Answer:
After 90 minutes 5.15625 g amount left from total of 165 g.
Explanation:
Given data:
Technetium-104 half life = 18.0 min
Total amount of sample = 165 g
Amount left after 90.0 min = ?
Solution:
First of all we will calculate the number of half lives passes.
Number of half lives = T elapsed / Half life
Number of half lives = 90 min /18.0 min
Number of half lives = 5
Amount left:
At time 0 = 165 g
At first half life = 165 g/ 2= 82.5 g
At 2nd half life = 82.5 g/2 = 41.2 g
At 3rd half life = 41.2 g/ 2 = 20.625 g
At 4th half life = 20.625 g/ 2 = 10.3125 g
At 5th half life = 10.3125 g /2 = 5.15625 g
Thus, after 90 minutes 5.15625 g amount left from total of 165 g.
1. The formula of a compound is M(OH)2. Given that the M, of the compound is 98, calculate the A, of M.
A. 64
B. 16
C. 32
D. 8
Answer: C
Explanation:
1. Given the image below, which calculation will NOT give you the correct average atomic mass?
A. (12+12+12+12+12+12+13+13+13+13)
10
B. (60⋅12)+(40⋅13)
C. (0.6⋅12)+(0.4⋅13)
D.
Answer: I think it’s either C or Dz
Explanation:
Due how it’s calculated.
The calculation that will not give the correct average atomic mass is (60⋅12)+(40⋅13).
The average atomic mass is obtained as the sum of the products of the relative abundance of each isotope multiplied by its mass.
There are 6 C-12 isotopes and 4 C-13 isotopes. This gives a total of 10 isotopes of both types.
All calculations of average atomic mass are correct except (60⋅12)+(40⋅13).
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A proton in a linear accelerator has a de Broglie wavelength of 132 pm. What is the speed of the wavelength?
Answer:
The speed of wavelength is 3.0 ×10³ m/s.
Explanation:
Given data:
De Broglie wavelength = 132 pm (132×10⁻¹² m)
Speed of wavelength = ?
Solution:
Formula:
λ = h/mv
λ = wavelength
h = planck's constant
m = mass of proton
v = speed
now we will put the values in formula.
132×10⁻¹² m = 6.63 ×10⁻³⁴ j.s / 1.67 ×10⁻²⁷ kg × v
v = 6.63 ×10⁻³⁴ j.s / 1.67 ×10⁻²⁷ kg × 132×10⁻¹² m
j = kg m²/s²
v = 6.63 ×10⁻³⁴ kg m²/s / 1.67 ×10⁻²⁷ kg × 132×10⁻¹² m
v = 6.63 ×10⁻³⁴ kg m²/s / 220.44 ×10⁻³⁹ kg.m
v = 0.03×10⁵ m/s
v = 3.0 ×10³ m/s
The speed of wavelength is 3.0 ×10³ m/s.
Which action will decrease the gravitational force between two objects?
A. Adding mass to one of the objects
B. Increasing the charge on one of the objects
C. Reducing the masses of the objects
D. Moving the objects closer together
Answer: C
Explanation:
The force of gravity is proportional to the amount of mass in the system, and is inversely proportional to the separation distance between the two masses.
Adding mass to one of the objects would increase the gravitational field it produces, which in return increases the force of gravity.
Increasing the charge of one of the objects would technically add mass to the system, but it can be considered negligible. The adding of charge would cause an attraction between the two objects, but that is not the gravitational force. It is the Coulomb force.
Reducing the mass of one of the objects would decrease the gravitational field it produces, which would cause the force of gravity to decrease. This is the answer.
Moving the objects closer would cause the denominator of the force equation to decrease. A smaller denominator would cause the equality to increase, aka the gravitational force.
[tex]F=GMm/r^2[/tex]
which statements describe density? chech all that apply
Is there a relationship between low-income neighborhoods and obesity? What do you think are some of the reasons?
Answer:
cheaper foods are usually more processed and unhealthy, therefore, poorer people are likelier to be obese.
Explanation:
What is the missing force?
Answer:
The missing force is the 17 newton
Explanation:
What would happen if organ system failed to work together
Answer:
if organ systems failed to work together then the body will not function properly and we should not able to do a simple work and suffer from many others diseases.
The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and OH functional groups present.
a. True
b. False
Which of the following helps protect species from extinction?
Question 4 options:
laws and policies
wildlife refuges
conservation efforts
all of the above
Answer:
all of the above :)
have a nice day !
