Answer:
k = [F2]² [PO]² / [P2] [F2O]²
Explanation:
In a chemical equilibrium, the equilibrium constant expression is written as the ratio between the molar concentration of the products over the molar concentration of the reactants. Each species powered to its reaction coefficient. For the equilibrium:
P2(g) + 2F2O(g) ⇄ 2PO(g) + 2F2(g)
The equilibrium constant, k, is:
k = [F2]² [PO]² / [P2] [F2O]²
Find the hydroxide ion concentration [OH-] of an HCl solution with a pH of 6.93.
Answer:
[OH-] = 1.8 x 10^-7
Explanation:
pH + pOH = 14 --> 6.93 + pOH = 14 *subtract 6.93 from both sides
pOH = 7.07
-->
10^pH => 10^-6.93 => 1e - 6.93 [H+]
-->
H+ x OH- = 1 x 10^-6.93 *divide H+ from both sides
-->
[OH-] = 1.17 x 10^-7 or 1.8 x 10^-7
Four balls have the same temperature. Which ball has the most Thermal Energy? A.Golf ball(45g) B.Basket ball(625g) C.Bowling ball(5000g) D.Tennis ball(60g)
Answer:
b
Explanation:
b. ,u play with the ball, handle the ball grab the ball throw the ball exc.
So3+H2o→H2 So4
use the oxidation numbers to identify the nature of this reaction redox or not
This is not an redox reaction because the oxidation number of Oxygen atom is not changing.
What is the molarity of 15.0 milliliters of an unknown acid that is titrated
with a 1.25 M NaOH solution and required 24.65 milliliters of base to
complete the titration?
Answer:
~2.054M
Explanation:
In this question ,I am going to assume that the acid is monoprotic acid(contains only one hydrogen) which I'll represent by HA.
Chemical equation:
NaOH(aq) + HA(aq)----->NaA(aq) + H2O(l)
The mole ratio of NaOH:HA is 1:1
1.25M NaOH=1.25 Moles/L or 1.25 moles /1000ml of NaOH
(1.25 moles /1000ml) x (24.65ml)=0.0308125 moles NaOH
Mole ratio is 1:1
So, moles of HA are also 0.0308125 moles
volume of HA =15ml
To find molarity of HA:
=(0.0308125 moles x 1000ml)/(15ml)
~2.054M of HA
~Hope it helps:)
Perform the following
mathematical operation, and
report the answer to the
appropriate number of
significant figures.
4.7257 - 3.12 = [?]
Answer:
1.61
Explanation:
I got this answer from a calculator and it's correct.
The drawing below was sketched by a student who was observing cells under a microscope. The cell is classified as
A prokaryotic
B eukaryotic
C periodic
D Nucleotic
Answer:
prokaryotic
Explanation:
I got it right
Fusion reactions power the _____ in space. Humans currently use fusion in _____ , but researchers are seeking more applications.
Answer:
Sun and the stars, nothing humans don't use fusion at all
Explanation:
Nuclear fusion reactions power the sun in space. Humans currently use fusion in nuclear weapons by means of nuclear reactions, but researchers are seeking more applications.
What are nuclear reactions?There are two types of nuclear reactions which are nuclear fusion and nuclear fission .They involve the combination and disintegration of the element's nucleus respectively.
In nuclear fission, the nucleus of the atom is bombarded with electrons of low energy which splits the nucleus in to two parts .Large amount of energy is released in the process.It is used in nuclear power reactors as it produces large amount of energy.
In nuclear fusion,on the other hand, is a reaction which occurs when two or more atoms combine to form a heavy nucleus.Large amount of energy is released in the process which is greater than that of the energy which is released in nuclear fission process.
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Tides are the rise and fall of surface levels of Earth's ocean water caused by the gravitational effects of which two celestial objects?
A)stars and planets
B)comets and meteors
C)earthquakes and volcanoes
D)moon and sun
Answer:
D)Moon and sunExplanation:
Because the gravitational pull of the moon is weaker on the far side of the Earth, inertia wins, the ocean bulges out and high tide occurs.
hope it helps:)
20 mL of hydrogen measured at 15° C is heated to 35°C.
What is the new volume at the same pressure?
V2 = 21.4 ml
Explanation:
Note: When dealing with gases, make sure that you change the units from °C to K.
T1 = 15°C + 273 = 288K
T2 = 35°C + 273 = 308K
V1 = 20 ml
V2 = ?
We use Charles's law to solve V2:
V1/T1 = V2/T2
or
V2 = (T2/T1)V1
= (308K/288K)(20 ml)
= 21.4 ml
Which is true for a substance that releases energy?
OA. The energy release decreases the molecular motion and the kinetic energy of the substance.
B. The energy release decreases the molecular motion but increases the kinetic energy of the substance.
C. The energy release increases the molecular motion and the kinetic energy of the substance.
D. The energy release increases the molecular motion but decreases the kinetic energy of the substance.
E. The energy release is used only to change the state of the substance.
-Carbon and Oxygen combine to from carbon dioxide
Answer:
Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively 12:16 and 12:32.
