Answer:
Oxygen enrichment of combustion air to increase flame temperatures by reducing the proportion of nitrogen used in the combustion process is of particular value to operators of high-temperature furnaces.
what is packing fraction ?
state the formula used to calculate it.
thankyou ~
Answer:
please mark me brainliestExplanation:
Packing fraction is defined as a way of expressing the variation of isotopic mass from whole mass number (atomic mass). This fraction can have positive or can have negative sign. A positive packing fraction describes a tendency towards instability.The equation for packing fraction is: Packing fraction = (N atoms) x (V atom) / V unit cell. N atoms is the number of atoms in a unit cell. V atom is the volume of the atom, and V unit cell is the volume of a unit cell. Substitute the number of atoms per unit cell into the equation.Ni(CO)4 how many moles of oxygen
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?
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 equation for a half-reaction that occurs in acidic solution. Use e− as the symbol for an electron.
MnO_{4}^{-} -> MnO_{2}
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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What is the molarity of a solution formed from 0.625 moles of NaCl with a total volume of 250 mL
Answer:
2.5 M
Explanation:
.625 M / .250 Liter = 2.5 M
Calculate the mass of NaCO3 used in experiment. SHOW WORK — 15 points!!
Mass of empty evaporating dish: 46.233g
Mass of evaporating dish + sodium bicarbonate: 48.230g
Mass of evaporating dish + product after 1st drying: 47.504 g
Mass of evaporating dish: 46.233g
Mass of evaporating dish + product after 2nd drying: 47.485
The mass of sodium bicarbonate (NaHCO₃) used in the experiment is 1.997 g
Calculating massFrom the question we are to calculate the mass of NaHCO₃ (sodium bicarbonate) used in the experiment
From the given information
Mass of empty evaporating dish = 46.233g
Mass of evaporating dish + Sodium bicarbonate = 48.230g
∴ Mass of sodium bicarbonate (NaHCO₃) = [Mass of evaporating dish + Sodium bicarbonate] - [Mass of empty evaporating dish]
Mass of sodium bicarbonate (NaHCO₃) = 48.230g - 46.233g
Mass of sodium bicarbonate (NaHCO₃) = 1.997 g
Hence, the mass of sodium bicarbonate (NaHCO₃) used in the experiment is 1.997 g
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Which reaction represents a nuclear reaction?
CO2+H2O→H2CO3
2Na+Cl2→2NaCl
92238U→90234Th+24He2+
2H2O2→2H2+O2
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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MATH AND SCIENCE
Out of around 260,000 known species of angiosperms, approximately 195,000 are dicots. what percentage of angio sperms are dicots
Answer:
Explanation:
Formula
% = (dicots/angiosperms) * 100
Givens
angiosperms (total) = 260000
Dicots = 195000
Solution
% = (195000/260000) * 100
% = 0.75 * 100
Answer: % = 75% are dicots
list three differences between liquids and gases
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
Which of these events leaves small pieces of rocks in new places? (4 points)
a
Deposition
b
Weathering
c
Erosion
d
Oxidation
Answer:
Deposition
Explanation:
Deposition is a process that lays down sediment and changes the shape of the land.
Use the molar volume to calculate the number of moles of CO2 in 4.00L of CO2 gas at STP.
The number of moles will be 0.178 moles. It can be calculated by ideal gas law.
What is ideal gas law?The ideal gas law gave the relationship between pressure, volume as well as temperature. It can be expressed as:
PV =nRT
Where, P is pressure, V is volume and T is temperature.
Calculation of number of moles by using ideal gas law.
Put the value of given data in above ideal gas law formula.
n = PV / RT
n = (1 atom × 4 L)/ (0.0821 × 273 K
n = 0.178 moles.
Therefore, the number of moles will be 0.178 moles.
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An atom of lead has a mass of 17.6 times greater than the mass of an atom of carbon-12. What is the molar mass of this isotope of lead?
