Answer:
You'd need 6.55 L of oxygen at STP to form that much water.
Explanation:
1. The number density of conduction electrons in pure silicon at room temperature is about 11016m3. By doping with phosphorous, you desire to increase this number by a factor of 1 million(106). At room temperature, assume that the thermal energy is sufficient that all of the extraelectrons from the P doping enter the conduction band. What fraction of silicon atoms must youreplace with phosphorous atoms
This question is incomplete, the complete question is;
The number density of conduction electrons in pure silicon at room temperature is about 10¹⁶ m⁻³. By doping with phosphorous, you desire to increase this number by a factor of 1 million (10⁶). At room temperature, assume that the thermal energy is sufficient that all of the extra electrons from the P doping enter the conduction band. What fraction of silicon atoms must you replace with phosphorous atoms
Answer:
the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Explanation:
Given that;
the number density no = 10¹⁶ m⁻³
Required no = (10¹⁶ × 10⁶) = 10²² m⁻³
Each silicon atom has 4 valence electron,
Hence; Silicon density = 10¹⁶/4
now, if x = No of silicon atoms to be replaced with phosphorous, then;
(10¹⁶/4 - x)4 + 5x = 10²²
10¹⁶ - 4x + 5x = 10²²
10¹⁶ + x = 10²²
x = 10²² - 10¹⁶
Fraction of silicon atoms will be;
⇒ 10²² - 10¹⁶ / 10¹⁶/4
⇒ 4( 10²² - 10¹⁶ / 10¹⁶ )
⇒ 4( 10²²/10¹⁶ - 10¹⁶/10¹⁶ )
⇒ 4( 10⁶ - 1 )
Therefore, the fraction of silicon atoms we must replace with phosphorous atoms is 4( 10⁶ - 1 )
Arrange the values according to magnitude greatest to least 8.2*10^—6, 65000, 1.1*10^2, 3.3*10^-2, and 9.0*10^-6.
Answer:
65000 > 110 > 0.033 > 0.0000090 > 0.0000082.
Explanation:
Hello there!
In this case, since those numbers are given in scientific notation, it turns out relevant to express them in standard notation as shown below:
0.0000082
65000
110
0.033
0.0000090
Thus, by arranging them from greatest to least, we obtain:
65000 > 110 > 0.033 > 0.0000090 > 0.0000082
Best regards!
Buffers are substances that help resist shifts in pH by Question 10 options: 1) releasing H in acidic solutions. 2) donating H to a solution when they have been depleted. 3) releasing OH- in basic solutions. 4) accepting H when the are in excess. 5) donating H to a solution when they have been depleted and accepting H when the are in excess.
Answer:
5) donating H to a solution when they have been depleted and accepting H when they are in excess.
Explanation:
A buffer solution is a solution that undergoes a negligible change in pH in addition of moderate quantities of acid or alkali. In other words, a buffer solution is one that resists a change in pH on addition or dilution of small amounts of acids or alkalis.
So, from the given question:
Buffers are substances that help resist shifts in pH by donating H to a solution when they have been depleted and accepting H when they are in excess.
Why do not all rock types contain fossils?
Excessive heat and pressure can destroy fossils.
Fossils can only be created in certain places around the world.
Fossils cannot be created near volcanoes.
Fossils are too large to be found in igneous and metamorphic rocks.
Answer:
Igneous rocks form from molten rock, and rarely have fossils in them. Metamorphic rocks have been put under great pressure, heated, squashed or stretched, and fossils do not usually survive these extreme conditions. Generally it is only sedimentary rocks that
Explanation:
Hope it helps, some how.
Your welcome :)
Which of the following is a binary ionic compound?
a Sulfuric acid
b Hydrogen sulfide
с
Sodium fluoride
d None of the above
Answer:
D; none of the above
Explanation:
Binary ionic compounds are composed of one metal and one nonmental.The metals are always the first element whereas the nonmetals are the second element.
