The liquid in Titan's lake is believed to be composed of liquid methane and ethane, which are thought to be supplied by geological processes such as cryovolcanism and seepage from the surrounding terrain. Over time, the liquid in Titan's lake can evaporate, change due to geological or meteorological processes, or be affected by the changing seasons on the moon.
A lithium atom in the excited state contains the same number of electrons as a lithium atom in the ground state. However, in the excited state one or more of the electrons are temporarily located in a higher energy level. Which of the following is the electron configuration for a Li atom in its excited state?
1s23s1
1s22s2
1s2
1s22s1
Answer: 1s2 3s1
Explanation:
Lithium is element number 3 so it has 3 electrons. In the ground state, 2 electrons are in the 1s shell and 1 electron is in the 2s shell.
1s23s1 Correct answer. 2 electrons are still in the 1s shell, but the third electron has jumped to the 3s shell.
1s22s2 Wrong: This atom has gained an additional electron in the 2s shell
1s2 Wrong: This atom has lost an electron.
1s22s1 Wrong: This atom is in its ground state.
Answer:1s22s1
Explanation:
QUESTION 1
What does Group number tells you about the atoms in that Group?
a. number of valence electrons
b. the maximum number of electrons atoms in this Group can accept or give away
c. similarity of properties for the elements in this Group
d. all answers are correct
QUESTION 2
What does a period number tell you about the elements in that period?
a. number of principal energy levels
b. number of valence electrons c.maximum number of electrons atoms can accept or give up
1) number of valence electrons
2) number of principal energy levels
What is the periodic table?The periodic table is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties. It is a useful tool for predicting the chemical behavior of an element and helps in understanding the relationships between elements and their chemical and physical properties.
The periodic table consists of rows and columns, where each element is placed in a specific position based on its atomic number and electron configuration. The elements in the same row (period) have similar electron configurations and exhibit similar chemical behavior, while the elements in the same column (group) have similar chemical and physical properties.
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The molal boiling point elevation constant Kb=1.28, for a certain substance X. When 16. g or urea are dissolved in 150. g of X, the solution boils at 148.8 C. Calculate the boiling point of pure X.
the boiling point of pure X is 146.52 C.
As
ΔTb = Kb × m
ΔTb = Elevation in boiling point = Tb - T°b
m = Molality
So,
Tb - T°b = Kb × [tex]\frac{Wb . 1000}{Wa . Mb}[/tex]
Kb = 1.28
Wb = 16g of urea given
Wa = 150g of X
Mb = 60g = Molar mass of urea
Tb = 148.8 C
Putting values in Equation,
We get, the boiling point of pure X as 146.52 C.
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This is hard
I really need help
I will triple the brainly
New moon is when the Moon cannot be seen because we are looking at the unit half of the Moon.
The new moon phase occurs when the Moon in directly between the Earth and Sun. A solar eclipse can only happen at new moon.
A waxing crescent moon is when the Moon looks like crescent and the crescent increases ("waxes") in size from one day to the next. This phase is usually only seen in the west.
The first quarter moon (or a half moon) is when half of the lit portion of the Moon is visible after waxing crescent phase. It comes a week after new moon.
A waxing Gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape increases ("waxes") in size from one day to the next. The waxing gibbous phase occurs between the first quarter and full moon phases.
A full moon is when we can see the entire lit portion of the Moon.
The total lunar eclipse when the Moon is on the eclipse can only happen at opposite side of the Earth from the Sun, called opposition.
A lunar eclipse can only happen at full moon.
A waxing gibbous moon occurs when more than half of the lit portion of the Moon can be seen and the shape decreases ("waxes") in size from one day to the next. The waning gibbous phase occurs between the full moon and third quarter phases. after th
About Full moonThe full moon generally occurs on the 14th day after the new moon phase. The full moon occurs when the position of the earth is between the moon and the sun in a relatively straight line. The entire sunlit side of the moon becomes visible so that on a full moon, the moon looks completely round and very bright.
During the full moon many parts of the Moon can be seen from Earth, and most of it is the surface form in the form of craters. Because at full moon, some of the craters on the surface of the moon look like there are emission lines coming from the center of the crater.
These lines come from the scattering of particles that were thrown up when meteorites fell to the surface of the moon and formed craters.
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9. If 150 g of water at 25°C are mixed with 75 g of ethyl alcohol at 95°C, find the final temperature of the system.
Enthalpy is the energy that travel through one object to the other when temperatures are different. Therefore, 31.4°C is the final temperature.
