0.63 g / 207.2 g/mol = 0.00304 mol
Then, we calculate the number of electrons needed to reduce this amount of lead(II) back into the elemental lead (each lead(II) ion requires two electrons):
[tex]N = 2 electrons * 0.00304 mol * 6.02 *10^{23} mol^{-1} = 36.6 * 10^{20} electrons[/tex]
Now that we know the number of electrons required, we can divide that amount by the strength of the electric current used to calculate the time required to recharge the battery:
[tex]t = N / I = 36.6*10^{20} electrons / 0.140 A = 36.6*10^{20} electrons / 0.140 * (6.28*10^{18} electrons/s) = 4163 s[/tex]
Because 1 hour has 3600 seconds, and a minute has 60 s, the time required will be 1 hour, 9 minutes, and 23 seconds.
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Given the following equation, cu +2 agno3 -> cu(no3)2 + 2ag if 89.5 g of silver is produced, how many grams of cu reacted? conversion factors: 1 mole ag=107.87 g ag 1 mole cu= 2 mole ag 1 mole cu = 63.55g cu
If 89.5 grams of silver is produced, 105.45 grams of Cu reacted.
The Chemical equation is
Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag
The equation is balanced,
89.5 grams of Silver is produced in the reaction.
It is asked that how much Cu will be produced.
The amount of Copper can be calculated by using mole concept,
From the reaction,
When 1 moles of Copper Reacts, 2 moles of Ag are formed.
So, we can say,
Mole of Cu (n) = 2 x Moles of Ag
Mole of a compound can be found by using the formula,
Moles = Given mass of compound/Molar mass of the compound
So,
n = 2 x 89.5/107.87 moles
n = 2 x 0.82 moles
n = 1.64 moles.
Moles of Copper are 1.64.
So, the mass of Cu reacted will be
1 mole Cu = 63.55 grams
1.64 moles Cu = 1.64 x 63.55 grams
1.64 moles of Cu = 105.45 grams.
To produce 89.5 grams of silver, 105.45 grams of Copper would have reacted.
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Gina made a poster for plastic recycling week and included this information on her poster:
A 2-column table with 3 rows. The first column labeled natural has entries cellulose, rubber tires, D N A. The second column labeled synthetic has entries plastic, starch, nylon.
What corrections should Gina make? Check all that apply.
Gina should put “cellulose” under “Synthetic.”
Gina should put “plastic” under “Natural.”
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
Gina should put “DNA” under “Synthetic.”
Gina should put “nylon” under “Natural.”
The correct statement among the options is that
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
What is a natural polymer?A polymer is a natural polymer if the polymer is only composed of the compounds that occur in nature. We know that there are several polymers that occur in nature and a lot of these naturally occurring polymers are also known to have biological origin and can even be found in the body of organisms as it were.
We know that a polymer is composed of small molecules that come together. These small molecules that come together are what we call the monomers that compose the polymer.
A polymer is synthetic if it is composed of the compounds that do no occur in nature. These are the polymers that are compose of the monomers that may be produced in the laboratory or are the products of other industrial process.
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Answer:
C & D
Explanation:
Gina should put “rubber tires” under “Synthetic.”
Gina should put “starch” under “Natural.”
An experiment was designed to test the hypothesis that peanuts have more energy than a chip. The experiment determines calorimetry of the peanut and the chip, using water to capture the energy of the samples when they were burned. A 10 g sample of each type of food was burned underneath a metal can that held 50 g of water. A thermometer captured how much the temperature of the water increased. The water increased by 7 degrees for the peanut and 3 degrees for the chip. What conclusion can be drawn?
The chip has more energy than the peanut.
The peanut has more energy than the chip.
The experiment was flawed because more than one variable was being tested.
The peanut and the chip have the same amount of energy.
Since the water increased by 7 degrees for the peanut and 3 degrees for the chip, the conclusion would be that the peanut has more energy than the chip.
CalorimetryCalorimetry is the science of measuring the quantity of energy, usually in the form of heat, that is released during a reaction.
In this case, the energy released by the peanut and the chip were measured using calorimetry. The energy released was captured by the water and helps raise the temperature of the water.
The more energy released by the substances, the more the temperature of the water is raised.
