Answer:
C = 75%
Explanation:
Theoretical yield = 8.17g
Actual yield = 6.13g
To calculate the percentage yield of a compound in a reaction, we'll use the formula to calculate it
Percentage yield = (actual yield / theoretical yield) * 100
% yield = (6.13/8.17) * 100
Percentage yield = 0.7503 * 100
Percentage yield = 75.03%
Explain the effects that different frequencies of electromagnetic radiation have when absorbed by matter.
As the frequency of the radiation increases further, into the visible light spectrum, it can cause electronic transitions in atoms and molecules, leading to the emission of light and other optical effects.
What is electromagnetic radiation?Electromagnetic radiation is a form of energy that travels through space in the form of waves, without the need for a medium to propagate. It is characterized by oscillating electric and magnetic fields that are perpendicular to each other and the direction of propagation.
At low frequencies, such as radio waves and microwaves, the radiation typically only causes heating of the matter, as it transfers energy to the molecules in the material.
At higher frequencies, such as infrared radiation, the radiation can cause vibrations in the atoms and molecules of matter, leading to heating and thermal effects.
Thus, When matter absorbs electromagnetic radiation, the effects that it has on the matter depend on the frequency of the radiation.
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How do I solve this? Please help.
How much heat is required to raise the temperature of 179g of acetic acid, CH3COOH, from 250C to 82.70C?
Answer: The heat required to raise the temperature of 179 g of acetic acid, is 21000 Joules
Explanation:
The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.
[tex]Q=m\times c\times \Delta T[/tex]
Q = Heat absorbed = ?
m = mass of acetic acid = 179 g
c = heat capacity of acetic acid = [tex]2.043J/g^0C[/tex]
Initial temperature = [tex]T_i[/tex] = [tex]25^0C[/tex]
Final temperature = [tex]T_f[/tex] = [tex]82.7^0C[/tex]
Change in temperature ,[tex]\Delta T=T_f-T_i=(82.7-25)^0C=57.7^0C[/tex]
Putting in the values, we get:
[tex]Q=179g\times 2.043J/g^0C\times 57.7^0C=21100J[/tex]
Thus heat required to raise the temperature of 179 g of acetic acid, is 21000 Joules
Dr. Michelle Wang at Cornell University studies DNA replication and protein synthesis. Her group researches how a protein called helicase unzips the DNA strand.
After DNA is unzipped, what is the next step in DNA replication?
A. Messenger RNA forms along the exposed DNA bases.
B. A chromosome with two identical strands of DNA is formed.
C. Nitrogen bases pair up with the DNA strands.
D. Ribosomes attach to DNA and move along the strand.
Answer:
C. Nitrogen bases pair up with the DNA strands.
Explanation:
The correct option would be that nitrogen bases pair up with DNA strands.
DNA replication is a process during which a DNA molecule makes a copy of itself. It represents one of the major processes of gene expression.
DNA replication happens in several steps and it involves several important enzymes: The steps can be summarized in chronological order as follows:
The double helix structure of the DNA is first unwound using a helicase enzyme.A short RNA sequence known as primer binds to each DNA strand. Binding is done at a single site on the leading strand while it is done at multiple sites on the lagging strand.An enzyme known as DNA polymerase then elongates the primers by adding nucleotide bases to grow new strands.Once elongation is complete, the primer disengage and the RNA nucleotide bases are replaced DNA equivalence, the okazaki fragments of the lagging strands is joined by a ligase, the nely synthesized strands are proofread and each strand winds up to their respective parent strand.Hence, the correct option would be that nitrogen bases pair up with the DNA strand.
Correct option: C.
How is the atmospheric oxygen that is taken in by living things for respiration replaced?
A) After living things use oxygen for respiration, they exhale the oxygen back to the atmosphere.
B) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
C) Weathering releases oxygen that is locked in rocks due to sedimentation.
D) Oxygen that is dissolved in water such as oceans is released.
Answer:
B.) Photosynthesis uses the carbon dioxide that is exhaled by living things to make oxygen.
Explanation:
The map shows the main streams and the the rivers near City A and City B, as well as the nearby factories and farmland, The arrows in
the diagram show the direction of the water flow. City A gets its water from the sunset River and City B gets its water from the Moth Lake. A liquid herbicide was applied to a farmland. What is the greatest risk of using the herbicide?
Select One:
It will pollute the water source for the city A
It will pollute the air for the City B
It will pollute the water source of city B
It will pollute the air for the city A
Answer:
c
Explanation:
the map shows water near the factories go into moth lake so all of the waist will end up there
Does anyone know how to solve this
Answer:
Beta
Explanation:
Beta has signal 0 above and -1 under
Sulfuric acid (H2SO4) has a molar mass of 98.1 g/mol. How many oxygen atoms are found in 75.0 g of H2SO4? A. 1.15 × 10^23 B. 1.84 × 10^24 C. 4.61 × 10^23 D. 7.87 × 10^23
Answer:
B
Explanation:
first find the no. Of moles of H2SO4
= 75/98.1
= 0.7645
Next step
In on mole of H2SO4 the no.of oxygen atom is 4.