Whilst Et₃CCl is unreactive towards water even at elevated temperatures, Et₃SiCl is hydrolyzed rapidly. Explain the origin of these differences and provide a reaction scheme with mechanistic details for the hydrolysis of Et₃SiCl.
Answer:
See Explanation
Explanation:
In discussing the reason why Et₃SiCl is more easily hydrolysed than Et₃CCl, we must remember that the electronegativity difference between silicon and chlorine is much higher than the electronegativity difference between carbon and chlorine.
As a result of this, the Si-Cl bond in Et₃SiCl is more polar and hence susceptible to attack by water than the C-Cl bond in Et₃CCl.
Also, it is postulated that the presence of vacant d orbitals on silicon assists hydrolysis in Et₃SiCl. Such vacant orbitals are absent in carbon hence Et₃CCl does not undergo hydrolysis.
The reaction scheme is shown in the image attached to this answer.
16) What is the acceleration of an object with a mass of 31.5 kg when an unbalanced force
of 223 N is applied to it?
Answer:
a= 7.07 m/s^2
Explanation:
Newton's second law of motion states that the acceleration of an object is produced by the net force.
the formula to calculate the force: F=ma
you just rearrange it to solve for a
a= F/m a=223/31.5
=7.07
A group of 6th-grade students constructs arguments on why water conservation is important. Which student argument is correct?
A.
Student 1 argues that people need water for recreation and transportation only.
B.
Student 2 argues that as the population increases in the world, so does the need for water.
C.
Student 4 argues that we use less water for agriculture and more on personal needs.
D.
Student 3 argues that there is an unlimited supply of water for animals, ecosystems, and people to use daily.
From a chemicals standpoint, Student 2 contends that as global population grows, so does the need for water. This is the correct reasoning.
What is the purpose of chemistry?
Our basic needs of food, clothes, shelter, health, energy, and pure air, water, and soil are all met by chemistry. Chemical technologies improve our quality of life in many ways by offering fresh approaches to issues with health, resources, and energy use.
What subjects are studied in chemistry?
The study of matter, including its properties, behaviours, and structures, is known as chemistry. Chemists induce and monitor these reactions both in nature and artificially in a lab setting because they are interested in how materials behave and react in specific settings.
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What two things combine with oxygen to form ground-level ozone?
A) NOx and ODS
B) CFCs and halons
C) NOx and VOC
D) HFCs and HCFCs
Answer:
c) NOx and VOC
oxides of nitrogen (NOx) and volatile organic compounds (VOC)
Explanation:
-
Please help this will determine my grade so I beg help me out and my grade
Answer:
C: checking your email
Explanation:
I believe that C would be impossible, as you cannot use wireless networks without radio waves
What is the difference between light photons and infrared photons?
Answer:
Light Photons: Light behaves mainly like a wave but it can also be considered to consist of tiny packages of energy called photons. Photons carry a fixed amount of energy but have no mass. The energy of a photon depends on its wavelength: longer wavelength photons have less energy and shorter wavelength photons have more.
Infrared photons: Infrared waves, or infrared light, are part of the electromagnetic spectrum. People encounter Infrared waves every day; the human eye cannot see it, but humans can detect it as heat. A remote control uses light waves just beyond the visible spectrum of light—infrared light waves—to change channels on your TV.
On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light, which marks the beginning of the non-visible spectrum, has a wavelength that falls between 700 nm and 1 mm. Because of this, infrared can only be viewed with specialized tools like security cameras.
What is infrared light ?A type of radiant energy that we experience as heat, but that is invisible to human eyes is infrared radiation (IR), often known as infrared light. The sun and fire are two of the most prominent sources of IR radiation, however all objects in the cosmos release some of it.
The energy of the photons determines the various types of radiation, starting with radio waves with low energies. In comparison to visible, ultraviolet, X-ray, and gamma ray photons, which are the most energetic of all, microwave photons have somewhat higher energy. Infrared photons have even more energy.
Cooler objects produce lower energy, longer wavelength photons, while hotter ones release higher energy, shorter wavelength photons.
Thus, On the electromagnetic spectrum, visible light has a wavelength that falls between 380 nm and 750 nm, whereas infrared light.
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MgCl2 + NaOH → Mg(OH)2 +Naci
Balance
PLEASE HURRY. compare the reactivitys of potassium and gold metals toward water, what happens when SO2 reacts with water?? write chemical
Answer:
See Explanation
Explanation:
The reactivity of a metal towards water depends on the position of the metal in the electrochemical series. Metals that are high up in the series do react violently and spontaneously with water. Metals that are lower in the series are sometimes unreactive in water.
Hence, potassium reacts very rapidly with water to yield KOH and hydrogen gas while gold does not react with water.
SO2 react with water to form sulphuric acid hence SO2 is called an acid anhydride.
The reaction occurs in the following steps;
2SO2(g) + O2(g) ------->2SO3(g)
SO3(g) + H20(l) ------>H2SO4(aq)
Petroleum is a mixture of hydrocarbons. It is separated into useful fractions by fractional distillation.
Which property does fractional distillation rely on to separate petroleum?
