Half-life is a time in which the concentration of the substance gets reduced to 50% of the initial concentration. The number of tritium that will be left after 51 years is 0.624 kg.
What is an isotope?Isotopes are chemical substances that have the same atomic number but different atomic mass because they have a different number of neutrons in the nuclei.
The half-life of the isotope, tritium is 12.3 years. Assuming we have 11 kg of substance and a number of years 51 years.
[tex]11 \times 2 ^{\frac{-51}{12.3}} = 0.6239 \;\rm kg[/tex]
Therefore, the number of tritium that will be left after 51 years is 0.624 kg.
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What volume is occupied by 0. 445 mol of co2 at 397. 0 k and 973 mmhg?
The volume which is occupied by 0.445 mol of carbon dioxide at 397K and 973mmHg is 11.32 L.
What is ideal gas equation?Ideal gas equation will be represented as:
PV = nRT, where
P = pressure = 973 mmHg = 1.28 atm
V = volume = ?
n = moles = 0.445 mol
R = universal gas constant = 0.082 L.atm / K.mol
T = temperature = 397 K
On putting all these values, we get moles as:
V = (0.445)(0.082)(397) / (1.28) = 11.317 = 11.32 L
Hence required volume of gas is 11.32 L.
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Identify the atom below.
a.) H
b.) He
c.) Bе
d.) С
Yeast and sugar were added to lukewarm water and place in a flask. a balloon was stretched over the opening of the flask. small bubbles were observed rising along the side of the flask as the balloon slowly began to inflate. it can conclude that ...
Answer:
Bubbles indicate change
Explanation:
i don't know if i'm right but if im not its fine
Hope it helps<3
What is a solution?
A. A mixture in which the parts are chemically combined
a
B. Any combination of a liquid and a solid
C. A liquid that contains solid particles unevenly distributed
throughout it
D. A mixture that has the same composition throughout
Answer:
A !!
it a mix where everything is combined together
3c reaction time =138.5 sec reation rate=
Answer:
Compute the reaction rate to the nearest whole number using the formula below,
mass of tablet/volume of water
Reaction Rate = mas
reaction time
3°C Reaction time = 138.5 sec
Reaction rate = mg/l/sec
24°C Reaction time = 34,2 sec
Reaction rate = mg/L/sec
40°C Reaction time = 26.3 sec
Reaction rate = mg/L/sec
65°C Reaction time = 14.2 sec
Reaction rate = mg/L/sec
Explanation:
I hope my answer help
Answer:
#1 is 36 (138.5 seconds)
#2 is 146 (34.2 seconds)
#3 is 190 (26.3 seconds)
#4 352 (14.2 seconds)
#5 is 145 (34.5 seconds)
#6 is 173 (28.9 seconds)
#7 is 216 (23.1 seconds)
Explanation:
Edge, we may have different orders.
A balloon with volume of 0.40 liters is at a temperature of 293 K. If the balloon is heated to 523 K, then what will the new volume be?
v=293+523
v=816
this is the answer
thank you
Neon is located in the last group of the periodic table. How many valence electrons does the element neon have? (5 points)
1
2
4
8
Answer:
it's 8
Explanation:
the last group of the periodic table is group 8. so all elements in a group should have the same number of valency electrons
How many moles of nacl are needed to make 5.2l of a 2m solution
Answer:
10.4 moles
Explanation:
n / 5.2 = 2 M
n = 10.4 moles
The electronegativity of the element affects all of the following except a- type of bond it forms with other elements b- the boiling point of its compounds c- the shape of the molecule it forms d- the ability of its compounds to dissolve in different solvents
The electronegativity of the element affects the ability of its compounds to dissolve in different solvents.
What is the meaning of electronegativity?Electronegativity is a measure of an atom's ability to attract shared electrons to itself.
Polar bonds have a positive and negative side to them, and therefore can attract water dipoles and dissolve in water.
If the polarities of the solvent and solute match (both are polar or both are nonpolar), then the solute will probably dissolve.
If the polarities of the solvent and solute are different (one is polar, one is nonpolar), the solute probably won't dissolve.
Hence, option D is correct.
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Plssssss helpppppp
Consider a beaker half-filled with water there’s a balloon stretched over the opening and nothing can leak out. What would happen if you placed the beaker/balloon apparatus on a hot plate and let the water come to a boil?
Answer:
The balloon will expand
Explanation:
Steam needs more space than the equivalent wt amount of liquid
what are 3 household substances that contain acids and say why are they useful
Answer:
battery. you use it for your remotes. vinegar. you use vinegar for cooking of cleaning. nail polish remover. you use this for removing nail polish
renata developed a hair dye additive that is guaranteed to cover grey hair. she granted the right to use this additive to a major hair collor manufacturer, and renata now recives a
What Renata has granted to the manufacturer of the colored hair dye is called a patent.
What is a patent?A patent is a right given to a manufacturer to be the sole producer of a product for a given period of time. Usually, the patent has to last for a given number of years after which the technology becomes commonplace.
Hence, what Renata has granted to the manufacturer of the colored hair dye is called a patent.
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HELP ASAP, EASY QUESTION
The diagram above shows the position the Earth is in in relation to the Sun during each season. You are to match the number with the correct season listed below:
Explanation:
Winter 4
Season when the northern hemisphere is tilted away from the sun.
Summer 2
Season when the northern hemisphere is tilted towards the sun.
Spring 1
Season when the northern hemisphere is neither tilted towards nor away from the sun; days getting longer and warmer.
Fall 3
Season in the northern hemisphere when the Earth is neither tilted towards nor away from the sun; days getting shorter and cooler.
Which example is an exothermic reaction?
A. dissolving ammonium nitrate in water to cool the water
B. melting ice
C. condensation
D. dissolving sugar in water
Answer:
C. Condensation
Explanation:
When molecules release heat energy, it is called exothermic. In this case, condensation would be an example of this.
Answer: it is C condensation
Explanation: I took the quiz
Hope this helps
Hane a nice day
Could you mark me as branly if you could thank you :)
PLEASE HELP!!
What is the activation energy of this reaction?
50 kJ
100 kJ
150 kJ
200 kJ
Answer:
50 kJ
Explanation:
Activation energy is the energy to go from reactants at 150 to 200 kJ
= 50 kJ
Sulfuric acid solid aluminum hydroxide to form liquid water and a solubale salt. What is the balance equation
Balanced chemical equation for the reaction between sulfuric acid & solid aluminum hydroxide to form liquid water and a soluble salt is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
What is balanced equation?Balanced chemical equations are those in which all entities are present in same amount on both sides of the chemical equation.
Balanced chemical reaction for the given compounds will be shown as:
3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O
Above chemical equation is the balanced equation as all atoms are present in same amount on the left side as well as on the right side of the reaction.
Hence balanced equation is 3H₂SO₄ + 2Al(OH)₃ Al₂(SO₄)₃ + 6H₂O.
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How are seeds beneficial to humans or the environment give me a good Reason!!
Answer:Seeds are great sources of fiber. They also contain healthy monounsaturated fats, polyunsaturated fats and many important vitamins, minerals and antioxidants. When consumed as part of a healthy diet, seeds can help reduce blood sugar, cholesterol and blood pressure
Explanation:
Answer:
Seeds grow plants wherever they fall is in the right condition and can be used as a sort of food for humans
Explanation:
What volume does 0.03 mol of N2 gas occupy at a temperature of 176°C and a pressure of 269 mm Hg?
Answer:
3.12 L
Explanation:
Given the R value that is supplied
you will need to convert to atm from mm Hg and C to K
269 mm / 760 mm/atm = .354 atm
176 c = 449.15
PV = n RT
V = n RT / P = .03 * .08206 * 449.15 / .354 = 3.12 L
8x-47+19=24[tex]8x-47+19=24[/tex]
If 540.0 mL of nitrogen at 9.00 °C is heated to a temperature of 220.0 °C, what will be the new
volume of the gas?
Answer:
943.82 ml
Explanation:
Assuming constant pressure
V1/T1 = V2/T2
T2 * V1/T1 = V2 ( T must be in K units)
(220 + 273.15) * 540 / (273.15 + 9) = 943.8 ml
- How many grams of nitrogen (N2) are needed to react with 435.2 g of oxygen (02) in the following equation?
N2 + O2 → 2NO
N2= 28.02
02= 32
Explanation:
I think the answer is this for a better check mass- mass ratio in stoichiometry lesson
You need to make an aqueous solution of 0.194 M potassium acetate for an experiment in lab, using a 125 mL volumetric flask. How much solid potassium acetate should you add
To prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.
Define molarity of a solution.Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution.
The following data were obtained from the question:
Molarity of potassium acetate = 0.194 M
Volume of solution = 125 mL
Mass of potassium acetate =?
Next, we shall convert 125 mL to L. This can be obtained as follow:
1000 mL = 1 L
Therefore,
125 mL = 0.125 L
Thus, 125 mL is equivalent to 0.125 L.
Next, we shall determine the number of moles of potassium acetate in the solution. This can be obtained as follow:
Molarity of potassium acetate = 0.194 M
Volume of solution = 0.125 L
Moles of potassium acetate =?
