Answers
The masses and volume of the required reagent are as follows:
Mass of KCIO₃ required = 6.53 gmass of BaSO₄ precipitate formed = 1.02 gVolume of KCl required = 46.0 mLWhat is the mass in grams of KCIO₃ needed to produce 2.56 grams of O₂?The mass in grams of KCIO₃ needed to produce 2.56 grams of O₂ is determined from the mole ratio of the reaction as given in the equation of reaction below:
2 KCIO₃ (s) → 2 KCl (s) + 3 O₂ (s)
From the equation of reaction, 2 mole of KCIO₃ produces 3 moles of O₂.
Moles of O₂ in 2.56 grams = 2.56/32
Moles of O₂ in 2.56 grams = 0.08 moles
Moles of KCIO₃ required = 0.08 * 2/3
Moles of KCIO₃ required = 0.0533 moles
molar mass of KCIO₃ = 122.5 g/mol
Mass of KCIO₃ required = 0.0533 * 122.5
Mass of KCIO₃ required = 6.53 g
Mass of precipitate formed when 25.00 mL of 0.200M BaCl₂ and 35.00 ml. of 0.125 M Na₂SO₄ are mixed is determined as follows:
BaCl₂ (aq) + Na₂SO₄ → BaSO₄ (s) + 2 NaCl (aq)
Moles of BaCl₂ reacting = 25.00 mL * 1 L/1000 mL * 0.200M
Moles of BaCl₂ reacting = 0.005 moles
Moles of Na₂SO₄ reacting = 35.00 mL * 1 L/1000 mL * 0.125 M
Moles of Na₂SO₄ reacting = 0.4375 moles
Na₂SO₄ is the limiting reactant and moles of BaSO₄ precipitate formed = 0.4375 moles
molar mass of BaSO₄ = 233 g/mol
mass of BaSO₄ precipitate formed = 0.4375 moles * 233 g/mol
mass of BaSO₄ precipitate formed = 1.02 g
Volume of 0.250 M KCl (aq) that will completely react with 50.0 ml.
of 0.115M Pb(NO₃)₂ (aq) is determined as follows:
Pb²⁺ (aq) + 2Cl⁻ (aq) → PbCl (s)
Moles of Pb(NO₃)₂ = 50 ml * 1 L/1000 mL * 0.115 M
Moles of Pb(NO₃)₂ = 0.00575 moles
Moles of KCl required = 2 * 0.00575 moles
Moles of KCl required = 0.0115 moles
Volume of KCl required = 0.0115/0.250
Volume of KCl required = 0.046 L
Volume of KCl required = 46.0 mL
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Related Questions
Label each of the digits as significant or not significant.
0.04600
Answers
When determining the significance of digits in a number, the general rule is as follows:
1. Non-zero digits are always considered significant.
2. Leading zeros (zeros to the left of the first non-zero digit) are not considered significant.
3. Captive zeros (zeros between non-zero digits) are considered significant.
4. Trailing zeros (zeros to the right of the last non-zero digit) may or may not be significant, depending on whether they serve as placeholders.
In the number 0.04600, we can label each digit as follows:
0.04600
The first zero is a leading zero and is not considered significant.
The digit 0 after the decimal point is considered significant as it is a captive zero.
The digits 4 and 6 are non-zero digits and are considered significant.
The last two zeros are trailing zeros, and their significance depends on whether they serve as placeholders.
If the zeros in 0.04600 are intended to indicate the precision of the measurement or represent significant figures, then the trailing zeros are significant. In this case, all the digits in the number (0.04600) are significant.
However, if the zeros in 0.04600 are not intended to convey the precision or significant figures, and they are just placeholders, then only the first three digits (0.046) are significant, and the trailing zeros are not significant.
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HELP Can someone do this?
Answers
The first law appears to be at conflict with what we typically encounter. According to Newton's first law, any object at rest that is not affected by external forces will stay at rest, and any object in motion that is not affected by external forces will continue moving in a straight path at a constant speed.
The first law of motion in physics states that unless an external force acts upon a body, it will continue to move at its current uniform speed and remain at rest. A ball will exert force on the ground or a wall when it strikes them, respectively. The ground or a wall exerts a reaction force, which causes the ball to bounce back.
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why does oil float in water?
