Answers
Answer:
The Moon has a diameter of 2,159 miles (3,476 kilometers) and is about one-quarter the size of Earth. The Moon weighs about 80 times less than Earth.
Explanation:
Related Questions
Define kinetic energy. A) energy associated with the temperature of an object B) energy associated with the motion of an object C) energy associated with the force of an object D) energy associated with the gravity of an object E) energy associated with the position or composition of an object 2) Determine the density of an object that has a mass of 1498 g and displaces 12.1 mL of water when placed in a graduated cylinder. A) 8.08 g/mL B) 1.38 g/mL C) 12.4 g/mL D) 18.1 g/mL E) 11.4 g/mL 3) How many significant figures are in the measurement, 20.300 m?! A)3 B) 4 C) 5 D) 1 E)2 4) What does "X" represent in the following symbol? 80 358 A) mercury B) chlorine C) scandium D) bromine E) selenium 5) Write the formula for copper (II) sulfate pentahydrate. A) Cu2SO3 H5 B) Cu2S'H20 C) CuS 5H20 D) (CuSO4)5 E) CuSO4'5H20
Answers
1. B, the energy associated with the motion of an object
2. C, 12.4 g/mL
3. C, 5
1) B) Kinetic energy is energy associated with the motion of an object.
2) B) Density equals mass divided by volume: 1.38 g/mL
3) C) There are 5 significant figures in 20.300
4) A) 80 is the atomic number for mercury on the periodic table.
5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O
So in summary:
• Kinetic energy is the energy of a moving object due to its motion.
• Density is calculated by dividing an object's mass by its volume.
• Significant figures refer to the known precision of a measurement based on the digits reported.
• Atomic symbols represent elements on the periodic table.
• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.
Because they have an extended structure, elements that are ? tend to be in the ? state at room temperature
Answers
Answer:
metal,middle of the periodic table,solid
Explanation:
Because they have an extended structure, elements that are metal tend to be in the middle of the periodic table state at room temperature as solid
Because they have an extended structure, elements that are metal, tend to be in the middle of the periodic table, and stay solid state at room temperature.
What are metals?Metals are those elements of the periodic table which are malleable soft and ductile the full stop, they are very reactive because they have valence electrons in their outermost shells. They are present in the middle of the periodic table.
Some metals are Aluminum, magnesium, titanium iron zinc, bronze, etc. There are 92 metals are present in the periodic table. Metals are useful for making many things such as jewelry, wires, foil papers, and gates. Steel is the most useful metal in the world.
Thus, metal elements tend to be in the middle of the periodic table and maintain their solid state at ambient temperature because of their elongated structure.
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Estimate the ethalpy change of the reaction H-H+Cl-Cl
Answers
Answer:
To estimate the enthalpy change of the reaction H-H+Cl-Cl, we need to know the enthalpies of bond dissociation of H-H and Cl-Cl, as well as the bond dissociation energy of H-Cl.
The bond dissociation energy is defined as the energy required to break a bond homolytically (i.e., each atom retains one electron from the bond). Using experimental or theoretical data, we can estimate the bond dissociation energy for each bond.
The bond dissociation energy for H-H is around 436 kJ/mol, while that for Cl-Cl is around 240 kJ/mol. The bond dissociation energy for H-Cl is around 431 kJ/mol.
Therefore, the estimated enthalpy change of the reaction H-H+Cl-Cl can be approximated as follows:
ΔH ≈ (2 × 436 kJ/mol) + (2 × 240 kJ/mol) - (4 × 431 kJ/mol)
≈ -240 kJ/mol
This estimation suggests that the reaction is exothermic, with a release of about 240 kJ/mol of energy. However, it's important to note that this is only an estimation and the actual enthalpy change of the reaction may differ depending on the experimental conditions and the specific method used to determine the bond dissociation energies.
the action of the sodium-potassium pump is an example of passive transport. true or false
Answers
False, the action of the sodium-potassium pump is an example of active transport, not passive transport.
Active transport refers to the movement of ions or molecules across a cell membrane from an area of lower concentration to an area of higher concentration, which requires the input of energy (usually in the form of ATP).
The sodium-potassium pump actively transports sodium ions out of the cell and potassium ions into the cell, which helps to maintain the concentration gradients of these ions across the cell membrane.
In contrast, passive transport refers to the movement of ions or molecules across a cell membrane from an area of higher concentration to an area of lower concentration, which does not require the input of energy. Examples of passive transport include diffusion, osmosis, and facilitated diffusion.
