Base your answer on the information below. Polonium-210 occurs naturally, but is scarce. Polonium-210 is primarily used in devices designed to eliminate static electricity in machinery. It is also used in brushes to remove dust from camera lenses. Polonium-210 can be created in the laboratory by bombarding bismuth-209 with neutrons to create bismuth-210. The bismuth-210 undergoes beta decay to produce polonium-210. Polonium-210 has a half-life of 138 days and undergoes alpha decay. Determine the total mass of an original 28.0-milligram sample of Po-210 that remains unchanged after 414 days. Show the math setup, the arrows, and your answer for full credit.
Answer:
3.5 milligram
Explanation:
From;
N/No = (1/2)^t/t1/2
Where;
N = amount of Po-210 that remains unchanged after 414 days
No = 28.0 milligram of Po-210 originally present
t = 414 days
t1/2 = half life of Po-210 = 138 days
Substituting values;
N/28 = (1/2)^414/138
N/28 = (1/2)^3
N/28 = 1/8
8N = 28
N = 28/8
N = 3.5 milligram
Which is a better estimate for the volume of a fish bowl?.
1 gallon
1 cup
Answer: 1 gallon
Explanation:
Answer:
1 gallon
Explanation:
because gallons are constisting of cups and 1 cup wont be enough for a fish to swim
What happens to the velocity of an object when balanced forces act on it?
a.
There will be no change
c.
There will be negative acceleration
b.
There will be positive acceleration
d.
Velocity will change, but not acceleration
Answer:
There will be negative acceleration.
Explanation:
I majored in Physics
Answer:
A. There will be no change
Explanation:
Velocity is defined as the directional speed of an object in motion. Balanced forces do not result in any change in motion. Thus, there would be no change in velocity.
the diagrams represent the same number of particles of a gas in 2 containers D snd E, Which have different volume. the two containers are at the same temperature.
in which container will the pressure be higher ?explain your answer
In container E, the pressure will be higher than container D
Further explanationGiven
Container with :
the same particlesthe same temperaturethe different volumeRequired
The higher pressure container
SolutionBoyle's Law stated that :
At a constant temperature, the gas volume is inversely proportional to the pressure applied
[tex]\rm p_1V_1=p_2.V_2\\\\\dfrac{p_1}{p_2}=\dfrac{V_2}{V_1}[/tex]
From the diagram (picture), it shows that the volume of container D is greater than container E, so the pressure applied to container D will be less than the pressure applied to container E
Please help-- 15 pts!
What kind of liquid will have the highest vapor pressure value?
a liquid with weak intermolecular forces and a low temperature
a liquid with weak intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a high temperature
a liquid with strong intermolecular forces and a low temperature
Happy Holidays!!
Answer:
a liquid with weak intermolecular forces and a high temperature
Explanation:
According to encyclopedia Britannica, "Vapour pressure is a measure of the tendency of a material to change into the gaseous or vapour state, and it increases with temperature. The temperature at which the vapour pressure at the surface of a liquid becomes equal to the pressure exerted by the surroundings is called the boiling point of the liquid."
This implies that the vapour pressure of a liquid tends to increase as the temperature of the liquid increases. Recall that vapour pressure also depends on the magnitude of intermolecular forces. The greater the magnitude of intermolecular forces, the lower the vapour pressure hence water has very much higher vapour pressure than ethane.
Answer:
A liquid with weak intermolecular forces and a high temperature
Explanation:
I just took the test and got it right
A ground water tank has its height 2m. Calculate the pressure at its bottom when it is completely filled with water.
The pressure at the bottom : 19600 N/m²
Further explanationGiven
A ground water tank has its height 2m
Required
The pressure at its bottom
Solution
Hydrostatic pressure is the pressure caused by the weight of a liquid.
The weight of a liquid is affected by the force of gravity.
The hydrostatic pressure of a liquid can be formulated:
[tex]\large{\boxed{\bold {P_h ~ = ~ \rho.g.h}}[/tex]
Ph = hydrostatic pressure (N / m², Pa)
ρ = density of liquid (kg / m³)
g = acceleration due to gravity (m / s²)
h = height / depth of liquid surface (m)
ρ = density of water (kg / m³) = 1000
g = acceleration due to gravity = 9.8 m/ sec²
The pressure
[tex]\tt P=1000\times 9.8\times 2=19600~N/m^2[/tex]
Which one of the following statements about s orbitals is incorrect ?
Group of answer choices
Which of the following steps will slow down the reaction between coal and oxygen?