Answer: Sodium fluoride
1. Oxygen gas has a pressure of 680 mmHg. What is the pressure in atmospheres?
If a sample of oxygen gas occupies 30.0 mL at -10°C and 680 mmHg, what is the volume at 10°C and 310 mmHg? Express your answer to two significant figures and include the appropriate units.
How many moles are in 2.35 x 1024 molecules of H2?
Answer:12
Explanation:because it’s 12
BRAINLIEST AND 20 POINTS!!!
What changes does sugar undergo when heated in a spoon over the flame?
Select one:
A. A physical change, then a chemical change
B. Two physical changes
C. Two chemical changes
D. A chemical change, then a physical change
Answer:
a
Explanation:
Which element is malleable and ductile?
A. Phosphorus
B. Argon
C. Sodium
D. Chlorine
Can you help me answer all of these I’ll mark brainliest
Answer:
C.) Sodium
Explanation:
Sodium is an "Alkali Metal"
What do a fruit salad, a carbonated beverage, and a pile of clothes have in common?
Answer:
They're all mixtures of something
Explanation:
Study the balanced chemical equations for the reactions of methane (CH4) with oxygen and hydrogen with oxygen.
Methane is the main component of fossil fuels such as natural gas.
CH4 + 202 - CO2 + 2H20 + energy
2H2 + O2 + 2H2O + energy
What product of the reaction of methane has an impact on the environment?
Answer:
CO2 (Carbon Dioxide) has a negative impact on environment.
Explanation:
CO2 is a product of combustion of Methane
The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
What are the harmful causes of methane?As methane exists emitted into the air, it responds in several dangerous ways. It predominantly leaves the atmosphere through oxidization, comprising water vapor and carbon dioxide. Methane inhalation can result in mood modifications, slurred speech, vision problems, memory loss, nausea, vomiting, facial flushing, and headache. In severe cases, there may be differences in breathing and heart rate, balance concerns, numbness, and unconsciousness.
Hence, The carbon dioxide product of the reaction of methane includes an influence on the environment. So, not only does methane contribute to global warming instantly but even, indirectly via the release of carbon dioxide.
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Las capas del lecho marino del Mar Mediterráneo cuentan la historia de los cambios ambientales en el hoy desértico norte de Africa desde hace 160.000 años, haciendo uso de la regla de tres simple y notación científica indicar a cuántas décadas corresponde este periodo de tiempo con procedimiento
Answer:
160.000 años corresponde a 16.000 décadas.
Explanation:
Para resolver correctamente el ejercicio debemos plantear la regla de tres simple de la siguiente manera:
1 década equivale a 10 años; A cuantas decadas equivalen 160.000 años?
1 década→10 años
x ←160.000 años
Debemos multiplicar 160.000 por 1 y luego dividir entre 10 ;
x=([tex]\frac{160.000x1}{10}[/tex])=16.000 décadas; en notación científica sería 16x10^3.
Respuesta: 160.000 años corresponde a 16.000 décadas.
☆ Electrons are much more unpredicable
the what bour said
Answer:
this is very true
Explanation:
Compound X has a molar mass of 416.48 g mol
and the following composition:
element
mass 0/0
phosphorus
14.87%
chlorine
85.13%
Write the molecular formula of X.
Answer:
P₂Cl₁₀
Explanation:
From the question given above, the following data were obtained:
Molar mass of compound X = 416.48 g/mol
Percentage of phosphorus (P) = 14.87%
Percentage of Chlorine (Cl) = 85.13%
Molecular formula of X =?
Next, we shall determine the empirical formula of compound X. This can be obtained as follow:
P = 14.87%
Cl = 85.13%
Divide by their molar mass
P = 14.87 / 31 = 0.480
Cl = 85.13 / 35.5 = 2.398
Divide by the smallest
P = 0.480 / 0.480 = 1
Cl = 2.398 / 0.480 = 5
Empirical formula of compound X is PCl₅
Finally, we shall determine the molecular formula of compound X. This can be obtained as follow:
Molar mass of compound X = 416.48 g/mol
Empirical formula = PCl₅
Molecular formula =?
