Answer:
Far as I know coefficients are unitless. sorry if this don't help ;)
Which type of metal ions tends to absorb light in the visible range?
Transition metal ions tends to absorb light in the visible range.
What are Transition Metals?Transition metal is defined as an element having a d subshell that is partially filled with electrons, or an element that has the ability to form stable cations with an incompletely filled d orbital.
The transition metals are located towards the middle of the periodic table between the highly reactive metals and the noble gases.
They are the only elements that may use electrons in the next to highest—as well as the highest—energy level as valence electrons.
Transition metals are unusual in having very similar properties even with different numbers of valence electrons.
Therefore, Transition metal ions tends to absorb light in the visible range.
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Consider pure water separated from an aqueous sugar solution by a semipermeable membrane, which allows water to pass freely but not sugar. After some time has passed, the concentration of sugar solution: a. will have decreased b. will be the same on both sides of the membrane c. might have increased or decreased depending on other factors d. will not have changed e. will have increased
Answer:
it will be the same on both sides of the membrane
When the pure water is separated from the aqueous sugar solution when the sugar cannot pass through the semipermeable membrane. So the water moves through the membrane to the sugar solution. Therefore, the concentration of sugar solution will be decreased.
What is osmosis?Osmosis can be described as the spontaneous net movement or diffusion of solvent molecules through a permeable membrane from a region of lower solute concentration to a higher solute concentration in a direction that tends to balance the solute concentrations on both sides.
A physical process in which any solvent moves across a selectively permeable membrane separating two solutions of different concentrations.
Osmotic pressure can be described as the external pressure needed to be applied so that there is no net movement of a solvent across the membrane. Osmotic pressure can be defined as a colligative property because it depends on the molar concentration of the solute but not on its identity.
Therefore, option (A) is correct.
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PLEASE HELP WILL MARK BRAINLEST!!!!
Answer: c????????
Explanation:
Terry, a student, performs a titration. He completes these steps as part of his titration procedure: 1. He cleans and rinses a burette with standardized base. 2. He fills the burette with standardized base solution. 3. He reads and records the initial burette volume. 4. He adds a base from the burette to an acid. 5. He observes a color change in the Erlenmeyer flask. 6. He stops the addition of base from the burette. 7. He reads and records the final burette volume. Which steps will provide information needed to calculate the volume of base needed to reach the equivalence point? A. 1 and 6 B. 3 and 7 C. 3, 4, and 6 D. 1, 2, and 7
Answer:
D
Explanation:
D is the answer because 2 is needed to know
Answer:
B) 3 and 7
Explanation:
i just took the test
Which of the following statements about energy is FALSE?
A. Energy can be converted from one type to another.
B. The total energy of a system remains constant.
C. Energy is the capacity to do work.
D. Kinetic energy is the energy associated with its position or composition
E. Systems tend to change in order to lower their potential energy
According to law of conservation of energy, the statement which is false is kinetic energy is the energy associated with its position or composition.
According to law of conservation of energy, it is evident that energy is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
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The mass of an atom of element x is equivalent to the total mass of 7 hydrogen atoms
Answer: I'm not sure what your question is but i'll answer as best as I can.
Explanation:
Since X is equal to 7 H and we know that H is equal to 1.008, we can just do 7x1.008 = 7.056 g. I hope i helped and please clarify more in the future.
The atomic mass of an element is given by the sum of the mass of protons and neutrons. The element X is lithium as it has a mass of 6.941 u.
What is atomic mass?Atomic mass is the sum of the masses of the isotopes of that element and is given by adding the masses of the number of protons and neutrons of the elemental atom.
The atomic mass of one hydrogen atom is 1.008, so seven hydrogens will be, 7 x 1.008 = 7.056 g. Now, from the periodic table, it can be seen that an atomic mass of 7.056 g is closest to the atomic mass of a lithium atom (6.941 u).