1 H2SO4 : 4 O
0.7645 : x x= 0.7645x4= 3.0581
next multiply avogadros constant
3.0581 x 6.022× 10^23 =1.84x10^24
Mass present in 1 gram of mole substance is called molar mass. Molar mass is calculated by: dividing the mass of the compound in grams by the number of moles present in the substances.
The correct answer is:
option B. 1.84 × 10²⁴
Given,
The mass of sulfuric acid =75.0 gThe molar mass of sulfuric acid = 98.1 g/mol
1.The moles of sulfuric acid can be calculated by
M = m ÷ n
where M is molar mass, m is mass and n moles.
moles of sulfuric acid = mass ÷ molar mass
= 75 g ÷ 98.1 g/mol
=0.7645 moles
Hence moles of sulfuric acid present is 0.7645 moles.
2. 1 mole of sulfuric acid = 4 oxygen atoms.
Then, 0.7645 moles of sulfuric will contain: 0.7645 × 4 = 3.0581 atoms of oxygen
3. Oxygen atoms present in 75.0 g of H₂SO₄ will be calculated by multiplying it with Avogadro's constant:
= 3.0581 x 6.022× 10²³
= 1.84x10²⁴
Therefore, 1.84 × 10²⁴ oxygen atoms will be found in 75.0 g of H₂SO₄.
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(Multiple Choice, 30 pts)
A student wants to determine whether an unknown solid is an ionic compound. He puts some in water and finds that it does not dissolve. He says that this proves the solid is ionic. Which best evaluates the student's reasoning?
A. He is incorrect, because water can dissolve ionic solids.
B. The test proves nothing, because water dissolves all solids.
C. He is correct, because polar liquids cannot dissolve ionic solids.
D. The test proves nothing, because it only shows that the solid is a compound.
(I know water is polar, so I think its a?)
The student cannot prove that if the compound is ionic or covalent because not all ionic compounds dissolves in water. Some ionic compounds have higher lattice energy results in lower solubility. Thus, option D could be correct.
What are ionic compounds?Ionic compounds are formed between metals and non metals. Metals are electron rich and they easily donate electrons to the non-metals. Non-metals are generally electronegative and they easily gains electrons from the metals.
Donating electrons make metals acquire positive charge and the non-metals acquire a negative charge. This charge separation make the compound possess a permanent dipole moment. Which make them easily soluble in water by ion-dipole interaction.
However, some ionic compounds have very strong ionic bonds and their binding energy will be greater so that cannot be easily dissolved in water. For example, AgCl. Therefore, we cannot predict weather the compound is ionic or not by simply noting it solubility in water.
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Cuando se queman combustibles que tienen algún compuesto de azufre se produce dióxido de azufre (SO2), un gas irritante que puede provocar lluvia ácida. En el análisis del aire de una ciudad se ha encontrado una concentración de SO2 de 14 mg/m^3 ¿Qué cantidad de SO2 habrá en 1 L de aire?
Answer:
See answer below
Explanation:
I have to answer this question in english because is the rule here. I hope you can understand this.
Now, in order to answer this, is really easy. We already have the quantity of SO₂ in the air of a city. This concentration is 14 mg/m³, so we want to know the quantity in 1 L. This quantity can be expressed in mass.
If concentration according to the units is: mg/m³ This means that we have units of mass and volume. So, in order to know the quantity of SO₂ in mass, we need to convert the units of volume m³ to liter.
1 m³ is covered in 1000 L, therefore:
14 mg/m³ * 1 m³/1000 L = 0.014 mg/L
Then, the mass will be:
m = 0.014 mg/L * 1 L
m = 0.014 mg of SO₂
This is the quantity of SO₂ in 1 L.
During light-dependent reactions, carbon dioxide is converted to glucose.
Group of answer choices
True
False
Answer:The light-independent reactions use the ATP and NADPH from the light-dependent reactions to reduce carbon dioxide and convert the energy to the chemical bond energy in carbohydrates such as glucose.
Explanation:step-by-step
Answer:
FALSE
Explanation:
I just took the test and put true and it was wrong so it's false. Hope this helps and please mark brainliest!
Question 2 options: The Galápagos tortoises are native to seven of the Galápagos Islands, a volcanic archipelago about 620 miles west of the Ecuadorian mainland. With lifespans in the wild of over ____________years, it is one of the longest-lived vertebrates. A captive individual lived at least ______________years!
Answers:
in the wild of over 100 years,...
A captive individual lived at least 255 years!
Explanation:
The giant Galapagos tortoises (Chelonoidis nigra) are famous because this species was observed by Darwin during his travel. This species is native from the Galapagos Islands and currently is in danger of extinction. Galapagos tortoises are recognized as one of the longest vertebrates. In this regard, it is worthy to note that a giant tortoise named Harriet lived 255 years, this specimen was in the Australian Zoo.
in a titration 20.0 mL of 0.150 M NaOH(aq) Solution exactly neutralize is 24.0 mL of an HCl solution what is the concentration of the HCl solution
Answer:
0.125
Explanation:
i took a test and got it right choosing this answer hopes this help
Which of the following is stored in the skeletal system?