Molecular formula= [Empirical formula]ₙ
[PCl₅]ₙ = 416.48
[31 + (35.5 × 5)]ₙ = 416.48
[31 + 177.5]n = 416.48
208.5n = 416.48
Divide both side by 208.5
n = 416.48 / 208.5
n = 2
Molecular formula = [PCl₅]ₙ
Molecular formula = [PCl₅]₂
Molecular formula = P₂Cl₁₀
Therefore, the molecular formula of compound X is P₂Cl₁₀
What is the change in enthalpy for a reaction if the reactants have 270 kJ of energy and the products have 150 kJ of energy
Answer-150 kj
Explanation:
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Help plzzzzz it's due today ----- Would Shining light on the reaction increase or decrease the reaction rate
Answer:
increase
Explanation:
Reactions that are initiated by light are called photochemical reactions. The brighter the light, the faster the reaction.
Answer: An increase in temperature typically increases the rate of reaction. An increase in temperature will raise the average kinetic energy of the reactant molecules. Therefore, a greater proportion of molecules will have the minimum energy necessary for an effective collision (Figure. 17.5 “Temperature and Reaction Rate”).
Explanation:
Zn(s) =PbCI2(aq) ZnCI2(aq)+Pb(s) reaction type
Answer:
Redox reaction
Explanation:
Cytokinesis happens differently for plant and animal cells. Both separate cytoplasm between two new daughter cells. However, which type of cell cytokinesis has the old cell membrane begin changing into a new cell wall between the two connected newly formed daughter cells?
Question 1 options:
Both
Plant cell cytokinesis
Animal cell cytokinesis
Neither
50 points need answer will give crown
Answer:
C
Explanation:
How many atoms of which elements are represented by the following formula?
C6H12N
Answer:
19 atoms
Explanation:
6 carbon, 12 hydrogen, one Nitrogen
What happens to the chemical energy in methane's bonds
when methane reacts with oxygen and forms H20 and CO,?
Answer: chemical energy is converted to heat and light energy
Explanation: exothermic reaction
4CH3+7O2–>6 H2O+4CO2+energy
Which conditions suggest that a bond will be ionic
if solution conduct electricity then it will ionic bond
What does electric current measure?
O how well electrical energy moves in a circuit
O how quickly electrical energy moves in a circuit
O how frequently electrical energy moves in a circuit
O how much electrical energy moves in a circuit
Answer:
Explanation:
Electric current in a wire, where the charge carriers are electrons, is a measure of the quantity of charge passing any point of the wire per unit of time. ... Current is usually denoted by the symbol I. Ohm's law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR.
Answer: O how well electrical energy moves in a circuit
Explanation: Electric current is a measure of the flow of charge, as, for example, charge flowing through a wire. Electric current in a wire, where the charge carriers are electrons, is a measure of the quantity of charge passing any point of the wire per unit of time.
4. A new compound X has been made, and a 5 x 10-4 Molar solution of it gives an absorbance of 0.405 at the maximum absorbance of 265 nm. The path length of the UV cell is 0.5cm.
Use Beer’s Law to calculate the Molar Absorptivity coefficient of Compound X at this wavelength, quoting the correct units.
Answer:
1620 cm⁻¹·M⁻¹
Explanation:
Beer's Law states that:
A = ε * b * C
Where A is the absorbance, ε is the Molar Absorptivity coefficient, b is the path length, and C is the molar concentration.
Use the given data:
0.405 = ε * 0.5 cm * 5x10⁻⁴ M
And solve for ε:
ε = 1620 cm⁻¹·M⁻¹
So the Molar Absorptivity coefficient of Compound X at this 265 nm is 1620 cm⁻¹·M⁻¹.