Answers
Answer:
Lower density than water
explanationThe answer to the question “Why does oil float on water?” is that oil floats on water because of its lower density than water. Oil and water molecules do not mix with each other due to the polarity of water molecules and the non-polarity of oil molecules. The volumetric mass of a liquid, expressed in cubic meters, is its density.
Why does water freeze at the temp it does in comparison to isopropyl alcohol??
Answers
Answer: A hydrogen bonded to an oxygen is more “attractive” than a carbon bonded to an oxygen. So, water molecules are “stickier” than ethanol molecules – making it easier for water molecules to get “stuck”.
Explanation:
Water hardness is the measure of the concentrations of __________ and __________ dissolved in the water sample.
Answers
Answer:
Calcium and Magnesium
Explanation:
Dissolved calcium (Ca++) and magnesium (Mg++) are the only two divalent cations found at appreciable levels in most waters.
The periodic table is arranged by various patterns is there a pattern with regard to iconic change
Answers
Calculate the number of atoms of silver in 3.53g of silver.
Answers
I NEED THIS ASAP!! It's not hard science btw. How can polluted stream waters enter groundwater sources? Be sure to use key terms from the lesson in your explanation. HINT: keywords= infiltration, irrigation, point sources, non point sources, etc. (you do NOT need to use all of these! )
Answers
Answer:
Poorly Constructed Irrigation Wells
These wells can allow contaminants to enter ground water. Often pesticides and fertilizers are applied in the immediate vicinity of wells on agricultural land.
Some wells rely on artificial recharge to increase the amount of water
infiltrating an aquifer, often using water from storm runoff, irrigation, industrial processes, or treated sewage. In several cases, this practice has resulted in increased concentrations of nitrates, metals, microbes, or synthetic chemicals in the water.
Explanation:
An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C.
Answers
The heat absorbed is 6.69 kJ.
What is the heat absorbed?We know that heat is a form of energy that exists due to a temperature change. Now heat could be added to or removed from a body. The specific heat capacity is a measure of the heat that is required to raise the temperature of 1 g of a substance by one degree Celsius. The higher the specific heat capacity, the more the heat that could be taken in by a body without a corresponding temperature change.
Now we have the following words of information from the question;
Mass of ice = 206g
Initial temperature = 0 degrees Celsius
Final temperature = 16 degrees Celsius
From the literature, we know that the specific heat capacity of ice is obtained as 2.03 J/g∘C
Thus we could write;
H = m c θ
H = heat absorbed/emitted
C = specific heat capacity
Θ = temperature change
H = 206g * 2.03 J/g∘C * ( 16 – 0)
H = 6.69 kJ
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Missing parts;
An ice bag containing 206 g of ice at 0 °C was used to treat sore
muscles. When the bag was removed, the ice had melted and the
liquid water had a temperature of 16.0 °C. How many kilojoules of heat were absorbed?
Which choice is not an example of a molecule?
A) 03
B) Mn
C) KOH
D)H₂S
Answers
Draw two cyclic constitutional isomers of trans-1,2-dimethylcyclopentane with the same size ring.
Answers
Constitutional isomers, they only differ in the position of the substituents.
What are constitutional isomers?The term isomers refers to the compounds that have the same molecular formula but different structural formulas. This implies that the atom to atom connection and the and the position of the substituents tend to differ quite markedly.
Now when we talk about the constitutional isomers, they only differ in the position of the substituents. The two compounds are essentially the same in the carbon structure but the placement of the substituents do differ. The two cyclic constitutional isomers of trans-1,2- dimethyl cyclopentane with the same size ring are shown in the image attached.
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DEPARTMENT OF CHEMISTRY
UNIVERSITY OF LIBERIA
1. A 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of
water on combustion. Chemical analysis shows that the
compound contains 4.68% N by mass. Would you conclude that
the white solid is cocaIne?
Answers
If 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of
water on combustion, then the white solid is cocaine.
What is Combustion reaction?A Combustion reaction is defined as the chemical reaction which is generally a fuel that undergoes an oxidation by the reaction by the help of an oxidizing agent, which further results in the emission of energy.
It is mainly an exothermic process. It reaction between fuels and oxidents. Fuels such as wood and coal undergoes an endothermal pyrolysis. This result in the creation of fuel. Types of cocaine:Pure CocaineCrack CocaineSynthetic CocaineBlack CocaineThus, we concluded that the white solid is cocaine if If 105.5mg sample of a white substance, suspected of being
cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of water on combustion.
