Answer:
This repulsion is stronger than the repulsion between the lone pair and the three bond pairs on the nitrogen atom. Since the repulsions on the bond pairs in H2O molecule are greater than that in NH3 the bond angle in water is less than that of ammonia.
After a radioactive atom decays, it is the same element that it was before with no measurable change in mass. Which kind of decay has occurred, and how do you know?.
Gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.
What happens in gamma decay?In gamma decay, the number of protons and neutrons in the nucleus does not change, so the product of decay remain the same element..
Note that mass number is equal to the sum of the protons and neutrons and so if there is no change, the mass of the element remains the same.
Thus, gamma decay is a radioactive decay in which there is no measurable change in mass and the element remains the same.
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125 grams of HCl are used. Zn(s) + 2HCl(aq) = ZnCl2(aq) + H2(g). What is the percent yield if 1.2 moles of hydrogen are actually produced?
Answer:
70%
Explanation:
To find the percent yield, you need to (1) convert grams HCl to moles (via molar mass from periodic table), then (2) convert moles HCl to moles H₂ (via mole-to-mole ratio from equation), then (3) calculate the percent yield H₂ (via percent yield equation).
Zn (s) + 2 HCl (aq) --> ZnCl₂ (aq) + 1 H₂ (g)
Molar Mass (HCl): 1.008 g/mole + 35.45 g/mole
Molar Mass (HCl) = 36.458 g/mole
125 g HCl 1 mole HCl 1 mole H₂
--------------- x ------------------ x ------------------ = 1.7 moles H₂
36.458 g 2 moles HCl
(actual yield / theoretical yield) x 100% = percent yield
theoretical/calculated yield = 1.7 moles H₂
actual yield = 1.2 moles H₂
(1.2 moles H₂ / 1.7 moles H₂) x 100% = 71%
Therefore, the best percent yield of hydrogen produced is 70%.
We are now finished learning about the various units in forensics. Using what we have learned in class all year and this week’s episode of forensic files, which branches of forensics are most important when solving a criminal justice case? Use and underline at least 3 vocab words that we used in this unit.
Pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.
What are forensics sciences?Forensic sciences refer to the scientific fields aimed at solving justice cases such as DNA sample forensics.
Other fields in forensics science include:
forensic botanyforensic archeologyforensic physicsIn conclusion, pathology is the main branch of forensics in order to solve a criminal justice case, although other branches may also be important.
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11) A sample of 131I decays to 1.0 gram in 40 days. What was the mass of the original sample? [half-life = 8.07 days]
A) 32 g
C) 16 g
D) 8.0 g
B)4.0 g
Given the remaining quantity after the given time and the half-life, the initial quantity or original mass of the sample is 32g.
Option A) is the correct answer.
What was the mass of the original sample?Half-life is simply the amount of time it takes a given quantity to decrease to half of its initial value.
Using the expression:
[tex]N_{(t)} = N_{0}\frac{1}{2}^{\frac{t}{t_{\frac{1}{2} }} }[/tex]
Given the data in the question;
Remaining quantity Nt = 1.0gtime t = 40 daysHalf life t(1/2) = 8.07 days[tex]N_{(t)} = N_{0}\frac{1}{2}^{\frac{t}{t_{\frac{1}{2} }} }[/tex]
[tex]1.0g = N_{0} * (0.5)^{40days/8.07days}\\\\1.0g = N_{0} * (0.5)^{4.95662949}\\\\1.0g = N_{0} * 0.0322037055\\\\N_{0} = \frac{1.0g}{0.0322037055} \\\\N_{0} = 31.05g = 32g[/tex]
Therefore, given the remaining quantity after the given time and the half-life, the initial quantity or original mass of the sample is 32g.
Option A) is the correct answer.
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Which of these actions would increase heat transfer between two objects?
&
establishing their thermal equilibrium
increasing the area of their contact
using objects with similar specific heats
• reducing the time of their contact
Heat transfer is the phenomenon that occurs when the two objects are in the vicinity of each other and by increasing the area of their contact. Thus, option B is correct.
What is heat transfer?Heat transfer is a process that flows the heat from one system to another, and is because of the difference in the temperature of the two objects that are part of the system.
The methods like conduction, convection, and radiation transfer the heat from the surface area to the other object. The heat gets transferred from the area of high to the low temperature.
Therefore, option B. by increasing the surface area the heat transfer increases.
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In the chemical equation 4Fe + 3O2 → 2Fe2O3, 20.99 grams of iron (Fe) are needed to produce 30.01 g of Fe2O3.
True or False?
In which condition does barium chloride conduct electricity? And why
Answer:
When barium chloride (BaCl 2) is dissolved in water, the water conducts electricity. In what form will the dissolved BaCl 2 be found? a. as Ba 2+ and Cl - ions b. as Ba atoms and Cl 2 molecules
Explanation:
Why are no flying dinosaur fossils found in rocks that are younger than those
formed during the Mesozoic era?
The flying dinosaurs becoming extinct was the reason they were not found in rocks that are younger than those formed during the Mesozoic era.
What is a Fossil?This is defined as preserved remains of plants and animals found on earth crust.
The flying dinosaurs became extinct which was why the fossils found during the Mesozoic era were not younger and makes option C correct.
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What is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4oC?
Please show the work <3
Answer:
2.68 Liters
Explanation:
ideal gas law
PV=NRT
to get the volume
rearrange the formula
V=nRT/P
R molar gas constant is in units joules per mole kelvin :
8.314 J/(mol K) (joules per mole kelvin)
T temperature part of this is in kelvin so you have to convert the Celsius temperature to kelvin
1 Celsius is 274.15 kelvin so
83.4 Celsius is 356.55 kelvin
P pressure is in Pascal or Pa units
so you have to convert atm into Pa
1 atm is 201636.8 Pa or Pascals so
1.99 atm is 201636.8 Pa
V volume will be in cubic meters or m^3
m^3 will need to changed to liters
1 cubic meter or m^3 is 1000 liters
n amount of substance is in moles
again the rearranged formula is
V=nRT/P
(0.182*8.314*356.55)/201636.8 =
0.00267566693 cubic meters or m^3
1 cubic meter or m^3 is 1000 liters so
0.00267566693 cubic meters or m^3 times 1000 =
2.67566693 liters
list 10 ways a small community can conserve energy and recourses??
An oil has a density of .78g/ml and a mass of 3.6kg. what is the volume of the oil?
Answer:
v = 4.62 L
Explanation:
Necessary Conversion:
1000 g = 1 kg
Density of Oil in kg/mL:
0.78g/ml * (1 kg/1000 mL) = 0.00078 kg/mL
Density Equation (Heart with an arrow through it):
d = m/v
Rewrite to Find Volume (Multiply Both Sides by v/d):
v = m/d
Substitue m and d to Find v:
v = (3.6 kg)/(0.00078 kg/mL)
v = 4615.38 mL
Convert to More Suitable Units (Liters) by Dividing by 1000:
v = 4.62 L
:D
39. suppose an aqueous solution contains both table sugar and table salt. can you separate either of these solutes from the water by filtration? explain your reasoning.
Answer:
No, assuming that the salt/sugar is already dissolved
Explanation:
As long as the particle size is too big, it won't filter through. Therefore, if it is dissolved, it will pass through the filter.
If you were to throw rocks in there or something, and they are non-dissolvable, then yes.
Calculate the ionization constant of each reaction. hcl (aq) + h2o (l) equation h3o+ (aq) + cl- (aq); [hcl] = 16.9m, [h3o+] = 13.3m, [cl-] = 7.4mka =
The ionization constant from the reaction as shown in the calculation is 5.8.
What is the ionization constant?The term ionization constant refers to the extent to which the acid is ionized in solution. It is calculated from;
Ka = [H3O^+] [Cl]/[HCl]
Thus when we substitute the values;
Ka = 13.3 * 7.4/ 16.9
Ka = 5.8
The ionization constant from the reaction as shown in the calculation is 5.8.
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Different isotopes of the same element emit light at slightly different wavelengths. A wavelength in the emission spectrum of a hydrogen atom is 656.45 nm; for deute- rium, the corresponding wavelength is 656.27 nm. (a) What minimum number of slits is required to resolve these two wavelengths in second order
Different isotopes of the same element emit light at slightly different wavelengths, the minimum number of slits is mathematically given as
N=1820slits
What minimum number of slits is required to resolve these two wavelengths in second-order?Generally, the equation for the wave is mathematically given as
[tex]d\ sin\ (\theta\ m) \ = \ m\ \lambda[/tex]
Where the chromatic resolving power (R) is defined by
[tex]R\ =\ \lambda\ / \ d \ \lambda[/tex]
R = nN,
Therefore
[tex]\lambda_1 \ = \ (656.45)(1 \ * \ 10^{-9})/1mm[/tex]
[tex]\lambda_1= 656.45*10^{-9}[/tex]
and
[tex]\lambda_2= (656.27)(1*10^{-9})/1mm[/tex]
[tex]\\\\\lambda_2= 656.27*10^{-9}m[/tex]
In conclusion, the minimum number of slits is required to resolve these two wavelengths in second-order
[tex]N\ =\ \dfrac{\lambda}{m\ d\ T\ }\\\\[/tex]
Therefore
[tex]N\ =\ \dfrac{656.45 \ * \ 10^{-9}}{2\ * \ (0.18*10^{-9})}[/tex]
N=1820slits
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Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system
Energy enters into the ecosystem via sunlight and leaves as heat from metabolism.
What is energy?The term energy refers to the ability to do work. Energy enters the ecosystem from the sun and is transformed into chemical energy in food which is now passed along the food chain.
Animals eat plants and part of this energy is used for metabolic activities which releases some of this energy as heat energy.
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define an arrhenius acid and describe the properties of acids. use an example to explain how an arrhenius acid will behave when dissolved in water.
An Arrhenius acid is a substance that dissociates in water to form hydrogen ions or protons.
What is an Arrhenius acid?An Arrhenius acid increases the number of[tex]H^+[/tex] ions in the water.
According to the Arrhenius theory, a substance which has hydrogen atom and can easily give hydrogen ion or proton in its aqueous solution is called as Arrhenius acid.
For example, when hydrochloric acid is dissolved in water, it forms chloride ion ([tex]Cl^-[/tex]) and hydronium ion ([tex]H_3O^+[/tex]).
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Compare the temperature change for cold sand and cold water when the same amount of hot water was added. what do you discover?
When the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
What is specific heat capacity?Specific heat capacity is the quantity of heat required to raise a unit mass of a substance by 1 kelvin.
Specific heat capacity of water and sandWater, c = 4,200 J/kg⁰C
Sand, c = 830 J/kg⁰C
Q = mcΔθ
where;
Δθ is temperature changeQ is quantity of heat addedΔθ = Q/mc
Thus, for an equal mass of water and sand, when the same amount of heat is added to cold sand and cold water, the temperature change of sand will be higher because of its lower specific heat capacity.
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Answer:t
Explanation:
What are the products when (nh4)2s is added to a solution that contains al3+?
The product of the reaction is given by the changes in the chemical and physical properties of the reactants. The product produced is aluminum sulfide precipitate.
What is a precipitate?A precipitate is an insoluble complex formed when the solute and the solvent reacts to produce and solid complex material that does not get completely dissolved in the solution.
When ammonium sulfide is added to a solution containing aluminum ions then precipitate of aluminum sulfide is formed as:
3(NH₄)₂S + 2Al³⁺ → Al₂S₃ + 3NH₄⁺
Therefore, aluminum sulfide is the precipitate that gets formed.
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When the same quantity of electricity was passed through a dilute solution of sodium hydroxide and through a molten solution of lead bromide, 0.050 mol of lead was produced. what amount (in mol) of hydrogen gas was evolved
0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.
What amount in moles of hydrogen will be produced?The amount in moles of hydrogen produced when the same quantity of electricity is passed through different electrolytes is inversely proportional to the charge on the ions.
The charge on the Lead ion is +2.
The charge on the hydrogen ion is +1.
2 atoms of hydrogen gives one molecule of hydrogen gas.
Hence, equal charge liberates equal amounts in moles of lead and hydrogen gas.
Therefore, 0.050 moles of hydrogen gas are liberated when a given quantity of charge liberates 0.050 moles of lead.
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Assuming a parent isotope with a half-life equal to 4.5 billion years, what percentage
of the original parent remians after 6.75 billion years have passed?
Answer:
35.4 % left
Explanation:
6.75 / 4.5 = 1.5 half lives
1/2 ^(1.5) = .354 or 35 .4 %
using are organic compounds made by living things
Answer:
The chemical compounds of living things are known as organic compound because of their association with organisms and because they are carbon-containing compounds, which are the compounds associated with life processes, are the subject matter of organic chemistry
Types of Temperature ?
Answer:
Is Fahrenheit and Celsius the answers you are looking for?
Explanation:
I hope this could help you! :)
Answer:
Types of Temperature ?Temperature Scales. There are three temperature scales in use today
Fahrenheit, Celsius and Kelvin.Explanation:
Always remember:beluga always love answer your question by following these steps:Follow belugaask meBrainliest me first oktake note please: everyone i answer question I got happy:)please don't delete Your question beacause Brainliest Marks & pointswill be loseMatter can undergo chemical reactions and nuclear reactions. Which statement is true only for nuclear reactions?
A - The mass of reactants is conserved
B - The energy of reactants is conserved
C - The atoms are reorganized into products.
D - The nuclei of the atoms.
Answer:
B - The energy of reactants is conserved.
D - the nuclei of atoms changes completely ( if that's the option)
Hi i will give brainliest to whoever answers this, thank you
Let's see
C1V1=C2V235(0.128)=0.415V24.48=0.415V2V2=10.79mLV2=0.01079Lis calcium hydroxide a strong alkali? if no, why? if yes, why? i really don’t understand
Answer:
Yes
Explanation:
Neither Calcium nor hydrogen nor oxygen are alkali metals
Alkali metals are Group 1 elementsThey are very soft and mellable.H,Li,Na,K,Cs,Fr are included in it however H is not a actual memberHere
Ca(OH)_2 is the compound
Vant Hoff factor is 3
As it's greater than 1 it's a very strong base .
The pOH of this comes around 1.5 to 1.3
So very heavy ionic dissociation
Strong Alkali
Calcium hydroxide [tex] \sf \: Ca(OH)_2[/tex] is a really strong alkali or base since it has the power to accept proton when added to a solution.. Its pH is 9 and we know that when the pH is more than 7 it is a base..
One more reason why calcium hydroxide is a strong alkali is that it dissociates completely when added to any solution...
the diagram shows a model of a water cycle which word best summarizes the process labeled x in the model? A. Commensalism B.Photosynthesis C. precipitation D. Evaporation
Answer:
D evaportaion. it shows the sun evaporating the lake.
Which refers specifically to a heated solution that holds more dissolved solution than it can hold at a lower temperature?.
Answer:
Supersaturated solution
Explanation:
Weren't there any options?
Anyways, the best I can think of right now is a supersaturated solution.
Is industry pool or flux
Answer:
What is the difference between pools and fluxes?
Image result for Is industry pool or flux
Fluxes describe the movement of energy and matter between different pools. When you pour a glass of juice for yourself, the juice bottle and the glass are both “pools” for the apple juice. The act of pouring it from the bottle to the glass is the flux
Explanation:
question -What happens to the energy of a wave if the amplitude of the wave is doubled?
The energy carried by the waves depends on the amplitude of the wave. If the amplitude is doubled then the energy gets increased by four times.
What is amplitude?The amplitude of a wave is the distance from the center line to the trough or the crest of the wave. The energy of the wave is directly proportional to the square of the amplitude.
E ∝ A²
So if the amplitude is doubled then E = 4. Hence, the energy gets increased quadruples times. The energy is related to the frequency and the wavelength of the wave that travels.
Therefore, the energy gets increased by four times if the amplitude is doubled.
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How many atoms are in 3.5 mol he?
Answer:
2.11×10^24
Explanation:
You times the Avogadro number by 3.5
6.023 times 10^23.
then times it by 3.5.
I got 2.11 times 10 ^24.
I hope this helps. Have a lovely day.