Answer:
- 1300 kJ.
Explanation:
We should modify the given two reactions to reach to the final reaction:We should reverse the first reaction and so multiply its ΔH by (- 1):
P₄O₆(s) → P₄(s) + 3O₂(g), ΔH₁' = 1640.1 kJ.
The second reaction also should be reversed and so multiply its ΔH by (- 1):
P₄(s) + 5O₂(g) → P₄O₁₀(s), ΔH₂' = - 2940.1 kJ.
If we add the two reactions after modification, we get:
P₄O₆(s) → P₄O₁₀(s).
∴ ΔH = ΔH₁' + ΔH₂' = 1640.1 kJ + (- 2940.1 kJ) = - 1300 kJ.
Answer:
answer is -1300 on edge 2021
Explanation:
What is the change in atomic mass when an atom emits a beta particle? Please explain your answer
no significant change
decreases by 2
decreases by 1
increases by 1
no significant change
Explanation:
When an atom emits a beta particle, a neutron is changed into a proton by emitting an electron. The electron has a negligible mass (very small), hence there is no significant change in atomic mass.
Latoya performs an experiment using the lab equipment shown. Which two properties is Latoya most likely measuring?
Answer: Volume and temperature
Explanation:
Answer:
volume and temperature
Explanation:
How are the colors in neon signs changed?
Answer:
Neon lights don't actually change colors.
Explanation:
Neon signs give the illusion of changing color by turning different components of the signs on or off.
Answer:
The color of the light depends on the gas in the tube. Neon lights were named for neon, a noble gas which gives off a popular orange light, but other gases and chemicals are used to produce other colors, such as hydrogen (red), helium (yellow), carbon dioxide (white), and mercury (blue).
Explanation:
those are all the color signs i know this because i did it before
A sample of gas in a balloon has an initial temperature of 20. ∘C and a volume of 1.92×103 L . If the temperature changes to 68 ∘C , and there is no change of pressure or amount of gas, what is the new volume, V2, of the gas?
Answer:
[tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex]
Explanation:
The pressure is constant, so we can use Charles' Law.
[tex]\dfrac{ V_{1} }{T_{1}} = \dfrac{ V_{2} }{T_{2}}[/tex]
Data:
V₁ = 1.92 × 10³ L; T₁ = 20 °C
V₂ = ?; T₂ = 68 °C
Calculations:
(a) Convert temperatures to kelvins
T₁ = (20 + 273.15) K = 293.15 K
T₂ = (68 + 273.15) K = 341.15 K
(b) Calculate the volume
[tex]\dfrac{ 1.92 \times 10^{3}}{293.15} = \dfrac{ V_{2}}{341.15}\\\\6.550 = \dfrac{ V_{2}}{341.15}\\\\V_{2} = 6.550 \times 341.15 = 2.23 \times 10^{3} \text{ L}[/tex]
The new volume of the gas is [tex]\boxed{2.23 \times 10^{3} \text{ L}}[/tex].
100 ml of gaseous hydrocarbon consumes 300
ml of oxygen for the complete combustion.
The hydrocarbon is
a. C2H4
b. C2H2
C. C3H8
d. C2H6
The answer would be a. C2H4(ethylene)
1C2H4+3O2~>2CO2+2H2O
Answer:
a. C2H4.
Explanation:
Let's look at the balanced equation for C2H4.
C2H4 + 3O2 --> 2CO2 + 2H2O
So 1 mole of this hydrocarbon reacts with 3 moles of oxygen and since 1 mole of one gas occupies the same volume as another gas, the volumes will be in the ratio 1:3. So this is the required hydrocarbon.
the number of protons and neutrons in an atom is known as the
A.) isotope. B.) atomic number. C.) mass number. D.) energy level.
Answer:
Its B. Just look at google.
Answer:
The number of protons and neutrons in an atom is known as the mass number. C.)
which of the following statements about natural resources is correct
solar power produces harmful chemicals
geothermal power requires more land than other power plants
nuclear power produces small amounts of energy from large masses
wind power requires a lot of space and depends on local weather patterns
Answer:
The right choice is "wind power requires a lot of space and depends on local weather patterns "
Explanation:
solar power produces harmful chemicals it is incorrect because solar power doesn't produce any chemicals2. geothermal power requires more land than other power plants
it is incorrect because geothermal power requires digging a stable 5 km-deep shaft not a land3. nuclear power produces small amounts of energy from large masses
it is incorrect because nuclear power produces large amounts of energy from small masses.So the right choice is "wind power requires a lot of space and depends on local weather patterns "
In your own words describe the process of a physical change
Answer:
Explanation:
The changes that matter undergoes are associated with properties.
A physical change is one that alters the physical properties of matter. The physical properties of matter tells us everything about what a substance is when no change is occurring to its constituents. Such properties can be observed with our senses or instruments or pieces of apparatus. Examples are state of matter, colour, odour, taste, texture etc.
In many ways, physical changes are easily reversible and required little energy to initiate. There is no change in mass and no new kinds of matter are produced.
Examples of physical changes are boiling, melting, freezing, condensation, sublimation, magnetization of metals, breaking of glass, cutting of wood.
Plz Help! If 0.0025 mol NaNO3 forms during the reaction, what is the concentration of NaNO3 in the final solution?
Please give a step-by-step solution to this problem.
Answer:
Hi! I hope this will help
you with your question, whether this is an assignment or not. The answer that I
get is 0.033 concentration.
If 0.0025 mol NaNo3 forms
during the reaction, the concentration of NaNO3 in the final solution should be
0.033.
The concentration of NaNO₃ in the final solution, considering the sum of the given volumes, is approximately 0.276 M.
To find the concentration of NaNO₃ in the final solution, we need to know the volume of the solution. However, since it's not provided in the question or the additional information, we'll assume that the final volume of the solution is the sum of the volumes given in the reference information (0.2L from Na+ and 50mL + 40mL for NO₃).
Step 1: Convert mL to Liters for NO₃ since the concentrations are in Molarity (moles/liter). Therefore, the total volume in liters is 0.2L + 0.05L + 0.04L = 0.29L.
Step 2: We know from the information given that 0.08 mol of NaNO3 is produced. Since this is less than the stated 0.0025 mol, we will use 0.08 mol as the correct value.
Step 3: Calculate the concentration in moles/Liter (Molarity) using the formula C = n/V, where 'C' is concentration, 'n' is the number of moles, and 'V' is the volume in liters. This gives us C = 0.08 mol / 0.29 L = approx 0.276 M NaNO₃.
The concentration of NaNO₃ in the final solution is approximately 0.276 M.
which of the following describes the movements of electrons
Answer:
What are the options?
Explanation:
I'll need to know the options in order to answer that.
what is mascara made out of?
Answer: most contain the same basic components of pigments, oils, waxes, and preservatives.
Explanation: YOOOO was up :))))))
convert 6.35 grams of aluminum sulfate to moles
Answer:
There are 0.0186 moles of formula units in 6.35 grams of aluminum sulfate [tex]\rm Al_2(SO_4)_3[/tex].
Explanation:
What's the empirical formula of aluminum sulfate?
Sulfate is an anion with a charge of -2 per ion. When sulfate ions are bonded to metals, the compound is likely ionic.
Aluminum is a group III metal. Its ions tend to carry a charge of +3 per ion.
The empirical formula of an ionic compound shall balance the charge on ions with as few ions as possible.
The least common multiple of 2 and 3 is 6. That is:
Three sulfate ions [tex]\rm {SO_4}^{2-}[/tex] will give a charge of -6. Two aluminum ions [tex]\rm Al^{3+}[/tex] will give a charge of +6.Pairing three [tex]\rm {SO_4}^{2-}[/tex] ions with two [tex]\rm Al^{3+}[/tex] will balance the charge. Hence the empirical formula: [tex]\rm Al_2(SO_4)_3[/tex].
What's the mass of one mole of aluminum sulfate? In other words, what's the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]?
Refer to a modern periodic table for relative atomic mass data:
Al: 26.982;S: 32.06;O: 15.999.There are
two Al, three S, andtwelve Oin one formula unit of [tex]\rm Al_2(SO_4)_3[/tex].
Hence the formula mass of [tex]\rm Al_2(SO_4)_3[/tex]:
[tex]\underbrace{2\times 26.982}_{\rm Al} + \underbrace{3\times 32.06}_{\rm S} + \underbrace{12\times 15.999}_{\rm O} = \rm 342.132\;g\cdot mol^{-1}[/tex].
How many moles of formula units in 6.35 grams of [tex]\rm Al_2(SO_4)_3[/tex]?
[tex]\displaystyle n = \frac{m}{M} = \rm \frac{6.35\;g}{342.132\;g\cdot mol^{-1}} = 0.0186\;mol[/tex].
The Mole #2
Avogadro's Number
PLEASE HELP ASAP! due tmr will give brainliest!
The solution is here,
given mass of copper wire(m)=25 g
no. of moles in given mass of Cu=0.393
a) no. of atoms= no. of moles×avogardo's number
=0.393×6.023×10^23=2.36 ×10^23 atoms
b) 25 g of Cu wire has 0.393 moles
so 200 g of Cu wire has 0.393/25 × 200=3.144 mol.
no. of atoms= 3.144×2.023×10^23=1.89×10^24 atoms.
c) 25 g of Cu wire has 2.36×10^23 atoms
so 5 g of Cu wire has (2.36×10^23)/25 × 5
=4.72×10^22 atoms
( b can also be solve like c)
What did Ernest Rutherford’s gold foil experiment demonstrate about atoms ?
Answer:
Their positive charge is located in the small nucleus
Explanation:
Ernest Rutherford performed the gold foil experiment in 1911 where he used alpha particles generated from a radioactive source to bombard a thin gold foil.
In his experiment, he observed that the bulk of the alpha particles passed through the gold foil, just a tiny fraction was deflected back. To explain his findings, Rutherford proposed that an atom is made of positively charged centre where nearly all the mass is concentrated called nucleus. Surrounding the nucleus is a large space containing electrons.
He discovered that other than the nucleus at the center, atoms are mostly just empty space. So A makes the most sense.
Need help on this ASAP !!!!
Answer:
2:2
Explanation:
The question is on mole ration in a chemical equation.
Steps to identify mole ratio in an equation
Write a balance chemical equation-atoms of elements in the reactant side should equal that of the product side2H₂ + O₂⇒ 2H₂O------------------This equation is balanced. how?
Number of hydrogen atoms in reacting side= 2×2=4
Number of hydrogen atoms in the products side= 2×2=4
Number of oxygen atoms in the reacting side=2
Number of oxygen atoms in the product side =2
Writing the mole ratio in the equation
2H₂ + O₂⇒ 2H₂O
2 1 2
Mole ratio of hydrogen to water
2H₂ + O₂⇒ 2H₂O
2 2
= 2:2
A toaster transforms electrical energy into _____ energy and _____ energy. A. heat; light B. heat; kinetic C. heat; potential D. kinetic; potential
A. heat; light energies
Answer:
the answer is A; firstly heat then heat light.
For a phase change, H = -44 kJ/mol and SO = -0.12 kJ/(K•mol). What are
G and the spontaneity of the phase change at 350 K?
Answer:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
Explanation:
∵ ΔG = ΔH - TΔS,
ΔH = - 44.0 kJ/mol, T = 350.0 K, ΔS = - 0.12 kJ/K.mol.
∴ ΔG = ΔH - TΔS = (- 44.0 kJ/mol) - (350.0 K)(- 0.12 kJ/K.mol) = - 2.0 kJ/mol.
The sign of ΔG assigns the spontaneity of the reaction:
If ΔG is negative: the reaction is spontaneous.If ΔG = 0, the reaction is at equilibrium.If ΔG is positive: the reaction is non-spontaneous.∵ ΔG has a negative value, so the reaction is spontaneous.
So, the answer is:
ΔG = - 2.0 kJ/mol and the reaction is spontaneous.
Among the four ecosystems, is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be .