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Which statement about trend lines is true?
Responses
a. A trend line shows the general pattern of the data, but does not try to connect all the data points.
b. A trend line connects the x-axis and y-axis.
c. A trend line connects all points drawn on the graph.
d. Trend lines are used instead of points.
"A" is the correct answer!
Answers
The statement stating that a trend line shows shows the general pattern of data but does not connect all points is true.
What are the characteristics of a trend line?The characteristics of a trend line are as follows:
1) It must be explained mathematically-It should support the observations through the mathematical calculations.
2)It must be self-proving-It should be self-explanatory for it's origin.
3)It should be able to make the data look linear.
4)It should be a curved line when the data fluctuates.
5)It should be a visual representation of data.
6)It denotes the overall direction of the data.
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1. Of the following groups of three, the elements whose properties are
most nearly alike are those having atomic numbers
A) 1, 2, and 3
B) 5, 13, 31
C) 5, 6, and 7
D) 3, 11, and 19
2. Which set of elements is listed in order of increasing metallic
reactivity?
A)Cu, Na, Pb, Sn
B) Sr. Ca, Mg, Be
C) K, Sc, V. Sn
D) B, Al, Ga, In
3. In the periodic table, elements known as metals are
A) in one row
B) in one column
C) on the left side
D) on the right side
4. Of the elements listed below, which element will have the most
vigorous reaction with water?
A) sodium, Na
B) magnesium, Mg
C) potassium, K
D) cesium, Cs
Answers
Answer:
Explanation:
1. D
2. B
3. C
4. A
Which of the following shows examples of things that convert light energy to electrical energy? (5 points)
•Fan and wind turbine
•Light bulb and blender
•Airplane and human body
•Solar panels and solar cells
Answers
Answer:
d) solar panels and solar cells
A model rocket has a mass of 0.2 kg, with a motor that can provide a force of 100 N. A second model rocket is being built with
the same motor, but it is being designed to accelerate half as much as the first rocket. What kind of change can be made in
the design to achieve this objective? (1 point)
O The mass of the second rocket should be 0.2 kg."
O The mass of the second rocket should be 0.01 kg.
O The mass of the second rocket should be 0.1 kg.
O The mass of the second rocket should be 0.4 kg.
Answers
A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
Mass of first rocket m1 = 0.2 kg
force of first rocket F1 = 100 N
force of first rocket F1= force of second rocket F2
mass of second rocket m2 = ?
acceleration of first rocket = a1
acceleration of second rocket = a2
Force = mass × acceleration
a1 = F1 / m1 and a2 = F2 / m2
F1 / m1 = F2 / m2
F1 = F2
it is given that acceleration of second rocket is half as much as the first rocket,
therefore,
F1 / 2m1 = F1 / m2
m2 = 2m1
m2 = 2 × 0.2kg
= 0.4kg
Hence,A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.
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how many quantum numbers were derived from schrodinger wave equation? a)2 b)3 c)4 d)6
Answers
Three quantum numbers were derived from Schrodinger wave equation.
How are quantum numbers derived from Schrodinger equation?Quantum numbers can be obtained while solving Schrodinger wave equation by the boundary conditions which can be applied while solving the equation in order to obtain solution which fits all the physical conditions.
Out of the four quantum numbers the principal quantum number,azimuthal quantum number and magnetic quantum number can be obtained from solving Schrodinger wave equation.
The only quantum number which cannot be obtained from solving the Schrodinger wave equation is spin quantum number,because it is related spin of the electrons which is explained by the Pauli's exclusion principle.
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Just as energy flows through an ecosystem, matter also moves from organism to organism and from organisms to the environment. Using either a kelp forest or a hydrothermal vent ecosystem as an example, explain how carbon can move through the organisms in that ecosystem
Answers
All life on Earth depends on the atom carbon. All plant and animal life involves the ingestion and expulsion of carbon, whether it be for the purpose of producing food or as part of respiration. Carbon is always moving from one location to another.
Explain how carbon can move through the organisms in that ecosystem.
Carbon moves from photosynthetic plants to other consumers in the kelp forest. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.
