Answer:
skill
Explanation:
Answer: The more air a fish swim bladder contains, the higher the fish will suspend or float in the war.
Explanation:
What are the 4 parts of an atom, location and charge
Answer:
Electron,
Neutron,
Proton,
& the nucleus
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!
An unknown noble gas has a density of 5.84 g dm-3 at STP. Calculate its molar mass, and so identify the gas.
Molar mass
Identify
The noble gas is Xenon and its molar mass is 131 g/mol.
What is the molar mass of the noble gas?The molar mass of the noble gas is determined as follows;
Let molar mass of unknown gas be M, and mass of gas be m
Density of the noble gas, ρ = 5.8 g/dm³
density = m/V
At STP;
temperature, T = 273.15 Kpressure, P = 1 atmmolar gas constant, R = 0.0821 L.atmK⁻¹mol⁻¹From ideal gas equation:
PV = nRT
where n = m/M
PV = mRT/M
M = mRT/PV
M = 0.0821 * 273.15 * 5.84/1
Molar mass of the noble gas = 131 g/mol
The noble gas is Xenon which has molar mass approximately equal to 131 g/mol.
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Which molecule is more polar, RCH2COCH2R or RCH2(OH)R?
The answer would be RCH2COCH2R is more polar than RCH2(OH)R
The formic acid ( RCH2COCH2R ) is more polar than Pyridinium Chlorochromate (PCC) (RCH2(OH)R) because formic acid is from aldehyde group and is a reagent from a carbonyl group and PCC is react to form carbonyl group it's also an reagent which reacts in oxidation of alcohols.
The polarity is more which is a carbonyl compound as their electrons are loosely prepared. And also the polarity of formic acid is 6.0.
Hence, the formic acid (RCH2COCH2R) is more polar than Pyridinium Chlorochromate (RCH2(OH)R) (PCC).
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Convert 0.00200 g into Mg and answer in scientific notation:
Answer: [tex]2.00x10^{2}[/tex]
Explanation: 1 gram is equal to 1000 Milligrams so
[tex]0.00200g=\frac{1000mg}{1g}[/tex]
Since you go straight across its just multiplication so 0.00200x1000=200mg
To answer it in scientific notation it should just be [tex]2.00x10^{2}[/tex] mg
When you were young you may have had your own theory about why plants are green. Then, as you learned more, you kept ideas that were correct, but replaced ideas that were incorrect. Atomic theory also changed as scientists improved their understanding. What incorrect idea in Bohr’s understanding of the atom was replaced in later theories?
Atoms can not be divided is the incorrect idea in Bohr’s understanding of the atom.
Bohr believed that electrons circled the nucleus in orbits. According to current atomic theory, electrons don't follow predetermined routes.
Bohr believed that electrons traveled in circular paths around the nucleus, but current theory suggests that the structure of atomic electrons is more to 3D standing waves.
Bohr improved on Rutherford's atomic model. The majority of the atom's mass is concentrated in its nucleus, which we now refer to as the center of the atom, and electrons surround the positive mass in a manner to a cloud. Bohr's use of the quantification energy to explain the model was his most important contribution. According to his theories, electrons circling the nucleus have quantized potential and kinetic energies.
The Heisenberg Uncertainty Principle is first violated by the Bohr model because it assumes that electrons have a known orbit and radius. The Bohr Model is less effective at drawing diagrams of larger atoms and gives an incorrect value for the ground state orbital angular momentum.
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Please help! I don’t know what 4 and 5 is
A carpet sells for $24.99 per square yard. What is the price of the carpet per square meter? How much will it cost to carpet an area of 1365 ft2?
The carpet sells for $24.99 per square yard, so the cost of the carpet per square meter area is $40,799.85.
What is the carpet area?The carpet area is that space in your home, which can be used for laying a carpet. It includes the thickness of the internal wall, but excludes the balcony or terrace.
Given that the price of the carpet is $24.99 per square yard, in the first step to convert the square yard to a square meter. 1 square yard = 0.836 square meters now in the second step, calculate the cost per square meter based on the relation in the above step we can write,0.836 square meters of carpet costs $24.99.
Therefore, the cost of 1 square meter of the carpet would cost of the carpet multiplied by one square meter and then divided by the unit in one square yard. From this, the price of the carpet per square meter is known. Price of the carpet per square meter = $24.99 * 1 sq meter/0.836 sq meter price of the carpet per square meter= $29.89. Now we have to find the Cost of the carpet area.
Cost of carpet area = $24.99* 1365 = $40,799.85.
Thus, the Cost of carpet area is $40,799.85.
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The density of silver is 10.49 g/cm³. What is the mass of a piece of silver with a volume of 4.83 cm³?
Density is a physical property that relates the mass of a substance with the volume occupied by the mass of the substance. The density of the substance can be used to examine the purity of the substance.
What new combined branch of study was developed from the
study of matter within living systems?
According to the research, the correct option is Biochemistry. It is a new combined branch of study that was developed from the study of matter within living systems.
What is Biochemistry?It is an integrating science or scientific discipline that studies at the molecular level the characteristics and functions of the chemical components of living beings.
In this sense, it is responsible for the study of substances such as proteins, lipids, carbohydrates that are present in living organisms and the fundamental chemical reactions for vital processes.
Therefore, we can conclude that according to the research, the correct option is Biochemistry. It is a new combined branch of study that was developed from the study of matter within living systems.
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Three girls raced their model cars down a
40-meter track. Their times are in the table.
What was the average speed at which the
cars rolled down the track?
The average speed at which the cars rolled down the track 4.28 m/s
Average Speed is defined as Total Distance Traveled ÷ Total Time Taken . SI unit of average speed is meter per second ( m/s).
Average Speed = total distance traveled ÷ total time taken
we have , jessica's car travelled 40 m in 10 sec
kristi's car travelled 40 m in 20 sec
laticia's car travelled 40m in 8 sec
Average Speed = total distance traveled ÷ total time taken
so, = 40+40+40 ÷ 10+20+8
= 120÷28
= 4.28 m/s
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Chemistry
zinc tetraoxosulphate vi solution was electrolyzed in such a way that is 0.5A flowed for 32min 10 sec, deposited 0.325g of zinc at the Cathode · Calculate 1. The number of moles of zinc deposited (2) The number of Coulombs of electricity required to deposit I mole of zine (3) The charge on a zinc ion (IF = 96500C, zn=65)
the number of moles of zinc is 0.00492, and coulomb's of charge = 965coulumnbs and charge of zinc is +2
Zinc mass divided by zinc molar mass equals the number of moles of zinc deposited. Moles of zinc deposited in number=0.32/65 ,0.00492 moles of zinc were deposited.
the number of coulombs = I X t so 0.5 X 1930 sec so 965 coulombs.
The charge on zinc ion is +2
In the International System of Units, the unit of electric charge is the coulomb. It is equivalent to the electric charge delivered by a 1 ampere continuous current in 1 second and to 51018/0.801088317 in the current edition of the SI. fundamental charges
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the charge of zinc is +2, there are 0.0049 moles of zinc, and the coulomb's of charge are 965 coulombs.
The number of moles of zinc deposited is equal to zinc mass divided by zinc molar mass. Moles of zinc were deposited in number=0.32/65, amounting to 0.0049 moles.I times time equals 0.5 times 1930 seconds, or 965 coulombs.Zinc ion's charge is +2In the International System of Units, the unit of electric charge is the coulomb.It is equivalent to 51018/0.801 in the most recent edition of the SI, which is the electric charge produced by a 1 amp continuous current in a second.When a direct electric current is passed through an electrolyte, it causes chemical reactions at the electrodes and material degradation. Electrolysis is accomplished using an electrolyte, electrodes, and an external power source.
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The U.S. Environmental Protection Agency (EPA) sets limits on
healthful levels of air pollutants. The maximum level that the EPA
considers safe for lead air pollution is 1.5 μg/m³
By applying Avogadro's constant, the number of lead atoms present in your lungs is equal to 2.49 × 10¹³ atoms of lead.
What is a conversion factor?A conversion factor can be defined as a number that is typically used to convert (change) a number in one (1) set of units to another, either by dividing or multiplying.
Generally speaking, an appropriate conversion factor to an equal value must be used when it is necessary to perform any mathematical conversion.
Conversion:
1.5 μg lead = 1 m³ of air.1 m³ = 1000 Liters (L)1 mole of lead = 207.2 grams of lead.1 gram (g) = 10⁶ microgram (μg).1 mole of lead = 6.022 × 10²³ lead atoms.Next, we would convert the volume of lungs in liters to meter cube (m³):
Volume of lungs = 5.6/1000
Volume of lungs = 5.6 × 10⁻³ m³.
Assuming the whole volume of lungs is filled with air, the number of lead atoms present is given by:
Number of lead atoms = 5.6 × 10⁻³ × 1.5
Number of lead atoms = 8.55 × 10⁻³ μg of lead.
Next, we would convert the mass of lead into moles of lead as follows:
Moles of lead = 8.55 × 10⁻³ × 1/207.2 × 1/10⁶
Moles of lead = 8.55 × 10⁻³/(207.2 × 10⁶)
Moles of lead = 4.13 × 10⁻¹¹ mole of lead.
Finally, we would determine number of lead atoms present by using Avogadro's constant:
Number of lead atoms = 4.13 × 10⁻¹¹ × 6.022 × 10²³
Number of lead atoms = 2.49 × 10¹³ atoms of lead.
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Complete Question:
The U. S. Environmental Protection Agency (EPA) sets limits on healthful levels of air pollutants. The maximum level that the EPA considers safe for lead air pollution is 1.5 μg/m³. If your lungs were filled with air containing this level of lead, how many lead atoms would be in your lungs? (Assume a total lung volume of 5.60 L.)
A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 90.0 mL. The liquid solvent has a mass of 47.3 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is 3.25 g/mL.
The mass of the solid will be 114.7 g.
Density problemThe density of a substance is given as the ratio of its mass and its volume.
Also, a solid will always displace its own volume in a liquid.
Mass of liquid solvent = 47.3 g
Density of liquid solvent = 0.865 g/mL
Recall that: density = mass/volume
Volume of liquid solvent = mass/density
= 47.3/0.865
= 54.7 mL
Volume of solid + liquid solvent = 90.0 mL
Volume of solid = 90.0 - volume of liquid solvent
= 90.0 - 54.7
= 35.3 mL
Density of solid = 3.25 g/mL
Mass of solid = density x volume
= 3.25 x 35.3
= 114.7 g
The mass of the solid is 114.7 g.
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What is Judy Hopps reception like once she joins the Zootopia police force? Why is this?
How many moles are in 9.27 x 10^22 atoms of silicon
The number of moles are in 9.27 x [tex]10^{22}[/tex] atoms of silicon is 0.153
The number of atoms is given as follows;
Atoms= nxNa
9.27x[tex]10^{22}[/tex]=nx6.022x[tex]10^{23}[/tex]
n=9.27x[tex]10^{22}[/tex]/6.022x[tex]10^{23}[/tex]
n=1.53x[tex]10^{-1}[/tex]
n=0.153
The number of moles n, is 0.153
The International System of Units uses the mole (symbol: mol) as the unit of material quantity. The number of elementary entities of a certain substance are present in an item or sample is determined by the quantity of that material.The mole, symbol mol, is the unit of amount of substance.Mole is a standard scientific unit used to measure large quantities of very small entities such as atoms, molecules, ions, etc.To learn more about mole visit:
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(Trial 1)
Convert mass to moles for both reactants. (round to 2 significant figures.)
2.50 g CuCl equals
moles
0.50 g Al equals
moles
DONE
Answer:
CuCl has 0.025 and Al has 0.018 moles
Answer:
.019 and .0093
Explanation:
The data table below shows the yield of vegetables in a school's garden for three years. The yield is the number of pounds of vegetables harvested. The same number of each type of vegetable was planted every year
The correct option is (d) ,i.e., the acorn squash yield lessen from 2012 to 2013 due to lower temperatures.
To estimate yield of vegetables in a harmonious manner, one can gather 10' of row at several locales in the field. Multiply the average yield( lb) per 10' of row times the following row distance factors to convert the sample of yields of vegetables to lb/A.
The question is incomplete the given questions is a multiple choice question :
The data table shows the yield of vegetables in a garden of the school for 3 years. The yield is the number of pounds of vegetables gathered. The same number of each type of vegetable was planted every time. Which statement is an inference?
a. the onion yield was higher than the beet yield in 2013
b. the butternut squash yield lessened from 2011-2012
c. the spinach yield was 102 pounds in 2011 and 137 pounds in 2012
d. the acorn squash yield lessen from 2012 to 2013 due to lower temperatures
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Which process allows liquid water on the surface to enter the atmosphere?
evaporation
condensation
sublimation
transpiration
(c) Copper reacts with oxygen to produce copper oxide.
63.5 g of copper produces 79.5 g of copper oxide. Mr
Calculate the mass of copper oxide produced when 0.50 g of copper reacts with
oxygen.
Give your answer to 3 significant figures.
The answer would be 0.625 gram.
Copper oxide made from combining Copper and oxygen when copper comes under contact of oxygen it forms copper oxide.
Copper oxide is brownish in color.
Mainly used for nanoparticles or infrared filters and is a weak base.
It is an inorganic compound.
Copper (Cu) + Oxygen (O2) -----------> Copper Oxide (CuO)
If 63.5 gram of Cu produces 79.5 of Copper Oxide
Mass of copper oxide produces when 0.5 Copper react with oxygen = 79.5 g * 0.5 g / 63.5 g
Mass of Copper oxide = 0.625 grams
Hence the mass of Copper Oxide would be 0.625 grams.
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Which of the following atoms has the highest ionization energy?
Aluminum (Al)
Sodium (Na)
Phosphorous (P)
Magnesium (Mg)
The phosphorus atom have has the highest ionization energy .
The ionisation energy of atoms are given as ,
Sodium ( Na ) = 496
Phosphorus ( P ) =1012
Magnesium (Mg ) =738
Aluminium ( Al ) = 578
Since , phosphorus atom have half filled configuration . It is very difficult to remove electrons from atoms having half filled configuration . Hence, it requires more energy .
The ionisation energy measures an element's ability to participate in chemical processes that call for the creation of ions or the donation of electrons. It is often connected to the type of chemical bonds that exist between the components in the compounds they form. See also electron affinity and binding energy.
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Upon being diagnosed with Cirrhosis of the liver, doctors urge patients to limit the amount of salt intake in their diet to help decrease the rate of scarring. During salt intake the blood becomes increasingly (hypertonic, hypotonic) to the interstitial fluid. Due to this osmotic imbalance, the liver cells become (hypertonic, hypotonic) to the interstitial fluid. This causes the liver cells to appear (shriveled, swollen).
Upon being diagnosed with cirrhosis of the liver, doctors urge patients to limit the amount of salt intake in their diet to help decrease the rate of scarring. During salt intake the blood becomes increasingly hypertonic to the interstitial fluid. Due to this osmotic imbalance, the liver cells become hypotonic to the interstitial fluid. This causes the liver cells to appear swollen.
What is cirrhosis?Cirrhosis is a liver injury that is generated by various causes in which the liver begins to form fibrous because scars are generated in it. The lesions occur for different reasons, such as excessive alcohol consumption, and the liver will try to heal itself by forming scars, but as this happens, the cirrhosis worsens and can be fatal.
Therefore, we can confirm that upon being diagnosed with cirrhosis of the liver, doctors urge patients to limit the amount of salt intake in their diet to help decrease the rate of scarring. During salt intake the blood becomes increasingly hypertonic to the interstitial fluid. Due to this osmotic imbalance, the liver cells become hypotonic to the interstitial fluid. This causes the liver cells to appear swollen.
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Which of the following would you expect to form a molecular compound?
Potassium and nitrogen
Sodium and bromine
Hydrogen and sulfur
Iron and oxygen
Answer:
Iron and oxygen
Potassium and nitrogen
which of the following best describes the sum of all forces acting on an object ?
a: net force,which is a vector sum
b: net force,which is a scalar sum
c: acceleration, which is a vector sum
d: gravitational force, which is a vector sum
Answer:
the net force which is a vector sum
Explanation:
The net force is the vector sum of all the forces
That is, the net force is the resultant of all the forces
The vector sum of all the forces is called as the net force. In other words, the net force is the sum of all forces. Thus, option A is correct.
What is the sum of all forces acting on an object?The mass times the acceleration equals the sum of the forces. According to the second law, the acceleration is equal to zero if the object or system is not moving. As a result, the vector forces' sum must be zero.
The net force is the result of the vector sum of all the forces acting on a body. The item is considered to be in equilibrium if the net force is equal to zero.
The process of adding two or more vectors together to create a vector sum is known as vector addition. The so-called parallelogram law lays forth the guidelines for adding two or more vectors together.
By aligning the two vectors and head to tail and drawing the vector from the free tail to the free head, the vector total for the pair and may be calculated.
Therefore, vector sum best describes the sum of all forces acting on an object.
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A gas is in a flexible container (volume can change but no gas can escape) at constant pressure. If 1 liter of gas at 300 K is cooled to 100 K (and assuming that it does not condense to a liquid!), what is the volume (in liters) of the gas at 100 K?
The volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.
How to calculate volume?The volume of a gas can be calculated using the following formula:
V1/T1 = V2/T2
Where;
V1 = initial volumeV2 = final volumeT1 = initial temperatureT2 = final temperatureAccording to this question, a gas is in a flexible container. If 1 liter of gas at 300K is cooled to 100K. The volume of the gas is calculated as follows:
1/300 = V2/100
100 × 1 = 300V2
100 = 300V2
V2 = 100/300
V2 = 0.33L
Therefore, the volume of the gas at 100K If 1 liter of gas at 300 K is cooled to 100K is 0.33L.
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What is the formula for the molecule above? (Periodic table squares are provided below,
if you want them.)
A. H2
B. H2O
C.O2
D. H
Answer:
I believe H2.
Explanation:
It's H2 because there are two electrons on there being share by 2 atoms.
Since Hydrogen can only get a maximum of 2 electrons and no other atoms are present, that is why it's H2.
AgNo3(aq) +KSCN(aq) = KNO3(aq) + AgSCN(s) what is the equilibrium constan
The equilibrium constant is K=[KNO3]/[AgNO3][KSCN]
The equilibrium constant is defined as the ratio of the concentration of products upon reactants.The species present in solid phase are taken as unity.Substituting the values, we getK=[KNO3][AgSCN]/AgNO3][KSCN]K=[KNO3]×1/[AgNO3][KSCN]k=[KNO3]/[AgNO3][KSCN]The ratio of reactant to product amounts that is used to predict chemical behavior is the definition of the equilibrium constant for a chemical process. The rate constants are constant at a certain temperature.The value of a chemical reaction's reaction quotient at chemical equilibrium, a condition that a dynamic chemical system approaches is the equilibrium constant for that reaction when enough time has passed and at which its composition shows no evident tendency to change further.The equilibrium constant is independent of the initial analytical concentrations of the species of the reactant and product in the mixture given a certain set of reaction conditions.As a result, the composition of a system at equilibrium may be calculated from its starting composition using known equilibrium constant values. However, factors affecting the reaction such as temperature, solvent, and ionic strength may all affect the equilibrium constant's value.To learn more about equilibrium constant visit:
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How many moles water contain 1.51x10^24 molecules of water
2.507 moles of water is present in 1.51 x 10^24 molecules of water
The mole is the amount of substance of a system which contains as many elementary entities as there are atoms in 0.012 kilogram of carbon 12
Every mole contain a certain number of atoms which is the Avogadro's number
Avogadro's number states that each mole of every compound contains
6.023x 10^23 atoms of molecules
It is given to us to find out how many moles of water is present in 1.51 x 10^24
The number of moles of water present = 1.51 x 10^24 / 6.023 x 10^23
=2.507 moles
Hence, 2.507 moles of water is present in 1.51 x 10^24 molecules of water
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Which statement about reversible reactions is correct? (1 point)
O The forward and reverse reactions must happen at the same rate.
O They are always at equilibrium.
O They always involve gases.
O They can occur in either direction.
Answer: the last one
Explanation: it is the only one that makes sense \
sorry if its wrong
How many moles of calcium do you have if you measure out 19.13 g of calcium?
Answer:
0.4773 moles Ca
Explanation:
To find the amount of moles, you need to multiply the mass (g) by the atomic mass of calcium. The atomic mass compares the mass of calcium per every one mole. It is important to arrange the ratio in a way that allows for the cancellation of units (grams should be in the denominator). The final answer should have 4 sig figs to match the given value.
Atomic Mass (Ca): 40.078 g/mol
19.13 g Ca 1 mole
------------------- x ------------------- = 0.4773 moles Ca
40.078 g
how many moles of CaCo3 are there in an antacid tablet containing 0.512g CaCo3
The number of mole of CaCO₃ in antacid tablet containing 0.512 g of CaCO₃ is 5.12×10⁻³ mole
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
How to determine the mole of CaCO₃From the question given above, the following data were obtained:
Mass of CaCO₃ = 0.512 gMolar mass of CaCO₃ = 40 + 12 + (3 × 16) = 40 + 12 + 48 = 100 g/mol Mole of CaCO₃ =?The number of mole in 0.512 g of CaCO₃ can be obtained as follow:
Mole = mass / molar mass
Mole of CaCO₃ = 0.512 / 100
Mole of CaCO₃ = 5.12×10⁻³ mole
Thus, 5.12×10⁻³ mole of CaCO₃ is present in the antacid tablet
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