Answer:
I think it's c
Explanation:
c seems like the best answer
Answer:
C since that has to be correct.
Sodium-24 has a half-life of 14.8 hours. How much of a 152.0 mg sodium-24 sample will remain after 3.7 days?
The mass of sodium that remains is 2.38 g
What is the remaining sodium?
We know that radioactivity refers to the spontaneous disintegration of the sample leading to the emission of radiation. The half life is the time taken for only half of the number of atoms in the sample to remain.
We know that;
No = amount of sodium initially present
N = amount of sodium after time t
t1/2 = half life of sodium
t = time taken for t amount remain
No = 152.0 mg
N = ??
t1/2 = 14.8 hours
t = 3.7 days or 88.8 hours
Using
N/No = (1/2) ^t/t1/2
N/152 = (1/2) ^88.8/14.8
N = (1/2) ^88.8/14.8 * 152
N = 2.38 g
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A boy eating a banana and riding his bike exhibits which energy transformation?
Explain why the name 1-propane is incorrect
Read the weight shown on this scale, and report the answer with the proper number of digits.
A scale with 10 dashes between each written number. The needle is pointing between the second and third dash from 80, towards 90. There are 9 dashes between 80 and 90.
weight:
lbs
The needle is pointing between the second and third dash from 80, towards 90, that means it could be around 82.5kgs on the scale. therefore, weight in lbs will be 181.88.
The letters "lb" or "lbs" stand in for LBS, which is derived from the Latin word Libra. It is a phrase used internationally to describe an object's weight or mass.On the scale there are 9 dashes which represents whole number count. For example, dash after 80 is for 81, second is for 82, third for 83 and so on. Needle is between 82 and 83 therefore it could be 82.5.You can convert 82.5 kilogrammes to pounds by multiplying the kilogramme amount by the conversion factor, 2.204622622. Thus, to convert 82.5 kilos to pounds, multiply 82.5 by 2.204 to get 181.88 pounds.There the weight on scale is 181.88 lbs.
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Answer:
82.3
Explanation:
If you look close at it, it should be between 82 and 83. Ask which one is it more closer to it should be 82 but not too close or not too far where it would be 82.5. It is in the middle of 82 and 82.5 so what is in between that? It would be 82.3.
an old gas station, gasoline leaks from an underground storage tank.
classification:
explanation:
Regular maintenance inspections and the replacement of damaged underground tanks are necessary to prevent gasoline leaks.
What causes gasoline leak?When tanks are damaged and rusted or if pipelines and connection points are poorly fitted, gasoline leaks might occur.A major environmental risk as well as a harm to people and property are posed by gasoline leaks.Leaks of gasoline can start fires that endanger lives and destroy property.Additionally, gasoline leaks can contaminate land, water, and soil, destroying vital aquatic and soil creatures.In our house, gasoline spills are quite frequent. Due to the higher likelihood that they will start a fire, explosion, or even carbon monoxide poisoning, they can be extremely deadly.Therefore, gasoline leaks can be avoided by performing routine maintenance checks and replacing damaged underground tanks.
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Assertion (A) : When HCl is added to zinc granules, a chemical reaction occurs.
Reason (R) : Evolution of a gas and change in colour indicate that the chemical reaction is taking
place.
The assertion and the reason that is given for HCl and zinc granules are true, but the reason is not correct for the assertion.
What is assertion?The assertion is the statement that is taken on the hypothesis. A chemical reaction takes place when weak hydrochloric acid is applied to a test tube containing zinc granules.
Here, we can observe how bubbles from the test tubes cause a colorless, odorless gas to develop.
As a result, when zinc granules are inserted in a test tube and diluted hydrochloric acid is added, A colorless, odorless gas that is evolving with bubbles was seen.
Thus, for HCl and zinc granules, both the claim and the explanation are accurate, however, the explanation is flawed in support of the claim.
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A change in the thermal energy of a substance can lead to a change of state. For example, when heat is added to a solid, its particles move ____________. Once the solid gains enough thermal energy, it can change to a liquid state.
Question 1 options:
A. faster
B. closer together
C. the same speed
D. slower
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?The formulas that a compound could have are about three. The empirical formula shows the ratio of the atoms in the compound. The molecular formula shows the actual number of atoms of each element that we have in any particular compound. The structural formula can be used to deduce the arrangement of atoms in the compound.