Explanation:
word equation into balanced formula equation carbon+oxygen=carbon dioxide
Explanation:
hope it helps, Godbless
Answer:
C + O = CO2
this is the correct answer
If you were to repeat this experiment using an entire 16.5 g beer can and get the
same percent yield, what mass of alum would you expect? (I got .126% yield)
The mass of alum expected is mathematically given as
Ma= 365.904 g
Question Parameters:
Beer can mass (aluminium metal ) = 16.5 g
% yield = 126 % = 1.26
Generally, the equation for the Mass of alum is mathematically given as
M=Beer can mass * 1 g of alum produce
M= 16.5 x 17.6
M= 290.4 g
therefore, the Mass of alum expected
Ma= % yield x mass of alum
Ma= 1.26 x 290.4
Ma= 365.904 g
In conclusion, the mass of alum expected is
Ma= 365.904 g
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Stoichiometry: mole/ mole help
Answer:
0.531 moles of CO₂ are formed.
Explanation:
Given data:
Number of moles of CO = 0.531 mol
Number of moles of CO₂ formed = ?
Amount of oxygen = excess
Solution:
Chemical equation:
2CO + O₂ → 2CO₂
Now we will compare the moles of CO with CO₂.
CO : CO₂
2 : 2
0.531 : 0.531
Thus, 0.531 moles of CO₂ are formed.
A student decided to use the titration technique to find out the concentration of
Acetylsalicylic acid (ASA) from a sample that arrived at the laboratory. He
took three samples of 0.1830, 0.1903 and 0.1851 (grams) and titrated with NaOH
0.497 M and spent on the titration 16.0 – 18.3 and 17.3 ml respectively in each
sample. Calculate the percentage of acetylsalicylic acid in the samples. THE
Sample packaging says contain 92% AAS, calculate absolute and relative error
in this degree.
C8H7O2COOH(aq) + NaOH(aq) C8H7O2COONa(aq) + H2O(l)
From the mole ratio of the reaction, the mass of ASA reacted is greater than the mass of ASA sample indicating an error in some of the data provided.
What is the titration technique?Titration is a technique in analytical chemistry in which the volume of solution A of known concentration needed to react with another solution B of unknown concentration is used to determine the unknown concentration of the solution B.
The equation of the reaction between acetylsalicylic acid (ASA) and NaOH is given below:
C8H7O2COOH(aq) + NaOH(aq) C8H7O2COONa(aq) + H2O(l)1 mole of ASA reacts with one mole of NaOH
Molar mass of ASA = 180 g/mol
For first sample:
Volume of NaOH = 16.0 mL = 0.016 L
Moles of NaOH reacted = 0.016 × 0.497 = 0.007952 moles
Therefore, moles of ASA reacted = 0.007952 moles
Mass of ASA reacted = 1.43136 g
However, mass of ASA sample = 0.1830 g
The mass of ASA reacted is greater than the mass of ASA sample.
This means there is an error in the data provided.
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8. A fossil plant that helps support the theory of continental drift is ____.
a. Mesosaurus
b. Glossopteris
c. Glomar
d. Pangaea
Answer:
b.
Explanation:
How does latitude
affect climate?
Answer:
as the latitude increases, the intensity of the solar energy that strikes an area decreases,and climates become cooler
Explanation:
The higher the elevation the cooler the air therefore the climate becomes colder.
acid rain is created when chemicals in _____ react with ____.
A. Smog and water vapor
B. Fertilizers and water
C. Fertilizers and sunlight
D. Smog and sunlight
Answer:
A:smog and water vapor
Explanation:
Smog and water vapor
The answer is A: Smog . . . Water Vapor
Molecular compounds result from covalent bonding which are called _______.
This is for high school physical science
Answer:
Diatomic Molecule
Explanation:
5. When 8.00 g of Pb(C2H3O2)2 * xH2O are heated, 1.14 g of H2O are driven off. Find the chemical formula and the name of the hydrate
Answer:
Please look in the paper ! <3
Calculate the wavelengths (in Å) for the first six Balmer lines (Ha, Hb, Hg, Hd, He, and Hz)
Explanation:
Transition of n 3→2 6→2
Name -H-α / Ba-α- H-δ- / Ba-δ
Wavelength (nm, air) -656.279 -410.1734
Energy difference (eV)- 1.89 -3.03
Color- Red -Violet
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WHOEVER RESPONDS FIRST WILL GET MARKED BEST!
People's pinkie fingers can either be bent or straight. The allele for bent pinkie fingers is dominant (B). The allele for straight pinkie fingers is recessive (b). Match the genotype (in letters) to the correct genotype (in words). Some answer choices may not be used at all
look at the picture please.
Explanation: When the little finger bends in towards the palm and can't be straightened out, it is known as streblomicrodactyly, streblodactyly or camptodactyly.
Little fingers range from perfectly straight to bending inwards at a sharp angle. It is not clear whether fingers fall into two discrete categories or there is a continuous range of pinky angle. Hersh et al. (1953) said that bent little fingers bend inward at an angle of 15 to 30 degrees. They found that only 4 out of a sample of 4,304 people had what they considered to be bent little fingers
If only extremely bent little fingers are considered, then the bent little finger trait is too rare to be useful for illustrating basic genetics in classrooms. If fingers with a more moderate bend are counted, then there is no clear dividing line between bent and straight, plus no evidence that the trait is genetic. In either case, you should not use bent little finger to demonstrate basic genetics.
