The half-life of francium-212 is 19 minutes. How many minutes will it take for 100 gram
of this isotope to decay to 12.5 grams?
Answer:
57 mins
Explanation:
From the question given above, the following data were obtained:
Half life (t₁/₂) = 19 mins
Original amount (N₀) = 100 g
Amount remaining (N) = 12.5 g
Time (t) =?
Next, we shall determine the number of half-lives (n) that wound have elapse for 12.5 g of the sample to remain. This can be obtained as follow:
Original amount (N₀) = 100 g
Amount remaining (N) = 12.5 g
Number of half-lives (n) =?
N = 1/2ⁿ × N₀
12.5 = 1/2ⁿ × 100
Cross multiply
12.5 × 2ⁿ = 100
Divide both side by 12.5
2ⁿ = 100 /12.5
2ⁿ = 8
Express 8 index with 2 as the base
2ⁿ = 2³
n = 3
Finally, we shall determine the time taken for 100 g of the isotope to decay to 12.5 g. This can be obtained as follow:
Half life (t₁/₂) = 19 mins
Number of half-lives (n) = 3
Time (t) =?
t = n × t₁/₂
t = 3 × 19
t = 57 mins
Thus, it will take 57 mins 100 g of the isotope to decay to 12.5 g.
03:58:40
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result?
Total energy increases.
Stored energy decreases.
Energy of motion decreases.
Total energy decreases.
Answer:
If the kinetic and potential energy in a system are equal, then the potential energy increases. What happens as a result? Total energy increases.
Answer:
its C energy of motion decreases
Explanation:
i got it right on the edge 2021 unit test UvU
and if u dont trust me then get it rong with the other person （︶^︶）
What is unique about the way that transition metals form compounds?
a. They don't form compounds
C. They can form bonds with the electrons in the
two outer-most shells
b. They are the most reactive
d. They can donate all of their electrons
Answer:
A. They don't form compounds
Explanation:
High density: The strong bonding between the atoms in transition metals cause them to be tightly held together, creating a high density. Colored compounds: Transition metals tend to form more colored compounds than other elements, either in solid form or dissolved in a solvent.Answer:
they can form bonds with the electrons in the two outer most shells
Li²O, # of Elements and Atoms
Answer:Lithium atomic orbital and chemical bonding information. There are also tutorials on the first thirty-six elements of the periodic table includes: Li²O
In a lab, a student calculates the density of a piece of silver to be 8.74 g/cm3. The actual density of silver is 10.49 g/cm3. What was the student's percent error? Round your answer to 1 decimal place and be sure to include units
Answer:
16.7%
Explanation:
From the question given above, the following data were obtained:
Measured density = 8.74 g/cm³
Actual density = 10.49 g/cm³
Percentage error =?
The percentage error of the student can be obtained by using the following formula:
Percentage error = | measured – Actual | / Actual × 100
Percentage error = | 8.74 – 10.49 |/10.49 × 100
Percentage error = 1.75 / 10.49 × 100
Percentage error = 16.7%
Therefore, the percentage error of the student is 16.7%
Plisss help I’ll give you brainless Waves can be identified in many different ways. Using the diagram below, identify
which property of a wave is shown by the part of the diagram labeled F?
Answer:
Wavelength
Explanation:
3. A solution that can hold more solute is called
Answer:
A solution that can hold more solute is called. saturated.If there are 50 grams of a radioactive element how much will be present after 1 half life,2,half life, and 3 half life
Answer:
6.25g
a half life will take away half of the element so you wouldjut divide by 2 three times
Explanation:
Answer:
1HL- 25g, 2HL- 12.5g, 3HL- 6.25g
Explanation:
When trying to calculate Half Lives (HL) you want to make sure that you divide by 2 every time as a half life cuts the amount in half so 50/2=25(1HL) 25/2=12.5(2HL) 12.5/2=6.25(3HL) and of course dont forget the unit which is grams
Complete the statements about the law of conservation of momentum.
The law of conservation of momentum states that the total momentum of interacting objects does not ___. This means the total momentum ___a collision or explosion is equal to the total momentum _____ a collision or explosion.