A. potassium
B. calcium
phosphorous
D. sodium
Answer:
b calcium
Explanation:
How are renewable fuels different from fossil fuels
Answer:
Renewable energy
Explanation:
on the other hand, typically emits less CO2 than fossil fuels. In fact, renewables like solar and wind power—apart from construction and maintenance—don't emit any CO2 at all. With renewable energy, you can breathe easier, stay cooler, and create a more comfortable world for generations to come.
Answer:
renewable energy comes from natural resources that can be replenished or replaced during an average human lifetime ; eg, Hydro, solar, wind etc.
fossil fuels can take thousands or even millions of years to naturally replenish; eg, natural gas, coal, oil.
Which has the highest rate of effusion oxygen or hydrogen
Answer:
Hydrogen has the highest rate of effusion
A neutralization reaction has what two reactants?
A — acid and base
B —- hydrocarbon and water
C— acid and salt
D—hydrocarbon and base
Answer:
it's a, acid and base
Explanation:
a neutralization reaction occurs between strong acids and strong bases and result in the formation of a salt and water
How many moles of NaCl are contained in 100.0ml of a 0.20m solution
what is the compound of libr
Answer:
Lithium Bromide
Explanation:
Answer:
El bromuro de litio es un compuesto químico de litio y bromo. Su carácter higroscópico extremo hace que LiBr sea útil como desecante en ciertos sistemas de aire acondicionado.
Explanation:
HELP CHEM ASAP!!!!!!
Answer:
0.132
Explanation:
is the only part i know
Select the single best answer.
Predict the pH (> 7, < 7, or = 7) of a LiHCO3 solution.
Answer:
LiHCO3 its PH >7
Explanation:
the real ph for it is 11.3 so it makes it more than 7
and if you know it is a conjugate base coming from the weak acid H2CO3 so LiHCO3 is a base
Which phrase provides the best definition of mass movement?
the movement of material caused by erosion
the slow flow of a glacier as it moves through the valley of a mountain
the movement of large amounts of soil and rock debris down a slope
the fast movement of a boulder rolling down a slope
Answer:
the movement of large amounts of soil and rock debris down a slope
Explanation:
yeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeetyeet
What’s the two products of H2Co3
Answer:
Hydrogen and Cobalt
Explanation:
Break up each individual element
- Hope that helps! Please let me know if you need further explanation.
help me name these molecules please
Answer:
1. carboxylic acid
2. ether
3. ester
4. aldehyde
5. ketone
6. amine
7. alcohol
Explanation:
Know the functional groups. If you would like to learn them, let me know.
- Hope that helps! Please let me know if you need further explanation.
Temperature and volume are
_____ related, which means as temperature______
the volume decreases.
Answer:
They are directly related.
Temp decrease then volume decrease
Temp increase then volume increase
What volume of 0.125 M HCl is needed to titrate 50.0 mL of 0.0500 M NH3 solution ?
Answer:
20
Explanation:
Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
Answer:
sunlight
Explanation:
what is the mass of 7.525 x10^24 particles of sulfur difluoride SF2?
Answer:
Mass will be equal to 874.56 gram
Explanation:
Molar mass of sulfur = 32 u
Molar mass of Florine = 19 u
Therefore molar mass of [tex]SF_2[/tex] [tex]=32+2\times 19=70u[/tex]
So mass of [tex]6.023\times 10^{23}[/tex] particle is 70 gram
Therefore mass of 1 particle
[tex]=\frac{70}{6.023\times 10^{23}}=11.62\times 10^{-23}g[/tex]
Therefore mass of [tex]7.525\times 10^{24}[/tex] particle is
[tex]7.525\times 10^{24}\times 11.62\times 10^{-23}=874.56gram[/tex]
What causes metamorphic rocks to form from cristing rocks?
A.magma and minerals
B.heat and pressure
C.exposure to Earth's mantie
D.exposure to Earth's surface
Answer:
B.heat and pressure
Explanation:
Answer:
The answer is B.
Explanation:
Metamorphic rocks are formed due to heat and pressure, that is acting on it .
Ca(OH)2
Name this compound according to IUPAC nomenclature.
A) calcium hydroxide
B) calcum oxide hydride
C) calcium (II) hydroxide
D) calcium (II) oxide hydride
I’ll give Brainliest to the first answer
The amount of elements on the reactants side of an isolated equation are ___________ the amount of __________ that are formed on the ________ side. *
A)close to, ice crystals, cold
B)less than, properties, chemical
C)equal to, elements, products
D)similar, molecules, present
E)more than, elements, products
Answer:
C. equal to, elements, products
Explanation:
I took a quiz and it said this was right
