Answer:
16.25 x 10^-20g
Explanation:
molar mass of PCl3
31(1)+3(35.5) = 137.5
n= mass/molar mass
7.14 x 10² = mass / 137.5
mass = 7.14 x 10² x 137.5
mass = 98175g
Which is a cause of desertification? A.farming B.creating reservoirs C.overgrazing D.driving motor vehicles
Answer:
overgrazing
Explanation:
The main cause of desertification is Overgrazing.
What is desertification?Desertification is a type of dryland land degradation in which biological production is lost as a result of natural processes or human activity, causing productive areas to become progressively arid.
Overgrazing by the animals makes the land dry and loss in the vegetation.
Farming produces vegetation not destroy vegetation.Creating reservoirs does not make land dry.Driving motor vehicles is also not the reason of desertification.Hence Overgrazing is the cause of desertification.
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Which sentence represents the inequality -2b + 7 > 27.5? Two times a number, plus seven, is less than twenty-seven and five tenths. Two times a number, plus seven, is greater than twenty-seven and five tenths. Negative two times a number, plus seven, is fewer than twenty-seven and five tenths. Negative two times a number, plus seven, is greater than twenty-seven and five tenths.
Answer:
Negative two times a number, plus seven, is greater than twenty-seven and five tenths.
Explanation:
The given equation is = -2b + 7 > 27.5
Here, let the number be b
2b will be written as two times a number
-2b will be Negative two times a number
+ 7 will be written as plus seven
> is the symbol of greater than
27.5 is written as twenty-seven and five tenths in words.
∴ The equation -2b + 7 > 27.5 will be written as Negative two times a number, plus seven, is greater than twenty-seven and five tenths.
Answer:
D
Explanation:
Which answer below correctly identifies the type of change and the explanation for the boiling of water?
o physical change because even though the change caused the temperature of the water to
increase, the water's physical properties remained exactly the same
o physical change because even though gas formation was observed, the water was undergoing a
state change, which means that its original properties are preserved
chemical change because gas formation was observed, which indicated that the water was
transformed into a different substance
O chemical change because a temperature change was observed, which indicated that the water
was transformed into a different substance
Answer:
O chemical change because a temperature change was observed, which indicated that the water
Explanation:
I have taken this class
Which will a positively charged object attract? an object that has a negative charge an object that has a smaller positive charge an object that has no charge an object that has a larger positive charge
Answer:
it will attract an object that has a negative charge
Positively charged objects will attract negatively charged objects.
Law of magnetic attractionsAccording to the law "like charges repel, unlike charges attract', a positively charged substance will repel other positively charged substances.
On the other hand, a positively charged substance will attract every other substance that is negatively charged.
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give three example of mixture that can be separated by filtration process
Answer:
Mixture of sand and water.Mixture of chalk particles in water.Mixture of pebbles and water.Explanation:
Hope it helps.
How many molecules are in each sample?
A. 4.9 g H2O
B. 54.4 g N^2
C. 89 g CCI4
D. 11 g C6H12O6
Answer:
To find the number of molecules first find the number of moles.
number of moles (n) = mass / molar mass (M)
then use the formula
N = n × L
where n = number of moles
N = number of entities
L = Avogadro's constant = 6.02 × 10^23entities to find the number of molecules
A. 4.9 g H2O
m = 4.9g
M = (2*1)+(16×1) = 2 + 16 = 18g/mol
n = 4.9/18 = 0.272mol
N = 0.272 × 6.02 × 10^23
= 1.6374*10^23 molecules of H2O
B. 54.4g of N2
m = 54.4g
M(N2) = 14×2 = 28g/mol
n = 54.4/28 = 1.942mol
N = 1.942 * 6.02*10^23
= 1.1690*10^24 molecules of N2
C. 89 g CCI4
m = 89g
M(CCl4) = 12 + (35.5 × 4) = 154g/mol
n = 89/154 = 0.577mol
N = 0.577 × 6.02 × 10^23
= 3.473*10^23 molecules of CCl4
D. 11 g C6H12O6
m = 11g
M(C6H12O6) = (12×6)+(12×1)+(16×6) =
180g/mol
n = 11/180 = 0.0611mol
N = 0.0611 × 6.02×10^23
= 3.678*10^22 molecules of C6H12O6
Hope this helps
PLEASE HELP ! ! ! Three quantum numbers are derived from Schrodinger’s equation that describe the probability of finding an electron around a nucleus: the principal quantum number, the angular momentum quantum number, and the magnetic quantum number. Define each quantum number.