Answer:
211.2g/mol
Explanation:
[tex]mass \: of \: carbon = 12 \\ mass \: of \: lead = 12(17.6) \\ = 211.2gmol {}^{ - 1} [/tex]
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.
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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Learning task 1:compare and contrast mitosis and meiosis by filling up the table below.
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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Which of the following is NOT an example of potential energy?
A. Gravitational pull C. Chemical Bonds
B. Nuclear energy D. Electricity
Answer:
Answer C
Explanation:
Chemical Bonds
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?
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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How many atoms of oxygen are present: 3Al2(SO4)3
a. 36
b. 12
c. 10
d. 24
Answer:
the answer is 12
Explanation:
In one formula unit of Al2(SO4)3 A l 2 ( S O 4 ) 3 , there would be twelve atoms of oxygen.
2. What are the main processes by which metamorphic rock is created?
erosion and deposition
melting and volcanic activity
erosion and heat
heat and pressure
Oxidation number of nitrogen in Hydrazine (N2H4)
2.N + 4.H = 0
2N + 4.1 = 0
2N=-4
N=-2
The measurement 0.41006 gram, rounded to four significant figures, is expressed as... 1) 0.4100 g
2) 0.410 g
3) 0.41 g
4) 0.4101 g
Answer:
option B = 0.410 g
Explanation:
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What is the compound name for this compound structure?
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 the volume of 1.758 mole of a gas at standard temperature and pressure
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
Which of the following is a valid mole ratio from the balanced equation 2Fe2O3 + 3C --> 4Fe + 3CO2?
2 mol Fe2O3
4 mol Fe
4 mol C
3 mol Fe
2 mol Fe2O3
4 mol C
3 mol C
4 mol CO2
Answer:
From the given balanced equation, the valid mole ratio is four moles of Fe over 3 moles of moles of c02..
Explanation:
Mole ratio can be defined as the ratio of mole compound with the another.
What would be the immediate product of neutron absorption by Ag 107
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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Mass of 1.5 mole electron is
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
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Which part of the water cycle helps to cool the temperature the most?
runoff
infiltration
rainfall
evaporation ( Science )
20 L of nitrogen gas are collected at a temperature of 50°C and 2 atm. How many grams of nitrogen gas were collected?
Answer:
0.1077 grams
Explanation:
First we will employ the ideal gas law to determine the number of moles of nitrogen gas.
PV=nRT
P=2 atm
V=20L
R=0.08206*L*atm*mol^-1*K^-1
T=323.15 K
Thus, 2atm*20L=n*0.08206*L*atm*mol^-1*K^-1*323.15K
K, atm, and L cancels out. Thus n=2*20mol/0.08206*323.15=1.5 moles
Lastly, we must convert the number of moles to grams. This can be done by dividing the number of moles by the molar mass of nitrogen gas, which is 14 grams.
1.5/14=0.1077 grams
Order the atoms from largest to smallest: Cs , Si , Sn .
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
Question 1 (2 points)
Calculate the following and provide the answer rounded off to the correct accuracy.
2.150 x 102 cm + 7.34 x 102 cm - 3.2 x 102 cm
X
Answer Instructions:
– For a decimal, use (.) and not (.).
As
Note: Your answer is assumed to be reduced to the highest power possible.
The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm
What is the power of a variable?The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.
Given that:
[tex]\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }[/tex]
So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.
i.e.
[tex]\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }[/tex]
[tex]\mathbf{= 6.29 \times 10^2\ cm }[/tex]
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Is glycosphingolipid and Sphingomyelin same?
Answer:
Yes, they are same
Explanation:
Glycosphingolipids are a subtype of glycolipids containing the amino alcohol sphingosine. They may be considered as sphingolipids with an attached carbohydrate. Glycosphingolipids are a group of lipids (more specifically, sphingolipids) and are a part of the cell membrane.
Answer:
glycosphingolipid is an example of sphingomyelin