What is enthalpy?Enthalpy is the energy that travel through one object to the other when temperatures are different. Enthalpy passes from the hot to the cold object when two object with different temperatures are brought closer.
From one state to another, such as from solid to liquid, from such a solid to a vapour, from either a liquid to a vapour, either from one solid form to another, a substance can absorb enthalpy without increase in temperature.
q=m ×c×ΔT=m ×c×(T −Ti)
q=-m×c×ΔT= -75 ×4.18(T−95°C)
q=m×c×ΔT=150×4.18(T− 25°C )
-75 ×4.18(T−95°C) =150×4.18(T− 25°C )
final temperature=31.4°C
Therefore, 31.4°C is the final temperature.
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Using a new swab each time will prevent contamination and false results
True
False
The statement given above is true.
Use only synthetic fiber swabs that have tiny wire or plastic shafts and were created specifically for sampling nasopharyngeal mucosa. Avoid using swabs made of calcium alginate or those with wooden shafts since they may contain chemicals that render some viruses inactive and thwart molecular testing. Although an OP specimen is a valid specimen type, the CDC advises only collecting the NP specimen. To increase test sensitivity and reduce the usage of testing resources, merge both NP and OP specimens into a single tube if they are obtained.
Maintain proper infection control and use the recommended personal protective equipment (PPE), which includes an N95 or higher-level respirator (or face mask if a respirator is not available), eye protection, gloves, and a gown, for healthcare professionals taking samples from patients or working within 6 feet of patients suspected of having the SARS-CoV-2 virus.
Follow standard precautions for healthcare professionals handling specimens who are not actively involved in the collection (such as handling self-collected specimens) or who are not working within 6 feet of the patient. Whenever they are within a healthcare institution, healthcare personnel should always wear some sort of source protection, such as a face mask.
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Help please!! ill give brainliest
Answer:
What process formed this delta?
A.) erosion and deposition
Explanation:
You're welcome.
Answer:
Erosion and deposition
Explanation:
Erosion happens as a result of the washing away of the top soil and this usually goes along with the deposition of some particles; loose or fine, mainly sand. So yes, the answer is option a.
What are chalcogenes? In chemistry
Answer:
The chalcogens are the elements that belong to group 16 of the modern periodic table (or the oxygen family). Chalcogens consist of five elements – oxygen, sulfur, selenium, tellurium, and polonium.
The chalcogens (ore forming) are the chemical elements in group 16 of the periodic table. This group is also known as the oxygen family. Group 16 consists of the elements oxygen (O), sulfur (S), selenium (Se), tellurium (Te), and the radioactive elements polonium (Po) and livermorium (Lv).Explanation:
Is density constant or variable when method of data collection is changed?
The density should be constant when the method of data collection is changed but it may increase error in measurement.
How may the method of data collection affect the measurement?The method of data collection may affect the measurement because it increases the possibility of undesired errors during the process of experimentation and thus increases uncertainty.
Therefore, with this data, we can see that the method of data collection alters measurements in a given experimental and or observational procedure and may be seen to be affected by the errors in the case of different methodologies applied.
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Which type of molecule is
shown below?
O A. Alkyne
• B. Alkane
O C. Aromatic
O D. Alkene
Question 2
Lead, and chromium are all examples of which of the following?
O organic chemicals
O acids
O heavy metals
O compounds
Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals". The answer is option (c).
Is lead a heavy metal?Lead is one example of a heavy metal. Cobalt and cadmium. They belong to a class of chemicals known as "heavy metals." Metallic substances with a relative high density when compared to water are referred to as heavy metals. Assuming that weight and toxicity are connected, heavy metals have included metalloids like arsenic, which can cause toxicity at low exposure levels.
Although heavy metals are generally found in nature and are necessary for life, they can become poisonous when they build up in organisms. Among the heavy metals that can poison the environment, arsenic, cadmium, and mercury are the most prevalent.
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Suppose a different fatty acid molecule were used, with a molecular volume of 4.48 x 10-22 mL/molecule, and a molar mass of 235 g/mol. Use these data and the expected value for Avogadro's number to calculate its density (g/mL) by dimensional analysis. Hint: try starting with 235 g over 1 mole.
The density of the fatty acid molecule is 8.71 g/mL
What is fatty acid?Fatty acids are the building blocks of the fat in our bodies and in the food we eat.
To calculate the density of the fatty acid molecule using dimensional analysis, we'll start with its molar mass and use Avogadro's number to convert to the number of molecules.