Answer:
change
before
after
Explanation:
have a nice day :)
What is the name of the ionic compound CaO?
calcium oxygen
calcium oxide
calcium(I) oxide
calcium(II) oxide
Answer:
Calcium Oxide.
Explanation:
Ca + O = CaO.
Calcium + Oxygen = Calcium Oxide.
The name of the ionic compound CaO is calcium oxide. The correct option is b.
What are ionic compounds?Positively charged ions, known as cations, and negatively charged ions, known as anions, make up ionic compounds, which are neutral substances.
The name of the cation is written first, followed by the name of the anion, for binary ionic compounds (ionic compounds that only contain two types of elements).
Calcium oxide is a chemical compound that is also called quicklime. It is used as a crystalline solid and is caustic in nature. It is used as desulfurization for the material. It is also called burnt lime.
The compound contains calcium and oxygen, whose symbols are Ca and O.
Ca + O = Cao
Therefore, the correct option is b. calcium oxide.
To learn more about calcium oxygen, refer to the link:
https://brainly.com/question/1593920
#SPJ6
Which of the following was NOT used in support of the continental drift hypothesis?
fossil evidence
fit of South America and Africa
mountain ranges across continents
differences in ocean salinity levels
Answer:
fossil evidence
fit of South America and Africa
Explanation: can i have brainlist please
Which statement defines the heat capacity of a sample?
the temperature of a given substance
the temperature that a given sample can withstand
the quantity of heat that is required to raise the sample’s temperature by 1°C (or Kelvin)
the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure
Answer:
b
Explanation:
Answer:
D. the quantity of heat that is required to raise 1 g of the sample by 1°C (or Kelvin) at a given pressure
Explanation:
Magnetic Quantum Number tells you what? how many orbitals are in s, p ,d?
what are the two models of arrangement for the first periodic table?
Answer:
the modals of arrangement for first periodic table was. increasing atomic mass and grouping together of elements having similar properties
A supercomputer, nicknamed Roadrunner, built by IBM for the Los Alamos National Labs can perform about 1.03 petaflop/s (1 petaflop is 1015 calculations). Determine how many seconds it would take this computer to count a mole of things. Convert this figure into years.
Answer:
18.5 years
Explanation:
(6 x 10^23)/(10^15 x 1.03 x 3600 x 24 x 365)
Hope this helps!
What kind of daughter cells result from meiosis, genetically identical or different from parent cell?
Answer:
DUE IN A FEW!!!!!! PLS HELP
Answer:
the answer is is C 465 grams
Please help me, Thank you!
Answer:
B. Opposite
Explanation:
When one electron is transferred from sodium to chlorine, a pair of ions with oppositely charged ions is formed.
The electrostatic attraction between the ions forms a covalent bond between them.
When atoms lose or gain electrons, they become ions due to the charge imbalance within them. If sodium lose an electron, it becomes positively charged. when the electron is gained by chlorine, it becomes negatively charged These oppositely charged ions combined to form the ionic compound.Give a brief background of the development of nuclear power.
Answer:
Nuclear began in the 1930s, when physicist Enrico Fermi first showed that neutrons could split atoms. Fermi led a team that in 1942 achieved the first nuclear chain reaction, under a stadium at the University of Chicago
what mechanical weathering process is used when water turns to ice?
Answer:
frost wedging
Explanation:
Frost wedging is the process by which water seeps into cracks in a rock, expands on freezing, and thus enlarges the cracks. The effectiveness of frost wedging is related to the frequency of freezing and thawing.
I wish this helps you
does tin or lead have a larger atomic radius??
What does the Atomic Number tell you? the amounr of electronstprorons
How can you find the number of electron shells by looking at an Atom's location on the Periodic Table?
Answer
Atomic number or proton number tells us the number of protons found in the nucleus of every atom of that element
Explanation:
What is diffusion?
Class 9th
Chemistry
Diffusion is the movement of a substance from an area of high concentration to an area of low concentration . Diffusion happens in liquids and gases because their particles move randomly from place to place . Diffusion is an important process for living things ; it is how substances move in and out of cells .