Species will be four secondary and tertiary consumers will be 25
Explanation-
Given in the question the number of species is 4 then it will have 8 primary 10 secondary and 10 tertiary consumers. If this number of primary consumers increases from 8 to 20 consumers then the number of species involved would be 10 { 4x20/8 }
Number of secondary consumers would also be increased and increased value would be 25 { 10x20/8 } then again comes the tertiary number of consumer which also increases. The number of tertiary consumers will increase to 25 { 10x20/8} same as secondary.
Among the four ecosystems, ecosytem 3 is the most diverse. In the second ecosystem, there are 4 species of producers, 8 primary consumers, 10 secondary consumers, and 10 tertiary consumers. If the number of species of primary consumers in the second ecosystem increases to 20, there will be fewer producers in the ecosystem.
A drum Can begin to vibrate at its natural frequency without being struck through:
A. Refection
B.diffraction
C.refraction
D. Resonance
Answer IS D!!
Answer:
[tex]\boxed{\text{D. Resonance}}[/tex]
Explanation:
If an external vibration matches the drum's natural frequency, it will induce the can to vibrate. This is an example of resonance.
It is analogous to pumping your legs in synchronization with a swing's natural frequency.
what is the volume of 12.0 grams of oxygen gas at STP
Atomic mass:O = 15.99 grams/moles
Answer:
16.82 L.
Explanation:
We can use the general law of ideal gas: PV = nRT.where, P is the pressure of the gas in atm (P = 1.0 atm, STP conditions).
V is the volume of the gas in L (V = ??? L).
n is the no. of moles of the gas in mol (n = mass/molar mass = (12.0 g)/(15.99 g/mol) = 0.7505 mol).
R is the general gas constant (R = 0.0821 L.atm/mol.K),
T is the temperature of the gas in K (T = 0.0°C + 273 = 273.0 K, STP conditions).
∴ V = nRT/P = (0.7505 mol)(0.0821 L.atm/mol.K)(273.0 K)/(1.0 atm) = 16.82 L.
Which is a sustainable practice? A. Wind farms B. Clear cutting C. Flood irrigation D. Overfishing
When a practice is sustainable, it means that it can be used over and over through time. Sustainable practices also benefit, rather than harm, the environment. Though it really depends on where you live, the general answer for this would be wind farms since flood irrigation can only happen in certain conditions. Overfishing would destroy a species over time, and clear cutting is obviously harmful to the environment.
The sustainable practice can be described as one that can be seen in A. Wind farms . option A is correct.
What is sustainable practice?It has the capacity to be maintained, upheld, or affirmed. Science of the environment. the property of not being environmentally destructive or depleting natural resources, promoting long-term ecological balance: The committee is creating sustainability criteria for energy-using products.
Sustainable practices promote the health and vitality of the environment, people, and the economy. According to sustainability, resources are limited and should be used prudently with an eye toward long-term goals and the effects of how they are used.
Hence , option A is correct.
Learn more about sustainable practice at;
https://brainly.com/question/20203650
#SPJ6
Can someone help me with Geography connection plz.
Hello There!
South of the equator, some crops grown were beans, cotton, peanuts, peppers, potatoes, coffee, millet and yams
Select all that apply. The density of an object is 0.950 g/cm3. It will float in which of the following materials? water, density = 1.00 g/cm3 olive oil, density = 0.920 g/cm3 ethyl alcohol, density = 0.789 g/cm3 citric acid, density = 1.660 g/cm3
Answer:
The object will float in water and citric acid.
Explanation:
The density of an object indicates if the object will sink or float in another substance:The object will float, if it is less dense than the substance it is placed in.
The object will sink, if it is more dense than the substance it is placed in.
The object has density of (0.95 g/cm³) is less dense than water (density = 1.00 g/cm³) and citric acid (density = 1.660 g/cm³), so it will float in water and citric acid.The object has density of (0.95 g/cm³) is more dense than olive oil (density = 0.920 g/cm³) and ethyl alcohol (density = 0.789 g/cm³), so it will sink in olive oil and ethyl alcohol.So, the object will float in water and citric acid.
Compare the densities of hydrogen, oxygen, and water.