From the mass, it can be said that seven hydrogen atom has an equivalent mass as that of one lithium atom in the periodic table. The lithium atom has atomic number 3 and an atomic mass of 6.941 g/mol.
Therefore, element X is lithium.
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Write the overall balanced equation for the reaction:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
Answer:
This reaction has infinite ways to be balanced
Explanation:
To balance this equation we can use the algebraic method:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
Where we write each molecule as a letter:
A + B → C + D + E
Then, we write the equations according the number of atoms of each molecule. That is:
Oxygen → 4A + B = C + 2D + 2E (1)
Nitrogen → 2A = C + E (2)
Carbon → B = D (3)
Then, we have to give 1 arbitral number for a letter. For example:
B = 1; D = 1
(1) 4A + 1 = C + 2 + 2E
4A = C + 2E + 1
2A = C + E (2) Twice (2):
4A = 2C + 2E
Subtracting (1) in (2)
C + 2E + 1 = 2C + 2E
C + 1 = 2C
1 = C
Si 1 = C:
4A + 1 = 1 + 2 + 2E
4A = 2 + 2E (1)
y:
2A = 1 + E (2)
Twice:
4A = 2 + 2E
As (1) and (2) are the same equation:
This reaction has infinite ways to be balancedFor example:
N2O4(g) + CO → NO(g) + CO2(g)+NO2(g)
If you had 15 molecules of H2 and an unlimited supply of N2, how many
NH3 molecules can you make?
N2 + 3H2 --> 2NH3
Answer:
10 molecules of NH₃.
Explanation:
N₂ + 3H₂ --> 2NH₃
As the N₂ supply is unlimited, what we need to do to solve this problem is convert molecules of H₂ into molecules of NH₃. To do so we use the stoichiometric coefficients of the balanced reaction:
15 molecules H₂ * [tex]\frac{2moleculesNH_3}{3moleculesH_2}[/tex] = 10 molecules NH₃10 NH₃ molecules could be prepared from 15 molecules of H₂ and unlimited N₂.
How does publishing in scientific journals help ensure that science leads to
reliable results?
A. It allows results to be reviewed and reproduced by other
scientists.
B. It allows the public to decide if science is worthwhile.
C. It shows which experiments are the most popular with scientists.
D. It gives scientists a reason to do more experiments.
Answer:
A. it allows results to be reviewed and reproduced by other scientists.
describe two sources of energy and explain how they work
please help me (50points)
Solar energy:-
In this way the energy generated through sun light with the help of solar panels and to be used in many works.
Wind energy:-
This is generated by moving turbines with windmills .It is used to create electric energy
But Are Punnett square percentages always correct?
Answer:
yes
Explanation:
cuz is a square and if all angles are equal of a square then it is correct
5. How are the members of Kingdom Archaebacteria different from the
members of Kingdom Plantae?
A. They don't have a nucleus.
B. They don't have cells.
C. They don't need water to live.
6. Where would you probably NOT find a member of the Kingdom
Archaebacteria?
A. In a deep ocean vent.
B. In a very salty lake.
C. On your skin
Answer:
5. C
6. B
Explanation:
sana nakatulong
Archaebacteria do not have a nucleus and the probability of their presence on skin is very low.
What are Archaebacteria?Ancient bacteria called archaebacteria live in harsh conditions.They are distinguished by the absence of peptidoglycan in their cell walls.Unlike all other creatures, their plasma membrane has branching lipids.What is the classification of archaebacteria?They are divided into thermoacidophiles, halophiles, and methanogens.
Where can archaebacteria be found?They are found in harsh environments and are known as extremophiles.They can be found in deep ocean vent.They can be found in very salty lakes.What is the presence on human skin?Archaeal 16 S rRNA genes were found on the skin of every human subject, contributing for up to 4.23 percent of the recovered prokaryotic microbiome.