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after millikan performed his oil drop experiemnt, he concluded that
Answers
After Millikan performed his oil drop experiment, he concluded that the fundamental unit of electric charge is the same for all charged particles and that it is a constant value.
He also determined the value of this unit of charge, which is now known as the elementary charge and is equal to approximately 1.602 x 10^-19 coulombs. Millikan's experiment also confirmed the existence of electrons and provided a way to measure their charge and mass. This experiment was a major breakthrough in understanding the nature of electricity and laid the foundation for many further discoveries in the field of particle physics.
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D
Question 13
An atom has 23 protons and 29 neutrons. Which is the correct chemical symbol for this atom?
52 V
23
52 Cu
23
29 C
29 V
23
Answers
The correct chemical symbol for an atom that has 23 protons and 29 neutrons is 52/23 V. Details about chemical symbol can be found below.
What is chemical symbol?Chemical symbol is the 1- to 3-letter international code for a chemical element.
The chemical symbol of an element shows the atomic mass and mass number of the element.
The mass number of an element is the sum of the number of protons and neutrons. In this case, the mass number of the element is 23 + 29 = 52
Therefore, the correct chemical symbol for an atom that has 23 protons and 29 neutrons is 52/23 V.
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All of the following are qualitative tests that are often used to identify unknown ionic compounds except __________
Answers
All of the following are qualitative tests that are often used to identify unknown ionic compounds except titration.
Qualitative tests are conducted to determine the presence or absence of certain ions or compounds in a sample based on their characteristic reactions. Common qualitative tests include flame tests, precipitation reactions, color changes, and gas evolution tests.
Titration, on the other hand, is a quantitative technique used to determine the concentration of a specific substance in a solution by reacting it with a standardized solution of another substance. It is not typically used as a qualitative test for identifying unknown ionic compounds.
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3. Calculate the concentration in g/dm3 of solution of NaOH containing 0.25 mole in 1dm3
Answers
The concentration of the NaOH solution is 10.00 g/dm³.
To calculate the concentration in g/dm³ of a solution of NaOH containing 0.25 moles in 1 dm³, we need to know the molar mass of NaOH.
The molar mass of NaOH is calculated as follows:
Na (Sodium) = 22.99 g/mol
O (Oxygen) = 16.00 g/mol
H (Hydrogen) = 1.01 g/mol
Molar mass of NaOH = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol = 40.00 g/mol
Now, we can calculate the concentration (C) using the formula:
C = (moles of solute) / (volume of solution in dm³)
C = 0.25 moles / 1 dm³
C = 0.25 mol/dm³
To convert moles to grams, we can multiply the molar mass by the number of moles:
Concentration in g/dm³ = (0.25 mol/dm³) * (40.00 g/mol)
Concentration in g/dm³ = 10.00 g/dm³
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Water circulates through Earth's water cycle by changing its _____.
A. state
B. acidity
C. turbidity
D. composition
PLsss I need answers T-T
Answers
The answer would thus be A.
Select the curve that is produced by adding hydrochloric acid to 25 cm3 of sodium hydroxide.A,B,C or D
Answers
B
The sodium hydroxide (NaOH) solution is a basic solution, so the pH of that solution should be close to 14
then when adding hydrochloric acid (HCl) we start to neutralice the solution, meaning the pH must sift slowly to lower pH.
Assuming both solutions have similar concentration the pH shall shift form basic (above 7) to acid pH (below 7). Until now both B and D images agreed with the explanation given. To chose between them we need to remember that HCl is a very strong acid, which means that in solution will get to very acid solutions (very low pH values) which leaves only B as possible answer
what is the mass of 3.01x10^24 water molecules?
Answers
Answer:The mass of a single water molecule can be calculated using its molecular formula, H2O. The molecular weight of water is 18.015 g/mol.If we have 3.01 x 10^24 water molecules, the total mass can be calculated as follows:Mass = Number of water molecules * Molecular weight of waterMass = 3.01 x 10^24 * 18.015 g/molMass = 5.45 x 10^25 gSo, the mass of 3.01 x 10^24 water molecules is approximately 5.45 x 10^25 grams.
write a balanced chemical equation of decomposition reaction which is carried out by catalyst
Answers
I HOPE IT WILL HELP YOU.
Thank you.
^ - ^
A decomposition reaction is a reaction in which the compound is broken up into its constituents.
A decomposition reaction is a reaction in which the compound is broken up into its constituents. When the decomposition is brought about by a catalyst, it is called catalytic decomposition.
