Answer:
Then, at some point, these higher energy electrons give up their "extra" energy in the form of a photon of light, and fall back down to their original energy level.
Explanation:
When properly stimulated, electrons in these materials move from a lower level of energy up to a higher level of energy and occupy a different orbital.
Consider the balanced chemical equation . How many moles of H 2O are produced when 1.0 mole of C 2H 6 reacts with excess O 2
Answer:
3.0 mol H₂O
Explanation:
Step 1: Write the balanced combustion equation
C₂H₆ + 3.5 O₂ ⇒ 2 CO₂ + 3 H₂O
Step 2: Establish the appropriate molar ratio
The molar ratio of C₂H₆ to H₂O is 1:3.
Step 3: Calculate the moles of H₂O formed from 1.0 mole of C₂H₆
1.0 mol C₂H₆ × 3 mol H₂O/1 mol C₂H₆ = 3.0 mol H₂O
En un estudio de contaminantes, se cuantificó que el martes anterior se tenían 40 ppm de dióxido de carbono en el ambiente estudiado. Mientras que el jueves se reportó que se tenía 0.004% de esa misma sustancia. ¿Cómo se comparan estos valores?
A.
Las concentraciones no pueden compararse debido a que tienen diferentes unidades.
B.
Las concentraciones son iguales, por lo que se deben monitorear las causas en los dos días.
C.
El jueves hay mayor concentración de contaminante, por lo que se deben tomar medidas únicamente para ese día.
D.
El martes hay mayor concentración de contaminante, por lo que se deben tomar medidas únicamente para ese día.
How many liters of hydrogen can be produced at a pressure of 2 atm and a temperature of 298 K?
Answer: A volume of 1.16 L hydrogen is produced at a pressure of 2 atm and a temperature of 298 K.
Explanation:
Given: Mass of Mg = 2.3 g
Pressure = 2 atm
Temperature = 298 K
The reaction equation is as follows.
[tex]Mg + 2HCl \rightarrow MgCl_{2} + H_{2}[/tex]
This shows that 1 mole of Mg gives 1 mole of [tex]H_{2}[/tex].
Hence, moles of Mg for the given mass is calculated as follows.
[tex]Moles = \frac{mass}{molar mass}\\= \frac{2.3 g}{24.30 g/mol}\\= 0.095 mol[/tex]
Hence, 0.095 moles of Mg will give 0.095 moles of [tex]H_{2}[/tex].
Formula used to calculate volume is as follows.
PV = nRT
where,
P = pressure
V = volume
n = no. of moles
R = gas constant = 0.0821 L atm/mol K
T = temperature
Substitute the values into the above formula as follows.
[tex]PV = nRT\\2 atm \times V = 0.095 mol \times 0.0821 L atm/mol K \times 298 K\\V = \frac{0.095 mol \times 0.0821 L atm/mol K \times 298 K}{2 atm}\\= 1.16 L[/tex]
Thus, we can conclude that a volume of 1.16 L hydrogen is produced at a pressure of 2 atm and a temperature of 298 K.
Where would (aq) (s) go in Cr(NO3)3+K3PO4
Answer:
Cr(NO3)3 (aq) +K3PO4 (s)
Explanation:
The combustion of gasoline produces carbon dioxide and water. Assume gasoline to be pure octane (C8H18) and calculate the mass (in kg) of carbon dioxide that is added to the atmosphere per 1.0 kg of octane burned
Answer:
3.1 kg
Explanation:
Step 1: Write the balanced combustion equation
C₈H₁₈ + 12.5 O₂ ⇒ 8 CO₂ + 9 H₂O
Step 2: Calculate the moles corresponding to 1.0 kg of C₈H₁₈.
The molar mass of C₈H₁₈ is 114.23 g/mol.
1.0 × 10³ g × 1 mol/114.23 g = 8.8 mol
Step 3: Calculate the moles of CO₂ produced from 8.8 moles of C₈H₁₈
The molar ratio of C₈H₁₈ to CO₂ is 1:8. The moles of CO₂ produced are 8/1 × 8.8 mol = 70 mol.
