Answer:
the number of moles of the gas is 0.00174 mol.
Explanation:
Given;
temperature of the, T = 300 K
volume of the gas, V = 1.45 L
Pressure of the gas, P = 3.0 kPa
The number of moles of the gas is calculated using Ideal gas equation, as follows;
PV = nRT
Where;
n is number of moles of the gas
R is the ideal gas constant, = 8.315 L.kPa/mol.K
n = PV / RT
n = (3 x 1.45) / (8.315 x 300)
n = 0.00174 mol.
Therefore, the number of moles of the gas is 0.00174 mol.
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The endocrine system's role is to send out chemical messages so as to regulate bodily activities. It determines how and when you grow, when you hit puberty and how much your body changes, and even what mood you're feeling right now.
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Please help me and it have a next one I’m going to post it now
5 - What is the pH of a solution with a
pOH of
8.6? What are the [+] and [OH']
concentrations?
Answer:
the pH solution is 4.9.
[[tex]H^{+}[/tex](aq)] = [tex]10^{-pH}[/tex]
Explanation:
1. The largest particles that a stream deposits as it enters a pond are 8 centimeters in diameter. The
minimum velocity of the stream is approximately
1) 100 cm/sec 2) 200 cm/sec 3) 300 cm/sec 4) 400 cm/sec
Help pleaseee.... :(
Answer:
D= .7
C= 1.25
B= 2.2
A= 3.6
The boiling process is considered to be____
your answer is D. physical change, because a new substance is not formed.
The boiling process is considered to be a physical change as no new substance is formed.
What is a physical change?Physical changes are defined as changes which affect only the form of a substance but not it's chemical composition. They are used to separate mixtures in to chemical components but cannot be used to separate compounds to simpler compounds.
Physical changes are always reversible using physical means and involve a change in the physical properties.Examples of physical changes include melting,boiling , change in texture, size,color,volume and density.Magnetism, crystallization, formation of alloys are all reversible and hence physical changes.
They involve only rearrangement of atoms and are often characterized to be changes which are reversible.
Learn more about physical change,here:
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what is the ionic equation for dilute hydrochloric acid and magnesium
Answer:
Mg(s) + 2H⁺(aq) ⟶ Mg²⁺(aq) + H₂(g)
Explanation:
A net ionic equation shows all the ionic substances as ions and shows the correct state of each substance.
Magnesium react with hydrochloric acid according to the equation :
Mg(s)+2HCL(aq)----->MgCL2(aq) +H2(g)
This demonstration can be used to illustrate the characteristics reactions of metals with acid , a single replacement reaction ,or to demonstrate the generation of hydrogen gas.
potassium solid and aqueous zinc chloride react to produce what?
K (s) + ZnCl (aq) ====》 KCl ( aq) + Zn (s)
Which pieces of equipment are
needed to calculate the velocity of a
falling object?
A stopwatch and balance
B speedometer and magnet
C compass and tape measure
D tape measure and stopwatch
PLEASE HELP
How does increasing the amount of greenhouse gases affect the earth?
It causes more hurricanes and tornadoes.
It lowers the earth's global temperature.
It causes fewer thunderstorms.
It raises the earth's global temperature.
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I needed the answer for the test and he is correct
10g of marble was added to 15 grams of dilute hydrochloric acid, product formed is calcium chloride, water and carbon dioxide. which of the following is true?
Answer:
Hydrochloric acid is the excess reactant
Explanation:
I got it right lol
The correct answer is Option B.
Hydrochloric acid is the excess reactant.
Explain about exothermic reaction?An exothermic reaction is one in which energy is given off as heat or light. In contrast to an endothermic reaction, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.Calcite in marble and limestone dissolves when sulfurous, sulfuric, and nitric acids in polluted air and rain react with it. We observe roughened surfaces, the removal of material, and the loss of carved details in exposed areas of buildings and statues.Because of its basic nature, the calcium carbonate in marble neutralizes the hydrochloric acid in the reaction described above. A base is defined as "a compound that reacts with an aqueous solution of an acid to produce a water and salt solution in which the salt gets separated into its component ions." Any extra salt that remains after a given salt solute has saturated the aqueous solution precipitates out of the solution.To learn more about exothermic reaction refer to :
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If you observe a Full Moon on January 12th, on what date would you observe the next New Moon?
January 19
Explanation:
every first 7 days of a month the moon roughly starts its full moon phase
What is the percent composition of water found in tin (IV) oxide octahydrate?
Answer:
tin (IV) oxide octahydrate contains 8 part water
What is the percent composition of water found in tin (IV) oxide octahydrate?
The liquid metal at room temperature (a) Mercury (b) Sodium (c) Magnesium (d) Silver
Answer:
(a) Mercury
Explanation:
Mercury with chemical symbol (Hg) is also regarded as " quicksilver". It is heavy and silvery in nature and belongs to d-block of the periodic table, it is metallic element and it is liquid at standard conditions of (temperature and pressure). It has Boiling point of about 356.7 °C with Atomic number of 80. It can molten above the temperature of ( −38.8 °C)
The air we breathe is a(n) _____.
How many moles are in 46.7g of H2O gas?
Complete the sentence:
The north pole of a magnet____ the north pole of another magnet.
-will attract
-may repel, attract, or not affect
-will not affect
-will repel
the north pole of the magnet will repel the north pole of another magnet
Which one is the right answers?
What causes the release of energy in an exothermic reaction? Bonds breaking Bonds breaking A catalyst A catalyst Bonds being formed Bonds being formed Electrons escaping the bond
Answer:
weak bonds break and strong bonds form
Explanation:
An exothermic reaction is a chemical reaction in which heat energy is evolved during the reaction process.
Bond formation requires energy while bond breakage releases energy. More energy is needed for the formation of weak bonds as compared to strong bonds.
Hence, when weak bonds break, they release more energy than needed to make a corresponding strong bond leading to the release of the remaining energy as heat.
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How do i describe endothermic and exothermic changes in matter?
Please help!! The answer that shows work and does not send link will get brainiest!
Answer:
5 mol H₂. this is the answer bro all the best for your test/exam
Which of the following is true concerning methane?
1)It is a gas at standard temperature and pressure.
2)It consists of one carbon atom and four hydrogen atoms.
3)It is the major component of natural gas.
4)all of the above
Answer:
4
Explanation:
at room temperature and standard pressure methane is a colourless gas. Methane consist of one carbon atom bonded to 4 hydrogen atom and it also forms the major percentage of natural gas
Regarding methane, it is true that:
It is a gas at standard temperature and pressure. It consists of one carbon atom and four hydrogen atoms. It is the major component of natural gas. All of the aboveLet's consider which of the following is true concerning methane?
1) It is a gas at standard temperature and pressure. TRUE. Like most small hydrocarbons, methane is a gas at STP.
2) It consists of one carbon atom and four hydrogen atoms. TRUE. The chemical formula of methane is CH₄.
3) It is the major component of natural gas. TRUE. It represents about 95 mole % of natural gas.
4) All of the above. TRUE.
Regarding methane, it is true that:
It is a gas at standard temperature and pressure. It consists of one carbon atom and four hydrogen atoms. It is the major component of natural gas. All of the aboveLearn more: https://brainly.com/question/2127750
TRUE or FALSE: Traits that an organism has can be influenced by factors in the environment.
Answer:
True
Explanation:
Hope this helps
A sample of oxygen gas occupies a volume of 250 mL at .8 atm of pressure. What volume will it occupy at 1.2 atm of pressure?
A study was conducted to see if increasing the substrate concentration has an appreciable effect on the velocity of a chemical reaction. With a substrate concentration of 1.5 moles per liter, the reaction was run 15 times, with an average velocity of 7.5 micromoles per 30 minutes and a standard deviation of 1.5. With a substrate concentration of 2.0 moles per liter, 12 runs were made, yielding an average velocity of 8.8 micromoles per 30 minutes and a sample standard deviation of 1.2. Is there any reason to believe that this increase in substrate concentration causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
Answer:
There is not enough evidence
Explanation:
For 1.5 moles substrate concentration per liter
Reaction ( n2 ) = 15 runs
average velocity ( x2 ) = 7.5 micromoles per 30 minutes
standard deviation ( s2 ) = 1.5
For 2.0 moles substrate concentration per liter
Reaction( n1 ) = 12 runs
average velocity ( x1 ) = 8.8 micromoles per 30 minutes
standard deviation ( s1 ) = 1.2
Show Reason to believe that this increase in substrate conc causes an increase in mean velocity
Hypothesis test
H0 : μ1 - μ2 = 0.5
H1 : μ1 - μ2 > 0.5
level of significance ( ∝ ) = 0.01
attached below is a detailed solution to the problem
P-value ( 0.073 ) > level of significance ( 0.01 ) hence we fail to reject the null hypothesis
hence there in not enough evidence to believe that this increase causes an increase in the mean velocity of the reaction of more than 0.5 micromole per 30 minutes
Where are the places these minerals are found: Gold, Limestone and kaiolin.
