Answers
Answer:
II and IV.
Explanation:
To know which option is correct, do the following:
Energy (E) and frequency (f) are related by the following equation:
E = hf
Where:
E is the energy.
h is the Planck's constant.
f is the frequency.
From the equation E = hf
Energy is directly proportional to the frequency. This implies that an increase in the frequency will also increase the energy and a decrease in the frequency will also decrease the energy.
Therefore, (II) in the question above is correct.
Velocity (v), wavelength (λ) and frequency (f) are related by the following equation:
v = λf
Divide both side by λ
f = v/λ
Thus, we can see clearly that the frequency is inversely proportional to the wavelength. This means that an increase in frequency will decrease the wavelength and a decrease in frequency will increase the wavelength.
Therefore, (IV) in question above is correct.
Thus, II and IV are the correct answers.
Related Questions
Which of the following is an incorrect representation for a neutral atom?
36Li
613C
3063Cu
1530P
Answers
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97. The incorrect representation for a neutral atom is 36Li
To determine the correct representation for a neutral atom, we need to consider the atomic number (Z) and mass number (A) of the element. The atomic number represents the number of protons in the nucleus, while the mass number represents the sum of protons and neutrons.
Let's analyze the given representations:
36Li:
This representation suggests that the element is lithium (Li) with a mass number of 36, which is incorrect. The correct mass number for lithium is approximately 6.94.
613C:
This representation suggests that the element is carbon (C) with a mass number of 13, which is correct. Carbon has different isotopes, and 13C represents one of its stable isotopes.
3063Cu:
This representation suggests that the element is copper (Cu) with a mass number of 63, which is correct. Copper has different isotopes, and 63Cu represents one of its stable isotopes.
1530P:
This representation suggests that the element is phosphorus (P) with a mass number of 30, which is incorrect. The correct mass number for phosphorus is approximately 30.97.
Therefore, the incorrect representation for a neutral atom is 36Li, as it does not match the known properties of lithium.
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Paul Cezanne's Still Life with Apples in a Bowl (1879-83) represents a break with the tradition of using ____in art.
value
modeled forms
local color
linear perspective
Answers
Linear perspective is a technique used in traditional art to create the illusion of depth and three-dimensional space on a two-dimensional surface. It involves using converging lines and vanishing points to create the illusion of depth and space.
In Cezanne's painting, however, he breaks away from the traditional use of linear perspective and instead emphasizes the flatness of the picture plane. He uses overlapping shapes and changes in color and value to create the illusion of depth, rather than relying on linear perspective. This approach to art is considered a significant break from the traditional use of linear perspective and marks the beginning of modern art.
Help please
Lunar eclipses happen when the _____.
moon passes between the Earth and the sun
Earth passes between the sun and the moon
sun passes between the Earth and the moon
Answers
Answer:
mook passes between the earth and sun
Indicate the hypotheses and the statistical test to be used to analyze the data.
We are interested in the relationship between carbon monoxide concentrations and density of cars in a particular area of Riverside. For a particular street corner on 20 different days, we measure carbon monoxide levels and the number of cars per hour.
Answers
It is assumed that a researcher is interested in examining the connection between a population's carbon monoxide levels and the density of automobiles.
It is evident from the study question that there are two factors: the amount of carbon monoxide present and the density of automobiles. The researcher is interested in determining how closely the variables are related. As a result, the study topic is one of association. The interval/ratio scale is used to assess both variables. The connection is presumed to be linear, and the data's simple random samples can be considered to come from a bivariate normal population. The Pearson correlation test is the right statistical analysis to employ since the variables are assessed on an interval ratio scale.
The following is the null hypothesis:
H0:=0: There is no relationship between carbon monoxide levels and automobiles density.
The alternative theory is as follows:
H0: 0: There is a substantial linear link between the density of automobiles and the carbon monoxide concentration.
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Can someone help me please on this question like quick?
Answers
Solar energy does not give off toxic wastes as nuclear energy does (ex. Chernobyl)
How many moles of aluminum ions al3+ are present in 0.42 mol of al2so43
Answers
There are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.
To determine the number of moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3, we need to consider the stoichiometry of the compound.
The formula of aluminum sulfate (Al2(SO4)3) indicates that for every 1 mole of the compound, there are 2 moles of aluminum ions (Al3+). This means that the mole ratio of Al3+ to Al2(SO4)3 is 2:1.