Thus, since the peanut raised the temperature of the water by 7 degrees while the chip was only able to raise it by just 3 degrees, one can effectively conclude that the peanut has more energy than the chip.
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please help me i need it tomorrow
Answer:
Wave length
Explanation:
Is the distance between each wave of and wider it is apart the less energy the wavelength contains.
a second order reaction has a rate constant of 0.0796 m-1s-1 at 1010 k and a rate constant of 0.0910 m-1s-1 at 1210 k. calculate the activation energy for the reaction in kj/mol. r
Using the Arrhenius equation we can calculate the activation energy based on two reaction rate constants and respective absolute temperatures.
The order of the reaction is irrelevant for this calculation. The reaction rate constant is connected to the activation energy through the Arrhenius equation:
[tex]ln(\frac{k_{2} }{k_{1} } ) = \frac{-Ea}{R} (\frac{1}{T_{2} }-\frac{1}{T_{1} } )\\[/tex]
Where k1 and k2 are the rate constants (0.0796 [tex]M^{-1} s^{-1}[/tex] and 0.0910 [tex]M^{-1} s^{-1}[/tex], respectively), T1 and T2 are absolute temperatures at which the reactions are performed (1010 K and 1210 K, respectively), Ea is the activation energy and R is the universal gas constant (8.314 J/Kmol). If we plug our known values into this equation, we get:
[tex]ln(\frac{0.0910}{0.0796} )=\frac{-Ea}{R} (\frac{1}{1210K}-\frac{1}{1010K})[/tex]
[tex]0.1338 = \frac{1.637*10^{-4} Ea}{8.314 J/Kmol}[/tex]
From this, we can calculate Ea:
[tex]Ea = \frac{0.1338 *8.314 J/Kmol}{1.637*10^{-4} K^{-1} } = 6795 J/mol[/tex]
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what is a differentiate solution, colloid, suspension?
Answer:
Between genuine solutions and suspensions, colloids solutions and suspensions represent a middle ground. The colloid solution's solvent-dispersed particles' diameters range from 10 to 2000 A. Milk and butter are examples
the titration of 25.0 mlml of an iron(ii) solution required 18.0 mlml of a 0.175 mm solution of dichromate to reach the equivalence point. what is the molarity of the iron(ii) solution?
According to the given statement the molarity of the iron(ii) solution is 0.72 M.
What is a molarity?Molarity (M), which is determined by dividing the solute's mass in moles by the the solution's volume in liters, is the most widely used unit to represent solution concentration: litres of solution/moles of salt equals M. One liter of a solution with a 1.00 molar concentration (1.00 M) contains 1.00 moles of solute.
Briefing:Volume of iron(II) solution (V₁) = 25.0 mL = 0.025 L
Molarity of iron(II) solution (M₁) = ?
Number of moles of iron(II) solution (n₁) = ?
Volume of dichromate solution (V₂)
= 18.0 mL
= 0.018 L
Molarity of dichromate solution (M₂) = 0.175 M
Number of moles of dichromate solution (n₂) = ?
Molarity of dichromate solution is given as:
M[tex]_2[/tex] = n[tex]_2[/tex]/V[tex]_2[/tex]
n[tex]_2[/tex] = M[tex]_2[/tex] * V[tex]_2[/tex]
= .175 * 0.018
= 3.15 * 10^-3
Now, let us write the complete balanced reaction for the given situation.
So, the complete balanced equation is given below.
[tex]$6 \mathrm{Fe}^{2+}(a q)+\mathrm{Cr}_2 \mathrm{O}_7^{2-}(a q)+14 \mathrm{H}^{+}(a q) \rightarrow 6 \mathrm{Fe}^{3+}(a q)+2 r^{3+}(a q)+7 \mathrm{H}_2 \mathrm{O}$[/tex]
From the equation, it is clear that, 1 mole of dichromate is required for 6 moles of iron(II) solution.
To find the number of moles of iron(II) solution.
1 mole of dichromate = 6 moles of iron(II)
∴ n₂ moles of dichromate = 6n₂ moles of iron(II)
= 6 * 3.15 * 10⁻³ = 0.0189 mol Fe²⁺
So, 0.016 moles of iron(II) is needed. Therefore,
Now, molarity of iron(II) solution is given as:
Molarity = Moles ÷ Volume
M[tex]_1[/tex] = n[tex]_1[/tex]/v[tex]_1[/tex]
M[tex]_1[/tex] = 0.018/0.025 = 0.72 M
The molarity of the iron(II) solution is 0.72 M.