We can now obtain the empirical formula using;
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 ;
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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Calculate the mass of camphor (C₁0H₁60) that contains a billion (1.00 × 10°) hydrogen atoms.
Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits.
The mass of camphor (C₁₀H₁₆O) that contains 1×10⁹ hydrogen atoms is 1.58×10⁻¹⁴ g
How to determine the mole of hydrogenWe'll begin by obtaining the mole of hydrogen that contains 1×10⁹ atoms. This can be obtained as follow:
From Avogadro's hypothesis,
6.02×10²³ atoms = 1 mole of hydrogen
Therefore,
1×10⁹ atoms = (1×10⁹ atoms × 1 mole) / 6.02×10²³ atoms
1×10⁹ atoms = 1.66×10⁻¹⁵ mole of hydrogen
How to determine the mole of C₁₀H₁₆ONow, we shall determine the mole of C₁₀H₁₆O that contains 1.66×10⁻¹⁵ mole of hydrogen. This is illustrated below
16 moles of H is present in 1 mole of C₁₀H₁₆O.
Therefore,
1.66×10⁻¹⁵ mole of H will be present in = (1.66×10⁻¹⁵ × 1) / 16 = 1.04×10⁻¹⁶ mole of C₁₀H₁₆O
How to determine the mass of C₁₀H₁₆OMole of C₁₀H₁₆O = 1.04×10⁻¹⁶ moleMolar mass of C₁₀H₁₆O = (12×10) + (1×16) + 16 = 152 g/moleMass of C₁₀H₁₆O =?mole = mass / molar mass
Cross multiply
Mass = mole × molar mass
Mass of C₁₀H₁₆O = 1.04×10⁻¹⁶ × 152
Mass of C₁₀H₁₆O = 1.58×10⁻¹⁴ g
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Cobalt is element 27. Cobalt-60 is used in the medical treatment of cancer. How many neutrons and protons are contained in the nucleus of this isotope?
33 neutrons, 33 protons
27 neutrons, 27 protons
33 neutrons, 27 protons
27 neutrons, 33 protons
2. Students mixed 100 grams of 20°C water with 100 grams of water at an unknown
temperature. The final mixture was 40°C. What was the unknown initial temperature of the
second water sample?
The unknown temperature of the second sample is 80 degree C
In the law of conservation of energy, energy neither be created nor be destroyed - only it change one form to another form of energy.
Now,
Mass of the first sample of water , m1 = 100 g
Initial temperature for first sample , t1 = 20 degree C
Mass of the second sample of water , m2 = 100 g
Initial temperature of the second sample , t2 = ?
Final temperature for first sample = 40 degree C
c is known as the specific heat of the water
Now we are solving this problem the law of conservation of energy
Q(gain) = - Q(lost)
(m1c(delta t)1) = -(m2(delta t)2)
m1(Final temperature- t1) = - m2(Final temperature- t2)
t2 - Final temperature = m1(Final temperature- t1) / m2
t2 - 40 = 100 (40 - 20) / 100
t2 - 40 = 20
t2 = 20 + 40
t2 = 80 degree C
Hence, the initial temperature of second sample is 80 degree C
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At 25 °C, the vapor pressure of pure benzene (C6H6) and pure toluene (C7H8) are 95.1 and 28.4 mmHg, respectively. A solution is prepared that has equal masses of C6H6 and C7H8. Determine the total vapor pressure above this solution.
The total pressure of the solution is 123.5 mmHg
What is the total vapor pressure above this solution?We know that the total pressure of a system is the sum of the individual partial pressures of the components of the mixture. This is the postulation of the Daltons law of partial pressure.
Having said that, the total vapor pressure above this solution is the sum of the vapor pressures of pure benzene and pure toluene. If this is established, it now follows that;
Total pressure = pressure of pure benzene + pressure of pure toluene
= 95.1 + 28.4 mmHg = 123.5 mmHg
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Need help with this. See image attached
1. Lewis acid- electron pair acceptor.
2. Lewis base- electron-pair donor.
3. Bronsted acid- proton donar
4. Bronsted base- proton acceptor
5. A compound that acts as both a bronsted-lowry acid and base together is called amphoteric.
Machine parts, bodily processes or functions, healing mechanisms. A combination of mental processes, a psychological mechanism by which a result is achieved. A fundamental physical or chemical process involved in or responsible for an action-reaction or another natural phenomenon.
The difference between process and mechanism as nouns is that process is a sequence of events to achieve a result, and mechanism is in a machine or mechanism, especially as opposed to a product. Inside the machine or machine park. A mechanical means of transducing or controlling motion or transmitting or controlling force.
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This is the reaction when the 2-pentanone is converted into pentanol.
The presence of aldehyde converts the ketone to alcohol.
What mechanism is used?
The mechanism used is of aldehyde converting ketones to alcohol. The steps are as:
Conversion of ketone by aldehydemaking of carbonyl ionAdding carbon to the ionAddition of hydride to the carbonyl to the aldehyde.On adding acid, oxygen is protonatedThis gives us neutral primary alcohol.The types of acids and bases are shown as:
Lewis acid- electron pair acceptor.Lewis base- electron-pair donor.Bronsted acid- proton donarBronsted base- proton acceptorWhat are Lewis acids ?
Lewis acids are the compounds or ionic species that can accept an electron pair from any donor compound.
What are Lewis bases ?
Lewis base is the donor compound or ionic species.
What are Bronsted acids or bases?
Bronsted - Lowry acids are substance which donate H+ ions and these later forms a conjugate base while a Bronsted - Lowry bases are those substances which accepts H+ ions and they in return forms a conjugate acid.
A compound that acts as both a Bronsted - Lowry acid and base together is called amphoteric.
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A 20.0 ounce bottle of Mountain Dew contains 77.0 g of sugar. How many
calories would a person consume in a 365 day year if they drank one 20.0
ounce bottle of Mountain Dew per day? One gram of sugar provides 3.87
calories.
The amount of calories consumed in 365 day is 10877 calories.
What is energy in calories?Energy is the ability to do work.
Energy is present in the food that we eat such carbohydrates, protein, and lipid,
The SI unit of energy is Joules.
However, calories is the unit used in measuring energy found in foods.
For carbohydrate, the energy in calorie present per gram of carbohydrate is 3.87 cal/g.
The 20.0 ounce bottle of Mountain Dew contains 77.0 g of sugar.
Amount of energy in one bottle = 3.87 * 77 = 298 cal
In 365 days, amount of calories consumed = 298 cal * 365
amount of calories consumed = 10877 calories
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Question 4
An empty container weighs 34.50 g. When filled with water at 25°C, it weighs 37.21 g including the weight of
the container. When the same container is filled with an unknown liquid at 25°C, it weighs 38.95 g including
the weight of the container. Determine the density of the unknown liquid at 25°C.
Additional info
Density of water is 0.997048 g/mL at 25°C.
1.32 g/mL
1.05 g/mL
0/4 pts
0.611 g/mL
The density of the unknown liquid is 1.64 mL
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the volume of the containerWe can obtain the volume of the container by calculating the volume of the water. This is illustrated below:
Mass of empty container = 34.5 gMass of container + water = 37.21 gMass of water = 37.21 - 34.5 = 2.71 gDensity of water = 0.997048 g/mLVolume of water = ?Density = mass / volume
Thus,
Volume = mass / density
Volume of water = 2.71 / 0.997048
Volume of water = 2.718 mL
How to determine the density of the unknown liquidMass of empty container = 34.5 gMass of container + unknown liquid = 38.95 gMass of unknown liquid = 38.95 - 34.5 = 4.45 gVolume = 2.718 mLDensity of unknown liquid =?Density = mass / volume
Density of unknown liquid = 4.45 / 2.718
Density of unknown liquid = 1.64 mL
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For the reaction 2KI+Pb(NO3)2⟶PbI2+2KNO3 how many grams of lead(II) iodide, PbI2, are produced from 81.1 g of potassium iodide, KI?
Taking into account the reaction stoichiometry, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.
Reaction stoichiometryIn first place, the balanced reaction is:
2 KI + Pb(NO₃)₂ → PbI₂+ 2 KNO₃
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
KI: 2 molesPb(NO₃)₂: 1 molePbI₂: 1 moleKNO₃: 2 molesThe molar mass of the compounds is:
KI: 166 g/molePb(NO₃)₂: 331.2 g/molePbI₂: 461 g/moleKNO₃: 101.1 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
KI: 2 moles ×166 g/mole= 332 gramsPb(NO₃)₂: 1 mole ×331.2 g/mole= 331.2 gramsPbI₂: 1 mole ×461 g/mole= 461 gramsKNO₃: 2 moles ×101.1 g/mole= 202.2 gramsRule of threeRule of three is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them.
That is, what is intended with it is to find the fourth term of a proportion knowing the other three.
If the relationship between the magnitudes is direct, the direct rule of three must be applied using the following formula, being a, b and c known data and x the variable to be calculated:
a ⇒ b
c ⇒ x
So: x= (c×b)÷a
Mass of PbI₂ formedThe following rule of three can be applied: if by reaction stoichiometry 332 grams of KI form 461 grams of PbI₂, 81.1 grams of KI form how much mass of PbI₂?
mass of PbI₂= (81.1 grams of KI× 461 grams of PbI₂)÷ 332 grams of KI
mass of PbI₂= 112.61 grams
Then, 112.61 grams of lead(II) iodide, PbI₂, are produced from 81.1 g of potassium iodide, KI.
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Which elements would form metallic bonds?
Select all correct answers.
iridium
cadmium
iron
chlorine
The elements that would form metallic bonds are as follows:
IronIridiumWhat is a metallic bond?A metallic bond in chemistry is a chemical bond in which mobile electrons are shared over many nuclei and therefore, leads to electrical conduction.
Metallic bonds are formed strictly by metallic elements in the periodic table.
Iridium is a chemical element with symbol Ir with an atomic number of 77. It is a very hard, brittle, silvery-white transition metal.
Iron is also a metallic chemical element with symbol Fe.
Therefore, the elements that would form metallic bonds are as follows:
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Answer:
Iridium
Cadmium
Iron
Explanation:
Test.
How were Churchill's and Stalin's views of the postwar world different from Roosevelt's?
A. They wanted all nations to focus on domestic issues and not get involved with each other
B. They favored keeping spheres of personal influence
C. They believed in a return to colonial powers and borders
D. They believed in international organizations to arbitrate disputes
They wanted all nations to focus on domestic issues and not get involved with each other.
What did Churchill think about Roosevelt?Churchill stated, "I conceived an admiration for him as a statesman, a man of affairs, and a war leader," following Roosevelt's death on April 12, 1945. He was the best American friend that Britain has ever found, continued Churchill. The "Special Relationship" was created by their close personal relationship.
What did Stalin Churchill and FDR agree to at the Yalta Conference?Along with agreeing to include France in Germany's postwar governance, Roosevelt, Churchill, and Stalin also agreed that Germany should bear some, but not all, of the burden of making reparations after the war.
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Using dimensional analysis, convert 250 days to years.
250 days makes 0.68 years
What is conversion factor?The term conversion factor has to do with the factor that could be used to convert a value form one unit of measurement to another. We have to note that these units must be dimensionally correct such that the affected units can cancel out.
We have that;
1 year is made up of 365 days
We now have to set up the dimensions for the conversion of 250 days to years.
Thus;
250 days * 1 year/365 days
= 0.68 years
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A teacher listed the following two processes.
• Process 1: water changing to ice in a freezer
• Process 2: steam coming out of a kettle filled with hot of water
Which set of statements correctly identifies the change of energy taking place in each example?
Answer:
both because water changes to ice in a freezer and liquid turns into gas when heated at a certain temperature
Which of the following has the longest wavelength?
X-rays
Microwave
Ultraviolet
Gamma
Please help and explain if possible!
determine the maximum mass of sodium chlorate that will dissolve in 40g of water 30 degress
The maximum mass of sodium chlorate that will dissolve in 40g of water 30 degrees is 3.98816 g.
What is the maximum mass?The maximum mass is the theoretical yield that can be produced in a chemical reaction.
Given that, the temperature T is 30°C
The mass is 40 grams
S = 0.0043302 + 0.084330 + 3.5714 = 9.9704 g Sodium chlorate per 100 g water
Since 100 g of water can dissolve 9.9704 g of Sodium chlorate
By the formula of maximum mass
40 g of water can dissolve
(9.970440) / 100 = 3.98816 g Sodium chlorate
Thus, the maximum mass of sodium chlorate is 3.98816 g.
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When hydrogen sulfide is formed from a reaction in water, its low solubility causes it to bubble up in the form of a foul smelling gas.
What volume of 0.122 M hydrobromic acid is required to react completely with 142 mL of 0.166 M lithium sulfide according to the balanced equation
below?
2 HBr(aq) + Li₂S (aq) → H₂S (g) + 2LiBr (aq)
ANSWER: ____mL
Round your answer to the nearest whole number and do not use scientific notation.