Then, we'll use the volume per molecule to find the total volume and divide the molar mass by the volume to find the density.
First, we'll convert the molar mass to grams per molecule:
235 g/mol / 6.022 x 10^23 molecules/mol = 235 g / (6.022 x 10^23) = 3.9 x 10^-23 g/molecule
Next, we'll find the total volume of the molecules by multiplying the number of molecules by the volume per molecule:
Volume = 4.48 x 10^-22 mL/molecule * 6.022 x 10^23 molecules/mol = 26.95 mL/mol
Finally, we'll divide the molar mass by the volume to find the density:
Density = 235 g/mol / 26.95 mL/mol = 8.71 g/mL
Therefore, The density of the fatty acid molecule is 8.71 g/mL
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Now, cut the style into half and write down your observations. Cut the ovary as shown in the diagram, and squeeze its contents out on a microscopic slide. Add a few drops of water, and add a coverslip. Examine the contents under a magnifying glass or a microscope, and write down your observations.
Answer:
Under magnification, the ovary contents appear as a mixture of clear, yellow, and pink liquid with small round cells. The cells are of varying sizes, some smaller than a human hair. There are also small, translucent, bubble-like structures present. The slide also shows small clusters of cells with a dark center.
A___is a charged particle because it has more or fewer electrons than protons. When
an atom___an electron, it becomes a positively charged ion. When an atom___an electron, it becomes a negatively charged ion.
Answer:
1. ion
2. loses
3. gains/adds
Explanation:
An ion is an atom or group of atoms that has an electric charge. Ions with a positive charge are called cations. Ions with a negative charge are called anions.
When an atom is in neutral state, the number of protons = number of electrons
if an atom loses an electron, now electron count is less than the protons. (electrons < protons), hence it will be more positive.
if an atom gains or adds an electron, now electron count is more than the protons. (electrons > protons), hence it will be more negative.
NH3
Express your answer using four significant figures. What mass%N?
The percent by mass of the nitrogen is 82.4%.
What is the percent by mass?We have to note that the percent by mass can be obtained when we know the molar mass of the compound and that is the first thing that we would need to find in the problem that we have in the question that have been asked.
The molar mass of the compound is; 14 + 3(1) = 17 g/mol
The percent by mass = Mass of N/ molar mass * 100/1
= 14/17 * 100/1
= 82.4%
The nitrogen would have a percent by mass in the compound of about 82.4%
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Select all the measurements that could represent volume.
0 10 ft³
85.5 km²
300 cm²
Due to the fact that this is a generally used (unit)3, such as cubic centimeters, cubic inches, cubic feet, cubic meters, etc., volume is computed for three-dimensional objects and is therefore represented in cubic units or another format of writing cubic unit.
What quantities could be used to indicate volume? Due to the fact that this is a generally used (unit)3, such as cubic centimeters, cubic inches, cubic feet, cubic meters, etc., volume is computed for three-dimensional objects and is therefore represented in cubic units or another format of writing cubic unit.If the length or radius is expressed in cm.It is typically measured in terms of the liter (L), or 1.057 qt in conventional measurements, or the milliliter (mL), or 1/1000 of a liter, or roughly 0.0338 of an ounce.In and out of the laboratory, it is frequently measured using cylinders, flasks, pipettes, or syringes.As an illustration of volume, a learner could use a graduated cylinder to calculate the volume of a chemical solution in milliliters.You could purchase a quart of milk.To learn more about volume refer
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The apparatus shown below can be used to investigate the electrolysis of brine. The gas collecting in the tube above the anode will be what colour?
In the electrolysis of brine, the gas collecting in the tube above the anode will be chlorine gas, which is greenish yellow in color.
What is electrolysis?Electrolysis is a process where an electric current is passed through a solution containing ions (called an electrolyte) to bring about a chemical reaction. This reaction splits the electrolyte into its component ions and distributes them to the electrodes (anode and cathode) connected to the source of electric current.
At the anode, negatively charged ions (anions) gain electrons and become neutral, while at the cathode positively charged ions (cations) lose electrons and become neutral. Chlorine gas is greenish yellow in color due to its chemical properties. When chlorine gas is formed at the anode during the electrolysis of brine, it is produced as a result of the oxidation of chloride ions (Cl-) present in the brine solution.
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A group of engineers has created a biodome filled with air, plants, and animals. No material can get in or out, but sunlight can get in during the daytime. The walls of the biodome are made of a material that absorbs and locks away carbon dioxide from the air so it is not available to the living things inside. What do you predict will happen to carbon in the air over time? How could this affect the living things in the dome?
During the daytime, photosynthesis will occur while over a period of time carbon dioxide will accumulate as a result of respiration making it difficult for living things to survive.
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.
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Please answer my question.
The reaction is correct since the -NHCH3 moiety protonated leading to the hydrolysis of the amine . Option D
What is the hydrolysis of amides?We know that when we talk about hydrolysis, what we ,mean is the fact that there is a compound that is broken up. The breaking up of the compound would lead to the folrmation of the products of the reaction.
In the case of what we have here. We can see that when we react the acid with the amide the point of attack is the -NHCH3 and this would cause it to break off from the amide and then the products are formed.
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QUESTION 7
The electron configuration of an atom is 1s²2s22p63s23p3. The atomic number of the atom is
O 11
03
O 15
O 5
We can write down the electron configuration of bromine using the periodic table's building pieces.
What is Electron Configuration?The amount of electrons in each sublevel and energy level of the ground-state atom is displayed in the electron configuration of an atom. Start at the nucleus and add electrons one at a time until the total number of electrons equals the total number of protons in the nucleus to establish the electron configuration of a specific atom.
The lowest energy sublevel is awarded to each additional electron. The 1s sublevel will be the first to be filled, followed by the 2s and 2p sublevels, the 3s and 3p, the 4s and 3d, and so on. It may be crucial to understand how the electrons in an atom's partially filled sublevel are allocated throughout the orbitals.
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In this lab, you will do experiments to identify types of changes. Using the question format you learned (shown above), write an investigative question that you can answer by doing these experiments.
An investigative question that you can answer by doing these experiments is: what type of change is not easily reversible and which is reversible
What are the two types of changes?The two types of changes are given below:
physical change and chemical changePhysical changes are changes that are easily reversible and which do not result in the formation of new substances. Examples of physical change include the melting of ice, the freezing of water, and the dissolution of sugar in water.
Chemical changes are changes that are not easily reversible and which result in the formation of new substances. Examples of chemical changes are rusting of iron, burning of wood, etc.
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the total pressure of gas collected over water is 650 mmHg and the temperature is 19.5c what is the pressure of hydrogen gas formed in mmHg
The pressure of hydrogen gas formed in mmHg is 633.5mmHg.
Pressure of hydrogen gas = total pressure - vapor pressure of water
Vapor pressure of water at 19°C = 16.5 mmHg
Hydrogen gas pressure = 650.0mmHg to 16.5mmHg = 633.5mmHg
About pressurePressure is the magnitude of a strong pushing force. In Physics, pressure is a popular material whose phenomena we can easily find.
Pressure is the magnitude of the force acting on each unit surface area. The emergence of the pressure phenomenon is the result of a push on an object in a perpendicular direction.
A simple example of the pressure phenomenon is when we stand with two feet pressing against the ground. The push from our feet produces pressure that keeps balance awake.
Pressure is not only related to force but also to area, volume, and temperature. In addition, we can know the factors that affect the amount of pressure based on the type of substance itself.
The international unit for pressure is the newton per unit area (N/m2), while the symbol for pressure is P or p. In addition, another unit of measurement for pressure is Pascal (Pa), which is the last name of the French physicist, Blaise Pascal.
Then it can be stated that 1 N/m2 = 1 Pa
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With which of the following ions would you expect a color change after the addition of acidified potassium permanaganate? Select all that apply.
nitrite
nitrate
carbonate
sulfite
sulfate
phosphate
chromate
The nitrite and sulfite ions would change the colour after the addition of acidified potassium permanganate. Therefore, option A and D are correct.
What do you mean by an ion ?An ion is a positively charged atom or molecule. It is charged because the number of electrons in the atom or molecule does not equal the number of protons.
Depending on whether the number of electrons in an atom is greater or less than the number of protons in the atom, an atom can acquire a positive or negative charge.
When potassium permanganate crystals are dissolved in water, a purple solution is formed. It is a strong oxidizing agent that does not produce toxic byproducts. It's usually made from other minerals like manganese oxide.
Thus, option A and D are correct.
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3.00g of a compound dissolves in 30mL of water. This solution is extracted with 40mL of ether and are in the 2.00g ether phase of the compound. Calculate the distribution coefficient (Kd).
The distribution coefficient measures the ratio of a compound's ionized and non-ionized species in a solution. Therefore, 1.57 is the distribution coefficient.
What is distribution coefficient ?The distribution coefficient measures the ratio of a compound's ionized and non-ionized species in a solution of two separate immiscible phases. This phenomena can be designated as "D."
Here, water or perhaps an aqueous phase is basically one of the immiscible phases. Typically, the other phase is a hydrophobic phase that is inimical to water (or any other aqueous phase we use here). Because it is such a tiny value, we typically express it as a logarithmic value.
distribution coefficient = mass sorbed / mass of solid ÷ mass in solution/ volume of solution
distribution coefficient = 2.00g / 3.00g÷ 3.00g /70
= 0.66/ 0.42
=1.57
Therefore, 1.57 is the distribution coefficient.
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If a gas has a volume of 1.3 L at a pressure of 0.80 atm, how many moles do you have if the temperature is 35°C?
30 points
3.32×10^−5g to micrograms
Express your answer to three significant figures and include the appropriate units.
Check that you have converted between SI units of mass correctly.
3.32 × 10-⁵grams is equivalent to 33.2 micrograms.
How to convert grams to micrograms?Grams is a unit of mass equal to one-thousandth of a kilogram with a symbol of g.
Micrograms is unit of mass equal to one millionth of a gram, or 0.000 001 grams with a symbol of μg or mcg.
According to this question, we were given 3.32 × 10-⁵ micrograms. The conversion factor is as follows:
1 gram = 1000000 (1 × 10⁶) micrograms
Hence, 3.32 × 10-⁵ grams is equivalent to 33.2 micrograms.
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A 367.8 g sample of potassium chlorate (molar mass = 122.55g/mol) was decomposed according to the following equation:
2KClO3 -->2KCl + 3O2 How many moles of oxygen are formed?
a
3.000 mol
b
4.502 mol
c
1.000 mol
d
2.500 mol
According to the stoichiometry of the given chemical equation, there are 4.502 mole of oxygen formed.
What is stoichiometry?It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.
As per the equation 2 moles of potassium chlorate give 3 moles of oxygen , thus 367.8 g sample of potassium chlorate is 367.8/122.55=2.99 moles 2.99 moles of potassium chlorate will give 2.99×3/2=4.502 moles.
Thus, there are 4.502 mole of oxygen formed.
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how do I calculate the number of oxygen atoms in a sample that has a mass of 288 amu's?
Explanation:
To calculate the number of oxygen atoms in a sample of 288 amu, you would need to know the atomic mass of oxygen and the chemical formula of the sample.
Assuming that the sample is made of pure oxygen (O2), the atomic mass of oxygen is 16 amu. So, 288 amu / 16 amu/atom = 18 atoms of oxygen.
Is my answer right ? I use what I know best
H-F is a dipole molecule.
Does H-F is a dipole molecule?H-F is a polar covalent molecule that exhibits dipole-dipole interactions. Because it contains an electronegative atom, F, which is bonded to a H atom, an H-bond exists between its molecules. Because of these H-bonds, -HF molecules exist in liquid form.
Because HF is a polar molecule, it exhibits both dispersion and dipole-dipole forces. However, hydrogen bonding is possible because a hydrogen atom is covalently bonded to a fluorine atom and the same hydrogen atom interacts with a fluorine atom on another HF molecule.
A polar bond exists between H and F. All other molecules have regular geometry and, as a result, have a zero dipole moment.
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When a 0.57-g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 390 g of water from 22.7∘C to 37.5 ∘C .
The energy value of olive oil is 42.37 kJ/g. The enthalpy from the olive oil is 52.198 kJ/mol.
The question isn't complete. A similar question is in the attachment. A calorimeter is a tool that use to measure heat energy according to the equation
Q = m × c × ΔT
m = mass of water in calorimeter = 390 gramsc = specific heat capacity (J/g °C)The heat energy that release
Q = m × c × ΔT
Q = 390 × 4.184 × 14.8
Q = 24,150.048 J
Q = (24,150.048 ÷ 1,000) kJ
Q = 24.15 kJ
The energy value is the ratio between the heat energy and the mass. For this problem
Mass of olive oil = 0.57 gramsQ = 24.15 kJEnergy values = Q ÷ mass = 24.15 ÷ 0.57 = 42.37 kJ/gThe formula to calculate the enthalpy ΔH = Q ÷ n
n = number of moles Q = heat energy = 24.15 kJΔH = enthalpyOlive oil C₈₈H₁₆O₁₀Learn more about heat energy here: brainly.com/question/28842664
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