How are the members of Kingdom Archaebacteria different from the members of Kingdom Plantae?The members of Archaebacteria do not have a nucleus.Therefore option a is correctWhere would you probably not find a member of the kingdom archaebacteria?The probability of the presence of archaebacteria on skin is very low.Therefore, option c is correct.To learn more about archaebacteria, nucleus, and peptidoglycan here,
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ASAP: The main difference between the gravitational force and electrical force is that
1. Gravitational force can only push
2. Gravitational force can pull and push
3. Electrical force can only pull
4. Electrical force can pull and push
Answer:
Electrical force can pull and push
Explanation:
The pressure on 200 milliliters of a gas at constant
temperature is changed from 380 torr to 760 torr. The new
volume of the gas is
answerA) 100 mL
Explanation:
At constant temperature and number of moles, Using Boyle's law
Given ,
V₁ = 200 mL
V₂ = ?
P₁ = 60 kPa
P₂ = 120 kPa
The new volume of the gas is 100mL
Boyle's law is use to calculate the volume of a gas in relation with its pressure. The Boyle's law equation is as follows:
P1V1 = P2V2
Where;
P1 = initial pressure of the gas (torr)
P2 = final pressure of the gas (torr)
V1 = initial volume of the gas (mL)
V2 = final volume of the gas (mL)
According to the information of this question, the pressure on 200mL of a gas changed from 380 torr to 760 torr. Hence;
V1 = 200mL
V2 = ?
P1 = 380torr
P2 = 760torr
Using P1V1 = P2V2
V2 = P1V1/P2
V2 = (380 × 200) ÷ 760
V2 = 76000 ÷ 760
V2 = 100mL
Hence, the new volume of the gas is 100mL
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Λλ(Lamda) Represents what??
Answer:
λ Represents:-
one wavelength of electromagnetic radiationthe decay constant in radioactivityfunction expressions in the lambda calculusa general eigenvalue in linear algebrathe expected number of occurrences in a Poisson distribution in probabilitythe arrival rate in queueing theorythe failure rate in reliability engineeringthe Lagrange multiplier in mathematical optimization, known as the shadow price in economicsthe Lebesgue measure denotes the volume or measure of a Lebesgue measurable setlongitude in geodesylinear densityecliptic longitude in astronomythe Liouville function in number theorythe Carmichael function in number theorythe empty string in formal grammara formal system in mathematical logicthermal conductivitythe Lorentz transformation-TheUnknownScientist
What is the volume, in liters, of 0.350 mol of nitrogen gas at 32°C and
0.980 atm of pressure? *
A. 9.85 L
B. 8.94 L
C. 104.6 L
D. 0.94 L
Answer: The volume is 8.94 L.
Explanation:
Given: no. of moles = 0.350 mol, Pressure = 0.980 atm
Temperature = [tex]32^{o}C = (32 + 273) K = 305 K[/tex]
Formula used to calculate the volume is as follows.
PV = nRT
where,
P = pressure
V = volume
n = number of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into above formula as follows.
[tex]PV = nRT\\0.980 atm \times V = 0.350 mol \times 0.0821 L atm/mol K \times 305 K\\V = 8.94 L[/tex]
Thus, we can conclude that the volume is 8.94 L.
18. Reza has a glass ball filled with water that contains tiny plants and shrimp that eat those plants.
No material can get in or out, but light can get through the glass when it is placed in sunlight
The number of energy storage molecules in the plants and shrimp started out high, but then the
glass ball was moved, and the number of energy storage molecules decreased. Was the glass ball
moved into the light or into the dark? What happened to the amount of carbon in the water?
Answer:
The glass ball was moved into the dark, and there is more carbon in the water.
Explanation:
Reza has a glass ball filled with water that contains tiny plants and shrimp that eat those plants. No material can get in or out, but light can get through the glass when it is placed in sunlight.
The number of energy storage molecules in the plants and shrimp started out high, but then the glass ball was moved, and the number of energy storage molecules decreased. Was the glass ball moved into the light or into the dark? What happened to the amount of carbon in the water?
The glass ball was moved into the dark and the amount of carbon increased in water as there is no photosynthesis taking place.