The volume of 0.122 M hydrobromic acid required to react completely with 142 mL of 0.166 M lithium sulfide is 386 mL
Balanced equation2HBr(aq) + Li₂S (aq) → H₂S (g) + 2LiBr
From the balanced equation above,
The mole ratio of the acid, HBr (nA) = 2The mole ratio of the base, Li₂S (nB) = 1Data obtained from the questionFrom the question given above, the following data were obtained:
Volume of base, Li₂S (Vb) = 142 mLConcentration of base, Li₂S (Cb) = 0.166 MConcentration of acid, HBr (Ca) = 0.122 MVolume of acid, HBr (Va) =? How to determine the volume of HBrCaVa / CbVb = nA / nB
(0.122 × Va) / (0.166 × 142) = 2
(0.122 × Va) / 23.572 = 2
Cross multiply
0.122 × Va = 23.572 × 2
Divide both side by 0.122
Va = (23.572 × 2) / 0.122
Va = 386 mL
Thus, the volume of hydrobromic acid required for the reaction is 386 mL
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Read the two questions.
Question 1: Do heavy metals like lead and arsenic cause damage to human DNA?
Question 2: Should industries releasing heavy metals into land and water ecosystems be penalized?
Use complete sentences to explain whether both questions can be answered by science or not. Be sure to explain why for each question.
The DNA could be damaged by heavy metals.
What are heavy metals?The term heavy metals are metals that are known to cause a lot of damage in the body. These metals include but are not limited to cadmium, arsenic and nickel. We know the DNA to be the genetic material that is found in humans. It is composed of complementary base pairs held together by hydrogen bonds.
The presence of these heavy metals are able to damage the genetic materials in DNA and are able to disrupt the pathways of the repair of damaged DNA.
2) The release of heavy metals into the atmosphere has led to a lot of heath challenges especially the fact that they have been known to be carcinogenic. It then follows that the companies that release heavy metals into land and water ecosystems should be penalized for the damage that the are causing to the environment as well as to human health when this metals enter human system via these sources.
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A cake recipe calls for 170.0 mL of buttermilk. How many cups is this?
(1.0567 quart = 1
L and 4 cups =
1
quart
A cup is 240 ml and the cake recipe calls for 170.0 ml of milk. It's 2/4 of a cup.
How many mls are in a cup of tea?
the cups have a standard measure of 240ml, that is, if you buy one of these good quality utensils, even if in different places, the measure of 1 cup must always be equivalent to 240ml.
With this information, we can conclude that Ml is the abbreviation milliliter, the smallest unit of measurement for liquids. We start with the liter as the base unit, we must go down to one tenth of a liter, which is deciliter, then 100 tenths of a liter than the centiliter and we go up to one thousand tenths of a liter, which is milliliter. One liter contains one thousand milliliters.
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What happens as a chemical bond forms?
OA. Energy is released.
B. Heat energy is destroyed.
OC. The atoms gain energy.
OD. The bonding atoms get farther apart.
Convert 25.4 m3 to liters
Answer:
25400 liters
Explanation:
1 cubic meter is 1000 liters
25.4 cubic meter is 25.4×1000 liters= 25400
A measurement is accurate if it
Answer:
If a measurement closely matches the recognized standard for that measurement, it is considered accurate.
Explanation:
Precision:
“Precision means how close the measured values are to each other.”
A precise measurement is one that has less absolute uncertainty.
Measurement of Precision:
The Precision of measurement is found out by the instrument being
used. It is described by the least count of the measuring instrument. The smaller a physical quantity, the more precise instrument should be used.
Example:
Let the length of a pencil is measured with a meter rod and vernier caliper.
It shows that readings of the vernier caliper are more precise than the metering rod.
A weather balloon calibrated at 0.00 °C to have a volume of 12.0 L has what volume at -42.0 °C assuming pressure is held constant?
The new volume of a weather balloon initially calibrated at 0.00 °C to have a volume of 12.0 L is 10.15L.
How to calculate volume?The volume of a given gas at a constant pressure can be calculated using the Charles's law equation as follows:
V₁/T₁ = V₂/T₂
Where;
V₁ = initial volumeT₁ = initial temperatureV₂ = final volumeT₂ = final temperatureAccording to this question, a weather balloon is calibrated at 0.00 °C to have a volume of 12.0 L. The new volume at -42.0 °C assuming pressure is held constant can be calculated as follows;
12/273 = V/231
V = 10.15L
Therefore, 10.15L is the volume of the weather balloon.
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