Pls follow me and Mark as brainlest :-)
Answer:
diffusion is a means of transport, which occurs through cells . for example exchange of gases that takes place in alveoli occurs due to diffusion.
Explanation:
in diffusion the object or fluid moves from region of higher concentration to the region of lower concentration.
how can you tell which compound in a solution is the solvent?
(own words please)
Answer:
The way you can know which compound in a solution is a solvent is by usually just determining which substance is a solute and which is a solvent. The solute is when it is dissolved and it takes on the characteristics of the solvent.
Explanation:
Hope this helps!
Is nitrogen an element or compound?
Answer:
Nitrogen is an element that can combine with itself or with other elements to make different compounds. For instance nitrogen gas, N2, is a compound made when two nitrogen atoms form a chemical bond.
Explanation:
Answer:
element
Explanation:
it can combine with itself or with other elements to make compounds
what is ionizable hydrogen and why we say it replaceable hydrogen
Answer:
only hydrogen atoms that are part of a highly polar covalent bond are ionizable. The hydrogen atom is attracted to the lone pair of electrons in a water molecule when HCl is dissolved in water. The result is that the H−Cl bond breaks, with both bonding electrons remaining with the Cl, forming a chloride ion.
Explanation:
Answer:
In an acid molecule, hydrogen atoms may be substituted by metal atoms.
Explanation:
It is ionizable only to hydrogen atoms that are part of a strongly polar covalent bond. As HCl is dissolved in water, the hydrogen atom is drawn to the lone pair of electrons in a water molecule. The effect is that the H-Cl bond splits, with the Cl remaining with both bonding electrons, forming a chloride ion.
Elimination of HBr from 2-bromobutane affords a mixture of but-1-ene and but-2-ene. With sodium ethoxide as base, but-2-ene constitutes 81% of the alkene products, but with potassium tert-butoxide, but-2-ene constitutes only 67% of the alkene products. Offer an explanation for this difference.
Answer:
see explanation
Explanation:
The elimination reaction involving 2-bromobutane leads to the formation of two products with the predominant product depending on the nature of the base used.
With a bulky base such as potassium tert-butoxide, the secondary carbon atom is inaccessible due to steric hindrance. Therefore, but-1-ene predominates (higher percentage).
However, when a less bulky base such as sodium ethoxide is used, the secondary carbon atom is more easily accessible, leading to the predominant formation of the thermodynamically favourable but-2-ene.
why do you wash lead (II) sulfate with distilled water in the preparation of lead sulfate?
Answer:
Explanation:
Mineral
The naturally occurring mineral anglesite, PbSO4, occurs as an oxidation product of primary lead sulfide ore, galena.
Basic and hydrogen lead sulfates
A number of lead basic sulfates are known: PbSO4·PbO; PbSO4·2PbO; PbSO4·3PbO; PbSO4·4PbO. They are used in manufacturing of active paste for lead acid batteries. A related mineral is leadhillite, 2PbCO3·PbSO4·Pb(OH)2.
At high concentration of sulfuric acid (>80%), lead hydrogensulfate, Pb(HSO4)2, forms.[4]
Chemical properties
Lead(II) sulfate can be dissolved in concentrated HNO3, HCl, H2SO4 producing acidic salts or complex compounds, and in concentrated alkali giving soluble tetrahydroxidoplumbate(II) [Pb(OH)4]2− complexes.
PbSO4(s) + H2SO4(l) ⇌ Pb(HSO4)2(aq)
PbSO4(s) + 4NaOH(aq) → Na2[Pb(OH)4](aq) + Na2SO4(aq)
Lead(II) sulfate decomposes when heated above 1000 °C:
PbSO4(s) → PbO(s) + SO3(g)
1. List the types of fronts found on this map
Answer:
Cold Front. A side view of a cold front (A, top) and how it is represented on a weather map (B, bottom). ...
Warm Front. ...
Stationary Front. ...
Occluded Front.
Oh my god sadddddddddddddddddd
Answer:
sad? that your giving out free points?
Explanation:
Answer:
what wrong
tell i can help u
Explanation:
