2
Probes are sometimes sent into space. Some have been sent to orbit planets. Landing
on a planet, however, is necessary to gather what kind of data?
А
Taking photographs
B
Measuring diameter
с
Collecting soil samples
D
Determining temperature of atmosphere
Answers
Answer:
Determining temperature of atmosphere
Related Questions
The main-group elements are the forty-four elements that occupy groups 1A-8A of the periodic table. Main-group elements are important because of their high natural abundance both in the Earth's crust and in the human body and are commercially valuable. Review the families containing main group elements. Identify all the characteristics that apply to the elements in family IA.
Answers
Answer:
The answer is a,b, and c. This is for the USA tesprep videos
Explanation:
The characteristics that apply to the elements in the family are they are highly reactive, they are shiny, soft metals and the element form +1 ions when forming compounds. Thus option a, b and c is correct.
What are main group elements?Main group elements are defined as any of the element belonging to the s and p blocks of the periodic table.
They are most abundant element in universe and on earth.
This elements and their compound are one of the most important economical elements.
They are very good conductor of heat and electricity.
Thus, the characteristics that apply to the elements in the family are they are highly reactive, they are shiny, soft metals and the element form +1 ions when forming compounds. Thus option a, b and c is correct.
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Arrhenius bases release _____ into water?
A. Protons H+
B. Hydroxide Ions OH-
C. Electrons
ANSWER: HYDROXIDE IONS OH-
Answers
Arrhenius bases release hydroxide ions (OH-) into water. Therefore option B is correct.
According to the Arrhenius theory of acids and bases, a base is defined as a substance that, when dissolved in water, increases the concentration of hydroxide ions (OH-).
When a base is dissolved in water, it dissociates into its constituent ions. For example, when sodium hydroxide (NaOH) is dissolved in water, it dissociates into sodium ions (Na+) and hydroxide ions (OH-):
NaOH (s) → Na+ (aq) + OH- (aq)
The hydroxide ions (OH-) released from the dissociation of the base then interact with water molecules to form hydroxide ions in solution:
OH- (aq) + H2O (l) ↔ OH- (aq) + H3O+ (aq)
In this reaction, the hydroxide ion (OH-) accepts a proton (H+) from a water molecule, resulting in the formation of a hydronium ion (H3O+).
Thus, Arrhenius bases release hydroxide ions (OH-) into water, which can subsequently react with hydronium ions (H3O+) to form water molecules and maintain the pH balance in the solution.
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Both Arrhenius and Bronsted-Lowry defintions of an acid are similar. According to both of these definitions, an acid is a compound that -
donates a pair of electrons
contains a nonmetal anion
donates a hydrogen ion
should be labeled as corrosive
Answers
Answer:Donates a hydrogen ion
Explanation:
How many grams are equal to 3.46 moles of iodine
?
Answers
875.38 g are equal to 3.46 moles of iodine.
What is moles?The mole is the SI basic unit of substance quantity, with the sign mol. The amount of substance in an object or sample is defined as the number of elementary entities of that substance.
It is given that n = 3.46, molar mass of iodine = 253 g/mol.
Moles can be expressed as:
Moles = mass /molar mass
3.46 mol= mass / 253 g/mol.
mass = 253 g/mol ×3.46 mol
mass = 875.38 g.
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What is the only nonmetal with four valence electrons?.
Answers
Answer:
Carbon
Explanation:
I just finished this and that's what I got from my periodic table.
Identify the molecular geometry corresponding to each expected bond angle around the central atom.
a. Linear b. Trigonal pyramidal c. Trigonal planar d. Tetrahedral
Answers
In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.
In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.
In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.
In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.
In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.
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How many atoms of each element are in one molecule of 2-heptanone?
Answers
Earth's gravitational potential energy: GPE = mgh = Gravity (9.81m/s2) *
Mass (kg) x Height (m)
Kinetic energy: KE= Imov?
How do the mass and speed of an object affect the kinetic energy?
Answers
Answer:
as mass and the square of speed is directly proportional to the the kinetic enegry so, more there will be mass and speed there will be more kinetic enegry.
50 POINTS!! CAN SOMEONE PLEASEEEE HELP ME do this for my chemistry class please i need it done asap!! to give me the answers your probably going to have to write it on paper then attach the picture to your answer!! thank you so much!! <3
Answers
Answer:
lewis structures :
Explanation:
4 electrons
6 electrons outer shell
3 outer shell
2 outer shell
7 outer shell
1 outer shell.
v
PLEASE ANSWER NOW THANK YOU
Answers
Answer:the plants received more sunlight
Explanation:
A sample of the greenhouse gas, methane ( CH4 ) at a pressure of 121.59 kPa, a volume of 31 liters, and a temperature of 360.15 K. How many moles (n) of gas and grams (g) of gas are in the sample
Answers
PV = nRT
where:
P = pressure (in Pa)
V = volume (in m^3)
n = number of moles
R = universal gas constant (8.31 J/(mol·K))
T = temperature (in K)
First, we need to convert the given pressure, volume, and temperature to SI units:
Pressure = 121.59 kPa = 121.59 x 10^3 Pa
Volume = 31 L = 31 x 10^-3 m^3
Temperature = 360.15 K
Now we can plug in the values and solve for n:
n = (PV) / (RT)
n = (121.59 x 10^3 Pa * 31 x 10^-3 m^3) / (8.31 J/(mol·K) * 360.15 K)
n = 1.48 mol
So the sample contains 1.48 moles of methane.
To find the mass of the gas, we can use the molar mass of methane:
Molar mass of CH4 = 12.01 g/mol (for carbon) + 4 x 1.01 g/mol (for hydrogen) = 16.05 g/mol
Now we can use the formula:
mass = n x M
mass = 1.48 mol x 16.05 g/mol
mass = 23.74 g
So the sample contains 1.48 moles and 23.74 grams of methane.
You have 1.20 x 10 24 molecules of H2O. What is the mass of this sample?
Answers
Answer:
\(35.86~g~H_2O\)
Explanation:
In this case, we have to remember that relationship between the avogadro's number and the "mol" concept:
\(1~mol=6.023x10^2^3~molcules\)
With this in mind, we can do the first conversion:
\(1.20x10^2^4~molecules~of~H_2O\frac{1~mol_H_2O}{6.023x10^2^3~molcules~of~H_2O}=1.99~mol_H_2O\)
Now, if we calculate the molar mass of \(H_2O\). The atomic mass of O is 16 g/mol and the atomic mass of H is 1 g/mol, so:
(16*1)+(1*2)= 18 g/mol
In other words, \(1~mol~H_2O=~18~g~H_2O\), so:
\(1.99~mol_H_2O\frac{18~g~H_2O}{1~mol~H_2O}=35.86~g~H_2O\)
I hope it helps!
Why is it impossible for an electron to have the quantum numbers n = 1, l = 1, ml = 0, ms = –? (2 points)
Answers
The spin of the electron is represented by the spin quantum number, ms; ms = +1/2 or -1/2.
Electron in orbital type 2pz.
The primary quantum number, n=1, 2, 3, and n=2 (the second energy level), is one of the four quantum numbers that are assigned to each electron in an atom to define that electron's state.
An atomic orbital's azimuthal quantum number characterizes the form of the orbital and is used to calculate the orbital's angular momentum. When l = 1, the p subshell is defined as l = 0,1...n-1.
The orbital in which the electron is placed is indicated by the magnetic quantum number, ml. ml = -l...+l, and ml = 0 indicates the Pz orbital.
The spin of the electron is represented by the spin quantum number, ms; ms = +1/2 or -1/2.
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Consider the Lewis structure for the nitric acid molecule, HNO3, and select the false statement.
A) More than one resonance structure is required.
B) The N–O bond order is 4/3.
C) In water, the H–N bond is broken to form H3O+.
D) The formal charge on nitrogen is +1.
E) The oxidation state of nitrogen is +5.
Answers
The false statement regarding the Lewis structure for the nitric acid molecule, HNO3, is option B) The N-O bond order is 4/3.
The N-O bond order is actually 4/3 in one of the resonance structures of HNO3, but not in the overall molecule. The molecule requires more than one resonance structure, as stated in option A.
In water, HNO3 will dissociate to form H+ and NO3-, not H3O+, as stated in option C.
The formal charge on nitrogen can be calculated as 5-(0+6/2+2x2/2)=0, not +1 as stated in option D.
The oxidation state of nitrogen can be calculated as the sum of valence electrons of nitrogen and the electrons it has gained or lost, which is +5 in HNO3, as stated in option E.
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A 475 mg sample of the weak monoprotic acid dimethylglycine, N(CH3)2CH2COOH, is dissolved in some water. What is the minimum volume, in mL, of a 0. 100 M calcium hydroxide solution required to neutralize all of the acid?
Answers
The minimum volume of a 0.100 M calcium hydroxide solution required to neutralize all of the dimethylglycine is 41.2 mL.
The balanced chemical equation for the reaction between dimethylglycine and calcium hydroxide is:
N(CH3)2CH2COOH + Ca(OH)2 → Ca(N(CH3)2CH2COO)2 + 2H2O
From the equation, we can see that 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide. We can use this information to calculate the amount of calcium hydroxide required to neutralize the acid.
First, we need to determine the number of moles of dimethylglycine in the sample:
molar mass of dimethylglycine = 115.13 g/mol
number of moles = 475 mg / 1000 mg/g / 115.13 g/mol = 0.00412 mol
Since 1 mole of dimethylglycine reacts with 1 mole of calcium hydroxide, we need 0.00412 mol of calcium hydroxide to neutralize the acid.
Finally, we can use the molarity of the calcium hydroxide solution to determine the volume required:
moles of Ca(OH)2 = 0.00412 mol
volume of Ca(OH)2 solution = moles / molarity = 0.00412 mol / 0.100 mol/L = 0.0412 L
Converting this to milliliters:
volume of Ca(OH)2 solution = 41.2 mL
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Consider the statement below.
“When nitrogen is liquefied, heat is released.”
Is this statement true or false?
Answers
Answer:
True
Explanation:
It is true because heat is released when a gas changes to a liquid.
Answer:
True
Explanation:just took the test
Which of these statements best describes the cause of this expansion?
A. Conductuion of heat from the mantle is expanding the crustal plates that hold the Alantic ocean
B. Convection within the mantle is bringing magma up to the crust in the middlw of the Atlantic Ocean,building new sea floor
C. As the crustal plates that hold the mainland of North America and Europe get older, they sink, causing the Atlanic Ocean to spread
D. At the mid-Atlantic Ridge, the crustal plates hold North America and Eurioe are colliding together, causing volcanic activivty and earthquakes
*I HAVE 6 DAYS UNTIL THIS IS DUE*
Answers
Answer:
B. Convection within the mantle is bringing magma up to the crust in the middlw of the Atlantic Ocean,building new sea floor. Do you have mrs cogliati?
Explanation:
i have it 4 mrs.cogliati
Where do convection currents occur?
A.
In areas with the same temperature
B.
In areas with different air pressures
C.
In areas with the same altitude
D.
In areas with different cloud types
Answers
Answer:
a because where the air travels for example a radiator
Answer:
C.
In areas with the same altitude
Explanation:
what is meant bt absolute 0 temperature?
Answers
Absolute zero is an idea in thermodynamics that describes the lowest energy system.
Explanation:Thermodynamics
Thermodynamics is the study of thermal energy and heat. One of the most important ideas in thermodynamics is entropy. Entropy is defined as the chaos within a system. Chaos is the movement or different orientations of molecules in a system. Entropy is related to temperature; the higher the temperature, the higher the entropy. High entropy means there is a large amount of chaos in a system, while low entropy is low chaos.
Absolute zero
Absolute zero occurs when the temperature of a system is 0 kelvin or -273.15 °C. Zero kelvin is the theoretical temperature in which entropy equals 0. This means that there is no movement or energy within a system. Absolute zero is the lowest energy a system can possibly have.
carbohydrates are polymers formed of structural units calledgroup of answer choicesamino acids.monosaccharidesphosphate groups.fatty acids.
Answers
Carbohydrates are polymers formed of structural units called monosaccharides.
What are Monosaccharides?Monosaccharides, often known as simple sugars, are the most fundamental forms of sugar and the monomers from which all other types of carbohydrates are constructed. Typically, these substances are colorless, soluble in water, and crystalline in appearance. Only certain monosaccharides, despite their common name (sugars), have a flavor that may be described as sweet.
The chains of the most common monosaccharides are unbranched and single-bonded, and they comprise anywhere from three to six carbon atoms. Glucose (also known as dextrose), fructose, galactose, xylose, and ribose are a few examples of monosaccharides. Monosaccharides are the fundamental components from which disaccharides such as sucrose (table sugar) and polysaccharides are produced (such as cellulose and starch).
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The electrolysis of water forms h2 and o2. 2h2o right arrow. 2h2 o2 what is the percent yield of o2 if 10.2 g of o2 is produced from the decomposition of 17.0 g of h2o? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 15.1% 33.8% 60.1% 67.6%
Answers
The percent yield of oxygen if 10.2 g of O₂ is produced from the decomposition of 17.0 g of H₂O is 67.6%.
How do we calculate moles from mass?Moles (n) of any substance can be calculated by using their mass as:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
2H₂O → 2H₂ + O₂
Moles of 17g H₂O = 17g / 18.02 g/mol = 0.943 moles
From the stoichiometry of the reaction it is clear that,
2 moles of H₂O = produces 1 mole of O₂
0.943 moles of H₂O = produces 1/2×0.943=0.471 mole of O₂
Now mass of this 0.471 moles of O₂ = (0.472mol)(32g/mol) = 15.104 grams
Actual mass of oxygen = 10.2g (given)
Now on putting vales on the percent yield formula, we get
% yield = (10.2 / 15.104)×100% = 67.53% = 67.6%
Hence the required value of percent yield is 67.6%.
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Answer:67.6
Explanation:bc im just that good
A can contains a gas with a volume of 86 mL at 30oC. What is the volume in the can if it is heated to 65oC?
Answers
Answer:
New volume of gas = 95.93 ml (Approx)
Explanation:
Given:
Old volume of gas = 86 ml
Old temperature = 30°C = 30 + 273 = 303 K
New temperature = 65°C = 65 + 273 = 338 K
Find:
New volume of gas
Computation:
V1T2 = V2T1
(86)(338) = (V2)(303)
New volume of gas = 95.93 ml (Approx)
giving brainly if detailed and correct
how does fluids affect the friction between two surfaces?
Answers
Answer:
During lubrication, a viscous fluid acts as a layer between two sliding surfaces and reduces the friction between them.
Explanation:
Please show how you solved :)
What is oxygen solubility at 10m depth below sea level, 25 deg
C, 30 g/L salinity?
Answers
The solubility of oxygen at 10m depth below sea level, 25 degrees Celsius, and 30 g/L salinity is approximately 6.59 mg/L.
To calculate the solubility of oxygen at a specific depth below sea level, temperature, and salinity, we can refer to the oxygen solubility tables. The solubility of oxygen can vary depending on these factors.
1. Begin by identifying the given parameters:
- Depth: 10m below sea level
- Temperature: 25 degrees Celsius
- Salinity: 30 g/L
2. Use the given parameters to locate the corresponding values in the oxygen solubility table.
3. The solubility of oxygen at a depth of 10m below sea level, 25 degrees Celsius, and 30 g/L salinity is typically around 6.59 mg/L.
Therefore, the solubility of oxygen at 10m depth below sea level, 25 degrees Celsius, and 30 g/L salinity is approximately 6.59 mg/L.
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The oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity is approximately 1538 mol/L.
To calculate the oxygen solubility at a specific depth below sea level, temperature, and salinity, we can use the solubility formula.
The solubility of a gas decreases with increasing temperature and salinity, and increases with increasing pressure.
Here's how you can calculate the oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity:
1. Determine the pressure at 10m depth below sea level: -
The pressure at sea level is approximately 1 atmosphere (atm).
The pressure increases by approximately 1 atm for every 10 meters of depth.
Therefore, at 10m depth, the pressure is approximately 2 atm.
2. Convert the temperature to Kelvin: -
To convert from Celsius to Kelvin, add 273 to the temperature.
25°C + 273 = 298 K.
3. Use the solubility formula:
The solubility of oxygen in water can be calculated using Henry's law:
S = k * P * C.
S is the solubility of oxygen in moles per liter (mol/L).
k is the Henry's law constant for oxygen in water at a specific temperature and salinity.
P is the partial pressure of oxygen in atmospheres (atm).
C is the concentration of oxygen in moles per liter (mol/L).
4. Look up the Henry's law constant for oxygen at 25°C and 30 g/L salinity:
The Henry's law constant for oxygen at 25°C and 30 g/L salinity is approximately 769 L*atm/mol.
5. Calculate the solubility:
S = (769 L*atm/mol) * (2 atm) * (1 mol/L). - S ≈ 1538 mol/L.
Therefore, the oxygen solubility at 10m depth below sea level, 25°C, and 30 g/L salinity is approximately 1538 mol/L.
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Based on the Hertzprung-Russell diagram, which statement is true? OA. Main sequence stars with low temperatures tend to have low luminosity. B. Supergiants tend to have high luminosity and high temperatures. OC. Giants tend to be the stars with the highest luminosity. D. Main sequence stars with high temperatures tend to have low luminosity.
Answers
Main sequence stars with low temperatures tend to have low luminosity is based on Hertzprung-Russell diagram
What is the Hertzsprung-Russell diagram's main sequence?The bright, hot stars in the image's upper left are the main sequence group, which stretches roughly diagonally to the lower right (dim and cool). In the bottom left are white dwarfs, which are small, faint, and hot. In the top right are giant and supergiant stars, which are big, bright, and cool.
What is the main sequence star H-R diagram trend?Main sequence stars have a wide range of effective temperatures, but because they are brighter at higher temperatures, they normally follow a band from the bottom right to the top left of the diagram. Inside the cores, hydrogen and helium are fusing together.
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Answer: White dwarfs
Explanation: edge2020
covalent bonding occurs in both molecular and covalentnetwork solids. which of the following statements best explains why these two kinds of solids differ so greatly in their hardness and melting points? (a) the molecules in molecular solids have stronger covalent bonding than covalent-network solids do. (b) the molecules in molecular solids are held together by weak intermolecular interactions. (c) the atoms in covalent-network solids are more polarizable than those in molecular solids. (d) molecular solids are denser than covalent-network solids.
Answers
Both molecular and covalent network solids exhibit covalent bonding. Weak intermolecular interactions keep the molecules in molecular solids together.
Explain the covalent bond.When two atoms share an electron pair, an interatomic interaction known as a covalent bond is formed. The binding is brought about by the electrical attraction of their nuclei to the same electrons. A covalent bond is formed when the combined energy of the bonded atoms is lower than the energy of the unbonded atoms.
How do hydrogen atoms form covalent connections with one another?The identical electron pair of the covalent connection pulls the two hydrogen atoms in. The bond is shown as either a solid line or two "dots." Every hydrogen atom acquires an electron arrangement resembling that of helium. The bond length is the separation between atomic nuclei at equilibrium.
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give me an atom with boron characteristics
Answers
Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.
boron into the air, soil, and water during weathering, boron occurs naturally in the environment. In very small quantities, it may also be present in groundwater.
Through the production of glass, the burning of coal, the melting of copper, and the use of agricultural fertilizers, humans add boron to the environment. Human-added boron concentrations are lower than boron concentrations that occur naturally as a result of weathering.
Although it is unlikely that someone may be exposed to borate dust at work, it is possible to be exposed to borate through the air and drinking water. Consumer goods like laundry detergent and cosmetics might expose you to boron.
Thus Elements of boron are not found in nature. It is mixed with borates, kernite, ulexite, colemanite, borax, and boric acid. Boric acids are occasionally present in vulcanic spring fluids.
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during chemiosmosis in aerobic respiration, protons are pumped __________.
Answers
Electrons are passed through a series of redox reactions, and each transfer causes protons to be pumped across the membrane. This creates a concentration gradient, which is used to power ATP synthesis through the process of chemiosmosis.
During chemiosmosis in aerobic respiration, protons are pumped across the inner mitochondrial membrane from the matrix to the intermembrane space.
Aerobic respiration is a process of producing energy that involves the complete breakdown of glucose in the presence of oxygen. It is a crucial metabolic pathway that is present in all higher organisms, including humans.Chemiosmosis is the process in which a transmembrane electrochemical gradient drives ATP synthesis. It is an important part of cellular respiration and oxidative phosphorylation.
During the process of oxidative phosphorylation, protons are pumped across the inner mitochondrial membrane, which creates a proton gradient that powers the synthesis of ATP. In aerobic respiration, the electron transport chain (ETC) is the primary mechanism that generates the proton gradient.
Electrons are passed through a series of redox reactions, and each transfer causes protons to be pumped across the membrane. This creates a concentration gradient, which is used to power ATP synthesis through the process of chemiosmosis.
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Calculate the volume of 100. grams of oxygen gas (O₂) at 25.0°C and a pressure of 1.25 atm.
Answers
Ideal gas law states
PV = n(RT)V is volume (L), P is pressure (atm), R is universal gas constant: 0.0821 L·atm/mol· K, n is number of moles, T is temperature in Kelvin
Here given:
\(\blacksquare\) mass of O₂ : 100 gram
\(\blacksquare\) moles: mass/molar mass = 100/32 = 3.125 moles
\(\blacksquare\) 25.0 °C = (25+273.15) = 298.15 K
\(\blacksquare\) pressure: 1.25 atm
Volume:
\(\boxed{\sf V=\dfrac{nRT}{P}}\)
\(\Rightarrow \sf V=\dfrac{(3.125 \ x \ 0.0821 \ x \ 298.15 )}{1.25}\)
\(\Rightarrow \sf V=61.195 \ L\)
\(\Rightarrow \sf V=61.2 \ L \ \ \ (rounded \ to \ nearest \ tenth)\)
Additional Explanation:
Volume can be counted in multiple units.In Liters: 61.2 Liters
In cubic meter: 0.061163 m³
In cubic centimeter: 61,163.5 cm³
what is the driving force for the movement of earths plates?
Answers
The energy source for plate tectonics is Earth's internal heat while the forces moving the plates are the “ridge push” and “slab pull” gravity forces.
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