Answer:
heat transfer
Magnetic Quantum Number tells you what? how many orbitals are in s, p ,d?
DUE IN A FEW!!!!!! PLS HELP
Answer:
the answer is is C 465 grams
does tin or lead have a larger atomic radius??
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.
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 :)
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)
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
Large food molecules are broken down into glucose the cells can use in the __________ system.
Answer:
digestion
Explanation:
he mouth. Digestion begins even before the food enters the mouth.
through digestion large food particles are converted into smaller components that can be readily absorbed into the bloodstream surcrase binds to the active site of sucrase and the put stress on the bond between the two sugars that make up sucrase the bond breaks releasing glucose and fructose
Explain how lone pairs of electrons influence the shape of a molecule.
Explanation:
the lone pairs will be negatively charged. these have a repulsion effect on other negatively charged electrons in the shells of atoms. picture a water molecule: the lone electron pair on the top of the oxygen will have a repulsion force on the 2 hydrogen atom's orbiting electrons to cause a bent molecular geometry.
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
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
What kind of daughter cells result from meiosis, genetically identical or different from parent cell?
Answer:
Which of the following would be an example of Beta decay?
Answer:
si- 26 > Mg22
Explanation:
it is less than what you started with.
3. A solution that can hold more solute is called
Answer:
A solution that can hold more solute is called. saturated.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.
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
Atoms of which pair of elements will form covalent bonds in a compound?
O A. Li and Br
O B. P and CI
O c. Ti and o
D. Ti and Ni
Answer:
B. P and Cl
Explanation:
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%
does something that is hot have more thermal energy than something that’s cold?
Answer:
Yes it does because the atoms/molecules are moving faster than they are in a cold substance.
Explanation:
Which statement is true of a food web?
A. Producers have the greatest amount of available energy.
B. Decomposers have the greatest amount of available energy.
C. Primary consumers have the greatest amount of available energy.
D. Secondary consumers have the greatest amount of available energy.
Answer:
A= producers have the greatest amount of available energy
During the nineteenth century, biologists knew that South America and Africa contained similar fossils. These fossils led them to believe that a temporary land bridge between South America and Africa allowed
ancient species to move between both continents. In the twentieth century, evidence showed that South America and Africa were once part of the same larger continent and that there were no land bridges
between them. How should biologists respond to the new geological finding?
A) Biologists should reject the geological finding, because it is new.
B) Biologists should ask physicists what to do, because physics is a more exact science.
C) Biologists should reject the belief in ancient species, because there were no land bridges.
D) Biologists should update the history of life, because it should include the new geological finding.
Answer:
c
Explanation: yes
The biologists respond to the new geological finding reject the belief in ancient species, because there were no land bridges. Therefore, option C is correct.
What are fossils ?The term fossils are defined as the remains or traces of ancient life that have been preserved by natural processes. The examples of fossils are microbes, exoskeletons, objects preserved in amber, petrified wood, coal, hair, oil, and DNA remnants.
Fossils are formed in several ways, but mostly they are formed when a living organism such as a plant or animal are dies and is quickly buried by in mud, sand or volcanic ash.
The biologists respond to the new geological finding reject the belief in ancient species, because there were no land bridges.
Thus, option C is correct.
To learn more about the fossils, follow the link;
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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:
A solution is prepared by dissolving 25.1 g urea, (NH2)2CO, in 170.9 g water. Calculate the boiling point of the solution. Urea is a nonelectrolyte.
Answer:
101.260 ° C
Explanation:
From the given information;
The molarity of lactose solution (m) can be calculated as:
[tex]m = \dfrac{25.1 \times \dfrac{1 \ mol \ (NH_2)_2 \ CO}{60.01 g} }{0.170 \ kg }[/tex]
m = 2.46 m
The molar elevation constant of water [tex]k_b = 0.512 ^0 \ C/m[/tex]
Using the elevation in boiling point ;
i.e.
[tex]\Delta T_b = k_b \times m[/tex]
[tex]\Delta T_b = 0.512 \ ^0C/m \times 2.46 \ m[/tex]
[tex]\Delta T_b = 1.260 \ ^0C[/tex]
The boiling point of water solvent;
[tex]T_{water \ solvent} = 100^0 C[/tex]
Elevation in boiling point;
[tex]T_b = T_{solution} - T_{water \ solvent}[/tex]
[tex]T_{solution} = T_b+ T_{water \ solvent}[/tex]
[tex]T_{solution} = 1.260 \ ^0 C + 100 ^ 0 \ C[/tex]
[tex]T_{solution} = 101.260 \ ^0 C[/tex]
Oh my god sadddddddddddddddddd
Answer:
sad? that your giving out free points?
Explanation:
Answer:
what wrong
tell i can help u
Explanation:
Which generates waves that are capable of traveling through a vacuum?
a light bulb
O a speaker
earthquake activity
volcanic eruption
Answer:
Light bulbs
Explanation:
light waves are electromagnetic waves which can travel through a vacuum
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 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:
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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
What determines the severity of the storm?
Answer:
A thunderstorm is classified as “severe” when it contains one or more of the following: hail one inch or greater, winds gusting in excess of 50 knots (57.5 mph), or a tornado. ... There are about 100,000 thunderstorms each year in the U.S. alone. About 10% of these reach severe levels
Explanation:
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.