Step 4: Calculate the mass corresponding to 70 moles of CO₂
The molar mass of CO₂ is 44.01 g/mol.
70 mol × 44.01 g/mol = 3.1 × 10³ g = 3.1 kg
 Help ASAP only right answers only no spam don’t answer if you don’t know
i know the answer is a theory
9. Explain why you can't write the formula of the ionic compound that forms between Fe
and S?
Answer:
See explanation
Explanation:
According to Fajan's rules, the degree of covalent character of a bond depends on the relative polarizing power of ions.
Generally, ions become more polarizing when they are small and highly charged. Large negative ions are more polarizable than small ones.
A very small positive charge concentrated on a small area such as in Fe^2+ makes the ion highly polarizing. Also, a large negative ion such as S^2- is highly polarizable.
As a result of these FeS has considerable covalent character hence we can not simply write the formula of the ionic compound that forms between Fe and S?
One way of purifying gaseous H2 is to pass it under high pressure through the holes of a metal's crystal structure. Palladium, which adopts a cubic closest packed structure, absorbs more H2 than any other element and is one of the metals currently used for this purpose. Although the metal-hydrogen interaction is unclear, it is estimated that the density of absorbed H2 approaches that of liquid hydrogen (70.8 g/L). What volume (in L) of gaseous H2, measured at STP, can be packed into the spaces of 1 dm3 of palladium metal
Answer:
[tex]V=795.26L[/tex]
Explanation:
From the question we are told that:
Volume [tex]V=1dm^3=>1L[/tex]
Density [tex]\rho=70.8g/L[/tex]
Generally the equation for Density is mathematically given by
[tex]\rho =\frac{Mass}{Volume}[/tex]
Therefore
[tex]M=\rho*V[/tex]
[tex]M=70.8*1[/tex]
[tex]M=70.8g[/tex]
Since at STP
[tex]T=273K[/tex]
[tex]P=1atm[/tex]
[tex]Mass =70.8g[/tex]
Therefore
[tex]Moles\ of\ Hydrogen=\frac{Mass}{2g}[/tex]
[tex]Moles\ of\ Hydrogen=\frac{70.8}{2g}[/tex]
[tex]Moles\ of\ Hydrogen=35.4moles[/tex]
Generally the equation for Ideal gas is mathematically given by
[tex]PV=nRT[/tex]
Therefore
[tex]V=\frac{nRT}{P}[/tex]
[tex]V=\frac{35.4*0.0826*273}{1}[/tex]
[tex]V=795.3L[/tex]
True or false, If an atom is charged negative, it contains more electrons than protons.
Answer:
True
Explanation:
An atom would carry more protons if positively charged, an equal amount of both protons and electrons if neutral, and more electrons if charged negative.
Select the correct text in the passage.
Explanation:
Oceans can influence weather and climate. For example, cities located near large water bodies like oceans tend not to have extreme climates
a) The bubbles must be negatively charged.
b) The bubbles must be positively charged.
c) The bubbles must have the opposite charge to the charge on the student.
d) The bubbles must have the same charge as the charge on the student.
Answer:
C
Explanation:
like charges repel each others so if they have the same charge they will move away from each other
Write a Lewis structure that obeys the octet rule for each molecule or ion. Include resonance structures if necessary and assign formal charges to each atom.
Answer:
A structure that obeys the octet rule for each molecule or ion is [tex]XeO_4[/tex]
Explanation:
Here in [tex]XeO_4[/tex] , Xenon has 8 valence electrons and each oxygen atom has 6 valence electrons
Lewis structure for [tex]XeO_4[/tex] is shown below :
Here , all atoms are having their complete octet .
All the atoms in this Lewis structure is having their complete octet .
Resonance structure is not required as all atoms are same that is oxygen .
the chemicals used in the preparation of carbondioxide gas are???
Answer:
Calcium carbonate and hydrochloric acid
Explanation:
The reaction of Calcium carbonate and Hydrochloric acid leads to the formation of Calcium Chloride and Carbon (IV) Oxide gas.