Molarity = [tex]\frac{mole}{Volume}[/tex]
Cross multiply
Mole of potassium acetate = 0.194 M × 0.125
Mole of potassium acetate = 0.02425 mole
Finally, we shall determine the mass of potassium acetate
Molar mass of potassium acetate= 98.14 g/mol
Mass of potassium acetate =?
Mole = [tex]\frac{mass}{Molar mass}[/tex]
Mass of potassium acetate =0.02425 × 98.14
Mass of potassium acetate = 2.379895 g
Thus, to prepare 0.194 M potassium acetate, add 2.379895 g of potassium acetate to a 125 mL volumetric flask and fill with water to the mark.
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Identify the most important type(s) of interparticle forces present in the solid c2h6
Intermolecular forces are the forces present between the molecules. The London dispersion forces are the strongest interparticle forces present in the ethane.
What is LDF?London dispersion forces are the intermolecular forces are the temporary forces present between the induced dipole formed by the electrons occupied in the atom.
The electrons of the atom are distributed symmetrically and are dispersed just as the light in quanta. In ethane molecule ionic, and hydrogen forces are absent and only LDF and dipole-dipole are present.
Therefore, LDF and dipole-dipole are the intermolecular forces that are present in ethane.
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Mass = 10 g
Density = Mass/volume
Volume of a cube = (side length)3
Now that you have the side length, determine the volume. Then use the density formula to calculate the density of the material. Record your observations by selecting the data table icon.
You may use a calculator for this section.
Measurement1.1 cm
Answer:
If I understood correctly, your answer should be 0.64 grams
Explanation:
importance achievements of chemistry
Answer:
Chemistry is essential for meeting our basic needs of food, clothing, shelter, health, energy and clear air, water and soilChemistry helps you to understand the world around you Chemistry is a heart of cooking A command of chemistry can keep you safeSome important achievements of chemistry includes discovery of oxygen ;Atomic Theory; Atoms Combine Into Molecules ;Synthesis of Urea; Chemical Structure ; Periodic Table of the Elements; Electricity Transforms Chemicals ; The Electron etc.
Chemistry is a field of science which deals with the chemicals present in laboratory or in our environment o related to human body also.
There are main 3 branches of chemistry that is organic and inorganic and physical chemistry some others are too like analytical chemistry ,industrial chemistry , pharmaceutical chemistry.
Organic chemistry deals with the carbon compounds and hydrogen compound inorganic chemistry deals with the elements of periodic table and pharmaceutical makes medicines for human health care. The reasons for people to pursue discoveries in chemistry because it is the most important part of daily life and related to the human health too.
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The complete question
Mention some important achievements of chemistry
100 POINTS!!
Based on what we have learned match the correct items with their counterparts.
Answer:
I beileve it is NORTH KOREA!! XD actually D.
Explanation:
Classify each of the following species as a lewis acid or a lewis base
Lewis acid and base are the chemical species that accept and donate pairs of electrons. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids, and iodide ion and water are lewis bases.
What are lewis acids and lewis base?Lewis acids are the chemical species that accept the nonbonding electron pair from other chemical species. Hence is an electron-pair acceptor. Boron trifluoride, copper ion, and sulfur dioxide are lewis acids as they can accept an electron to complete an octet.
Lewis bases are the chemical species that donate the non-bonding electron pair to the other chemical species. Hence is an electron-pair donor. Halogen or the iodide and water is a lewis base as it is an electron-rich species.
Therefore, water and iodide is lewis base.
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When a strong acid such as hcl is added to the carbonic acid buffer system, _________
When a strong acid such as HCl is added to the carbonic acid buffer system, more carbonic acid is formed.
What is a buffer system?A buffer system prevent the pH change and resist it when an acid or base is added to the solution.
A buffer system is prepared by weak acid or weak base and their salts. There are three types of buffer system present.
Carbonic acid bufferPlasma protein bufferPhosphate bufferThus, the correct option is b. More carbonic acid is formed.
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What is the mass of K-42 remaining in a 16-g sample
of K-42 after 37.2 h? (1) 1.0 g) 2.0 g (3) 8.0 g
(4) 4.0
The amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
What is radioactivity?The term radioactivity has to do with the spontaneous disintegration of a substance.
To determine the mass of the K-42 that remains, we must have the half life of the isotope or the decay constant and both information are missing.
However, the amount that is Left after 37.2 hr must be less than the original amount of K-42 initially present.
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Helpp me plsss I don't understand this
Take the cuttings from the trees and place them around in different enviornements, if the trees grow up to be the expected size in a different eviornement then the the scientists' claim is correct.
I didn't understand at first either, the question is worded a little strangly, but I believe this should answer the question that was asked.