What is photosynthesis?It is defined as a process by which plants and other photosynthetic organisms convert the light energy in to chemical energy through the process of cellular respiration.
Some of the energy which is converted is stored in molecules of carbohydrates like sugar and starches which are made up of from carbon dioxide and water . Photosynthetic organisms which can perform photosynthesis are algae and cyanobacteria. Photosynthesis is largely responsible for producing and maintaining the content of oxygen in earth's atmosphere.
The process begins with proteins absorbing light energy which are called reaction centers and contain a green pigment which is called chlorophyll . In plants ,these pigments are present inside organelles called chloroplasts while in bacteria they are present in plasma membrane.
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Rank the following solutions from lowest to highest vapor pressure.
Rank from lowest to highest. To rank items as equivalent, overlap them.
10.0 g of potassium acetate KC2H3O2 in 100.0 mL of water
20.0 g of sucrose (C12H22O11) in 100.0 mL of water
20.0 g of glucose (C6H12O6) in 100.0 mL of water
Solution :
When non volatile solute is added to solvent, vapor pressure gets lowered.
Relative lowering in vapor pressure is given :
[tex]$\frac{P^0-P}{P^0}$[/tex] = [tex]$\text{mole fraction}$[/tex] of solute
[tex]$\frac{P^0-P}{P^0}=x_B$[/tex]
[tex]$P^0$[/tex] = vapor pressure of pure solvent
P = vapor pressure of solution
[tex]$x_B$[/tex] = mole fraction of solute
[tex]$x_B=\frac{n_B}{n_A+n_B}$[/tex]
[tex]$n_B $[/tex] = [tex]$\text{number of moles of solute}$[/tex]
[tex]$n_A$[/tex] = [tex]$\text{number of moles of solvent}$[/tex]
Number of moles [tex]$=\frac{\text{weight}}{\text{molecular weight}}$[/tex]
[tex]$\frac{P^0-P}{P^0}=\frac{w_B/M_B}{w_A/M_A+w_B/M_B}$[/tex]
[tex]$\approx \frac{w_B/M_B}{w_A/M_A}$[/tex]
1. For 10 g of [tex]$CH_3COOK$[/tex]
[tex]$CH_3COOK \rightarrow CH_3COO^- + K^+$[/tex]
Ions = 2
It will affect colligative property.
[tex]$\frac{P^0-P}{P^0} = \frac{i \times 10/98}{w_A/M_A}$[/tex]
Relative lowering in vapor pressure will be :
[tex]$=\frac{2 \times 10/98}{w_A/M_A}$[/tex]
[tex]$=\frac{0.20}{w_A/M_A}$[/tex]
2. For 20 g sucrose
Sucrose is non electrolyte, i = 1
[tex]$\frac{P^0-P}{P^0} = \frac{ 20/342}{w_A/M_A}$[/tex]
[tex]$=\frac{0.050}{w_A/M_A}$[/tex]
3. For 20 g of glucose.
Glucose is a non electrolyte, i = 1
[tex]$\frac{P^0-P}{P^0} = \frac{20/180}{w_A/M_A}$[/tex]
[tex]$=\frac{0.11}{w_A/M_A}$[/tex]
[tex]$w_A/M_A$[/tex] is same in all three solutions.
Hence, lowering in vapor pressure is maximum in [tex]$CH_3COOK$[/tex] and minimum is Sucrose.
Vapor pressure from lowest to highest.
10 g of [tex]$CH_3COOK$[/tex] < 20 g of glucose < 20 g of sucrose
The pressure exerted by vapor to the other gas is called vapor pressure.
The formula used to solve the question is as follows:-
[tex]\frac{P^o -P}{P^o}[/tex]
The water vapor depends on the following:-
Water pressureTemperature.After solving the equation, the correct sequence is as follows:-
[tex]CH_3COOK > GLUCOSE > SUCROSE[/tex]
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Two dogs, one with spots and one with no spots have the same mass and
are running with different velocities. Dog 1 (Dog with no spots) has a
velocity of 1 m/s while Dog 2 (Dog with spots) has a velocity of 2 m/s.
