The sample's decay constant for the given time of radioactive decay is 0.0058 days⁻¹. Thus, the half life of the sample is 119.48 days.
What is radioactive decay?Heavy unstable radioactive nuclei undergo radioactive decay by the emission of charged particles. They stable isotopes or new atoms by radioactive decay.
It is given that the sample of 24 grams decays to 18.8 grams within 18 days. The decay constant k can be calculated as follows:
k = 1/t log (Ci/Ct)
Where Ci is the initial amount and Ct be the final amount.
k = 1/18 log (24 g /18.8 g)
= 0.0058 days⁻¹
Now, the half life time of the sample can be calculated as:
t1/2 = 0.693 / k
= 0.693/0.0058 days⁻¹
= 119.4 days.
Therefore, the half life of the sample is 119.4 days.
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which two events are apart of the rock cycle
Answer:
The key processes of the rock cycle are crystallization, erosion and sedimentation, and metamorphism.
Explanation:
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Answer:
Earths heat and hydrological cycle
Explanation:
If 50 grams of Al2O3 was produced, how many moles of aluminum reacted?
Answer:
one mole of aluminium has reacted in it.
Explanation:
Al : Al2O3=100 gmol-1
4 : 2
2 : 1mol→100g
1 : }50g→1/2mol
Read the passage.
Water can react with hydrochloric acid (a strong acid) to form hydronium and chlorine ions. In this case, water acts as a base. Water also reacts with ammonia (a strong base) to form ammonium and hydroxide ions. In this case, water acts as an acid.
Which option correctly describes the reason for this phenomenon?
1. Water is a neutral compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
2.Every substance can act as a base or an acid depending on the reaction they partake in. This property of substances is called amphotericity.
3. Water acts as a conjugate acid when coupled with a strong acid, or as a conjugate base when coupled with a strong base.
4. Water is an amphoteric compound. It can act as a base when coupled with a strong acid, or as an acid when coupled with a strong base.
How many grams are there in 0.37 moles of H20?
Answer:
18.01528 gram using the molecular weight calculator and the molar mass of H2O.
Explanation:
How many grams of sodium chloride are present in 11.00 moles?
331.0 g
4500 g
156.6 g
642.9 g
Which of the following best describes the impact of glaciers upon the surface of the earth? a. ice buried continents under a few hundred feet of ice. b. glaciers scraped across the surface and altered landscapes and the course of rivers. c. the passage of glaciers created new ecosystems. d. all of the above. please select the best answer from the choices provided a b c d
Glaciers scraped across the surface and altered landscapes and the course of rivers best describes the impact of glaciers upon the surface of the earth.
What are glaciers?Glaciers are the huge big bodies which are formed by the compression of fallen snow on the land and converts into the ice.
Glaciers shows movement due to the gravitational force and this movement of glaciers will carry sediments, rocks and soil with it self. So, the glacier movement will affect the land by destroy the shape of land surface due to the transfer of land materials and sometimes block the path of rivers also.
Hence, option (b) is correct.
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Answer: B
Explanation:
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How many moles of water are produced when 5 moles of hydrogen gas react with 2 moles of oxygen gas? (5 points)
2 moles of water
4 moles of water
5 moles of water
7 moles of water
Answer: 4 moles of water
Explanation:
What is one way to spearate awater an salt
Answer:You can boil or evaporate the water and the salt will be left behind as a solid. If you want to collect the water, you can use distillation. This works because salt has a much higher boiling point than water.
Explanation:
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What is the heat of combustion of ethane, c2h6, in kilojoules per mole of ethane?.
Combustion is the process in which CO₂ is react with reactant. Heat of combustion of ethane is 1560 kilo joule per mole.
What is combustion ?Combustion is the process in which oxygen is react to form heat or energy. There are three types of combustion as follows
spontaneous combustion
rapid combustion
explosive combustion
Combustion is a chemical reaction between substances, mostly including oxygen and usually followed by the generation of heat and light in the form of flame.
Combustion is the other word for burning. In a combustion reaction, a fuel is heated and it reacts with oxygen and their is energy released.. The fire triangle require the three things for combustion - a fuel, heat and oxygen.
Thus, combustion of ethane gives 1560 kilo per joule energy.
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What is the relative abundance of oxygen in the atmosphere?
Answer:
20.95%
Explanation:
There is oil that is coming up on the beach from the waves. What most likely caused the oil to get in the water?
Animals have carried oil from land to the water.
An accident caused an oil rig to spill oil into the ocean.
The wind has blown oil into the ocean from land.
The oil has come from a crack in the ocean floor.
Answer:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
Explanation:
Someone would know that they are polluting the ocean but someone left it there so the water or and accident cause the oil rig to spill.
Answer:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
Explanation:
The answer is (B) An accident caused an oil rig to spill oil into the ocean.
how many grams of sulfur can be formed from 108g of sulfur dioxide?
Answer:
1.99 grams
Explanation:
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4. Which is a clastic rock?
A
coal
B.
limestone
U
rock gypsum
D
sandstone
Answer:
B limestone
Explanation:
What was the concentration of my stock solution if I used 23mL of it to make 102 ml of 1.4 M dilution?
Answer:
formula:c1v1=c2v2
Explanation:
v1=102ml,c1=1.4mol/l
v2=?;c2=2.4mol/l
v2=v1×c1÷c2=102ml×1.4mol/l÷2.4mol/l
=59.5ml
i hope this will help you
Nitrogen gas and hydrogen gas react to produce ammonia according to the following equation.
N2 + 3H2 → 2NH3
The atomic mass of nitrogen is 14 g/mol. The atomic mass of hydrogen is 1 g/mol. When the reaction produces 68 grams of ammonia, how many grams of nitrogen were present initially?
A 112
B 4
C 56
D 12
Answer:
C
Explanation:
First we have to find the molar mass of NH3 which we can do by adding the atomic masses of all the constituents. 14+3(1) = 17g/mol. Then we convert the grams of ammonia to moles. 68/17=4 moles of ammonia produced. According to the equation, one mole of nitrogen gas corresponds to two moles of ammonia, so for our 4 moles of ammonia, 2 moles of nitrogen gas were there originally. Then we convert that figure into grams using the molar mass of nitrogen gas. 2(14) = 28g/mol and 28*2=56 grams of nitrogen gas.
Which statement best describes the atoms in a gas?
Answer:
They move freely in all directions.
Explanation:
61.2 grams of hydrogen sulfide react with 64.0 grams of Sulfur dioxide and produce 62.2 grams of solid sulfur (S8). (a) What amount of solid sulfur do you expect to be produced, theoretically, by the reaction with the given quantities of reactants? (Limiting reagent problem
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Reaction
8SO₂ + 16H₂S → 3S₈ + 16H₂O
find limiting reactant
mol SO₂ = 64 : 64 g/mol = 1
mol H₂S = 61.2 : 34 g/mol = 1.8
ratio mol:coefficient
SO₂= 1 : 8= 0.125
H₂S=1.8 : 16 = 0.113
H₂S as a limiting reactant (smaller ratio)
mol S₈ will be based on limiting reactant (H₂S)
mol S₈ = 3/16 x 1.8 = 0.3375
mass S₈ = 0.3375 x 256 = 86.4 g
Calculate the volume of an
object with the following
dimensions:
5.0 cm x 16 cm x 12 cm
Answer:
960cm
Explanation:
5.0cm x 16cm =80cm
80cm x 12cm=960
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A solution has a concentration of 0.8 M and contains 15 g AgBrO3. What is the volume of the solution
Answer:
Solution Concentration: Molarity Moles of solute in one liter of solution Used because it describes how many molecules of solute are in each liter of solution Tro: Chemistry: A Molecular Approach, 2/e 6 amount of solute (in moles) Molarity, M = amount of solution (in L) moles of solute M = L of solution or simply 4
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A solution has a concentration of 0.8 M and contains 15 g AgBrO3.The volume of the solution is 0.08 L.
What do you mean by the term molarity ?The term molarity is defined as the number of moles of solute per litre of solution. Molarity, M = amount of solution (in L) moles of solute M = L of solution.
It is also called as molar concentration. As the number of moles of solute is measure out in mol and the volume of solution will be in litre. Hence, the unit of molarity is mol L - 1.
Given:
Molarity = 0.8 M
Mass = 15 gram
The molar mass for AgBrO3 = 235.769 g/mol.
Then calculate the number of moles in the sample by dividing the given mass by the molar mass.
15g 235.769 g/mol = 0.064 moles
Molarity = Number of moles/volume
Volume = Number of moles/Molarity
Volume = 0.064/0.8 M
Volume = 0.08 L
Thus, the volume of the solution is 0.08 L.
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1. The actual value for absolute zero in degrees Celsius is −273.15. Use the formula below to determine your percent error for both gas samples.
|experimental value – actual value| x 100
actual value
The Percent error for ice and salt water is 94.55%. The Percent error for ice water is 100.40%.
What is absolute zero?Absolute zero is the temperature whereby a system in its balanced state contains the lowest energy that corresponds to -273.15 °C.