Explanation:
Gold: The Kolar Gold Fields in Kolar used to be one of the major producers of gold in India, before it shut down. Presently the gold mines of Hutti and Raichur produce almost 84 per cent of the country’s gold. The other major centers of gold mining are Dharwad and Chitradurga. The gold mines produce about 3,000 kg’s of gold per annum. The district of Raichur is also famous for its silver deposits.
Limestone: It is another important mineral with an estimated 51,000 million tons. Karnataka has the largest limestone reserve in India. The districts of Gulbarga, Bagalkot, Belgaum, Shimoga and other Uttara Kannada districts are endowed with extensive high grade limestone. The present and consistent production of approximately 14 million tonnes provides for the cement plants in these districts.
China clay (kaolin) consisting dominantly of kaolinite is one of the most sophisticated industrial minerals with a host of applications, viz., in ceramics, refractories, paper coating, filler for rubber, insecticides, cement, paint, textiles, fertilizers and others including abrasives, asbestos products, fibreglass, chemicals, cosmetics, pharmaceuticals, electrical ware, foundry and glass.
The Department of Mining and Geology through their past investigation campaigns in parts of Kerala,identified two major china clay zones viz., the southern china clay zone between Thiruvananthapuram and Kundara (Thiruvananthapuram and Kollam districts) and the northern china clay zone between Kannapuram Madayi -Cheruthazham in Kannur district to Nileswarm - Manjeshwaram in Kasargod district. An estimated reserve of 172 million tonnes (probable reserve of 80 million tonnes and possible reserve of 92 million tonnes) of china clay of sedimentary and residual origin has been arrived at.
Kerala china clay is one of the finest quality clay and is world class. In fact, Kaolin marketed by English Indian Clays Ltd. (EICL), Thiruvananthapuram claims to have similar or even better properties compared to imported clays.
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qestions do you have about plate tectonics
From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past.
Developed from the 1950s to the 1970s, the theory of plate tectonics is the modern update to continental drift, an idea first proposed by scientist Alfred Wegener in 1912 which stated that Earth’s continents had “drifted” across the planet over time. Wegener didn't have an explanation for how continents could move around the planet, but researchers do now: plate tectonics.
Plate tectonics is the theory that Earth's outer shell is divided into large slabs of solid rock, called “plates,” that glide over Earth's mantle, the rocky inner layer above Earth’s core. Earth’s solid outer layer, which includes the crust and the uppermost mantle, is called the lithosphere. It is 100 km (60 miles) thick, according to the Encyclopaedia Britannica. Below the lithosphere is the asthenosphere—a viscous layer kept malleable by heat deep within the Earth. It lubricates the undersides of Earth's tectonic plates, allowing the lithosphere to move around.
Answer:
1. How fast do tectonic plates move? Answer: There are seven major plates: African, Antarctic, Eurasian, Indo-Australian, North American, Pacific and South American
2. What are the factors affecting plate tectonics? Answer: The force that causes most of the plate movement is thermal convection, where heat from the Earth's interior causes currents of hot rising magma and cooler sinking magma to flow, moving the plates of the crust along with them.
3. What 3 things support the theory of plate tectonics? Answer: Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.
Explanation:
What happens when you mix calcium chloride and hydrogen peroxide?
Answer:
Explanation: When chlorine reacts with hydrogen peroxide, hydrogen peroxide falls apart into water and oxygen. Chlorine gas hydrolyses into hypochlorous acid (, which subsequently into hypochlorite ions . The reaction between hydrogen peroxide and hypochlorite takes place very quickly.
Can someone answer this, NO ROBOTS!!!!
Genetic engineering improved the lives if individuals with insulin because it helps the body use and store sugar, since people with diabetes can't produce insulin.