CaCO3 + 2HCl => CaCl2 + CO2 + H2O
Ginger wanted to see how long it would take to get to Brownsville from Houston. If it is 570 kilometers (km) to Brownsville, how long would it take her if she could only drive an average speed of 60 km/hour
Answer:
9.5 hours/ 9 hours 30 mins
Explanation:
Distance = speed × time so
Time = Distance ÷ speed
= 570 ÷ 60
= 9.5 hours
which organ is used to detect the product of neutralisation reaction
Answer:
Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water.
The organ that is used to detect the product of a neutralization reaction is the sense of taste.
When a neutralization reaction occurs between an acid and a base, it results in the formation of a salt and water. The salt produced in the reaction may have a distinct taste, depending on its chemical properties. For example, when hydrochloric acid reacts with sodium hydroxide, the products are sodium chloride and water. Sodium chloride, commonly known as table salt, has a characteristic salty taste.
Similarly, other salts formed from neutralization reactions may have different tastes. For instance, magnesium hydroxide reacting with acetic acid produces magnesium acetate, which has a slightly sweet taste. By using our taste buds, particularly on the tongue, we can detect and identify the taste of the salt formed during a neutralization reaction.
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14. Which of the following alkanols on oxidation is most likely to yield the
compound below?
CHICHICOOON
.CO
(A) Butanol (B) Propan-2-ol(2-methylbutan-1-ol (D) 2-methylpropan-1-
ol (E) 2-methylpropan-2-ol.
Answer:
A
Explanation:
I think that is the ans but am not sure
Answer:
2-methylpropan-1-ol.
Explanation:
[tex]{ \tt{CH _{3}CH(CH _{3})CH _{2}OH}}[/tex]
A toy plane has a mass of 2.5kg and is 18 m above the ground. It is moving 4.5 m/s.
how much mechanical energy does the toy have?
A. 416J
B. 441J
C. 466J
D. 491J
Answer:
466J (c)
Explanation:
Mechanical Energy= Kinetic+Potential
Potential energy= mgh
Plug in givens
mgh=2.5*18*9.8=441J
Kinetic Energy = 1/2mv^2
Plug in givens
1/2mv^2= 1/2(2.5)(4.5)^2= 25.3125J
Mechanical energy= 441J+25.3125J=466.3125J or 466J
Select the structure that corresponds
to the name:
decanoic acid
COOH
A.
B. CH3(CH2)7COOH
C. both
Answer:
b
Explanation:
Molecular formula of Decanoic Acid is C₁₀H₂₀O₂ therefore Option A is the right answer.
What is Decanoic Acid ?Decanoic Acid is a C10 , straight chain , saturated fatty acid . Its general formula is C₁₀H₂₀O₂ .
In the first option we can see a straight chain , saturated fatty acid and the molecular formula is also same as decanoic acid .
In second option the molecular formula is C₉H₁₈O₂ which is not same as Decanoic Acid.
Hence option A is the right answer.
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cuantos gramos y moleculas de dioxido de carbono hay en 0.5 moles de dioxido de carbono
paso a paso
Answer:
metro= 22g
Explanation:
in heating a kettle of water on an electric stove, 3.34×10^3 J of thermal energy was provided by the element of the stove. yet, the water in the kettle gained only 5.95×10^2 J of thermal energy. determine the percent efficiency of the electrical element in heating the kettle of water
Answer:
The percentage efficiency of the electrical element is approximately 82.186%
Explanation:
The given parameters are;
The thermal energy provided by the stove element, [tex]H_{supplied}[/tex] = 3.34 × 10³ J
The amount thermal energy gained by the kettle, [tex]H_{absorbed}[/tex] = 5.95 × 10² J
The percentage efficiency of the electrical element in heating the kettle of water, η%, is given as follows;
[tex]\eta \% = \dfrac{H_{supplied} - H_{absorbed} }{H_{supplied}} \times 100[/tex]
Therefore, we get;
[tex]\eta \% = \dfrac{3.34 \times 10^3 - 5.95 \times 10^2}{3.34 \times 10^3} \times 100 = \dfrac{549}{668} \times 100 \approx 82.186 \%[/tex]
The percentage efficiency of the electrical element, η% ≈ 82.186%.