Let us look at the catalytic decomposition of the compound potassium trioxochlorate V. in the presence of the catalysts manganese dioxide. The reaction occurs as follows;
2KClO3 -----> 2KCl + 3O2
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To what volume should 1 l of a solution of a weak acid ha be diluted to reduce the [h ] to one-half of that in the original solution?
Answers
To reduce the hydrogen ion concentration, [H+], to half that of the original solution, the solution should be diluted to 2 L.
Let the solution's initial molarity be 1 M.
Thus,
The diluted solution has a molarity of 1 + 12 = 0.5 M.
We'll calculate the volume of the diluted solution last. This is attainable as follows:
1 L is the size of the stock solution (V1).
Stock solution molarity (M1) = 1 M
Diluted solution molarity (M2) = 0.5 M
M1V1 = M2V2 = Volume of diluted solution (V2)
1 × 1 = 0.5 × V₂
1 = 0.5 × V₂
Add 0.5 to both sides.
V₂ = 1 / 0.5
V₂ = 2 L
In order to lower the concentration of the hydrogen ion, [H+], to half that of the original solution, the solution should be diluted to 2 L.
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Explain the difference between potential energy and kinetic energy.
Sentence Starters
"Potential Energy is. . "
"Kinetic Energy is. . "
"The difference between potential energy and kinetic energy is. . ."
Answers
Answer:
Potential energy is the stored energy in an object or thing, while kinetic energy is the energy which an object contains because of a particular motion.
Explanation:
Potential energy is energy that is stored for example a wind up toy, it has energy but in order for you to get kinetic energy, it has to move. So kinetic energy is moving energy.
The difference is that potential is stored and kinetic is moving energy.
When a gas is compressed at constant temperature.
A.The speed of the molecules increase
B.The collision between the molecules increases.
C.The speed of the molecules decrease
D.The collision between the molecules decreases.
Answers
The H+ concentration at pH 6.8 is approximately 3.981 times greater than at pH 7.4, which is slightly less than 4. The given answer choices do not match this value exactly. Option C, 4, represents a fourfold difference, which is the closest approximation. However, it is important to note that the actual ratio is slightly less than 4.
The logarithmic nature of the pH scale means that even small differences in pH values can correspond to significant differences in H+ concentrations. A change of 1 pH unit represents a tenfold difference in H+ concentration, so a difference of 0.6 pH units corresponds to a value between 3 and 4. Therefore, option C, 4, provides the closest approximation to the H+ concentration ratio at pH 6.8 compared to pH 7.4.
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Please help!!
It’s due today
Answers
Answer:
There is nothing with data to help us complete this chart
THIS IS BAD. THIS IS REALLY BAD
Under what conditions of temperature and pressure is a gas most soluble in water?
Answers
Answer:
A gas is most soluble in water under conditions of high pressure, and low temperature.
You may assume the following combustion event locations when analyzing the figures: \begin{tabular}{|l|c|c|} \hline & Design 1 & Design 2 \\ \hline Spurk Crask Angle & −10 deg & −20 deg \\ \hline 10\% MFB Crank Angle & 0 deg & −5 deg \\ \hline 500 MFB Crank Angle & 10 deg & 10 deg \\ \hline 904 MFB Crank Angle & 25 deg & 30 deg \\ \hline \end{tabular} Note that the data series plotted in c) through f) begin at the spark timing. Please compare the two engines at part load unless told otherwise. For (b) through ( g), a complete discussion will include competing factors that affect the primary and secondary parameters of each process, including those that make an event more or less likely, or make a characteristic increase or decrease for each engine design. (a) Construct a table comparing the important parameters of the two designs. At a minimum, the table should highlight the differences in the compression ratio, Φ,EGR level, intake
Answers
A table comparing the important parameters of the two engine designs is shown below:ParametersDesign 1Design 2Compression Ratio 18:118:1Φ (Equivalence Ratio)0.75 (Richer)0.65 (Leaner)EGR Level 10%15%Intake Temperature 80°C100°C Intake Pressure 1 bar0.5 bar Intake Valve Closing −15 deg BTDC−25 deg BTDC.
The compression ratio is the ratio of the volume of the combustion chamber from its largest capacity to its smallest capacity. The compression ratio in Design 1 is 18:1, while in Design 2, it is 18:1. The higher compression ratio is seen in Design 1, which will lead to a higher engine efficiency since more fuel energy is converted into useful work.
The Φ (equivalence ratio) is the ratio of the actual air/fuel ratio to the stoichiometric air/fuel ratio. A Φ value of 1.0 indicates a stoichiometric mixture, whereas values less than 1.0 indicate a lean mixture and values greater than 1.0 indicate a rich mixture. The Equivalence ratio in Design 1 is 0.75, which means it is running rich, while in Design 2, it is 0.65, which means it is running lean.
The design 2 engine has a higher Φ (equivalence ratio) level, which may lead to lower NOx emissions due to lean-burn combustion.The EGR (Exhaust Gas Recirculation) level in Design 1 is 10%, whereas in Design 2, it is 15%. The EGR level in Design 2 is higher than that in Design 1, which can help to reduce NOx emissions by lowering the temperature of combustion.
Intake temperature is 80°C in Design 1, whereas in Design 2, it is 100°C. The higher intake temperature in Design 2 means that the engine will have a higher thermal efficiency due to the increased Carnot efficiency.Intake pressure is 1 bar in Design 1, while in Design 2, it is 0.5 bar. The higher intake pressure in Design 1 results in more air being compressed into the combustion chamber, allowing for more fuel to be burned and greater efficiency.
Intake Valve Closing (IVC) is −15 deg BTDC in Design 1 and −25 deg BTDC in Design 2. The IVC timing is responsible for trapping the charge in the combustion chamber and influencing the engine's breathing. The lower IVC timing in Design 2 provides less resistance to flow, resulting in greater volumetric efficiency.
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Can someone do this for me? Pleaseeeee I’m very busy.
The directions tell you what to do.
Answers
Answer:
in number 7 its Gas because the molecules are afloat and/or moving rapidly.
Explanation:
things that happened to the organisms I tracked: (example: was eaten by other organisms)
Answers
Reproduced, transferred their genes to progeny, died from natural causes, fell ill or contracted a disease, became prey for a predator or were devoured by a scavenger, or moved to a new area.
What kind of non-living entity might be present in an ecosystem?Non-living things include items like rocks, water, the atmosphere, the climate, and natural occurrences like earthquakes and rockfalls. One of the qualities that characterises living beings is their capacity for reproduction.
What are five non-living examples?Its definition includes glass, the sun, water, sand, and rock as non-living objects. They show absolutely no signs of life. Some people define a non-living object as anything that once belonged to a live entity.
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is how much a material opposes electric current.
*
insulator
conductor
resistance
short circuit
Answers
Answer:
Resistance
Explanation:
Resistance is the measure of the opposition of current in a circuit.
Excess stomach acid is often treated with milk of magnesia, Mg(OH)2 or a similar substance. We would expect the pH of milk of magnesia to be approximately
Responses
A 7.7.
B 10.5.10.5.
C 14.14.
D 4.
Answers
The pH of milk of magnesia (Mg(OH)2) is approximately 10.5. Therefore, the correct answer is B.
What is Milk of Magnesia?
Milk of magnesia is a liquid suspension of magnesium hydroxide, which is an inorganic compound with the chemical formula Mg(OH)2. It is commonly used as an antacid to neutralize stomach acid and relieve indigestion, heartburn, and other gastrointestinal symptoms. Magnesium hydroxide works by reacting with the hydrochloric acid in the stomach to form magnesium chloride and water, which raises the pH of the stomach and reduces the acidity. Milk of magnesia can also be used as a laxative to relieve constipation, as it helps to draw water into the colon and soften the stool.
Its pH can be calculated based on the dissociation of the magnesium hydroxide in water:
Mg(OH)2 + H2O ⇌ Mg2+ + 2OH-
The hydroxide ion concentration, [OH-], is related to the pH by the equation:
pH = 14 - pOH
where pOH = -log[OH-].
The dissociation constant (Kw) of water is 1.0 x 10^-14 at 25°C, and the concentration of the hydroxide ions in milk of magnesia is dependent on the solubility of magnesium hydroxide in water.
At 25°C, the solubility product (Ksp) of Mg(OH)2 is 1.8 x 10^-11. The concentration of hydroxide ions in milk of magnesia can be calculated using the Ksp:
Ksp = [Mg2+][OH-]^2
Since magnesium hydroxide is a weak base, the concentration of hydroxide ions will be less than the concentration of magnesium ions in the solution.
Therefore, the pH of milk of magnesia will be greater than 7, and is typically around 10.5.
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pls help me
What is the mass in grams of 2.64 mol of sulfur dioxide, SO2?
Answers
Answer: The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles SO2, or 64.0638 grams.
Hope it helps.
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _________________ volume and _________________ shape. With each passing minute, _________________ is added to the substance. This causes the molecules of the substance to _________________ more rapidly which we detect by a ________________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ________________. At point C, the substance is completely _______________ or in a _______________ state. Material in this phase has _________________ volume and ________________ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a __________________ to a _________________. This heat energy is called the latent heat of fusion. (An interesting fact.)
Between 9 and 13 minutes, the added energy increases the ____________________ of the substance. During the time from point D to point E, the liquid is ____________________. By point E, the substance is completely in the ________________ phase. Material in this phase has __________________ volume and ___________________ shape. The energy put to the substance between minutes 13 and 18 converted the substance from a _______________ to a _______________ state. This heat energy is called the latent heat of vaporization. (An interesting fact.) Beyond point E, the substance is still in the ___________________ phase, but the molecules are moving _____________________ as indicated by the increasing temperature.
Substance
Melting point
Boiling point
Bolognium
20 °C
100 °C
Unobtainium
40 °C
140 °C
Foosium
70 °C
140 °C
Which of these three substances was likely used in this phase change experiment?
Answers
Answer:
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _____fixed____________ volume and ______________fixed___ shape. With each passing minute, ______________heat___ is added to the substance. This causes the molecules of the substance to _____collide____________ more rapidly which we detect by a ______temperature__________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ______melt__________. At point C, the substance is completely ______liquid_________ or in a _______________ state. Material in this phase has _______fixed__________ volume and ______no definite______ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ________solid__________ to a __________liquid_______. This heat energy is called the latent heat of fusion. (An interesting fact.)
Answer:
At point A, the beginning of observations, the substance exists in a solid state. Material in this phase has _____fixed____________ volume and ______________fixed___ shape. With each passing minute, ______________heat___ is added to the substance. This causes the molecules of the substance to _____collide____________ more rapidly which we detect by a ______temperature__________ rise in the substance. At point B, the temperature of the substance is __________°C. The solid begins to ______melt__________. At point C, the substance is completely ______liquid_________ or in a _______________ state. Material in this phase has _______fixed__________ volume and ______no definite______ shape. The energy put to the substance between minutes 5 and 9 was used to convert the substance from a ________solid__________ to a __________liquid_______. This heat energy is called the latent heat of fusion. (An interesting fact.)
Explanation:
Need answer ASAP!!
Which of the following elements has the greatest atomic radius? *
A) Mg
B) Sr
C) Ca
D) Ba
Answers
6.
Which of the following measurements has one significant figure?
a. 506 mL
b. 60.46 mL
c. 0.0037 mL
d. 0.04 mL
Answers
What is the number of protons, neutrons, and electrons in the following isotopes?
Answers
Answer:
SR: no. of protons=38no. of neutron=51
2. Cr: no. of protons= 24
no. of neutron=28
3. S: number of protons=16
number of neutrons =16
4. BR : number of proton=35
number of neutron =46
Explanation:
In the given questions;
the numerator is atomic mass and in denominator there is atomic number.
Sunlight shining through a clear window hits Jeremy's face while he does his homework. He uses a large wooden block to cover the
window. What do the wooden block and the clear window demonstrate?
A)
Visible light can be transmitted only through certain materials
B)
Visible light can be completely absorbed by all materials.
C)
Visible light can be transmitted through all materials.
D)
Visible light can be completely reflected by all materials
Answers
Answer:
A.Visible light can be transmitted only threw certain materials
Explanation:
Because I had this question on study island and I got it right lol
Answer:
A
Explanation:
Visible light can be transmitted only through certain materials
This is correct I just did the problem
What are two characteristics of the rock found 3 mya?
Answers
To solve this we must be knowing each and every concept related to rock and its characteristics. Therefore, the two characteristics of the rock can be given as below.
What is rock?The word rock relates to the material's bulk volume, which includes the grain or crystals in addition to the enclosed vacuum space.
The two characteristics of the rock are:
Some minerals exhibit color features related to mineral composition and atom arrangement: for example, magnetite is black, chlorite is green, and pyrite is brassy yellow.
The capacity of a mineral to resist scratching is used to estimate its hardness, which is generally determined on fresh material. When a mineral is scraped with a knife, it softens. If a knife cannot scratch it, the two have equivalent hardness or even the mineral is harder.
Therefore, the two characteristics of the rock can be given as above.
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How can these predictable winds, which scientists call "prevailing winds", help us predict whether a place will get precipitation?
Answers
Answer:
The direction of prevailing winds determines which type of air mass generally moves over an area. For illustration, a west wind might bring warm wettish air from over an ocean. An east wind might bring cold dry air from over a mountain range. Which wind prevails has a big effect on the climate
Prevailing winds are the result of atmospheric rotation cells. They impact the climate of a region.
Rising and sinking air can impact the rush of a region.
Atmospheric rotation cells produce the general climate of a region.
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