Explanation:
Fractional distillation is used to separate crude oil into simpler, more useful mixtures . This method can be used because different hydrocarbons have different boiling points
Hope this help u
What is the major difference, in terms of weathering type, between Albany, NY and Washington, D.C.? What might explain this difference?
The breakdown or dissolution of rocks and minerals of the planet's surface is called weathering it can be chemical, biological or physical.
Chemical weathering occurs in regions with high rainfall and high temperature.
In Albany, NY the temperature is 9°C with 98 cm rainfall while in Washington, DC the temperature is 15°C with 111 cm rainfall that is Washington is hotter compared to Albany so it will have chemical weathering.Water (rainfall) and temperature is the main cause of weathering as they loosen and breaks the mineral of rock surfaces.The rocks and minerals get dissolved in the water bodies because of erosion by which they get carried in oceans.Therefore, Albany will have mechanical while Washington will suffer from chemical weathering.
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what is non polar covalent bond
Answer:
It is formed between two atoms of the same elements having same electronegativity in which the bonding electrons are equally shared between them. In this case, the centre of the positive charge coincides with the centre of the negative charge in theecular molecule. H, N: 0. etc. are the molecules in which non polar covalent bonds invalved. These substances are called non polar substances.
Answer:
A nonpolar covalent bond is a covalent bond in which the bonding electrons are shared equally between the two atoms. In a nonpolar covalent bond, the distribution of electrical charge is balanced between the two atoms.
Explanation:
18. How many grams are in 563 mL of chlorine gas at STP?
Answer:
[tex]at \: stp : \\ 22400 \: ml \: are \: occupied \: by \: 71 \: g \: of \: chlorine \\ 563 \: ml \: will \: be \: occupied \: by \: ( \frac{563}{22400} \times 71) \:g \\ = 1.78 \: g[/tex]
A sample of river wayer contains 125mg per dm^3 of dissolved soilds. Calculate the mass of dissolved soilds in grams in 250 cm^3 of this sample of river water. Giver your answer to 2 significant figures (4 marks)
I will give brainilist to anyone who answers
The mass of a substance is the product of its density and volume. Thus, the mass of the dissolved solids with a density of 125 mg/dm³ with a volume of 250 cm³ is 31.25 mg.
What is density?Density of a substance is the measure of its mass per unit volume. Thus it describes how much denser the substance is in a given volume. Mathematically it is the ratio of mass to the volume.
Density of a substance depends on the mass, volume, bond type, temperature and pressure. The ratio of density of a substance with the density of water is called its specific gravity.
It is given that the density of the dissolved solids is 125 mg/dm³ and the volume is 250 cm³ or 0.25 dm³. Thus the mass can be calculated as follows:
density = mass/volume
mass = density × volume
= 0.25 dm³ × 125 mg/dm³
= 31.25 mg
Hence, the mass of the dissolved solids in the river wayer is 31.25 M=mg.
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2AgNO3 (aq) + BaCl2 (aq)
-->
2AgCl (s) + Ba(NO3)2 (aq)
2AgCl (s) + Ba(NO3)2 (aq)
Which statement about hydrocarbons is FALSE?
a
The number one use of hydrocarbons is as a fuel
source.
b
Most hydrocarbons we use today come from
sustainable, renewable sources.
с
Hydrocarbons are useful in industries from
transportation to road work to cosmetics.
d
The bulk of hydrocarbons we use today were
formed hundreds of millions of years ago.
Answer:
b
Explanation:
Hydrocarbons provide 84% of the world's energy, but they are non-renewable. Hydrocarbons are the most economic form of energy.
In a neutral solution, the concentration of H+ is
Group of answer choices
Answer:
equal to [OH-]
Hydrogen ion concentration is more conveniently expressed as pH, which is the logarithm of the reciprocal of the hydrogen ion concentration in gram moles per liter. Thus, in a neutral solution the hydrogen ion (H+) and the hydroxyl ion (OH−)
What volume of 15.9 M Nitric acid would be required to make 7.2 L of 6.00 M nitric acid? (hint: dilution problem) will mark brainliest if correct
a. 2.72 L
b. 686.88 L
c. .075 L
d. 272
Answer:
d
Explanation:
What is the mass in grams of 1.204 x 1024 molecules of
hydrogen gas (Hz)?
a 14.2 g
b 6.77 g
C 4.03 g
3.45 g
What is the pH of 0.0000043M HNO3 ? (3 sig figs, round the last digit only if needed)
Answer:
pH = 5.37
Explanation:
We'll begin by obtaining the concentration of the hydrogen ion in the solution. This can be obtained as follow:
HNO₃ (aq) —> H⁺ (aq) + NO₃¯ (aq)
From the balanced equation above,
1 mole of HNO₃ produced 1 mole of H⁺.
Therefore, 4.3×10¯⁶ M HNO₃ will also produce 4.3×10¯⁶ M H⁺.
Finally, we shall determine the pH of the solution. This can be obtained as follow:
Concentration of Hydrogen ion [H⁺] = 4.3×10¯⁶ M
pH =?
pH = –Log [H⁺]
pH = –Log 4.3×10¯⁶
pH = 5.37
Therefore, the pH of the solution is 5.37