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no(g) so3(g) ⇌ no2(g) so2(g) a reaction mixture initially contains 0.86 atm no and 0.86 atm so3. determine the equilibrium pressure of no2 if kp for the reaction at this temperature is 0.0118.
If Kp for the reaction at this temperature is 0.0118, then NO₂'s equilibrium pressure is 0.084 atm.
What is equilibrium pressure ?The equilibrium will move to the part of the reaction where there are less moles of gas as pressure builds up. The equilibrium will move toward the reactant side where there are more gas molecules when the pressure is decreased.
Briefing:NO(g) + SO₃(g) → NO₂(g) SO₂(g)
Initial: 0.86 0.86 0 0
Change: -x -x +x +x
Equilibrium: 0.86-x 0.86-x x x
Given the data provided, the expression for Kp is as follows:
Kp = [NO₂] [SO₂] / [NO] [SO₃]
Kp = x.x / (0.86-x)²
The answer's value for Kp is 0.0118.
We plug this value into the equation above
0.0118 = x² / (0.86-x)²
When the quadratic equation is solved, the value of x is found to be 0.084 atm.
As a result, NO₂ has an equilibrium pressure of 0.084 atm.
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Find the negative and positive ions in 2g boric acid
The number of positive ions in 2g boric acid = 5.78 × 10²² ions
The negative ions in 2g boric acid = 5.78 × 10²² ions
Boric acid, greater specifically orthoboric acid, is a compound of boron, oxygen, and hydrogen with formulation B(OH)₃. It is able to additionally be referred to as hydrogen borate or boracic acid. it also includes encountered as colorless crystals or a white powder.
Boric acid = H₃BO₃
into ions = 3OH⁻ + 3B⁺
mass of boron = 11
H = 3×1 = 3
O = 3×16 = 48
The molar mass of boron = 11 + 3 + 48
= 62 g
A mole of boric acid = 2/62
= 0.032 mole
1-mole positive ions contains = 3 ions
1-mole negative ions contains = 3 ions
0.032-mole positive ions = 3 × 0.032 = 0.096
0.032-mole negative ions = 3 × 0.032 = 0.096
1 mole contains = 6.022 × 10²³
0.096 mole = 6.022 × 10²³ ×0.096 ions
= 5.78 × 10²² ions.
positive ions in 2g boric acid = 5.78 × 10²² ions
negative ions in 2g boric acid = 5.78 × 10²² ions
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a scientist is testing if caffeine helps mice run games faster. 10 mice receive 10 mg and 10 get a fake dose, then try to solve the same maze and their time is measured while they do it. what are the following in this experiment
In the experiment in which a scientist is testing if caffeine helps mice run games faster;
the 10 mice are the subject of the experimentthe 10 mg caffeine dose is the independent variablethe 10 fake dose is the control variablethe speed of the mice is the dependent variableWhat is an experiment?
An experiment is a scientific test or study which is performed in order to prove or disprove a hypothesis.
Experiments can also be undertaken in order to further establish or improve upon already established.
Variables are those factors that are studied in an experiment.
In a scientific experiment, the following variables are present:
The independent variable - this is the variable that changes that occur in it produce a change in the variable under studyThe dependent variable - this is the variable that is under study that is affected by the independent variable.The control variable - this is the variable that is kept constant or unchanged.Learn more about experiments at: https://brainly.com/question/25303029
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Identify: What type of eclipse is shown in the
diagram?
Answer:
the eclipse shown in the diagran Lunar Eclipse
Explanation:
Because the moon is reflecting from the sun which is seen on the earth
consider the following reaction at equilibrium: 2no₂(g) ⇌ n₂o₄(g) the ∆h° for this reaction is < 0. if the volume of the container is decreased by ½ while the temperature is kept constant, in which direction will the equilibrium shift?
forward direction will the equilibrium shift .
2no₂(g) ⇌ n₂o₄(g)
∆h° for this reaction is < 0. if the volume of the container is decreased by ½ while the temperature is kept constant.
then,
k equivalent is inversely proportional to volume.
k eq ∝ 1/v in this reaction (from coefficient of reactants and products)
if the volume of the container is decreased by ½ .
then, k eq increase 2 times.
k equivalent is greater than 1
this shows that equillibrium shift will take place in forward direction.
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Jess set up an experiment to test the effects of different potting soils covered with paper mulch on bean plants. Which of these is the dependent variable in this experiment?
Jess set up an experiment to test the outcomes of different potting soils protected with paper mulch on bean plants: An test changed into set up to test the hypothesis that every one plants will develop faster in a "first rate soil" versus ordinary potting soil. A based variable is a variable being examined in a scientific test.
An experiment is a manner executed to support or refute a speculation or determine the efficacy or likelihood of something previously untried. Experiments offer insight into cause-and-impact by way of demonstrating what final results take place when a specific element is manipulated.
An experiment is an investigation in which speculation is scientifically tested. The test manipulates a biasing variable (motive) and measures a fixed variable (effect). All external variables are controlled. The bonus is that the experiment should be the goal. Experiments can provide clues about the form or mathematical form of a principle, as well as provide evidence about the lifestyle of the individuals considered in our theory.
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if you gently shake a separatory funnel containing a carboxylic acid with ethyl acetate and aq nahco3, the organic acid will be found where? (multiple answers possible)
The organic compound, carboxylic acid will be found in ethyl acetate.
What are organic compounds?Organic compounds are those compounds that are obtained naturally from living matter.
Organic compounds are mostly composed of carbon, hydrogen, and oxygen.
Organic compounds are generally covalent compounds. Hence, they are usually non-polar compounds.
Based on the principle of like dissolves like, organic compounds are usually soluble in non-polar organic solvents and insoluble in polar inorganic solvents like water.
Carboxylic acid is an organic compound.
Ethyl acetate is an organic compound.
Aqueous NaHCO₃ is an inorganic compound.
Hence, carboxylic acid will dissolve in Ethyl acetate.
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List 6 characteristics that separate compounds from mixtures:
Answer:
Listed below
Explanation:
COMPOUND
1. It is a pure substance.
2. It can not be separated by a physical method.
3. Element loses their properties in a compound.
4. Its composition is fixed throughout its mass.
5. It has a fixed melting point.
6.In nature they are homogeneous.
MIXTURE
1. It is an impure substance.
2. It can be separated by a physical method.
3. Substances forming mixture retain their properties.
4. It has no fixed composition.
5. It has no sharp melting point.
6. They can be homogeneous as well as heterogeneous in nature.
Sally is swimming 6 meters every 2 seconds. this increase in speed took 10 seconds. what is the acceleration during this second part of the race?
The acceleration for the second part of the race is 0.3m/s².
How to calculate acceleration?Acceleration is the amount by which a speed or velocity increases. The acceleration can be calculated by dividing the speed of the object by the time taken as follows:
Acceleration = speed/time
According to this question, Sally is swimming 6 meters every 2 seconds, however, this increase in speed took 10 seconds.
The speed Sally is swimming is 3m/s i.e. 6/2. Hence, the acceleration can be calculated as follows:
Acceleration = 3m/s ÷ 10s
Acceleration = 0.3m/s²
Therefore, 0.3m/s² is the acceleration for the second part of the race.
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1. 547 grams of hydrated mgso4 is heated in a crucible. After heating, 0. 7554 grams of anhydrous mgso4 remains in the crucible. How many waters of hydration were attached to the mgso4?.
7 waters of hydration were attached to the MgSO4.
1. 547 grams of hydrated mgso4 is heated in a crucible.
molecular weight of mgso4= 120 g/mol
let, x number of water molecule present in this hydrated mgso4
then, molecular weight = 18x +120.
MgSO4.X(H2O)-------> MgSO4 +X( H2O)
IF , n mole of hydrated mgso4 taken in the reactant side then , n mole of
anhydrous MgSO4 produce according to reaction.
n= 1. 547 /18x +120;
which is equal to mole of anhydrous MgSO4 that is
n= 0. 7554 /120;
by equating both equations
we get ,
0. 7554 /120 = 1. 547 /18x +120;
x= 7 (nearly.)
hence, 7 waters of hydration were attached to the MgSO4.
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