Answer:
decrease temperature of the oxygen
Explanation:
Answer: I believe it it decrease temp of oxygen
Explanation:
A species of kangaroo has a diploid chromosome number of 16. After meiosis, to develop the kangaroo’s sperm or egg, the haploid number would be
. When fertilization occurs, the zygote would again have 16 chromosomes.
Answer:
Just to prove that the persons answer on top of mine is correct :D
Explanation:
Answer:
Explanation:
8
Please help-- 16 pts!
A sample of oxygen gas (O2) applies 152 mmHg pressure on the walls of an 11.2 L steel container at 273 K. Assume ideal gas behavior. The ideal gas constant is 62.36 (L·mmHg)/(K·mol), and the molar mass of oxygen gas is 32 g/mol.
How many grams of oxygen gas are in the steel container?
16 g
1.6 g
32 g
3.2 g
Answer:
B) 1.6 g
Explanation:
**********************************************
Convert 4.92L of hydrogen at STP to moles
Answer:
0.22moles
Explanation:
Given parameters:
Volume of gas = 4.92L
Unknown:
Number of moles = ?
Condition = STP
Solution
At STP, the number of moles of a given gas is expressed as;
Number of moles = [tex]\frac{volume given}{22.4}[/tex]
Number of moles = [tex]\frac{4.92}{22.4}[/tex] = 0.22moles
True or false: an amplifier can adjust the amplitude
Answer:
ᴛʀᴜᴇ.................
Jordan places a hot spoon into a container of ice
cream. How does this help him scoop out the ice
cream?
Answer:
It melts some of the ice cream and it makes it easier for him to scoop the ice cream out
Explanation:
Hi! Can you help me with this?
Is a hydrogen gas a element, compound, or mixture?
Answer:
Hydrogen gas (H2) is a molecule, but not a compound because it is made of only one element. Water (H2O) can be called a molecule or a compound because it is made of hydrogen (H) and oxygen (O) atoms.
Explanation:
Hope this helped!!!
-BB
please mark me brainly
Answer:
It's an element. :)
Explanation:
Please help me answer this question.
Explanation:
Hydrochloric acid is HCl.
Hydrogen is H2.
Mole ratio is the numbers infront of them, which is 6 : 3.
Answer:Hydrochloric acid is HCl.
Hydrogen is H2.
Explanation:
Kelle & Jenn are at a pool. Kelle is standing on the high diving board while Jenn is standing on the low diving board. Assuming the difference in weight/mass is negligible, which of the following statements accurately describes this relationship?
A. Kelle has a greater potential energy than Jenn.
B. Jenn & Kelle have equal potential energies.
C. Jenn has a greater potential energy than Kelle.
D. Kelle has a greater kinetic energy than Jenn.
Answer:
A. Kelle has a greater potential energy than Jenn.
Explanation:
We need to apply the kinetic energy equation here to solve this problem: P.E. = mgh, where m is the mass in kilograms, g is the acceleration due to gravity (9.8 m / s2 at the surface of the earth) and h is the height in meters.
The problem tells us, however, that mass/weight is negligible; therefore, the only thing that really matters here is the height. Kelle is higher up, so she would have a greater potential energy than Jenn, who is lower.
Iron (ii) chloride solution is changed into Iron(iii) chloride solution after sometime,
give a reason. ( 26Fe)
Answer:
See explanation
Explanation:
When left to stand, a solution of Iron II chloride is converted to Iron III chloride by oxidation in air.
The Iron III chloride is composed of weak field ligands in its coordination sphere. These weak field ligands mostly occur in a high spin configuration hence, the central iron atom can be converted from Fe[(H20)6]^2+ .2Cl^-(high spin d6) to Fe^3+[(H20)6]^3+ .3Cl^-(high spin d5).
I need answers
Question 2 (2 points)
Which of the following is an example of BALANCED forces?
A ball rolling uphill
O A ball sitting motionless on the ground
O A ball bouncing on the ground
O A ball rolling downhill
Answer:
Concepts: Physical Forces
In order for an object to be balanced, then it must be in equilibrium which means that no additional forces are being exerted. A ball sitting motionless would result in a balanced force that exerts no additional forces.By adding electrons to an uncharged object, the object *
becomes negatively charged
becomes positively charged
becomes energized
changes color
Answer:
becomes negatively charged
Explanation:
this is because when an object receives electrons it becomes negatively charged and the object that loses electrons becomes positively charged.