Answer:
Principle Quantum Number: It describes the size of the orbital and the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
Angular momentum Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
Answer:
Principal Quantum Number: designates the principal electron shell. Angular Momentum Quantum Number-This quantum number determines it's shape of an orbital and thus it's angular distribution. This quantum number determines the number of orbital numbers, their orientation within the sub-shell.
Principal Quantum Number, n
It describes the size of its orbital and of the main energy level. It is represented by n. Where, n = 1,2,3,4....stands for K, L, M, N shell and so on..
ngular Momentum Quantum Number l
It describes the shape of the orbital and thus the angular distribution. It can take from 0 to (n - 1). That is l = 0,1,2,...,(n - 1)
The magnetic Quantum Number, m
It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from . When l = 2, the value of will be -2, -1, 0, +1, +2.
Explanation:
1.1 The elements with the lowest ionization energy of all element are
O The noble gases
O The alkali metals
O The alkaline earth metals
O The halogens
Answer:
O The alkali metalsThe elements with the lowest ionization energy of all element are alakli metals
Explanation:
According to research,
The element with the lowest ionization energy is cesium (Cs). Cesium has atomic number 55 and is in the fifth row of the periodic table.
Caesium is a soft, silvery-golden alkali metal .
A bomb calorimeter has a heat capacity of 3.82 kJ/°C. A sample of cinnamaldehyde is ignited in the calorimeter, resulting in a temperature increase from 24.53°C to 31.23°C. How much heat was created by the combustion of cinnamaldehyde?
Answer:
THE HEAT CREATED BY THE COMBUSTION OF THE CINNAMALDEHYDE IS 25.594 JOULES.
Explanation:
When heat capacity of a substance is given, the heat evolved or used up in the process is the multiplication of the heat capacity and the temperature difference.
Heat = Heat capacity * change in temperature
Heat capacity = 3.82 kJ/°C
Change in temperature = 31.23 C - 24.53 C = 6.7 °C
So therefore, the heat created by the combustion of the cinnamaldehyde is:
Heat = 3.82 * 6.7
Heat = 25.594 Joules
In conclusion, 25.594 J of heat is created from the combustion of cinnamaldehyde
Bird wings and dragonfly wings are both used for flight.
Answer:
Yes
Explanation:
What's the question?
Answer:
yes, they both use it to fllight.
Explanation:
As they are adapted to flight to various places to catch their prey and be safe from various type of harms.
hope it helps..
1. Find the volume ( cm3) of oxygen in: a. 1000cm3 of air b. 50 cm3 of air.
Answer:
A. 210 cm³
B. 10.5 cm³
Explanation:
It is important for us to note that air contains 21% of oxygen, O2. With this idea in mind, let us answer the questions given above.
A. Volume of air = 1000 cm³
Volume of O2 in air =.?
Percentage composition of O2 in air = 21%
Volume of O2 = 21% x 1000
Volume of O2 = 21/100 x 1000
Volume of O2 = 210 cm³
Therefore, the volume of O2 in 1000 cm³ of air is 210 cm³.
B. Volume of air = 50 cm³
Volume of O2 in air =.?
Percentage composition of O2 in air = 21%
Volume of O2 = 21% x 50
Volume of O2 = 21/100 x 50
Volume of O2 = 10.5 cm³
Therefore, the volume of O2 in 50 cm³ of air is 10.5 cm³.
Iron oxide reacts with carbon monoxide to produce iron and carbon dioxide, with the balanced chemical equation Fe2O3 +3C0 —> 2Fe +3CO2. What does this tell you
about the relative amounts of iron oxide and iron consumed and produced in this equation?
A. For every two moles of iron oxide consumed, one mole of iron is produced.
B. For every two grams of iron oxide consumed, one gram of iron is produced,
C. For every gram of iron oxide consumed, two grams of iron are produced.
D. For every mole of iron oxide consumed, two moles of iron are produced.
Answer:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
(1)Fe2O3 + 3CO → 2Fe + 3CO21 mol of iron oxide, is made up of 2 iron molecules and 3 oxygen molecules. In a balanced equation, both sides of the equation all of the molecules in the 1st half have to be included in the 2nd half of the equation as well.