Ecosystem of the kelp forest:
Oceans are the sallow water ecosystem.driven by photosynthesis and sunlightAlgae and kelp are the main producers.Small fish consume this kelp.Big fish eat little fish.Water-heating vent Ecosystem:
Ecosystem deeppowered by an inorganic compound's energy.Bacteria are the primary producers.These bacteria coexist symbiotically with the primary consumer.
On the principal consumer, the other consumers feed.
As a result, we can infer that carbon is transferred from photosynthetic plants to other consumers in kelp forests. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.
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a king brings a bar of gold to you and tells you he was told it was real gold, but he is wondering if that is true. his gold bar has a mass of 10 grams and has a volume of 1.05. using the chart below, is the kings gold bar real gold, if not, what metal is it?
Answers
The density of the given gold bar is 9.52 .
The density of gold metal used for jewellery is 19.32g/cm³
Given gold bar has mass of 10 grams and has volume of 1.05.
Density = mass /volume ⇒D =10/ 1.05= 9.52 g/cm³
so, the gold bar king has is not pure gold.
The acid test for gold is by rubbing the gold-colored item on black stone, which will leave an easily visible mark. The mark is then tested by applying nitric acid, which dissolves the mark of item that is not gold. If the mark remains same, it is tested by applying aqua regia (nitric acid and hydrochloric acid).
In a nitric acid test, a jeweler places a few drops of the acid on the piece of item and watches for the reaction. With copper, the reaction causes the liquid to turn green, give off fumes, and bubble. This response is called a hard cupric reaction and indicates that the item is not real gold
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A farmer weighs out 32.0 kg of chicken eggs. What mass of quail eggs would he need to weigh out to have the same number of eggs in both
Answers
mass of quail eggs he need to weigh out to have the same number of eggs in both is 2 Kg
Despite being smaller than chicken eggs, quail eggs are heavier in terms of fat, protein, iron, riboflavin, and vitamin B12. They are more difficult to find and more expensive than chicken eggs, though.In this problem we have to find out mass of quail eggs by taking reference to chicken eggs, so this could be example of relative mass theory.mass of standard chicken egg is 37.44g
mass of standard quail egg is 2.34g
Ratio of mass of eggs 16:1
Given,
farmer weighs out 32 Kg of chicken eggs
let x be the mass of the quail eggs he needed
let's calculate mass of quails eggs he needed
1/16 = x/32
x = 2kg
Therefore, mass of quail eggs he needed to weigh out same number of eggs in both is 2kg
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jays instanteous speed at 35 min
Answers
Answer
0.6 km/min2
Explanation:
Answer:
?????????
Explanation:
Who created the airbag a engineer or scientist or both?
Answers
1. Which wave below has the highest frequency (A-E)?
Answers
Gamma ray have the highest frequency.
Gamma ray has the shortest wave length. it has the highest energy and highest frequency. Gamma Radiation region has the highest frequency.
Electromagnetic spectrum is the range of frequencies of the EM radiations and their wavelengths.
Frequency is the number of waves that pass a point at unit time. It can be also defines as the number of cycles or vibrations .Its Formula is,
f=1/T
were f= frequency,
T= time period.
Time period is the duration of time in which an activity occurs.
In Gamma ray their wavelengths are shorter that the nucleus of the atom, because of this they have high frequencies. Their frequencies are greater than 1019Hz.
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Music is often used to accompany pictures. What type of music would most likely accompany a photo of a fox chasing a rabbit?
A. Slow, Legato, Major Key
B. Upbeat, Fast, Staccato
C. Slow with Fermatas
D. Long and Flowing phrases
Answers
Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.
Why is music so special?Its language transcends barriers and divisions.
Everyone uses the same language when it comes to music. It is a factor that unites people from all over the world regardless of where they are from and is unaffected by boundaries or prejudices. This would appear that one of our most fundamental instincts is to make music.
Why is music so important and powerful?Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries.
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Option B , Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.
Why is music so important and powerful?
Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries. So, music is so important and powerful.
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How many moles of atoms are there in 65 molecules of calcium chloride?
Answers
There are 65 moles of atoms in 65 molecules of CaCl2 ( Calcium chloride )
In stoichiometry,
1 moles of any substance = 6.022 × 1023 molecules or atoms.
x moles of CaCl2 = 65 * 6.022 × 1023
Cross multiplying this equations
x * 6.022 × 1023 = 1 * 65 * 6.022 × 1023
6.022 × 1023x = 65 * 6.022 × 1023
x = 65 * 6.022 × 1023 / 6.022 × 1023x
x = 65 moles.