Given that we have 0.42 mol of Al2(SO4)3, we can calculate the moles of Al3+ as follows:
Moles of Al3+ = 0.42 mol Al2(SO4)3 x (2 mol Al3+ / 1 mol Al2(SO4)3)
Moles of Al3+ = 0.42 mol Al2(SO4)3 x 2
Moles of Al3+ = 0.84 mol Al3+
Therefore, there are 0.84 moles of aluminum ions (Al3+) present in 0.42 mol of Al2(SO4)3.
It's important to note that the stoichiometry of the compound determines the mole ratio between the different species involved in the chemical formula. In this case, the 2:1 ratio of Al3+ to Al2(SO4)3 allows us to determine the number of moles of Al3+ based on the given amount of Al2(SO4)3.
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Why was 1990 an important year regarding air quality?
O The United States took first steps to keep the air clean.
O The United States created the Environmental Protection Agency.
Modifications and improvements were made to the Clean Air Act.
O Funding was established under the Clean Air Act to study air pollution.
Answers
Answer:
C. Modifications and improvements were made to the Clean Air Act.
Explanation:
The Clean Air act was originally established in 1970 and was concerned with the aim of protecting people and the environment in general from polluted air. Polluted air could cause different illnesses and environmental degradation.
The law was amended in 1990 in which modifications and improvements were made to the Clean Air Act. There was the need to reduce acid rain, toxic emissions which could deplete the ozone layer and cause varying respiratory illnesses in humans and to increase visibility.
1990 was an important year to to the United States regarding Air Quality because "Modifications and improvements were made to the Clean Air Act." (Option C)
How is this so?In reality, 1990 was an important year for air quality due to the enactment of significant amendments to the Clean Air Act in the United States.
These amendments, signed into law in November 1990, introduced stricter regulations and requirements to combat air pollution.
The amendments addressed various pollutants, including sulfur dioxide, nitrogen oxides, and hazardous air pollutants, leading to improved air quality standards and a more comprehensive approach to protecting human health and the environment from the harmful effects of air pollution.
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Which is the best example of a new substance forming?
cutting a piece of paper
lighting a match
popping a balloon
hitting a nail with a hammer
Answers
C3H7OH + O2 -> CO2 + H20balance the equation then find mole ratio of oxygen to water, how many mores of carbon dioxide are produced when 4.6 mol of oxygen react, and how many molecules of C3H7OH will react with 4.6 L of O2?
Answers
mole ratio = 9:8
moles of CO2 = 3.07moles
molecules of C3H7OH = 2.75 * 10^22 molecules
ExplanationsThe balanced form of the chemical rreaction is as shown below;
\(2C_3H_7OH+9O_2\rightarrow6CO_2+8H_2O\)The mole ratio of oxygen to water as shown in the equation is 9:8
Given the following parameter
mole of oxygen that reacted = 4.6moles
According to stoichiometry, 9moles of oxygen produces 6 moles of caron dioxide. The moles of CO2 that is required will be expressed as:
\(\begin{gathered} moles\text{ of CO}_2=\frac{6}{9}\times4.6moles\text{ of O}_2 \\ moles\text{ of CO}_2=3.07moles \end{gathered}\)Hence the moles of CO2 that will be produced is 3.07moles
Also if 4.6L of O2 reacted, the moles of oxygen that reacted will be;
\(\begin{gathered} moles\text{ of O}_2=\frac{4.6}{22.4}(1mole\text{ = 22.4L}) \\ moles\text{ of O}_2=0.205moles \end{gathered}\)According to stochiometry, 2 moles of C3H7OH reacts with 9moles of oxygen, the moles of C3H7OH required will be:
\(\begin{gathered} moles\text{ of C}_3H_7OH=\frac{2}{9}\times0.205 \\ moles\text{ of C}_3H_7OH=0.0456moles \end{gathered}\)Convert the moles of C3H7OH to molecules as shown
\(\begin{gathered} molecules\text{ of }C_3H_7OH=0.0456\times6.02\times10^{23} \\ molecules\text{ of }C_3H_7OH=0.275\times10^{23} \\ molecules\text{ of }C_3H_7OH=2.75\times10^{22}molecules \end{gathered}\)Na
Η Ο
Is this an element or a compound?
Answers
Answer:
compound
Explanation:
because h is hydrogen, then O is oxygen
how many grams is 10 moles of H2O?
Answers
Answer:
So, 10 mole of water will weigh (18x10) = 180g.
(1) Some years ago, a crucial experimental error was made during the work-up of the reaction. Instead of adding the reaction mixture to the cold acid solution, the inverse addition was carried out. What do you think happened when the acid solution was added to the reaction mixture
Answers
Answer:
Salts will be formed and the pH of the new mixture will fall.
Explanation:
What should be: The reaction mixture should be added to the cold acid solution.
The error: Cold acid solution was added to the reaction mixture.
What happens with this?
The neutralization of a solution creates salts. The combination of positive and negative ions in the reaction also forms water. Assuming the pH of the reaction mixture was neutral before the addition of the acid, after the addition of the acid solution the pH will drop. Recall that a neutral solution has a pH of 7. So the pH of this new solution will drop to less than 7 because of the addition of an acid.
If the required procedure for the chemical process was followed, the reaction mixture added to the cold acid would have resulted in a stronger base solution. In other words, the pH of the new solution would be higher.
How does an atom become a positively charged lon?
A. by gaining one or more electrons
B. by gaining one or more neutrons
C. by losing one or more electrons
D. by losing one or more neutrons
Answers
Answer:
your answer would be C
Explanation:
atoms that picks up the extra electron becomes a negatively charged ion (anion)
if we reverse that,
it would be a positively charged ion due to losing an electron
Draw all structural and geometric isomers of butene and name them
Answers
Alkene is an unsaturated hydrocarbon which contain at least one carbon-carbon double bond. Here butene is an alkene with the chemical formula C₄H₈. The functional group present in alkenes is the double bond.
The structural isomers are those isomers in which the atoms are completely arranged in a different order but have the same molecular formulas. It is also called the constitutional isomers.
Geometric isomers are two or more compounds with the same number and types of atoms and bonds but have different geometries for the atoms.
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Arrange the following triglyceride molecules according to their melting points. Rank from lowest to highest.
Answers
Step 1 - Understanding the relation between structure and melting point
The melting point of a substance of a measure of the intensity of its intermolecular forces. If a molecule interacts rather strongly with the other molecules, it will be harder to pull them apart.
Therefore, since the structure of a molecule may determine the strenght of its molecular forces, the melting point can be explained based on the chemical structure. Double bonds, for example, are an important structural feature that can significantly change the melting point.
Step 2 - Understanding how double bonds change the melting point of triglycerides
The molecules in the picture are triglycerides. Note that some of them have double bonds, while others do not, or differ in the number of double bonds. Molecules without double bonds tend to be more linear than molecules with double bonds, thus interacting more strongly with neighbour molecules:
Note that while the first molecule is linear, the second one, which has a double bond, has rather a rough shape. The consequence is that its intermolecular interactions are less strong.
We can state thus that the greater the number of double bonds, the lowest the melting point, due to structural properties.
Step 3 - Ranking the melting points of the molecules in the picture
Let's call the molecules A, B, C and D, respectively. Note that:
molecule A has no double bonds
molecule B has two double bonds
molecule C has six double bonds
molecule D has three double bonds
According to the rule of thumb we established in step 2, the melting points, from lowest to highest, would be:
\(C
How many kilojoules are required to melt 15 g of ice at 0 degrees C, and raise the temperature of the liquid that forms to 85 degrees C?
Answers
Answer:
10026 joules
Explanation:
its right.
Dominic made the table below to organize his notes about mixtures. A 1-column table. The first column labeled properties of mixtures has entries has no set composition, must have more than one state of matter, must have more than one substance. What mistake did Dominic make? The title should read “Properties of Solutions” because some mixtures do not have all of the properties listed. There is a definite recipe to make each mixture, so the composition of a mixture is set. Although it is possible to have more than one state, it is also possible to have only one state. A single substance can be used to make a mixture if the substance is composed of more than one element.
Answers
Answer:
Exxplanation:
Answer:
Although it is possible to have more than one state, it is also possible to have only one state.
Explanation:
The absorption of 350 calories changes the temperature of a sample of water from 35°C to 62°C. What is the mass of the water?
Answers
The mass of water used is 50.0-g and the precise warmness of water (C) is 1.0 cal/g °C. those values will give you the warmth gained in calories. Q = m × C × ∆T = 50.0 g × 1.zero cal/g°C × 5.three °C = 265 cal.
answer °C = 265 cal.
Measurement of heat is finished in energy. One calorie is the quantity of energy required to raise one gram of water one diploma Celsius. To degree heat, you divide the alternate temperature of a sample of water by way of the mass of the water.
Mass is constantly regular for a body. One way to calculate mass is Mass = quantity × density. Weight is the measure of the gravitational force performing on a mass. The SI unit of mass is "kilogram".
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A triacylglycerol consists of _______ and ______ fatty acids. A glycerophospholipid is different in that it also consists of _______ but has ______ fatty acids. The hydroxyl group on its ______ carbon is attached by a phosphate bond to _______, which is attached by a phosphate ester bond to an ionized amino alcohol.
Answers
Answer:
1. Glycerol
2. Three
3. Bilayer membrane
4. diglyceride
5. 1 and 2 (C1 and C2)
6. C3
Explanation:
A triglyceride is defined as an ester which consists of glycerol and three fatty acids.
Glycerophospholipid are different from triglyceride as they are also consist of the membrane bilayer, which make a tough cell membrane and help them to hold the definite shape. Glycerophospholipids carry two or diglyceride fatty acid.
Hydroxyl group in glycerophospholipid is present in C1 and C2 and a phosphate group is attached at C3 (Carbon-3) with phosphodiester bond.
Hence, the correct answers are:
1. Glycerol
2. Three
3. Bilayer membrane
4. diglyceride
5. 1 and 2 (C1 and C2)
6. C3
How much HNO3 can be made from 25.0 g of NO2 according to the following reaction?
3 NO2 + H2O → 2 HNO3 + NO
Answers
The amount of \(HNO_3\) that can be made from 25.0 g of \(NO_2\) according to the reaction would be 22.68 grams.
Stoichiometric problemsFrom the balanced equation of the reaction:
\(3 NO_2 + H_2O -- > 2 HNO_3 + NO\)
The mole ratio of \(NO_2\) and \(HNO_3\) is 3:2. In other words, for every 3 moles of \(NO_2\) that react, 2 moles of \(HNO_3\) are produced.
If mole = mass/molar mass
25.0 g of \(NO_2\) will be equivalent to (the molar mass of \(NO_2\) is 46 g/mol):
25/46 = 0.54 moles
From, the mole ratio of 3:2, 0.54 moles of \(NO_2\) will require:
2/3 x 0.54 = 0.36 moles of \(HNO_3\)
The molar mass of \(HNO_3\) is 63.01 g/mol.
Mass of 0.36 moles of \(HNO_3\) = 0.36 x 63.01
= 22.68 g
Thus, the mass of \(HNO_3\) that can be made from the reaction is 22.68 grams.
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Why is the classification species not considered a group? (1 point)
O Each species is a separate type of organism.
O Each species is an individual organism.
O Each species lacks the characteristics of the levels above.
O Each species shares characteristics with other species.
Answers
Each species is a separate type of organism.
A species is a group of creatures that share similar traits. The same species of organisms are capable of sexual reproduction as well as interbreeding and producing fertile offspring. It is a fundamental unit of taxonomy and classification.The system is divided into seven categories: Kingdom, Phylum or Division, Class, Order, Family, Genus, and Species. Kingdom is the most inclusive category.In a group, many types of an organism can be included even if they do not share the same traits. But species is a group of organisms that share similar traits.For example, human beings are species as they are all alike in physical features, way of reproduction, etc. But the animal is considered a group because it included a variety of living beings.Therefore, Each species is not considered a group.
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Can somebody please help me understand this? I don't understand what I need to do to solve any of the parts.
Answers
This technique has been used to identify the presence of gases such as oxygen, methane, and carbon dioxide in the atmospheres of exoplanets.
i) To estimate the frequency of the violet (leftmost) emission, we can use the equation v = c/λ, where v is frequency, c is the speed of light (3.00 x 10^8 m/s), and λ is the wavelength of the emission in meters. The wavelength of the violet emission is 400 nm or 400 x 10^-9 m, so the frequency can be calculated as v = (3.00 x 10^8 m/s) / (400 x 10^-9 m) = 7.50 x 10^14 Hz.
ii) To estimate the energy of the violet emission, we can use the equation E = hv, where E is energy, h is Planck's constant (6.63 x 10^-34 Js), and v is frequency in Hz. Substituting the frequency calculated in part (i), we get E = (6.63 x 10^-34 Js) x (7.50 x 10^14 Hz) = 4.97 x 10^-19 J.
b. The spectral lines are produced by the electrons within the atoms of this element, which can absorb or emit specific amounts of energy to move between different energy levels. These energy transitions result in the emission or absorption of photons with specific wavelengths and frequencies, giving rise to the observed emission spectrum.
c. The violet emission line represents the photon with the most energy since it has the shortest wavelength (400 nm) and highest frequency (7.50 x 10^14 Hz) among the lines shown. This highest energy does not necessarily represent the energy of the valence electrons, but rather corresponds to the specific energy transitions occurring within the atoms of the element.
d. Emission spectra can be used to determine the gases present in the atmosphere of a far-away planet by analyzing the specific wavelengths of the emitted or absorbed light from the planet. Each gas has a unique emission or absorption spectrum, allowing scientists to identify the gases present in the planet's atmosphere.
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Using the figure below, would this rate of chemical weathering increases or decreases when the blocks are made into smaller pieces? Why does the area increases to the rights?
Answers
The rate of chemical weathering increases when the blocks are made into smaller pieces.
Why does the area increases to the rights?Smaller portions of the rock are more easily subject to chemical weathering than a single large piece. The surface area of smaller particles allows for greater gas and water reactions with the rock. Surface area is effectively increased by mechanical weathering.What is the meaning of chemical weathering?Chemical weathering causes changes in the molecular structure of rocks and soil. For instance, occasionally, water and carbon dioxide from the air or soil combine in a process called as carbonation. As a result, carbonic acid is produced, a weak acid capable of dissolving rock.What causes chemical weathering to happen?The process by which chemicals in rainwater change the minerals in a rock is known as chemical weathering. The carbon dioxide in the air dissolves in the rainwater, making it somewhat acidic. A reaction between the minerals in the rock and precipitation can cause weathering.To learn more about chemical weathering visit:
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What is the function of the digestive system? :)
Answers
When you eat food goes through your body and comes out as waste the digestive tract digests said food you console
Answer:
it digest are food
Explanation:
the digestive system helps to digest are food, ot also breaks down the food with acid in our stomach.
The graph below shows how solubility changes with temperature.
Solubility vs. Temperature for a variety of salts
90
80
70
60
50
40
30
20
10
10 20 30 40 50 60 70 80 90
Temperature (°C)
Solubility (g salt/100 g H₂O)
Which two solutions have similar solubilities at 40°C?
O Na2SO4 and NaCl
O Na2HASO4 and NaCl
100
NaCl
Na₂HASO4
Ba(NO3)2
Na2SO4
Ce2(SO4)3 9H20
Answers
The two solutions that have similar solubilities at 40°C will be Na₂HAsO₄ and Na₂SO₄.
What is solubity ?
It is the ability of a solute to be dissolved, especially in water.
As the temperature increases the solubility of the gas generally decreases"
According to given information and graph attached as reference ;
Solubility of NaCl (sodium chloride) at 40°C is 36.3 grams.Solubility of Na₂SO₄ (sodium sulfate) at 40°C is 48.8 grams.Solubility of Na₂HAsO₄ (sodium arsenate dibasic) at 40°C is 48.9grams.Solubility of Ba(NO₃)₂ (barium nitrate) at 40°C is 14.1 grams.Solubility of Ce₂(SO₄)₃·9H₂O (ceasium sulfate nonahydrate) at 40°C is 6.2 grams.
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Answer:
it's D 240
Explanation:
I took the
2. What weight of:
i)
sodium hydroxide would correspond to 2 moles?
ii)
water would correspond to 0.5 mole?
iii)
nitrogen atoms would correspond to 0.1 mole?
Answers
Which 2 elements has reactivity that is similar to chlorine?
Answers
what r variable's :) :) :) :) :)
Answers
Answer: an element, feature, or factor that is liable to vary or change.
"there are too many variables involved to make any meaningful predictions"
Explanation:
Answer:
A variable is any characteristics, number, or quantity that can be measured or counted.
Explanation:
What is the systematic name of the following compound?
Li2S
Choose 1 answer:
А
Lithium sulfate
B В
Lithium sulfide
Dilithium sulfate
Dilithium sulfide
Answers
Explanation:
Lithium sulfide
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10. When dissolved in water, most Group 1 metal salts can be described as
strong electrolytes.
strong acids.
weak electrolytes.
A
B
C
D
non-electrolytes.
(1)
Answers
When dissolved in water, most Group 1 metal salts can be described as strong electrolytes.
When Group 1 metal salts are dissolved in water, they can be described as strong electrolytes. This is because Group 1 metals, such as lithium (Li), sodium (Na), potassium (K), and so on, readily lose their outermost valence electron to form positive ions (cations). These cations then dissociate completely in water, separating from the anions to which they were originally bonded.
The dissociation of Group 1 metal salts in water results in the formation of positively charged metal ions and negatively charged non-metal ions (anions). These ions are free to move and conduct electric current, making the solution a good conductor of electricity. The complete dissociation of Group 1 metal salts in water and the presence of freely moving ions make them strong electrolytes.
Strong electrolytes are substances that ionize completely or almost completely in solution, producing a high concentration of ions. This is in contrast to weak electrolytes, which only partially ionize and produce a lower concentration of ions.
In summary, when Group 1 metal salts are dissolved in water, they form strong electrolytes due to their ability to dissociate completely into ions, leading to a high concentration of freely moving ions in the solution, thus enabling efficient electrical conductivity.
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