Answer:
D. For every mole of iron oxide consumed, 2 moles od iron are produced.
Explanation:
Which is a use for clay? ceramics batteries plaster chalk ED2020
Answer:
Answer is A.
Explanation:
I litterally just took the quiz in Edge and I got 100%.
Answer:
The answer is A.) Ceramics because clay can't make chalk, plaster, or batteries but ceramics is the form of art you use clay in. I also took the test on edge 2021.
Explanation:
The diagram show the electron arrangements in the atom of 4 elements.
Which element does NOT form a covalent form?
The element does NOT forms a covalent bond is A
What is covalent Bond ?A covalent bond is a chemical bond that involves the sharing of electrons to form electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
Therefore, The element does NOT forms a covalent bond is A
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The products of a reaction are NaCl and H2O. What does the law of conservation of matter reveal about the reactants in the reaction? A. At least some of the reactants will include NaCl and H2O. B. The reactants will contain only Na, Cl, O, and H in some amounts. C. Na, Cl, O, H, and three other elements were the reactant elements. D. The reactants will have one Na, one Cl, one O, and two H atoms.
Answer:
D
Explanation:
total mass should be equal on both sides
it's a double do displacement reaction
HCl + NaOH --> NaCl + H2O
You are performing an
experiment in your lab. To
compare with other experiments
your results must be in moles.
During your final step you burn a
strip of magnesium (Mg), which
results in 187 grams of
magnesium oxide (MgO). How
should you enter your results?
PSP
O
A. 7.7 moles Mgo
B. 4.6 moles Mgo
C. 187 grams Mgo
D. 7536.1 moles Mgo
Resot Selection
Answer:
4.6 moles MgO
Explanation:
number of moles is equals to the mass in grams divided by RFM
RFM=16+24.3=40.3
187/40.3
=4.6 moles of MgO
During your final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
What are moles?The value of one mole is given by Avogadro's number which is 2.303 × 10²³ moles but here the used weight is given so number of moles will be calculated with other formula.
A strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) number of moles will be,
n = W / M
where , n = number of moles
W = given weight
M = molar mass
substituting the values in equation,
n = 187 / 40.30
n = 4.6 moles
Therefore, final step you burn a strip of magnesium (Mg), which results in 187 grams of magnesium oxide (MgO) the results would be 4.6 moles Mgo. option B is correct.
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Which of the following chemical reactions is reversible?
A. The burning of wood.
OB. The dehydration of copper sulfate (CuSO4).
O C. The neutralization of an acid.
OD. The freezing of water into ice
Reset Selection
Which of the following is an example of matter?
A. The air around you
B. Your thoughts
C. Radio waves
D. Heat from a fire
Answer:
A. The air around you
Explanation:
The air around us is an example of matter, as it is a gas.
Air has no definite shape/volume and has no definite structure, so it is a gas.
Our thoughts aren't matter because they have no physical atoms, and radio waves and heat waves aren't matter either because they are forms of energy.
Acids & bases/concentrationA mixture is made by mixing 425 mL of 0.94 M H2SO4 with 750. mL of 0.83 M NaOH. (a) What is the limiting reactant? (b) How much excess reactant will be left over? (c) Is this mixture acidic or basic? Why?(d) What is the concentration of the [H+] or [OH-] ions that remain in this solution?(e) Calculate the pH of this solution.
Answer:
a. NaOH is limiting reactant
b. 0.0882 moles H₂SO₄
c. Acidic
d. 0.15M [H⁺]
e. pH = 0.82
Explanation:
The reaction of NaOH with H₂SO₄ is:
2NaOH + H₂SO₄ → 2H₂O + Na₂SO₄
a. To calculate limiting reactant:
Moles NaOH:
750mL = 0.750L ₓ (0.83mol / L) = 0.6225moles NaOH
Moles H₂SO₄:
425mL = 0.425L ₓ (0.94mol / L) = 0.3995moles H₂SO₄
As 1 mole of H₂SO₄ reacts with 2 moles of NaOH, moles of NaOH that must react with 0.3995moles H₂SO₄ are:
0.3995moles H₂SO₄ ₓ (2moles NaOH / 1 mole H₂SO₄) = 0.799 moles of NaOH.