Answer:
Water is a compound made up of two elements—hydrogen and oxygen. ... They are both colorless, odorless gases , and they both readily react with other elements—making them "reactive" elements. But in many ways they are very different from each other. Hydrogen has the lowest density of all the elements.
Consider the chemical equations shown here.
2Na(s) + Cl2(g) → 2NaCl(s)
4Na(s) + O2(g) → 2Na2O(s)
What is the overall equation for the reaction that produces NaCl and O2 from Na2O and Cl2?
Na2O(s) + Cl2(g) --> NaCl(s) + O2(g)
2Na2O(s) + Cl2(g)--> 2NaCl(s) + O2(g)
2Na2O(s) + 2Cl2(g)--> 4NaCl(s) + O2(g)
Answer:
2Na₂O₍s₎+ 2Cl₂₍g₎⇒4 NaCl₍s₎ +O₂₍g₎
Explanation:
The more reactive chlorine gas displaces the less reactive oxygen gas from the compound sodium oxide. The correct equation is C. because the number of each type atom on each side is equal hence the equation is balanced. There are 4 sodium atoms on the left side as there are on the right, 4 chlorine on both sides and two oxygen on both sides.
Answer : The correct equation will be,
[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]
Explanation :
The given reactions are:
(1) [tex]2Na(s)+Cl_2(g)\rightarrow 2NaCl(s)[/tex]
(2) [tex]4Na(s)+O_2(g)\rightarrow 2Na_2O(s)[/tex]
Both the given chemical reactions are balanced chemical reaction. So, in order to get the final equation we first multiply equation 1 by 2 and reverse the equation 2 then add both the equations, we get the overall equation for the reaction the produces [tex]NaCl[/tex] and [tex]O_2[/tex] from [tex]Na_2O[/tex] and [tex]Cl_2[/tex]
(1) [tex]4Na(s)+2Cl_2(g)\rightarrow 4NaCl(s)[/tex]
(2) [tex]2Na_2O(s)\rightarrow 4Na(s)+O_2(g)[/tex]
The final reaction will be,
[tex]2Na_2O(s)+2Cl_2(g)\rightarrow 4NaCl(s)+O_2(g)[/tex]
How is acid rain produced ?
Answer:
acid rain is produced from harmful emissions in the air clinging to the water molecules and coming down as rain
Explanation:
The type of acid rain that contains water is called wet deposition. Acid rain formed with dust or gasses is called dry deposition.
A scientist has three liquids in a beaker. Liquid 1 is the top layer, liquid 2 is the middle layer, and liquid 3 is the bottom layer. Write the order of the liquids from most dense to least dense.
Answer:
3>2>1
Explanation:
Liquid 3 is the densest and liquid 1 is the least dense of all. Liquid 2 would be in the middle as its density lies between that of liquids 1 and 3.
Density can be defined as the mass per unit volume of a liquid.
The more the mass the greater the density. Density increases with increasing mass of solute. We see that density shares a direct proportionality with mass.
In terms of volume, the more the volume of solvents the lesser the density. When we dilute some solutions, we tend to reduce their density. Density shares an inverse relationship with volume.
The densest solutions would go below while the least dense goes up.
Which of the following is not present in an atom?
Electron
Element
Neutron
Proton
Answer:
Element
Explanation:
since electron,neutron,and proton are inside of an atom, the answer would be elements, since elements are made up of atoms, but not present in the atom itself.
Answer:
b
Explanation:
Isotopes are separated by
A. crystallisation
B. sublimation
C. distillation
D. filtration
In an atomic explosion, enormous energy is released which is due to
A. conversion of chemical energy into heat energy
B. conversion of mechanical energy into nuclear energy
C. conversion of mass into energy
D. conversion of neutrons into protons
Which among the following is a positively charged particle emitted by a radioactive element?
A. Beta ray
B. Alpha ray
C. Cathode ray
D. Gamma ray
Answer:
1. C. distillation
2. B. conversion of mechanical energy into nuclear energy
3. B. Alpha ray
Explanation:
Which chemical element has the shortest name?
Answer:
deez nuttts
Explanation:
Element 50
Symbol Sn
TIN