Which statement describes the relationship between bonding and surface tension?
A. The more hydrogen bonds a molecule can make, the lower the surface tension.
B. The more jonic bonds a molecule can make, the higher the surface tension
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
D. The more ionic bonds a molecule can make, the lower the surface tension.
Answer: c
Explanation:
Answer:
C. The more hydrogen bonds a molecule can make, the higher the surface tension.
Explanation:
Question 1 S
A student left a sealed jar of water outside her home. Water can be a solid liquid or gas When she put it outside the water was a
solid Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
A Before the student left, the molecules were moving in place. After the molecules were moving around each
other
B Before the student left, the molecules were moving around each other After the molecules were moving away
from each other.
C Before the student left the molecules were moving around each other. After the molecules were moving in
place
D. Before the student left the molecules were moving away from each other. After the molecules were moving
around each other
Answer:
A
Explanation:
Before the student left, the water molecules were moving in place, then after that, the water molecules were moving around each other.
Option A is correct.
Water can exist in three phases of matter as solid, liquid, or gas. In the solid state, the constituent of the particles is closely packed together.
In the liquid state, the particles are held together by intermolecular forces and they move around each other.In the solid state, before the student left the sealed jar outside her house, the particles molecules of the water are moving in place closely packed together, but after a period of time, the molecules start to move around each other.
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How do we determine climate?
a
I have no idea
b
Precipitation and weather
c
Temperature and weather
d
Precipitation and temperature
Answer:
D but I’m traitor figure out y my question is precipitation helps determine climate by. Weathe. My options are The interaction of the prevailing winds upon land or oceans. The development of local storms. The passage of weather fronts. All of the above
Explanation:
The study of the interaction between animals and plants within a specific environment is called
Answer:
The study is called ecology
Explanation:
Mark as brainliest if I'm correct
Answer:
i think its ecology im not sure since im bad at math lol
Squirrels eat acorns for energy and to grow and repair tissues. How is an acorn used to build squirrel muscle?
The elements in the acorn can be rearranged to make the molecules the squirrel’s body needs
The energy from the acorn warms any damaged muscle and allows it to repair itself and heal
The proteins found in acorns are the same as squirrel muscle proteins, so they attach to muscle cells
Once the acorn has been digested by the squirrel, the carbohydrates are converted to muscle tissue
Answer:
The elements in the acorn are rearranged to make the molecules the squirrel's body needs. The proteins found in acorns are the same as squirrel muscle proteins, so they attach to muscle cells.
Explanation:
hpoe this helps
The reaction used to produce solid iron ore is below.
Fe2O3 (s) + 3CO (g) à 2Fe (s) + 3CO2 (g)
The reaction of Fe2O3 with CO has a theoretical yield of 129 grams solid Fe. In the laboratory, your reaction produces 87.4 grams of solid Fe. What is the percent yield?
what element has 1 proton, 1 neutron, and 2 electrons?
Answer:
Tritium
Tritium is a hydrogen isotope consisting of one proton, two neutrons and one electron. It is radioactive, with a half-life of 12.32 years.
Explanation:
hope it helps :)))
The element which possess one neutron, one proton and two electrons is helium, He. The atomic number of helium is 2 in periodic table and have a mass number of 4 also.
What is helium ?Helium is second element in the periodic table. It is a noble gas and thus unreactive because its valence shell is completely filled and thus helium is placed in the noble gas group 18.
Atomic number of an element is number of electrons in it. For a neutral atom the number of electrons and protons are equal. Thus, all the positive charges is neutralised by equal number of electrons.
Neutrons have no charge and thus, they are neutral. Atoms forms positive ions when number of protons dominate and they will form negative ions if they gain electron and thus number of electrons dominates.
The sum of number of protons and neutrons is called mass number of the element. Helium contains 2 neutron and 2 oproton, thus its mass number is 4 and its atomic number is two.
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