As you have just 0.6225 moles of NaOH
NaOH is limiting reactantb. 0.6225 moles of NaOH will react with:
0.6225 moles NaOH ₓ (1 mole H₂SO₄ / 2 mole NaOH) = 0.3113 moles H₂SO₄
That means will remain:
0.3995moles H₂SO₄ - 0.3113 moles H₂SO₄ =
0.0882 moles H₂SO₄c. As you have an excees of sulfuric ACID, the mixture will be acidic
d. From 1 mole of H₂SO₄ you will have in solution 2 moles of H⁺, thus, from 0.0880 moles of H₂SO₄you will obtain 0.0882*2 = 0.1764 moles of H⁺
In 425 + 750mL = 1175mL = 1.175L
[H⁺] = 0.1764 moles of H⁺ / 1.175L =
0.15M [H⁺]e. As pH is -log [H⁺]
pH = 0.82what’s the mass of 0.0485 moles of Na2CO3
Answer:5.1g
Explanation:number of moles of Na2co3 is 0.0485 and it molar mass = 23×2+12+16×3=106
n=m/M
Therefore m= n×M
m= 0.0485×106
=5.141g
The mass of 0.0485 moles of Na2CO3 of 5.141 grams.
What is mass?Mass is defined as a dimensionless number used to describe the mass of a particle or item. Inertia, or the body's resistance to acceleration when a net force is applied, is also measured by this term. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit. Mass is a physical body's total amount of matter. Gravity and inertia, which are the two main forces influencing how objects move in space, make mass crucial.
Mass can be calculated as
Mass = molar mass x number of moles
Molar mass = 23 x 2 + 12 + 16 x 3
= 106 grams
Mass = 106 x 0.0485
= 5.141 grams
Thus, the mass of 0.0485 moles of Na2CO3 of 5.141 grams.
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The average score for games played in the NFL is 21.1 and the standard deviation is 8.9 points. 46 games are randomly selected. Round all answers to 4 decimal places where possible and assume a normal distribution.
A. P(21.4317 < ¯x < 22.7561) =
B. Q1 for the ¯x distribution =
The line next to the x should be over the x.
Answer:
A) P(21.4317 < ¯x < 22.7561) = 0.2975
B) Q1 for the ¯x distribution = 21.9844
Explanation:
The Central Limit theorem allows us to say that
Sample mean = Population mean = 21.1 points
Mean of sampling distribution = σₓ = (σ/√n)
σ = population standard deviation = 8.9 points
n = sample size = 46
σₓ = (8.9/√46) = 1.3122334098 = 1.3122
A) P(21.4317 < ¯x < 22.7561) =
This is a normal distribution problem
To find this probability, we will use the normal probability tables
We first normalize/standardize 21.4317 and 22.7561.
The standardized score of any value is that value minus the mean divided by the standard deviation.
For 21.4317
z = (x - μ)/σ = (21.4317 - 21.1)/1.3122 = 0.25
For 22.7561
z = (x - μ)/σ = (22.7561 - 21.1)/1.3122 = 1.26
The required probability
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
Checking the tables
P(21.4317 < ¯x < 22.7561) = P(0.25 < z < 1.26)
= P(z < 1.26) - P(z < 0.25)
= 0.89617 - 0.59871
= 0.29746 = 0.2975 to 4 d.p.
B) Q1 for the distribution is the first quartile. The first quartile is greater than 25% of the distribution.
P(x > Q1) = 0.25
Let the z-score that corresponds to Q1 be z'
P(x > Q1) = P(z > z') = 0.25
But P(z > z') = 1 - P(z ≤ z') = 0.25
P(z ≤ z') = 1 - 0.25 = 0.75
From the normal distribution tables,
z' = 0.674
z' = (Q1 - μ)/σ
0.674 = (Q1 - 21.1)/1.3122
Q1 = 0.674×1.3122 + 21.1 = 21.9844228 = 21.9844 to 4 d.p.
Hope this Helps!!!
How can we tell the difference between gases like hydrogen, oxygen, and carbon dioxide cause they all look to same?
Answer:
The critical chemical difference is that CO2 contains one atom of carbon and two atoms of oxygen, whilst CO has one carbon and one oxygen atom.
What does the latent heat of fusion measure?
Answer:
The energy required to change the phase of a substance is known as a latent heat.