Which dog has a larger kinetic energy and how much larger is its kinetic
energy compared to the other dog
Answer:
dog 2 because it is running 1m faster a second than dog 1. Dog 2 can run 1 meter farther in a second than the other dog.
un MODELO ATÓMICO es:
a. Una esfera con partículas positivas y negativas
b. La estructura mínima de la materia.
c. Una serie de descubrimientos.
d. La representación de un átomo donde se explica su comportamiento y características.
Answer:
Creo que es D pero no tan segura
Explanation:
How to pass chem!!!!!!!!!!
Answer:
refer to below
Explanation:
- read your textbook! especially the topics that are most confusing
- as you read, make sure to take notes/make an outline. write the words from the text in your own words. In chem, the textbook explanations are usually very detailed, so putting it in your own words will help you remember and understand what you write.
- make sure you really understand the concepts. don't just memorize what you read.
- draw diagrams and structures. seeing how things are structured will help you visualize what you learn
- ask questions to your teacher. if there is anything confusing, make sure to refer to your teacher as they will hopefully be able to explain it so it won't be confusing
These tips have helped me pass chem with an A. Hope all of this helped!
Answer:
Explanation:
Study material, ask for help, read textbook and do practice problems, get a tutor, beg your teacher for marks,
Air trapped in a cylinder fitted with a piston occupies 142.8 mL at 0.97 kPa pressure.
What is the new volume of air when the pressure is increased to 1.5 kPa by applying force
to the piston?
Answer:
92.344mL
Explanation:
acording to boyle's law that PV=constant then P1V1=P2V2
At a certain temperature the rate of this reaction is first order in HI with a rate constant of 0.0632 s
2HI g = H2 g + I2 g
Suppose a vessel contains HI at a concentration of 1.28M. Calculate how long it takes for the concentration of HI to decrease to 17.0% of its initial value.
Answer:
[tex]28.037\ \text{s}[/tex]
Explanation:
[tex][A]_0[/tex] = Initial concentration = 1.28 M
[tex][A][/tex] = Final concentration = [tex]0.17[A]_0[/tex]
k = Rate constant = 0.0632 s
t = Time taken
For first order reaction we have the relation
[tex]kt=\ln\dfrac{[A]_0}{[A]}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{[A]}}{k}\\\Rightarrow t=\dfrac{\ln\dfrac{[A]_0}{0.17[A]_0}}{0.0632}\\\Rightarrow t=28.037\ \text{s}[/tex]
Time taken to reach the required concentration would be [tex]28.037\ \text{s}[/tex].
If the mass defect for a radionuclide is –8.7839×10-30 kg, what's the binding energy per atom?
Question 7 options:
A)
–7.8944×10-13 J/atom
B)
–4.76×1011 J/atom
C)
–7.8944×10-13 kJ/atom
D)
7.8944×10-13 J/atom
Answer:
A) –7.8944×10-13 J/atom
Explanation:
Mass defect of a radionuclide (m)
[tex]=-8.7839[/tex]×[tex]10^{-30} kg[/tex]
Formula for binding energy
[tex]E=mc^{2}[/tex]
[tex]=(-8.7839x10^{-30} kg)(3x10^{8} m/s)^{2}[/tex]
[tex]E=-7.8944x10^{-13} J/atom[/tex]
If the mass defect for a radionuclide is – 8.7839 × 10⁻³° kg, the binding energy per atom will be –7.8944 × 10⁻¹³ J/atom. The correct option is A.
What is radionuclide?A radionuclide is an unstable nuclide because it contains so much charge. The excess energy is used by the gamma radiation by the nucleus, the electron uses energy to move to another orbital.
Radionuclides are particles that are used to scanning or monitor the radioactive chemicals that are in the body due to swallowing or inhaling.