Bent Little Finger : A dominant allele results in the end joint of the little finger of each hand bending inward. Straight little fingers are a result of the recessive genotype.
Place your hands on a flat surface, palms down, and relax. Check to see if the first joints of your little fingers are bent or straight.
There you go
Hope that helps :)
PS the picture is too fuzzy to read
what is the force needed to accelerate a sled with a mass of 2 kg at a rate of 3.0/s²
A. 6.0N
B. 3.0N
C. 1.5N
D. 3.0N
(help asap please I will give brainliest to the correct answer )
Answer:
The answer is option AExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
Force = mass × accelerationFrom the question
mass = 2 kg
acceleration = 3 m/s²
We have
Force = 2 × 3
We have the final answer as
6.0 NHope this helps you
You add 0.59 mL of n-propanol (0.803 g/mL, 60.1 g/mol) to an excess of acetic acid to create the pear ester propyl acetate (102.1 g/mol). If you obtain 0.54 grams of the product, what was your percent yield
The percentage yield of the reaction between n-propanol and excess of acetic acid is 67.5%
How to determine the mass of n-propanolVolume = 0.59 mL Density = 0.803 g/mLMass of n-propanol =?Mass = Density × Volume
Mass of n-propanol = 0.803 × 0.59
Mass of n-propanol = 0.47 g
Balanced equationSee attached photo
Molar mass of n-propanol = 60.1 g/mol
Mass of n-propanol from the balanced = 1 × 60.1 = 60.1 g
Molar mass of propyl acetate = 102.1 g/mol
Mass of proply acetate from the balanced equation = 1 × 102.1 = 102.1 g
SUMMARY
From the balanced equation,
60.1 g of n-propanol reacted to produce 102.1 g of propyl acetate
How to determine the theoretical yieldFrom the balanced equation,
60.1 g of n-propanol reacted to produce 102.1 g of propyl acetate
Therefore,
0.47 g of n-propanol will react to produce = (0.47 × 102.1) / 60.1 = 0.8 g of propyl acetate
How to determine the percentage yield Actual yield of propyl acetate = 0.54 gTheoretical yield of propyl acetate = 0.8 gPercentage yield =.?Percentage yield = (Actual / Theoretical) × 100
Percentage yield = (0.54 / 0.8) × 100
Percentage yield = 67.5%
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How many atoms are in 3.5 L of Neon at STP? Show your work
Answer:
0.1734
this is the answer to the question
Describe the structure of an Atom (HELP!)
Answer:
The answer is A.
Explanation:
Neutrons and protons are located in the dense middle of the atom called the nucleus, and electrons are located on the electron cloud located outside of the nucleus.
How do you know if the girl your dating is into the size or onto personality? 100 POINTS
Answer:
here
Explanation:
My guess is if she's into you for your size she's gonna want to have s## alot, but if she's into your personality she wants to hang out with you and compliments you this is my guess so sorry if this isnt good
Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop of dishwashing detergent is added near it?
Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
Soap makes the water less viscous making the paperclip sink.
Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink.
Soap makes the water more viscous allowing the paperclip to continue to float.
Answer: Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
Explanation: Answer A
Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float.
How does soap affect the intermolecular forces of water?A cleaning soap bubble has a polar give up and a nonpolar give up. Water is a polar molecule. The polar cease of the cleaning soap molecules are attracted to every other. The nonpolar ends of the soap molecules stand proud of the water and assist preserve bubbles collectively.
What happens while the soap is added to water?Adding cleaning soap lowers the water's surface anxiety so the drop turns weaker and breaks apart sooner. Making water molecules stick collectively less is what helps soaps easy dishes and garments greater without problems.
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#SPJ2
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components.
a. True
b. False
Answer:
true
Explanation:
It is because it appears uniformly in the eye
What happens when there is a change in the DNA of a gene
Answer:
DNA is a dynamic and adaptable molecule. As such, the nucleotide sequences found within it are subject to change as the result of a phenomenon called mutation. Depending on how a particular mutation modifies an organism's genetic makeup, it can prove harmless, helpful, or even hurtful.
Explanation:
Which of the following actions does the Commissioner of Insurance NOT have the power to conduct? O Activate insurance companies' financial reserves O Issue a cease-and-desist order Issue insurance licenses O Regulate the business of insurance in this state
The insurance commissioner does not have the right to activate insurance companies' financial reserves.
Functions of the commisioner for insuranceThe insurance commisioner is soely in charge of the control of the bussiness of insurance in the company and seeks to ensure that prudent insurance policies are implemented by the government.
However, the insurance commissioner does not have the right to activate insurance companies' financial reserves.
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