Answers
Answer:
the correct answers are A,D,E, and G
Explanation:
Related Questions
Mass of 1.5 mole electron is
Answers
Mass of 1.5 mole of electron is 0.8229 mg
mass of electron = 9.11 * 10^-31 kg
mass of 1 mole of any substance ( Avagadro number ) = 6.022 * 10^23 /mol
1.5 moles of electron = 1.5 * 6.022 * 10^23 = 9.033 * 10^23 /mol
mass of 1.5 mole of electron = 9.033 * 10^23 * 9.11 * 10^-31
mass of 1.5 mole of electron = 8.229 * 10^-7 kg
mass of 1.5 mole of electron = 8.229 * 10^-4 g
mass of 1.5 mole of electron = 0.8229 mg
Hope it helps.....
Quantity of atoms in .3521 mol in ZrSiO4
Answers
Answer:
look the image
Explanation:
Which equation shows how frequency is related to velocity and wavelength?
Answers
The equation that shows how frequency is related to velocity and wavelength is f = v / λ (Option A)
What is frequency?This is defined as the number of oscillations made in one second. It is expressed as
Frequency (f) = 1 / period (T)
f = 1 / T
Relationships between frequency, wavelength and velocityThe velocity, frequency and wavelength of a wave are related according to the following equation
v = λf
Making f the subject, we have
f = v / λ
Thus, we can conclude that the correct answer to the question is:
f = v / λ (Option A)
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If I add 30mL of water to 125mL of a 0.15M of NaOH solution, what will the molarity of the dilated solution be?
Answers
Answer:
.12 M
Explanation:
.15 M / L * .125 L = .01875 Moles
now add 30 ml for total 155 ml = .155 L
.01875 M / .155 L = .12 M
MATH AND SCIENCE
Out of around 260,000 known species of angiosperms, approximately 195,000 are dicots. what percentage of angio sperms are dicots
Answers
Answer:
Explanation:
Formula
% = (dicots/angiosperms) * 100
Givens
angiosperms (total) = 260000
Dicots = 195000
Solution
% = (195000/260000) * 100
% = 0.75 * 100
Answer: % = 75% are dicots
Learning task 1:compare and contrast mitosis and meiosis by filling up the table below.
Answers
The purpose of both mitosis and meiosis is to increase the number or population of cells in the body.
Compare mitosis and meiosis type of cell divisionMitosis produces two diploid (2n) cells that are identical to the original parent cell whereas meiosis produces four haploid (n) cells that are different from the original parent cell.
Mitosis occurs in somatic cells whereas meiosis occurs in reproductive cells.
So we can conclude that the purpose of both mitosis and meiosis is to increase the number or population of cells in the body.
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PROBLEM SETS: %BY MASS, % BY VOLUME, MOLARITY, MOLALITY (show your solution)
1. What is the molarity of a solution in which 0.850 grams of ammonium nitrate are dissolved in 345 mL of solution?
2. Calculate the molality of a solution of 13.5g of KF dissolved in 250. g of water.
3. Calculate the molality of a solution containing 16.5 g of dissolved naphthalene (C10H8) in 54.3 g benzene (C6H6).
4. What is the mass percent of each component in the mixture formed by adding 12 g of calcium sulfate, 18 g of sodium nitrate, and 25 g of potassium chloride to 500 g of water?
5. A solution is made by dissolving 125 g of sodium chloride in 1.5 kg of water. What is the percent by mass?
6. What is the percent by volume of a solution formed by added 15 L of acetone to 28 L of water?
Answers
The concentration of a substance can be expressed using molarity, molality or percent.
What is concentration?The term concentration has to do with the amount of substance present in solution. Now let us solve the problems individually;
a) Number of moles = 0.850 grams/80 g/mol = 0.011 moles
molarity = 0.011 moles/345 * 10^-3 L = 0.032 M
b) Number of moles = 13.5g /58 g/mol = 0.23 moles
molality = 0.23 moles/250 * 10^-3 Kg = 0.92 m
c) Number of moles = 16.5 g/128 g/mol = 0.13 moles
molality = 0.13 moles/54.3 * 10^-3 Kg =2.39 m
d) Total mass present = 12 g + 18 g + 25 g + 500 g = 555 g
mass percent of calcium sulfate = 12 g/555 g * 100/1 = 2.2 %
mass percent of sodium nitrate = 18 g/ 555 g * 100/1 = 3.2 %
mass percent of potassium chloride = 25 g / 555 g * 100/1 = 4.5%
mass percent of water = 500 g / 555 g * 100/1 =90.1%
e) Total mass present = 125 g + 1500g = 1625 g
Mass percent of NaCl = 125 g/1625 g * 100/1 = 7.7%
f) Total volume of solution = 15 L + 28 L = 43 L
percent by volume of acetone = 15 L/43 L * 100/1 = 34.9%
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Temperature and _____________________ control the phase of a substance. A phase diagram is a graph of pressure versus temperature that shows in which phase a substance exists under different conditions of temperature and pressure. A phase diagram typically has ______ regions, each representing a different phase and three curves that ________________________ each phase.
Answers
2. 3 regions(solid,liquid,gas)
3. Represents
Temperature and pressure control the phase of a substance. A phase diagram is a graph of pressure versus temperature that shows in which phase a substance exists under different conditions of temperature and pressure. A phase diagram typically has three regions, each representing a different phase, and three curves that separate each phase.
In a phase diagram, the three regions correspond to the three common phases of matter: solid, liquid, and gas. The curves that separate each phase are known as phase boundaries or phase transition lines. These curves represent the conditions (specific combinations of pressure and temperature) at which phase transitions occur, such as melting (solid to liquid), boiling (liquid to gas), or sublimation (solid to gas).
Each phase boundary on the phase diagram represents the equilibrium between two phases, and the triple point, where all three phase boundaries intersect, represents the conditions where all three phases coexist in equilibrium.
Phase diagrams are essential tools in understanding the behavior of substances under different temperature and pressure conditions and are used in various fields, including chemistry, physics, and materials science. They provide valuable information about the stability and existence of different phases and the conditions under which phase transitions occur.
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Balance the equation for a half-reaction that occurs in acidic solution. Use e− as the symbol for an electron.
MnO_{4}^{-} -> MnO_{2}
Answers
The balanced half reaction equation is MnO4^- + 4H^+ ------>MnO2 + 2H2O + 3e
What is a redox reaction?The term redox reaction has to do with a reaction in which there is a loss or gain of electrons. In this reaction, one specie accepts electrons while another specie looses electrons.
The balanced half reaction equation in acid is; MnO4^- + 4H^+ ------>MnO2 + 2H2O + 3e
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Which of the following is NOT an example of potential energy?
A. Gravitational pull C. Chemical Bonds
B. Nuclear energy D. Electricity
Answers
Answer:
Answer C
Explanation:
Chemical Bonds
list three differences between liquids and gases
Answers
Answer:
Gas:
- No fixed shape or volume
- Molecules are very loosely packed
- Flows in all the directions
Liquid:
- No fixed shape but has volume
- Molecules are closely packed
- Always flows from higher to lower level
What is the correct way of representing hydrogen gas alone, in a reaction??
Answers
Any seabin limitations
Answers
Answer:
The device can collect up to 1.5 kg (3.3 lbs) of waste per day and holds a total of 20 kg (44 lbs) of waste. To illustrate this more vividly: A Seabin can collect up to 90’000 plastic bags, 37’500 coffee cups or 16’500 PET bottles per year.
Explanation:
Not sure what you mean??
What is the maximum concentration of Ag⁺ that can be added to a 0.00620 M solution of Na₂CO₃ before a precipitate will form? (Ksp for Ag₂CO₃ is 8.10 × 10⁻¹²)
Answers
For the maximum concentration of Ag+ is mathematically given as
x = 3.6×10−5
What is the maximum concentration of Ag⁺ that can be added to a 0.00620 M solution of Na₂CO₃ before a precipitate will form?Generally, the Ksp equation for this reaction is mathematically given as
[tex]K_{sp}=[Ag^+]^2[CO_3^{2-}][/tex]
[CO3^2-]=0.00620M
Ksp =[Ag+}^2 x 0.00620
8.1x10^-12 = x^2 x 0.00620
x = [tex]\sqrt{8.1*10^{-12}/0.00620}[/tex]
x = 3.6×10−5
In conclusion, the maximum concentration of Ag⁺ is
x = 3.6×10−5
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Which of these events leaves small pieces of rocks in new places? (4 points)
a
Deposition
b
Weathering
c
Erosion
d
Oxidation
Answers
this means that it was moved from one place to another and can be transported by ice, water, gravity, or wind.
Answer:
Deposition
Explanation:
Deposition is a process that lays down sediment and changes the shape of the land.
Which reaction represents a nuclear reaction?
CO2+H2O→H2CO3
2Na+Cl2→2NaCl
92238U→90234Th+24He2+
2H2O2→2H2+O2
Answers
92238U→90234Th+24He2 is a Niclear reaction
Nuclear reaction involves Nuclear elements.
It is usually defined as spontaneous emission of electrons.
Uranium 238 is a nuclear element
The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
What is a nuclear reaction?A nuclear reaction is a process whereby two nuclei collide to form one or more nuclides. There are 4 different types of nuclear reaction and they are ;
FissionFusionNuclear decayTransmutationUranium 238 is a nuclear element therefore the reaction involving Uranium 238 is a nuclear reaction.
Hence we can conclude that The reaction that represents a nuclear reaction is : ( C ) 92238U→90234Th+24He2+
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12. A voltaic cell consists of a chromium electrode dipped in a 1.20 M chromium (III) nitrate
solution and a tin electrode dipped in a 0.400 M tin (II) nitrate solution. What is the cell
potential at 298 K?
Answers
For a voltaic cell consisting of chromium, an electrode dipped in a 1.20 M chromium (III) nitrate solution and a tin electrode dipped in a 0.400 M tin (II) nitrate solution, the cell potential at 298 K is mathematically given as
Ecell = 0.577 V
What is the cell potential at 298 K?Generally, the equation for the Oxidation and Reduction is mathematically given as
Cr(s) ------------------ Cr+3(aq) + 3e- ] x 2 ...O
Sn+2(aq) + 2e- ------------ Sn(s) ] x 3 ...R
Reaction
2 Cr(s) + 3 Sn+2(aq) --------------- 2 Cr+3(aq) + 3 Sn(s)
Therefore
Eicell = - 0.14 - ( - 0.74)
Eicell = 0.60
In conclusion
[tex]Ecell= E0cell - \frac{0.0591}{n} * \frac{log[Cr+3]^2}{ [ Sn+2]^3}[/tex]
[tex]Ecell = 0.60 - \frac{0.0591 }{6} \frac{log( 1.20)^2}{ ( 0.200)^3}[/tex]
Ecell = 0.577 V
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A 25.0 g sample of N2 gas, has a volume of 50.0 L and a pressure of 630. mm of Hg. What is the temperature of the gas? Universal Gas Constant, R = 62.4 L.mm Hg/mole.K
Answers
Answer:
565.4 K
Explanation:
Remember PV = nRT
630 * 50 = 25/28 * 62.4 T
T = 565.4 kelvin
Read the passage on the California Zero-Emission Vehicle Program. Should automobile makers be made to adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue?
Answers
Transport media is a significant pollution source by emitting gasses and particles. YES. Automobile makers should adhere to quotas for zero-emission vehicles.
What are the Zero-Emission vehicles?
These are cars, trucks, and buses that mostly run on electricity. The pollution degree caused by these vehicles is highly reduced compared with ordinary vehicles because of the reduction in fuel use and the consequent reduction in gasses and other substances emissions.
There are three types of zero-emission vehicles
Hybrids vehicles that combine gasoline and electricityFully electric vehicles that run entirely on electricityHydrogen cells vehicles that use hydrogen gas to produce electricity
Currently, and for decades, transport media are one of the most significant sources of gasses and other polluting substances emissions that lead to an increase in the greenhouse effect and global warming. Some of them are mentioned in the article -VOCs, nitrogen oxide, carbon monoxide, and dioxide, hydrocarbon-.
These are all primary pollutants suspended in the air that can produce secondary pollutants.
The mentioned pollutants could be significantly reduced by substituting transport media or improving the combustion processes. This last goal could be achieved by using alternative fuels and technologies or by using catalytic converters.
A considerable reduction in pollutant emissions from Zero-Emission Vehicles has already been proven in many countries. So several actions and regulations should be done about it to decrease even more -to near-zero- gasses and other particles emission. And more countries should be involved.
Following this thinking line, the answer is YES. Automobile makers should adhere to quotas of zero-emission vehicles set by states, even if it causes automakers to lose revenue.
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If the length of a string increases 2 times but the mass of the string remains constant, the new density of the string will equal the original density multiplied by what factor?
Answers
If the length of a string increases 2 times but the mass of the string remains constant, the original density will be multiplied by a factor mathematically given as
v=1.414 times
Will the new density of the string equal the original density multiplied by what factor?Generally, the equation for the volume is mathematically given as
v = sqt(TL/m)
Where
density = mass/length
Therefore
[tex]v2/v1 = \sqrt{L2/L1}[/tex]
[tex]v2/v1 = \sqrt{2}[/tex]
In conclusion,v ratio will give us
v=1.414 times
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What is the compound name for this compound structure?
Answers
The compound name for the compound structure given in the question is 2, 3-dimethlypentane
IUPAC nomenclatureThe international union of pure and applied chemistry (IUPAC) has organised a principle by which organic compounds are named. This principle includes:
Identify the functional group Locating the longest continuous carbon chain. This gives the parent name of the compound. Identified the substituent groups attached Give the substituent groups the lowest low count Combine the above to get the nameHow to name the compound The functional group is alkane since it contains only single bonds The longest continuous carbon chain is 5. Thus the parent name is pentane. Two methyl (CH₃) groups are attached The methyl (CH₃) groups are located at carbon 2 and 3The name of the compound is 2, 3-dimethlypentaneLearn more about IUPAC nomenclature:
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what is this difference between a Mm and a mm? which is larger one Mm or one mm
Answers
Megameter. Try not to get them muddled up
because the are very different sizes.
The letter is different
A 100g piece of iron at 150oC is emersed in 268.5 g of water at 20oC. the temperature of both iron and water became 25oC. If the specific heat of iron is 0.449 J/g.K, find the specific heat of water?
Answers
Answer:
cW = 4.2J/g.k
Explanation:
Heat gained = Heat lost
iron(mc∆€) = water(mc∆€)
mi= 100g
ci = 0.449
∆€i= 150-25 = 125
...
mw= 268.5g
cw = ?
∆€w=25-20 = 5
...
100×0.449×125= 268.5×cw×5
5612.5= 1342.5cw
cw = 5612.5/1342.5
cw= 4.18 ~ 4.2J/g.K
Balance the following equation. Fill in the blanks
( ? )NaCl + ( ? ) AgNO3 → ( ? )AgCl + ( ? ) NaNO3
Answers
NaCl+AgNO_3-->AgCl+NaNO_3
on both sides
Na=1Ag=1Cl=1NO_3=1Hence it's balanced already
What is the volume of 1.758 mole of a gas at standard temperature and pressure
Answers
Answer:
39.379 liters
Explanation:
One mole of gas at STP = 22.4 l / mole
22.4 l/mole * 1.758 mole = 39.379 liters
Ni(CO)4 how many moles of oxygen
Answers
What would be the immediate product of neutron absorption by Ag 107
Answers
The immediate product of neutron absorption by Ag-107 is silver atom with a mass of 108, Ag-108.
What is radioactivity?Radioactivity is the spontaneous emission of radiation as wall as particles and energy l by the nucleus of elements due to their disintegration.
The radioactive particles that are usually emitted include:
alpha particles beta particles andneutronsThe neutron has a mass of 1.
When silver isotope having a mass of 107 absorbs a neutron, the silver isotope produces will have a mass of 108, Ag-108.
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6. How many moles of water would require 92.048 kJ of heat to raise its temperature from 34.0 °C to 100.0 °C? (3 marks)
Answers
Taking into account the definition of calorimetry, 0.0185 moles of water are required.
CalorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
Mass of water requiredIn this case, you know:
Heat= 92.048 kJMass of water = ?Initial temperature of water= 34 ºCFinal temperature of water= 100 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
92.048 kJ = 4.186 [tex]\frac{J}{gC}[/tex]× m× (100 °C -34 °C)
92.048 kJ = 4.186 [tex]\frac{J}{gC}[/tex]× m× 66 °C
m= 92.048 kJ ÷ (4.186 [tex]\frac{J}{gC}[/tex]× 66 °C)
m= 0.333 grams
Moles of water requiredBeing the molar mass of water 18 [tex]\frac{g}{mole}[/tex], that is, the amount of mass that a substance contains in one mole, the moles of water required can be calculated as:
[tex]amount of moles=0.333 gramsx\frac{1 mole}{18 grams}[/tex]
amount of moles= 0.0185 moles
Finally, 0.0185 moles of water are required.
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true or false:Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases
Answers
Answer:
True
Explanation:
This is true.
Earth's atmosphere is composed of about 78 percent nitrogen, 21 percent oxygen, 0.9 percent argon, and 0.1 percent other gases is a true statement.
What are the main components of the atmosphere?The main components of the Earth's atmosphere are nitrogen (78%) and oxygen (21%).
Atmosphere, the gaseous layer that surrounds the Earth, is composed of gases such as oxygen, hydrogen and carbon dioxide. It is divided into layers and ensures survival on the planet.
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Order the atoms from largest to smallest: Cs , Si , Sn .
Answers
Answer:
Si, Sn, Cs
Explanation:
Atomic no. Atomic radius
Silicon Si_______14___________0.117
Tin Sn______50___________0.140
cesium Cs______55___________0.262
Silicon is the smallest among these