The binding energy per atom can be calculated by the formula
The mass of defect of a radionuclide (m) is – 8.7839 × 10⁻³° kg
E = mc²
E = – 8.7839 × 10⁻³° x 3 x 10⁸ m/s
E = –7.8944 × 10⁻¹³ J/atom.
Thus, the correct option is A. –7.8944×10-13 J/atom.
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How many liters of SO2 will be produced from 26.9L O2?
Answer:
26.9L of SO2
Explanation:
The reaction between Sulphur and oxygen is as follows:
[tex]S_2 + 2O_2 \to 2SO_2[/tex]
This implies that:
2 moles of oxygen reacts with 1 mole of sulphur to produce 2 moles of SO₂
2 moles of oxygen also yields 2 moles of SO₂
The number of moles of oxygen given is determined as:
[tex]= 26.9 \ L \ of \ O _2 \times (\dfrac{1 \ mol \ of O_2 }{22.4 \ L}) \\\\ = 1.20 \ mol \ of \ O_2[/tex]
The number of moles of SO₂ by using the ratio is:
[tex]= 1.20 \ mol \ of \ O_2 \times (\dfrac{1 \ mol \ of \ SO_2 }{1 \ mol \ O_2}) \\ \\ = 1.20 \ mol \ of SO_2[/tex]
Finally, the volume by applying the new moles is computed as:
[tex]= 1.20 \ moles \ of \ O_2 \times ( \dfrac{1 \ mo \ of \ SO_2}{1 \ mol \ of O_2}) \times ( \dfrac{22.4 }{1 \ mol }) \\ \\ = 26.9 \ L \ of \ SO_2[/tex]
Unlike gases, the behavior of liquids and solids cannot be described by a set of laws that can be applied regardless of the identity of the substance
a. True
b. False
Answer:
a. True
Explanation:
The gases that we study are governed by different laws of physics. Gases behaves according to some given set of laws like the Universal gas laws, Boyles law, Charles law, Gay Lussac's law and many more.
But we do not see a definite pattern or rule when we study solids or liquids. The behavior of the solids and liquids are not described by the set of laws which are applied regardless of the identity of the substance.
Which of these statements does not describe electricity?
A. Lightning is electricity that has built up in the air and travels to the Earth.
B. Electricity cools down devices as it travels through them.
C. Electricity will naturally follow the path of least resistance.
D. Electricity is negatively charged and is attracted to positive charges.
Answer:
answer is B. Electricity cools down devices as it travels through them
Explanation
Will give brainliest
In an experiment, the molar mass of the compound was determined to be 228.276 g/mol. What is the molecular formula of the compound?
Explain why people tend to wear light- colored clothing during the warmer months of the year. Use evidence and scientific reasoning to support your answer
Answer:
because dark colours like black attract light (sun) and heat. light colors reflect more light, (it absorbs less energy and heat from the sun)
Answer:
Because Black color absorbs light better than light-colored.
for example have you ever seen the black car on the road if you touch it very hotter than white car
1. White is the most reflective color. Does not absorb heat like black Make the house not hot.
2. White has the least radiation exposure. Therefore, during the winter night, it will help retain heat for a while. 3. Because white absorbs light as little as possible. Causing the pigment to deteriorate slowly Unlike black that absorbs light well. Causing the color to deteriorate and fade quickly until noticeable
4. If the house next to you is painted white during the day, it will help reflect light into the house.
Why that black color absorbs heat? Even though it abosrbs the light? It comes from the principle that (Substance or material) Black is what absorbs (absorbs) light in every technology.
It absorbs all widths of light, including infrared light. (The infrared itself is hot.)
Black repels self-heating the most because of all colors of light. But there is justice.
How many liters of 3.6 M solution can be made using 110 grams of
lithium bromide (LiBr)?
Answer:
0.2878 liters
Explanation:
It is possible to make 0.2878 liters of 4 M solution of lithium bromide using 100 grams of the compound.