This means that there are 65 moles in 65 molecules of CaCl2
What is mole?Mole simply refers to the quantity of atoms, molecules or particles that an atom of an element contains.
1 moles of any substance equals 6.022 × 1023 molecules or atoms.
So therefore, there are 65 moles in 65 molecules of CaCl2 ( Calcium chloride )
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If a patient receives a dose with an activity of 52.6 mCi of technetium-99m for cardiac imaging, how much radioactivity will be left in the patient’s body 96 hours after injection?
Express the radio activity to 3 sig figs and include the units.
Answers
The amount of the technetium-99m that will remain in the patient’s body 96 hours after injection is 0.000803 mCi
How to determine the number of half-livesWe'll begin by obtaining the number of half-lives that has elapsed. This can be obtained as follow:
Time (t) = 96 hoursHalf-life (t½) = 6 hoursNumber of half-lives (n) =?n = t / t½
n = 96 / 6
n = 16 half-lives
How to determine the amount remainingThe amount of the radioactivity remaining in the patient's body can be obtained as follow:
Original amount (N₀) = 52.6 mCiNumber of half-lives (n) = 16Amount remaining (N) =?N = N₀ / 2ⁿ
N = 52.6 / 2¹⁶
N = 0.000803 mCi
Thus, the amount remaining is 0.000803 mCi
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Which subatomic particle has the least mass?
URGENT
Subject/SCIENCE
A. electron
B. proton
C. neutron
D. the atom
Answers
Answer:
I thinnk neutron bcoz its is a charge less particle and it's contains less atom so it has less mass
Match the mineral group to its examples or definition.
Answers
sulfide mineral is made of from metal and sulfphur
Sulfide, also written sulphide, is a category of chemicals that contain sulfur and one or more metals. The majority of sulfides have basic structural characteristics, great crystallographic symmetry, and numerous metal-like characteristics, such as metallic lustre and electrical conductivity.
Sulfides include, for instance, chalcopyrite, galena (the primary ore mineral for lead and silver), and cinnabar (the primary ore mineral for mercury) (which provides copper).
Sulfide minerals are composed of sulfur and one or more metals; sulfarsenides have some of the sulfur replaced with arsenic.
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This question will walk you through the process of calculating the
number of molecules present in a sample of a compound with a given
mass and chemical formula. This problem will be solved via the
following sequence of conversions: mass → moles → molecules
Consider a dose of Pepto Bismol containing 525 mg of its active
ingredient, bismuth subsalicylate (C7HsBIO4).
Step 2a: Design a problem-solving strategy. Convert the mass given in
milligrams to grams. The molecular formula of bismuth subsalicylate is
C7HsBIO4. What is the molar mass of this compound?
Answers
The molar mass of bismuth subsalicylate is 391.12 g/mole.
What is molar mass?
Molar mass of a substance is defined as mass in of one mole of a compound. In a substance the amount of entity present is defined a mole.
Molar mass can be expressed as
M = m/n
Where M is molar mass, m is mass of substance and n is number of moles
To calculate molar mass of C7HsBiO4 is:
12.011 x 7 + 34.1 + 208.98 + 15.99 x 4
= 84.077 + 34.1 + 208.98 + 63.96
= 391.12 g/mole
Thus, the molar mass of bismuth subsalicylate is 391.12 g/mole.
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A 10g metallic block measures has a volume of 5 cm^3. What is the density of the metallic block in g/cm^3
Answers
A 10g metallic block measures has a volume of 5 cm^3. The density of the metallic block in g/cm^3 is 2gm/cm^3. The density of a metallic block is calculated by p=m/v
What, for example, is density?Its density is the amount of "stuff" that can be packed into a given amount of space. A block of the tougher, lighter element gold (Au), for example, will have a higher density than a block of the heavier element lead (Pb).
Calculation of the density of the above problem.The density of a substance is given by the following formula:~
ρ = m/v
where the respective alphabets stands for
ρ is the density
m is the mass
V is the volume
by replacing in formula :
p = 10(gm)/5cm^3
p = 2gm/cm^3
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