Answer:
22Mol
Explanation:
2Mg + O2 --> 2MgO
If 11 mols of O2 reacted with excess Mg with 22 MgO moles will be created
Which of the following species cannot act as a Lewis base?
NH2-
NH4+
NH3
N3-
NH2-
Answer:
NH4+
Explanation:
A Lewis base is a substance with the ability to share or give pairs of electrons.
The NH4 + ammonium ion donates a proton, therefore the ammonium ion is a Lewis acid.
The species that cannot act as a Lewis base NH4+.
What is Lewis's base?
It refers to a substance like OH- ion where the pair should be donated of non-binding electrons. It should be treated as the electron-pair donor. Also, the one advantage is that it complements the reduction and oxidation of the reaction model. Moreover, it shows the capability for sharing or providing the pair of electrons. Also, NH4+ donated the portion so ammonium ion is a Lewis acid.
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The sugar deoxyribose is an important component of DNA. Deoxyribose is 44.8% 7.5% H, and 47.7% O by mass. What is the empirical formula for deoxyribose?
Answer:
C₅H₁₀O₄
Explanation:
The empirical formula is the simplest whole-number ratio of atoms in a compound.
The ratio of atoms is the same as the ratio of moles.
So, our job is to calculate the molar ratio of C:H:O.
Assume 100 g of deoxyribose.
1. Calculate the mass of each element.
Then we have 44.8 g C, 7.5 g H, and 47.7 g O.
2. Calculate the moles of each element
[tex]\text{Moles of C} = \text{44.8 g C} \times \dfrac{\text{1 mol C}}{\text{12.01 g C}} = \text{3.730 mol C}\\\\\text{Moles of H} = \text{7.5 g H} \times \dfrac{\text{1 mol H}}{\text{1.008 g H }} = \text{7.44 mol H}\\\\\text{Moles of O} = \text{47.7 g O} \times \dfrac{\text{1 mol O}}{\text{16.00 g O }} = \text{2.981 mol O}[/tex]
3. Calculate the molar ratio of the elements
Divide each number by the smallest number of moles
C:H:O = 3.730:7.44:2.981 = 1.251:2.50:1 = 5.005:9.98:4 ≈ 5:10:4
4. Write the empirical formula
EF = C₅H₁₀O₄
SUU
What explains the key difference between a bomb calorimeter and a coffee cup calorimeter?
A bomb calorimeter is 10 times larger but works the same way
A bomb calorimeter measures heat for liquid products only
A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that
do not occur in water.
A bomb calorimeter can measure heat gain or loss in gaseous reactions but is not useful for reactions that occur at high
pressures and temperatures.
Save and Exit
RE
Mark this and retum
Answer: The answer is C
Explanation:
A bomb calorimeter has a separate chamber to hold substances and can even measure heat gain or loss for reactions that do not occur in water.
The third option is correct.
The following information should be considered:
In the case of bomb calorimeters it have the distinct chamber for holding the substance. Also it determined the heat gain or loss with respect to the reactions that does not arise in the water.learn more: https://brainly.com/question/17429689?referrer=searchResults
The image below shows the surface of the Moon.
The circle-shaped pits on the surface of the Moon are usually caused by collisions with asteroids or comets and are known as _______.
A.
plains
B.
mountains
C.
dunes
D.
craters
When human prevent waste or loss it is known as
Answer:
im not sure exactly what terms this question is in but recycling?
If I add 375 of water to 125 mL of a 0.90 M NaOH solution, what will the molarity of the diluted solution be?
Answer:
0.225M
Explanation:
Step 1:
Data obtained from the question. This includes:
Volume of the stock solution (V1) = 125mL
Molarity of the stock solution (M1) = 0.90 M
Volume of the diluted solution (V2) = 125 + 375 = 500mL
Molarity of the diluted solution (M2) =..?
Step 2:
Determination of the molarity of the diluted solution.