Using the formula for Percent error, we have:
[tex]\mathbf{percent \ error = \dfrac{|experimental \ value| - |actual \ value| }{|actual \ value|} \times 100\%}[/tex]
For ice and salt water:
[tex]\mathbf{percent \ error = \dfrac{|-14.9 -(-273.15)| }{|-273.15|} \times 100\%}[/tex]
Percent error = 94.55%
For Ice water:
[tex]\mathbf{percent \ error = \dfrac{|1.1 -(-273.15)| }{|-273.15|} \times 100\%}[/tex]
Percent error = 100.40%
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How does the crystallization of igneous material occur?.
Name the functional group in the
following molecule:
NH2
A. aldehyde
B. amine
C. amide
D. thiol
Answer:
The functional group is called a amide so its, C.
Explanation:
A sample of neon is at 75 C and 115 kPa. If the pressure changes to 127 kPa and the volume remains constant, what is the new temperature, in C?
The new temperature of the sample of neon is 111.31 °C.
What is temperature?Temperature can be defined as the hotness or coldness of a thing or place.
To calculate the new temperature of the sample of neon, we apply the formula below.
Formula:
P/T = P'/T'.................. Equation 1Where:
P = old pressure valueP' = new pressure valueT = old temperature valueT' = new temperature value.Make T' the subject of the equation
T' = P'T/P............ Equation 2From the question,
Given:
P' = 127 kPaP = 115 kPaT = 75 °C = (75+273) = 348 KSubstitute these values into equation 2
T' = (127×348)/115T' = 384.31 KT' = (384.31-273) °CT' = 111.31 °CHence, The new temperature of the sample of neon is 111.31 °C.
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CHEMCIAL TECHNOLOGY QUICK CHECK which activity would be considered resource extraction? eating beef raising cattle eating deer hunting deer WILL GIVE BRAINIEST TO WHOEVER GOVES ME THE WHOLE QUICK CHECK
Hunting deer can be considered resource extraction. It involves the loss of biodiversity.
What does resource extraction mean?Resource extraction refers to the usage of fundamental resources (biodiversity resources) from the environment.
Hunting deer is considered a resource extraction activity because this activity involves the loss of biodiversity.
Biodiversity is a fundamental issue for the health (homeostasis state) of the whole ecosystem.
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Answer:
Hunting dear, fewer trees to a decrease in earths carbon dioxide absorption, advancements in medicine, Hydrogen is a component of water , removing acid causing oxides from factory smoke
Explanation:
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Use the map to identify which body of water (A, B, C, or D) matches bar 3, and explain your answer.
Select the statement that correctly describes the connection between two nucleotides:
A phosphodiester bond would form between the phosphate groups of each of the nucleotides..
A phosphodiester bond would form between the base of one nucleotide and the phosphate of the second nucleotide.
A phosphodiester bond would form between the phosphate group of one nucleotide and a hydroxyl group of the second nucleotide.
A phosphodiester bond would form between a purine base of one nucleotide and a hydroxyl group of the second nucleotide.
Answer:
The band that looks like milk in the night sky isn't actually milk,
Explanation:
Which is a trait of a technical text?
What is the oxidation number of oxygen
in N02-?
Nitrogen dioxide (NO2) is a molecule which contain two oxygen atom and one nitrogen atom. Oxidation number of nitrogen atom can be found by two methods, algebra method and observing structure of molecule. Oxidation number of nitrogen is important to decide to whether NO2 can be oxidized or reduced.
Compare ferns, gymnosperms, and angiosperms by writing each characteristic in the box underneath the correct plant type. • reproduce with cones • reproduce with spores • reproduce with flowers • existed the longest in Earth history • newest type of plant in Earth history • has needle-like, waxy leaves 1)
Ferns reproduce with spores which existed the longest in Earth history.
Gymnosperms reproduce with cones and has needle-like, waxy leaves.
Angiosperms reproduce with flowers and newest type of plant in Earth history.
How ferns, gymnosperm and angiosperm reproduce?Ferns reproduce with spores that existed the longest in Earth, gymnosperms reproduce through the formation of cones having needle-like, waxy leaves whereas angiosperms reproduce with flowers which turns into seed. The newest type of plant in Earth history is also belongs to this group.
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Balance the following chemical equation:
As4S6+
02
->
As406+
SO2
What the answer
student has two balloons, one filled with helium and one filled with argon. Each balloon has a volume of 22.4-L at STP. Which of the following correctly describes these samples
The statement that can be made about the samples is that each balloon contains 1 mole of each gas.
What is molar volume?Molar volume refers to the volume that is occupied by one mole of a gas. According to Avogadro, the volume occupied by one ole of a gas is 22.4-L at STP.
Hence, if 22.4-L at STP is the volume of both the helium and argon filled balloons, then each balloon contains one mole of the gas.
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