Answer:
First one because by adding more electrons it makes something more negative. So it becomes negatively charged
The Calories on a food label indicate the
amount of energy the food contains in
one serving. Which form of energy is
contained in food?
Answer:
chemical energy
Explanation:
100 cm3 of hydrogen is mixed with 25 cm3 of oxygen at a temperature of 150qC. The gases react as shown in the equation below. 2H2(g)+ O2(g) o 2H2O(g) The total volume of gas present at the end of the reaction is A 50 cm3 B 100 cm3 C 125 cm3 D 150 cm
Answer:
B 100 cm3
Explanation:
The balanced equation is given as;
2H2(g)+ O2(g) --> 2H2O(g)
From the reaction stochiometry, 2 cm3 of H2 would react with 1 cm3 of O2 to form 2 cm3 of H2O
Before Reaction --> 100cm3 of H2, 25cm3 of O2, 0cm3 of H2O
During Reaction --> 50cm3 of H2, 25cm3 of O2, 50cm3 of H2O
(Oxygen is sed uup in the reaction)
After Reaction --> 50cm3 of H2, 0cm3 of O2, 50cm3 of H2O
Total volume left = Unreacted H2 (50cm3) + 50cm3 of H2O formed
Total Volume left = 50 + 50 = 100cm3
The total volume of gas present at the end of the reaction is 100 cm³
What is a chemical reaction?a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
The balanced equation is given as;
2H₂(g)+ O₂(g) → 2H₂O(g)
From the reaction stoichiometry, 2 moles of H₂ would react with 1 mole of O₂ to form 2 moles of H₂O
Before Reaction: 100cm³ of H₂, 25cm³ of O₂, 0cm³ of H₂O
During Reaction: 50cm³ of H₂, 25cm³ of O₂, 50cm³ of H₂O
(Oxygen is used up in the reaction)
After Reaction: 50cm³ of H₂, 0cm³ of O₂, 50cm³ of H₂O
Total volume left = Unreacted H₂ (50cm³) + 50cm³ of H₂O formed
Total Volume left = 50 + 50 = 100cm³
Hence, The total volume of gas present at the end of the reaction is 100 cm³
To learn more about chemical reactions, click here:
https://brainly.com/question/6876669
If you could show work
We need to balance the equation
[tex]\sf \bullet\quad H_2 + O_2 \longrightarrow H_2O [/tex]
By adding 2 moles of [tex]\sf H_2 [/tex] on the both sides
[tex]\sf \bullet \quad 2H_2+O_2 \xrightarrow{\;By\:balancing\;} H_2O[/tex]
Hence, balanced !
Balance the equation
__Ni(CIO)3 → _NiCl2+ _02
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Lesson 4.07
Question 9 options:
True
False
Answer:
that is a false sentence
Answer:
I'm sure you've already finished the est but the real answer is true, I took the k12 test and got that one correct, hope this helps anyone!
Explanation:
A stretched out rubber band is an example of:
A. kinetic energy
B. potential energy
C. gravitational energy
D. light energy
Ethyl alcohols formula is C2H50H,what is this?
a.A element
b.A compound
c.A mixture
Explanation:
C2H5OH is ethanol, which is a compound.
Pleaseee help If you understand....
Answer:
def don't understand that sorry
Please help me:(
Mr. Jacob is teaching his class about the various changes of Earth’s Surface over time. He wants his students to explain the evidence that supports the claim that fossils can show proof of the changing of Earth’s surface. Which of the following statements best explains how students can use fossils as evidence?
Question 4 options:
Plant fossils can be used as evidence of Earth’s surface changing because similar fossils found in various locations supports that Earth was once a supercontinent.
Plant fossils can be used as evidence of Earth’s surface changing because different fossils found in one specific location on earth supports that earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because different fossils found in various locations supports that Earth was once a supercontinent.
Animal fossils can be used as evidence of Earth’s surface changing because similar fossils found in one specific location of earth supports that Earth was once a supercontinent.
Answer:
A
Explanation:
pls help me with science
A silver ring reacts with compounds containing sulfur in the air to form silver sulfide, a black substance that makes up the tarnish on the surface of silver objects. To remove the tarnish from the ring, students placed it in a pan lined with aluminum foil and added hot water. Baking soda was added to the hot water and stirred. Students made observations about the process. Which observation of this process provides evidence of a chemical reaction?
Question 4 options:
A Hot water heated the aluminum foil.
B The liquid solution changed color.
C The pan was lined with aluminum foil.
D The hot water cooled.
Answer:
c lined with aluminum foil