This is obtained by using the dilution formula as follow:
M1V1 = M2V2
0.9 x 125 = M2 x 500
Divide both side by 500
M2 = (0.9 x 125) /500
M2 = 0.225M
Therefore, the molarity of the diluted solution is 0.225M
Answer:
The molarity of the diluted solution of NaOH is 0.225 M NaOH
Explanation:
Here, we have, initial concentration of the solution = 0.90 M NaOH
Volume of initial solution = 125 mL
Volume of added water = 375 mL
Total volume of diluted solution = 375 mL + 125 mL = 500 mL
Number of moles in the diluted solution = 0.9 × 0.125 = 0.1125 moles of NaOH
Derived from the following relation;
0.9 M NaOH indicates that 1000 mL contains 0.9 moles of NaOH
Therefore, 1 mL contains 0.9/1000 moles of NaOH and 125 mL contains 0.9/1000×125 or 0.9 × 0.125 moles of NaOH
Therefore, the diluted 500 mL solution contains 0.1125 moles of NaOH. Therefore, 1000 mL of the diluted solution will contain [tex]1000 \times \frac{0.1125}{500} \ moles[/tex] of NaOH or 0.225 moles of NaOH
Hence the molarity of the diluted solution of NaOH, which is the number of moles per 1000 mL is 0.225 M.
A sample of hydrogen gas occupies 50.4 L at STP. This sample contains how many moles of hydrogen atoms
Answer: 4.5
Explanation:
Which of the following is an example of potential energy changing into kinetic energy?
A. A girl climbing up a hill
B. A fruit falling from a tree
C. A car stopping when the brake is applied
D. A child on a swing slowing down as she swings upwards
Answer
B. a fruit falling from a tree
Explanation:
Take, for example, an apple tree. ... The tree uses this energy to build leaves and branches and fruit. When an apple falls from the tree to the ground, its energy of position (stored as gravitational potential energy) is converted to kinetic energy, the energy of motion, as it falls.
Which type of mixture is likely to separate if it is allowed to sit still?
A. Colloid
B. Solution
C. Alloy
D. Suspension
Answer:
D.
Explanation:
Suspension : for example sand and water. You can separate it when it sits still.
The type of mixture is likely to separate if it is allowed to sit still is suspension. Therefore, option D is correct.
What is suspension ?A heterogeneous mixture of a finely dispersed substance in a liquid is referred to as a suspension. Similar to how salt and water dissolve in one another, the solid is not dissolved in the liquid.
Examples of mixtures that are most frequently used are chalk and water, dirty water, flour and water, dust and air, fog, magnesium milk, etc.
Suspension parts can be divided into three categories: linkages, springs, and shock absorbers. The bars and brackets that support the wheels, springs, and shock absorbers are known as links. The car is padded by springs, which reduce shock loads caused by potholes and bumps in the road.
A fluid mixture that contains solid particles large enough for sedimentation is called a suspension.
Thus, option D is correct.
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The specific heat of copper is 0.4 J/g^ *C If a sample of copper absorbs 480J of energy and its temperature changes from 20.0 ^* c to 60.0 ^ * C what mass of copper was heated?
Answer:
The mass of copper that was heated is 30 g
Explanation:
The formula for the heat supplied, ΔH is;
ΔH = m·c·Δt
Where:
ΔH = Heat supplied = 480 J
m = Mass of the copper sample = Required
c = Specific heat capacity of copper = 0.4 J/(g·°C)
Δt = Change in temperature = T₂ - T₁ = 60° - 20° = 40°C
T₁ = Initial temperature = 20°C
T₂ = Final temperature = 60°C
Therefore, plugging the values, we have;
480 = m×0.4×40
m = 480/(0.4 × 40) = 30 g
The mass of copper that was heated = 30 g.
THIS IS A SCIENCE QUESTION NOT A CHEMISTRY QUESTION! Why does the same side of the moon always face Earth?
the rotational period of Earth is the same as that of the moon
the rotational period of Earth is equal to one revolution around Earth
the rotational period of the moon is equal to one revolution around Earth
the rotational period of the moon is different than one revolution around Earth
Answer:yes
Explanation:Because yes
Answer:
C.