Options ^
QUESTION:
Which of the following choices will an atom of sodium (Na) be most likely to bond with?
Answer:
A. 2 chlorine (Cl) atoms
Explanation:
2 chlorine atoms means that chlorine is a gas.
Sodium (Na) reacts with 2 chlorine atoms according to the equation below;
Na(s) + Cl2(g) => NaCl2
Answer:
fluorine is what its looking for
Explanation:
A gas is put into a cosed container.
The container and the gas inside it are heated.
What will happen to the pressure inside the container?
Answer:
When gases in containers are heated, their molecules increase in average speed. This means that they exert a greater force when they collide with the container walls, and also collide with the walls more frequently. The gas is therefore under greater pressure when its temperature is higher.
How many bonds can a carbon atom form?
O A. 1
B. 2
C. 4
O D. 3
3. According to the Arrhenius theory, which list of compounds includes only acids?
A) HF, H2CO3, and HNO3
B) LiOH, HNO3, and CH3OH
C) H2PO4, HCO3, and NH4Cl
D) HNO3, H2SO4, and C6H12O6
Answer:
C) H2PO4, HCO3, NH4Cl
Explanation:
Because all of the above compounds on reaction with water liberate H+ ion which is the identification of an acid acc to Arhenius Theory
During a process called photoact, ________ give up an electron as a part of the light-dependent reactions.
Answer:
Chloroplasts?
Explanation:
Oxygen is a diatomic element.why give reason.
Answer:
Diatomic molecules contain two atoms that are chemically bonded. If the two atoms are identical, as in, for example, the oxygen molecule (O2), they compose a homonuclear diatomic molecule, while if the atoms are different, as in the carbon monoxide molecule (CO), they make up…
Explanation:
yei hoo arko aaxaina ...
the sum of two numbers is 54 one exceed the other by 14 find the number
Answer:
x=34
y=20
Explanation:
let the first number be 'x'
let the second number be 'y'
Equation 1:-
x + y = 54
Equation 2:-
x = y + 14 (Since one exceeds the other by 14)
Substituting Equation 2 in Equation 1:-
(y + 14) + y = 54
=> y + 14 + y = 54
=> 2y + 14 = 54
=> 2y = 54 - 14
=> 2y = 40
=> y = 40/2
=> y = 20
Now in Equation 1:-
x + y = 54
Substituting y=20,
x + 20 = 54
x = 54 - 20
x = 34
What is the difference between a continuous spectrum and a line spectrum? Give a source of each
kind of spectrum!
9. During a titration, 50.0 ml of 0.2M NaOH were required to neutralize 50.0ml of H_{3}*P * O_{4} What's the concentration of the H_{3}*P * O_{4} solution?
Answer:
0.067M H3PO4
Explanation:
H3PO4 reacts with NaOH as follows:
H3PO4 + 3NaOH → 3H2O + Na3PO4
Where 1 mole of H3PO4 reacts with 3 moles of NaOH
To solve trhis question we need to find the moles of NaOH required. With the chemical equation we can find the moles of H3PO4 and its concentration as follows:
Moles NaOH:
50.0mL = 0.0500L * (0.20moles /L) = 0.0100 moles NaOH
Moles H3PO4:
0.0100 moles NaOH * (1mol H3PO4 / 3mol NaOH) = 0.00333 moles H3PO4
Concentration:
0.00333 moles H3PO4 / 0.0500L = 0.067M H3PO4
Hematite is a naturally occurring mineral and a common form of iron ore. The following statements describe physical and chemical changes occurring to hematite. Which statement describes a chemical change?
When the hematite particles rearrange to form a new substance", this statement describes chemical change.
What is chemical change ?A chemical change is a change of materials into another, new materials with different properties and one or more than one new substances are formed.
As a chemical changes is usually a change where a substance undergoes a chemical change and forms a new substance; which cannot be easily reversed into reactants by any simple physical methods.
In this example the hematite ore forms a new substance by an irreversible chemical change.
Hence, "The hematite particles rearrange to form a new substance", this statement describes chemical change.
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