Explanation:
The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporisation which measures the heat energy to change 1 kg of a solid into a liquid. hope this helps you :)
Answer & Explanation:
The energy required to change the phase of a substance is known as a latent heat. ... The energy require is Q= m L, where m is the mass of the substance and L is the specific latent heat of fusion or vaporization which measures the heat energy to change 1 kg of a solid into a liquid.
Indicate the bonding type in each of the following compound CsBr
Answer:
Ionic bonding
Explanation:
A bond between a metal and a non-metal is an ionic bond and Since, Cesium is a metal and Bromine is a non-metal, It form the bond called Ionic Bond.
hi :) how to test if a solution is neutral?
Explanation:
solution is neutral because it added water and water is neutral solution
The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement? The enthalpy of the products is equal to the enthalpy of the reactants. Heat is absorbed during the process. Heat is released during the process. The enthalpy of the products is more than the enthalpy of the reactants.
Answer:
Heat is released during the process.
Explanation:
From the information provided in question, the enthalpy of formation of water is –285.8 kJ/mol. This is simply an exothermic reaction.
The negative sign indicates that the enthalphy of the reactants is more than the enthalphy of the products and as such, heat is released from the system into the surroundings.
The enthalpy of formation of water is –285.8 kJ/mol means that heat is released during the process.
What is enthalpy of formation of a substance?The enthalpy of formation of a substance is the amount of heat given off or absorbed when one mole of a substance is formed from the reactants.
A positive value for enthalpy means the reaction is endothermic while a negative value for enthalpy means the reaction is endothermic.
Therefore, the enthalpy of formation of water is –285.8 kJ/mol means that the reaction is exothermic and heat is released during the process.
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Water has a density of 1.0 g/ml and a test liquid has density of 1.1 g/ml. If you pour equal portions of the two liquids into a cup,what will happen ( assuming the two do not mix or create a chemical reaction)?
Answer:
Since the test liquid is denser than water, theoretically the test liquid would sink, but since the difference is so minor, the liquid poured after may float on top of the other liquid.
Explanation:
Answer:the test liquid will be on top.
Explanation:the test liquid has a higher density(1.1g/mol) than that of the water with density (1.0g/mol)
a sample of 23.2 grams of nitrogen gas is reacted with 23.2 G of hydrogen gas to produce ammonia. using the balanced equation below predict which of the reactants is the limiting reactant
Answer:
Hydrogen
Explanation:
First thing's first, we have to write out the balanced chemical equation for the reaction.
This is given as;
N2 + 3H2 --> 2NH3
From the stoichiometrey of the reaction;
Molar mass of N = 14
Molar mass of H = 1
(1 * (14 * 2)) = 28g of N2 reacts with (3 * (1 * 2)) = 6g of H2
This means that if there are equal mass of both Nitrogen and Hydrogen. We would run out of Hydrogen first. This means Hydrogen is our limiting reactant as it determines the amount of products that can be formed.
Determine the new pressure of a sample of hydrogen gas if the volume and moles are constant, the initial pressure is 6.0 atm, and it is heated from 15°C to 30.°C. PLEASE HELP ASAP! THANK U SO MUCH!
6.3 atm
5.7 atm
12 atm
3.0 atm
Answer:
6.3 atm.
Explanation:
Data obtained from the question include:
Initial pressure (P1) = 6 atm
Initial temperature (T1) = 15°C = 15°C + 273 = 288K
Final temperature (T2) = 30°C = 30°C + 273 = 303K
Final pressure (P2) =..?
Since the volume and number of mole of the hydrogen gas sample is constant, the following equation will used to obtain the new pressure:
P1/T1 = P2/T2
6/288 = P2 /303
Cross multiply
288 x P2 = 6 x 303
Divide both side by 288
P2 = (6 x 303) /288
P2 = 6.3 atm
Therefore, the new pressure of the hydrogen gas sample is 6.3 atm.
Number of
Protons
Number of
Neutrons
Atomic
Number
Mass
Number
Element
(symbol)
4.
2.
A
B
D
12
10
F
Using the periodic table, complete the table to describe each atom. Type in your answers.
A
B
C
D
E
F
Answer:1:En química, el número másico o número de masa es la suma del número de protones y el número de neutrones del núcleo de un átomo. Se simboliza con la letra A (el uso de esta letra proviene de alemán Atomgewicht, que quiere decir peso atómico, aunque sean conceptos distintos que no deben confundirse).
2: