Answer: The standard enthalpy of formation of [tex]H_2O(g)[/tex] is -252.1 kJ/mol.
Explanation:
The balanced chemical reaction is,
[tex]Fe_2O_3(s)+3H_2(g)\rightarrow 2Fe(s)+3H_2O(g)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=[n\times H_f_{products}]-[n\times H_f_{reactantss}][/tex]
Putting the values we get :
[tex]\Delta H=[2\times H_f{Fe}+3\times H_f{H_2O}]-[1\times H_f{Fe_2O_3}+3\times H_f{H_2}][/tex]
[tex]67.9kJ=[(2\times 0)+(3\times H_f{H_2O})]-[(1\times -824.2kJ/mol)+3\times 0kJ/mol)][/tex]
[tex]H_f{H_2O}=-252.1kJ/mol[/tex]
Thus standard enthalpy of formation of [tex]H_2O(g)[/tex] is -252.1 kJ/mol.
what is the formal charge in SeCl4?
Which of the following is not among the elements to include on your note cards?
I. a number to identify the card and link it to a bibliography card
II. the subject (if you know what it is)
III. publishing information about the work in question
IV. your notes
A. II
B. I
C. IV
D. III
Answer:
c
Explanation:
Answer:
The answer is C
Explanation:
Which statement describes the appearance of a
temperature-vs.-time graph?
A horizontal line shows that the temperature
increases at a constant rate over time.
O. A vertical line shows that the temperature
decreases at a constant rate over time.
Horizontal lines where the temperature is
constant during phase changes connect
upward-sloping lines where the temperature
increases.
Horizontal lines where the temperature
increases are connected by upward-sloping
lines where the temperature is constant for
each phase.
Answer: C. Horizontal lines where the temperature is constant during phase changes connect upward-sloping lines where the temperature increase.
Explanation:
Answer:
C
Explanation:
Famous people who talked about plastic water bottles
How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
Molar Mass Mg: 24.30 g/mol
Molar Mass S: 32.06 g/mol
Molar Mass O: 16.00 g/mol
Answer:6.68
Explanation:
Q) Briefly describe how body systems work all together
Answer:
Your bones and muscles work together to support and move your body. Your respiratory system takes in oxygen from the air. ... Your circulatory system carries oxygen, water, and nutrients to cells throughout your body. Wastes from the cells are eliminated by your respiratory system, your excretory system, and your skin.
Explanation:
The map shows the movement pattern for major ocean currents. What ideas do you have about what might make ocean
currents move?
Please help
Answer:
Currents are physical occurrences or factors that put motion into oceans, making them move back and forth.
Such factors include but may exceed the following:
WindVariation in water mass densities (this is caused by alterations in temperature and salinity levels)GravityEarthquakes or stormsWhen there is movement in ocean currents, heat, nutrients, water oxygen levels are also affected.
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Consider the balanced chemical equation
4B(s) + 302 (g)► 2B203(s)
What mole ratio would you use to calculate how many moles of oxygen gas would be needed to react completely with a given number of moles of boron?
A. 3 mol O2
/ 4 mol B
B. 4 mol O2/
3 mol B
C. 3 mol O2/
2 mol B
D.
2 mol O2
/ 3 mol B
Answer:
A
Explanation:
The coefficents are used when determining mole ratio. So just look in front of O and B
the ratio is 3/4
you cna use this in stoich as well
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Answer:
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A scientist has two substances that she is testing in her lab: a pink
substance and a green substance. At room temperature, both substances
are liquids. The scientist transferred the same amount of energy into both
substances. She finds only the pink substance changed phase. How is the
pink substance different from the green substance? The pink substance
has a ...*
weaker attraction between its molecules than the green substance. Its molecules now
move away from each other.
weaker attraction between its molecules than the green substance. Its molecules now
move in place.
stronger attraction between its Molecules than the green substance. Its molecules
now move away from each other.
stronger attraction between its molecules than the green substance. Its molecules
move around each other.
Answer:
Weaker attraction between its molecules than the green substance. It's molecules now move away from each other.
Explanation:
Liquid to gas.
The pink substance should be weaker attraction between its molecules than the green substance. It's molecules now move away from each other.
The following information should be considered:
The pink substance considered to the weaker attraction that lies between the molecules as compared to the green substance. It is move away from each other, Also it is liquid to gas.Learn more: brainly.com/question/17429689
What would a curve with the shape of an isoceles triangle indicate?
The Moon shines white light on Earth. Is the Moon a good blackbody
radiator? Why?
O A. Yes, because the light from the Moon comes from the Sun, which
is a blackbody radiator
B. No, because white light is only one wavelength of light, not a range
of wavelengths
O C. No, because the Moon reflects most of the Sun's light rather than
absorbing it
O D. Yes, because each night the Moon warms up enough to emit
visible light at a range of wavelengths
Answer:
C.) No, because the Moon reflects most of the Sun's light rather than
absorbing it
Explanation:
:p
PLEASE HELP ME YOU DONT HAVE TO DO WORK JUST TELL ME IF ITS RIGHT ON THE ORGANIC AND INORGANIC SIDE PLEASEE
Answer:
Its right you dont have to change anything
Can you list some examples for each of the three domains of bacteria, archaea, and eukarya?
Answer: bacteria: e Coli
Explanation:
The bacteria and archaea are microorganisms. Escheria coli, staphylococcus aureus etc are examples of bacteria. Different types of archaea includes bathyarchaeota, thermoproteota etc. Eukaryotes are multicellular organisms such as plants, fungi, animals etc.
What are eukaryotes?Eukaryotes are multicellular organisms with developed cellular organization and developed nucleus. All the higher level organisms such as humans, animals, fungi, plants etc are eukaryotes.
Microorganisms such bacteria are single celled organisms and they are called unicellular having only one cell without a developed nucleus.There are many types of bacteria based on their structure and functions such as spirulina, staphylococcus, vibrio coli etc.
Archaea is another type of unicellular organism which first classified as type of bacteria, but later they are included in a new class of domain. They are natural methanogens that is they produce methane gas. Some examples are bathyarchaeota, thermoproteota etc.
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Which of the following describes the role of water in supporting the chemical reactions that occur within various life forms?
It is a non-polar molecule with weak hydrogen boding.
It is critical in the process of cellular respiration.
It has a huge electronegativity difference between its atoms.
It allows sunlight to pass through it.
Answer:
It's critical in the process of cellular respiration
It is critical in the process of cellular respiration; is the correct answer; as water plays a very important role in transportation of oxygen and maintaining cell structure.
What is cellular Respiration ?The process by which organisms combine food molecules with oxygen to form energy , which is used for life sustaining activities is called Cellular Respiration.
Carbon Di-Oxide and Water are produced as by products.
Water acts as a solvent in facilitating the transport of oxygen in respiration.
At the molecular level, water permits everything inside the cell to have the proper structure which is very important for biological processes.
Hence option B , i.e. It is critical in the process of cellular respiration; is the correct answer.
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How many more atoms does carbonic acid have than water ?
Answer:
I believe the answer is 3. Carbonic acid has 3 more atoms than water.
Explanation:
Because water has 3 atoms and I think Carbonic acid has 6 so 6-3=3.
How many moles of iron will be produced from 6.20 moles of carbon monoxide reacting with excess iron oxide
Explanation:
..........................m
Lenses are made to have different focal points. What two properties of a lens
affect the focal length?
A. Where the object is located
O B. Whether the image is virtual or real
O C. The material the lens is made from
O D. The centers of curvature of the two sides of the lens
Identify each of the following half-reactions as either an oxidation half-reaction or a reduction half-reaction. half-reaction identification Sn2 (aq) 2e-Sn(s) reduction Al(s)Al3 (aq) 3e- oxidation (2) Write a balanced equation for the overall redox reaction. Use smallest possible integer coefficients.
Answer: Oxidation reaction: [tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]
Reduction reaction: [tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]
Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]
Explanation:
Oxidation-reduction reaction or redox reaction is defined as the reaction in which oxidation and reduction reactions occur simultaneously.
Oxidation reaction is defined as the reaction in which a substance looses its electrons. The oxidation state of the substance increases.
[tex]Al(s)\rightarrow Al^{3+}(aq)+3e^-[/tex]
Reduction reaction is defined as the reaction in which a substance gains electrons. The oxidation state of the substance gets reduced.
[tex]Sn^{2+}(aq)+2e^-\rightarrow Sn(s)[/tex]
Overall redox reaction : [tex]2Al(s)+3Sn^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Sn(s)[/tex]
What is the kinetic energy of a bicycle with a mass of 11 kg traveling 8 m/s?
What is the kinetic energy of a bicycle with a mass of 11 kg traveling 8 m/s ?
Answer:-Mass (m) of a bicycle is = 11 kg
Speed (v) of a bicycle is = 8 m/s
Kinetic energy (K.E) of a bicycle is = ?
Since, we know,
[tex] { \boxed{\rm \red {K.E \: = \frac{1}{2} mv²}}} [/tex][tex] \bf K.E \: = \frac{1}{2} \: × \: 11 \: kg \: × \: (8 \: m/s)² [/tex]
[tex] \bf K.E \: = \frac{1}{2} \: × \: 11 \: kg \: × \: 64 \: m²/s²[/tex]
[tex] \bf K.E \: = \frac{704}{2} \: kg \: m²/s² [/tex]
[tex] \bf K.E \: = \: 352 \: kg \: m²/s² [/tex]
The kinetic energy (K.E) of a bicycle is 352 kg m²/s². [Answer]Which of the following apply to gases. Select all that apply.
Answer:
kindly give options
Explanation:
1. Caffeine has a distribution coefficient of 8.4 for methylene chloride (CH2Cl2)/water (H2O). How much caffeine will be extracted from a 60 mL cup of Turkish coffee (100 mg caffeine) by 40 mL of methylene chloride (CH2Cl2)
Answer:
91.224 mg of caffeine will be extracted from a 60 mL cup of Turkish coffee (100 mg caffeine) by 40 mL of methylene chloride (CH2Cl2)
Explanation:
The distribution co-efficient of Caffeine for methylene chloride (CH2Cl2)/water (H2O) is 8.4
Volume of Turkish coffee = 60 mL
Volume of methylene chloride (CH2Cl2) = 40 ml
Distribution coefficient is represented by K
[tex]8.4 = \frac{\frac{X}{60}}{\frac{100-X}{50} } \\X = 91.224[/tex] mg
Which example is a mixture? alcohol water mercury orange soda
Answer:
water is an example of mixture
charles law . who can please help me with these two problems asap ?
Answer:
k
Explanation:
An alpha particle is an ionized helium nucleus, consisting of 2 protons and 2 neutrons bound together. When alpha particles are beamed toward a thin metal foil, most of them pass through, undergoing a small deflection, while a small fraction of them bounce back at much larger angles in excess of 90 degrees relative to their incoming direction. The reason this happens is that Group of answer choices
Answer:
Due presence of empty as well as heavy particles.
Explanation:
The main reason for this is the presence of empty spaces as well as heavy particles in the nucleus of Helium atom. Most of the beam pass through the helium atom due to the presence of empty spaces in the atom whereas some beams deflect from the helium atom because both repel each other due to same charge i.e. positive charge. Few beams of light bounce back with an angle of 90 degree due hitting with the nucleus where heavy particles such as neutron and proton are present.
What solid figure has two bases, but no lateral faces?
cylinder
rectangular prism
triangular prism
cone
Answer:
it is cylinder as it has two bases but no lateral faces.
What is the Electron Center Geometry of a CH3 carbon.
Answer:
tetrahedral geometry
CHCH2O- CH2CH3Explanation:
There are several centers of interest. Each carbon with all single bonds is the center of a tetrahedral geometry.
Consider this statement: Earth is the only source of gravity in the solar system. Do you agree? Give
your reasons.
Answer:
Explanation:
You're kidding, right?
Earth is a puny little planet stuck in the Milky Way which is not a particularly large galaxy that has millions of stars with many times more our gravitational influence.
We are very lucky that the gravitational force is so weak. Were it not, We would be pulled in every direction imaginable and swallowed many times by larger and larger black holes until our existence could never be traced.
We would be like 1 electron in all the atoms of the Universe combined. There's no end to the size and scope of the forces involved if the gravitational force were even a small bit larger than what it is now.
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A volume of 1.0 L of air at 37°C is expelled from the lungs into cold surroundings at 5.6°C.
What volume in L) does the expelled air occupy at this temperature. The pressure and the number of
gas particles do not change.
L
Answer:
If kept in Celsius: 0.15 L
If kept in Kelvin: 0.89 L = 0.90 L
Explanation:
This formula can be remembered by just remembering the ideal gas law formula, PV=nRT
P= pressure, V= volume, n= moles, R=constant, and T= temperature.
Let's take away what is constant, particles/moles, pressure, and R.
so what we have is P=T -> [tex]\frac{V}{T}[/tex] =x, we want to know how it changes though so we can say that [tex]\frac{V1}{T1} = \frac{V2}{T2}[/tex]. Where P1 and T1 are for the air in your lungs that you expel, the P2 and T2 is the air now in your surroundings after you exhale.
Let's plug it in and solve for V2.
[tex]\frac{1 L}{37 C} = \frac{V2}{5.6}[/tex]
[tex]\frac{(1 L x 5.6 C)}{37 C} =[/tex] V2
0.15 L = V2
Which has greater heat capacity—iron, tin, or bismuth? Why do you say this?
Answer:
Bismuth, because when three cubes of the same mass were heated and dropped into the same temperature water, the water the bismuth cube was dropped in heated up much less than the water with iron or tin.
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The greatest heat capacity is possessed by iron.
The heat capacity of materials increases as the number of particles in the material or density of the material increases.
This means that the denser a material is, the higher its heat capacity because it has more particles that absorbs heat.
The heat capacity is the quantity of heat required to raise the temperature of 1 gram of a material by 1°C.
The heat capacities of iron, tin and bismuth are: 0.45 J/g °C, 0.213 J/g °C and 0.123 J/g °C.
This follows from the decreasing densities of the metals in the order; iron > tin > bismuth.
Hence iron has the greatest heat capacity among the three elements.
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