Explanation:
Comets _____. orbit the Earth are usually found between Jupiter and Mars have very irregular shapes have very elliptical orbits
Comets have very elliptical orbits, are usually found in the outer regions of the solar system, have irregular shapes, and exhibit a coma and tail when they approach the Sun.
Comets are celestial objects that have very elliptical orbits. Unlike planets, which have more circular orbits, comets follow a path that is elongated and elongated.
Comets are usually found in the outer regions of our solar system, beyond the orbit of Mars, in a region known as the Kuiper Belt or the Oort Cloud. These regions are located far away from the Sun, where the gravitational pull is weaker, allowing comets to maintain their elliptical orbits.
The irregular shape of comets is another characteristic feature. Unlike planets, which have a more spherical shape due to their strong gravitational force, comets have a more irregular shape. This is because comets are made up of a combination of ice, dust, rock, and other materials, which can cause them to have a lumpy or uneven appearance.
When a comet approaches the inner regions of the solar system, it can be observed as a bright coma or "head" surrounding a nucleus. The nucleus is the solid core of the comet, composed mainly of ice and rock. As the comet gets closer to the Sun, the heat causes the ice to vaporize, creating a glowing coma and often a tail that points away from the Sun.
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A new island formed by volcanic action may eventually become populated with living organism as a result of?
After volcanic eruption the new land will be populated with a large number of organisms called pioneer species. The process is called Primary succession.
What is primary succession?The process in which a new land is created or exposed for the first time after volcanic eruption is defined as the primary succession. During this time the lava cools and produces new rocks.
After this first of all the lichens are found to attach themselves to rocks and the plant species which can grow without much soil can appear. Gradually the decomposition of all these plants helps in soil formation.
As a result more and more plants begin to colonize the area. So this land then becomes a fertile land with lot of nutrients and can lead to the formation of forest. Then after secondary succession occurs.
Thus in primary succession the newly formed land has been populated by many living organisms.
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1.
Which phenomenon is responsible for sending electrically charged particles out into space?
prominences
sunspots
solar wind
O solar eclipses
w
Answer:
solar wind
Explanation:
pls pls pls give me brainiesttt tyty
good luck :)
What is the atomic number of this atom?
Answer:
2?????
Explanation:
Which type of muscle tissue aids in digestion
Answer: The muscularis (muscularis externa)
Explanation: please brainliest
the muscle that helps with digestion is a smooth muscle called the tract
The reaction in which two amino acids form a dipeptide and a water molecule is called a _____ reaction. condensation
hydration
Answer:
Condensation Reaction
Explanation:
5.
To inflate a weather balloon you must increase its volume from 0.58 L (nearly empty for a weather balloon) to a full volume
against an external pressure of 1 atm exactly. The process requires 22.632 kJ of work. What is the volume of the balloon?
(The original formula would be something around [deltaE = deltaH - PdeltaV])
Answer:
ANswers is simply
Explanation:
8.73kJ
which of these describes the electrostatic force
a. particles of the same charge repel each other
b. particles of different masses repel each other
c. particles of opposite charge repel each other
d. particles without charge repel each other
Answer:
A
Explanation:
like charge repel, unlike attract
Answer:
A.
Explanation:
Particles of the same charge repel each other. E.g. + and + OR - and -.
Given the equation representing a system at equilibrium in a sealed, rigid container:
2HI(g) <->H2(g) + I2(g) + energy
Increasing the temperature of the system causes the concentration of
1)HI to increase
2)H2 to increase
3) HI to Remain constant
4) HI to Remain constant
Answer: 1) HI to increase
Explanation:
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
[tex]2HI(g)\rightleftharpoons H_2(g)+I_2(g)+energy[/tex]
As the given reaction is exothermic , on increasing the tempearture, the equilibrium will shift in the direction where decrease in tempearture is taking place.So, the equilibrium will shift in the left direction. i.e. towards reactants. Thus amount of [tex]HI[/tex] will increase.
When the temperature of the system increased so it leads the concentration to option 1. HI to increase.
What is L-e-Ch-atelier's principle?It defines that if any change in the reaction variables so the equilibrium should be shifted in the direction so the impact should be minimized.
Since the given reaction is considered to be exothermic, so in the case when the temperature is increased so the equilibrium should be shifted in the direction that reduced the temperature.
Therefore, the equilibrium should be shifted in the left direction.
Hence the first option is correct.
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bruh i dont have a question what up ?
Answer:
?
Explanation:
Answer : the sky (teehee)
How does wavelength differ in high and low frequency waves?
In high frequency waves, the wavelength is short and appears in many short bursts. Meanwhile, in a low frequency wave, the wavelength is longer since it takes it a longer period of time to occur/pass.
An iron nail rusting is from a process called oxidation, this is an example of a
Answer:
Chemical change
Easy Help Please!!!!!!
Either oxidation or reduction can take place independently in any particular reaction. True or False
Answer:
False
Explanation:
Calculate the pressure using the formula
P= 1.03 + Mass on
Syringe/ area of Top of Syringe
Pressure:
kg/cm2
Answer:is 1.08 kg
Explanation:
Just got it wrong and it gave me the answer
47.5atm is the total pressure. The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure
What is pressure?The force delivered perpendicularly to an object's surface per unit area across how that force is dispersed is known as pressure (symbol: p / P).445 Gauge pressure, sometimes written as gauge pressure, is the pressure in relation to the surrounding air pressure.
Pressure is expressed using a variety of units. Some of these come from dividing a unit of force by a unit of area; for instance, the SI unit of stress, the pascal (Pa), is equal to one newton each square metre (N/m2), and the conventional unit of pressure used by both the imperial while US customary systems is the pound-force according square inch of surface (psi, symbol lbf/in2).
Volume of gas = 47.5ML
P x V=51.3
P x 47.5=51.3
P=47.5atm
Therefore, 47.5atm is the total pressure.
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Which observation indicates that the kinetic molecule theory has limited use for describing a certain gas
Answer:
Please Mark as Brainliest!!!!!!!!!!
Explanation:
Increasing pressure is causing a smaller change in gas volume. The closeness of particles of gas and their low speeds allow intermolecular forces to become important at certain pressured and temperature
Which subscripts complete the chemical formula for the compound?
CaHb
Answer choices for a: 1,3,8
b:1,3,8
Question:
Which subscripts complete the chemical formula for the compound?
Answer:
A: 3
B: 8
Answer:
A) 3
B) 8
Explanation:
At what temperature will 0.0705 mol of Cl2 exert a pressure of 900. torr at a volume of 0.750L? Round to 3 sig figs
Answer : The temperature [tex]Cl_2[/tex] gas is, 153 K
Explanation :
Using ideal gas equation:
[tex]PV=nRT[/tex]
where,
P = Pressure of [tex]Cl_2[/tex] gas = 900 torr = 1.18 atm (1 atm = 760 torr)
V = Volume of [tex]Cl_2[/tex] gas = 0.750 L
n = number of moles [tex]Cl_2[/tex] = 0.0705 mole
R = Gas constant = [tex]0.0821L.atm/mol.K[/tex]
T = Temperature of [tex]Cl_2[/tex] gas = ?
Putting values in above equation, we get:
[tex]1.18atm\times 0.750L=0.0705mole\times (0.0821L.atm/mol.K)\times T[/tex]
[tex]T=152.9K\approx 153K[/tex]
Therefore, the temperature [tex]Cl_2[/tex] gas is, 153 K
A group of scientists develops a new fertilizer. Which branch of chemistry are they engaged in?
A.) Organic Chemistry
B.) Inorganic Chemistry
C.) Biochemistry
D.) Analytical Chemistry
Answer:
A. Organic Chemistry
Explanation:
Because Fertilizer is a organic Mixture
Answer:
A. Organic Chemistry
Explanation:
Describe how a cold front affects weather.