Answers
Light is produced and heat is produced
ExplanationsChemical changes occurs when substances react to form new products. This reaction can be in form of a decomposition reaction.
During fireworks explosion, there is a reaction between charge of gunpowder which is been ignited with a fuse to produce a spark that leads to explosion.
The explosion leads to production of light and heat. Hence we can conclude that some signs that a chemical change takes place when a firework explodes is light is produced and heat is produced
Answer:
Light and heat produced
Explanation:
Related Questions
Need help with this ?The question ask for molecular and empirical formula
Answers
Firslty, we need to find the empirical formula. Assuming the eprcentages are in mass, we first need to to divide each by the atomic weight of the corresponding atom to find the number of moles correspondent of the percentages.
We can use either the percentage or the decimal form, so let's use the decimal:
\(\begin{gathered} P\colon27.87\%=0.2787 \\ S\colon72.13\%=0.7213 \end{gathered}\)The atomic masses are:
\(\begin{gathered} M_P=30.973762g/mol \\ M_S=32.065g/mol \end{gathered}\)So, making the division, we have:
\(\begin{gathered} P\colon\frac{0.2787}{30.973762}=0.008997938\ldots \\ S\colon\frac{0.7213}{32.065}=0.022494932\ldots. \end{gathered}\)Now, we divide one by the other. Since has a bigger number, we can divide it by the P to get the ratio S to P:
\(\begin{gathered} S\colon P \\ \frac{0.022494932\ldots}{0.008997938\ldots}=2.500009599\ldots\approx2.5=\frac{5}{2} \end{gathered}\)This means that for each 5 S we have 2 P, so the empirical formula is:
\(P_2S_5\)Now, the molar mass of this empirical formula is:
\(M_{P_2S_5}=(2\cdot30.973762+5\cdot32.065)g/mol=222.272524g/mol\)To see how many of the empirical formula there are in each of the compound, we divide the molar mass of the compound by the molar mass of its empirical formula:
\(\frac{444.56g/mol}{222.272524g/mol}=2.000067\ldots\approx2\)So, the actual compound has twice the amount of atoms compared to the empirical formula, so its molecular formula is:
\(\begin{gathered} (P_2S_5)_2 \\ P_4S_{10} \end{gathered}\)Aristarchus tried to calculate the sizes of the sun and moon based on
their relative distances from earth. He estimated the size of the sun
relative to the moon by making observations during an eclipse. By
measuring the diameter of the shadow of the earth, he calculated that
the earth is about 2.67 times the diameter of the moon. Aristarchus
then calculated that, since the diameter of the sun was about 19 times
farther away from earth than the moon, its diameter was 19 times
that of the moon, and 7 times that of the earth. Although Aristarchus
was not too far off in calculating the relative size of the earth to the
moon (it is actually 3.6 times bigger), he was way off in calculating
the relative size of the sun. Its diameter is actually 109 times that of
the earth.
1. Which statement is INCORRECT?
A. Aristarchus calculated the distances between the sun and
earth fairly accurately.
B. Aristarchus underestimated the size of the sun in relation
to earth.
C. Aristarchus's estimates of the relative sizes of the earth
and moon were not too far off.
Answers
The incorrect statement is that; "Aristarchus calculated the distances between the sun and earth fairly accurately."
The size of the solar systemThe solar system is composed of the sun, the planets and other celestial bodies such as the moon. We can see form the experiment that Aristarchus tried to determine the relative sizes of the earth and the moon.
However, the incorrect statement is that; "Aristarchus calculated the distances between the sun and earth fairly accurately."
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how do we gain oxygen from trees
Answers
We gain oxygen from trees through the process of photosynthesis. Photosynthesis is the biochemical process in which green plants, including trees, use sunlight, water, and carbon dioxide to produce oxygen and glucose (a form of sugar).
Trees have specialized cells called chloroplasts, which contain a pigment called chlorophyll. Chlorophyll absorbs sunlight energy.
The tree's leaves capture sunlight and use it to convert carbon dioxide (CO2) from the air and water (H2O) from the roots into glucose (C6H12O6) and oxygen (O2).
During photosynthesis, the chlorophyll in the chloroplasts helps to split water molecules into hydrogen ions (H+) and oxygen atoms (O). The oxygen atoms then combine to form O2 molecules.
The oxygen produced during photosynthesis is released into the atmosphere through tiny pores called stomata found on the surface of the tree's leaves. From there, it mixes with the surrounding air and becomes available for us to breathe.
In summary, trees produce oxygen as a byproduct of photosynthesis. They play a crucial role in maintaining the balance of oxygen and carbon dioxide in the atmosphere, providing us with the oxygen we need for respiration.
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How many mL of CH3OH are present in a 17.1 v/v% solution which also contains 320 mL of water?
Do not include units in your answer.
Answers
To calculate this, we need to understand that a 17.1 v/v% solution means that there are 17.1 mL of CH3OH in every 100 mL of solution.
Therefore, we can set up the following equation:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / (x mL CH3OH + 320 mL H2O)
Solving for x, we get:
x = (17.1/100) * (x + 320)
0.171x + 54.72 = x
0.829x = 54.72
x = 66.05 mL
However, we need to subtract the volume of water, so:
x - 320 = 66.05 - 320 = -253.95 mL
Since we can't have a negative volume, we know that there must have been an error in our calculations. This is because we can't have a solution with less than 0 mL of CH3OH.
Going back to the equation, we can see that the problem comes from assuming that the volume of the solution is 100 mL. Instead, we need to assume that there are 100 mL of the solution + 320 mL of water, for a total of 420 mL. The equation then becomes:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / 420 mL
Solving for x, we get:
x = (17.1/100) * 420
x = 71.82 mL
Subtracting the volume of water, we get:
71.82 mL - 320 mL = -248.18 mL
Again, this is negative. The error this time is due to assuming that the volume of the solution is 420 mL, when it's actually the sum of CH3OH and water volumes.
To correct this, we need to recognize that the volume of the solution is the sum of the CH3OH and water volumes. Using the equation above, we can solve for the volume of the solution:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / V mL solution
Solving for V, we get:
V = (x / 0.171) * (100 / 1)
V = 39.77 mL CH3OH
The volume of water is given as 320 mL. Therefore, the volume of the solution is:
V + 320 = 39.77 mL + 320 mL = 359.77 mL
Finally, we can use the volume percentage to calculate the amount of CH3OH in mL:
17.1 mL CH3OH / 100 mL solution = x mL CH3OH / 359.77 mL solution
Solving for x, we get:
x = (17.1/100) * 359.77
x = 61.54 mL
Therefore, there are 61.54 mL of CH3OH in the solution.
what observation could be evidence that a chemical reaction has occurred?
Answers
Answer:
Heat
Explanation:
what are the effects of climate change on the water cycle
Answers
Answer:
Explanation:
The word "water cycle" refers to the series of mechanisms through which water moves between the oceans, atmosphere, and land on earth. This process is being accelerated by the climate crisis because water evaporates more quickly in rising temperatures.
By measuring the salinity of the ocean's surface water, it is possible to determine whether this process is speeding up. This is due to the fact that some ocean water becomes saltier as fresh water evaporation occurs and that heavy rainfall dilutes already fresher water.The increase in rainfall observed in some polar regions, where the speed at which it is raining instead of snowing is accelerating the melting, may also be explained by the increased volume of water moving in the atmosphere.
A decrease in wind in some oceanic regions may also have an impact on the changes in the water cycle.Where there is less wind, the surface water warms up without transferring heat to the water below, causing the surface to become saltier than the lower layers and allowing the effect of evaporation to be measured by satellites.
A faster water cycle increases the likelihood of extreme weather events and contributes to the melting of polar ice.
Climate change is one of the biggest factors and concerns facing the modern world. From carbon emissions, to rising temperatures, and melting ice caps.
The water cycle is the constant movement of all of the water on planet earth. Climate change has been found to have a major and increasing impact on the earth's water cycle. Carbon emissions, agriculture, and industry have led to an overall increase in the average temperature on earth.
This average increase has had some direct impact on the water cycle, especially when it comes to evaporation and precipitation.
Evaporation: As the average temperature around the world increases, evaporation has also increased. An increase in evaporation has also led directly to larger amounts of precipitation. Hotter the day, the faster this process occurs. As the warmer temperature due to global warming due to reduced ozone, this heat beats down on lakes, ponds, etc., causing the water to evaporate at a much faster rate.Precipitation: Since evaporation is closely linked with the water cycle, drought. Increased speed of evaporation due to climate change have led to increased precipitation. Because of wind currents and weather patterns on earth, water that evaporates rarely falls in the same place. Because of this process, the world has seen a major shift in weather patterns in the last few years.Learn more about climate change,
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copper reacts with oxygen to form two oxides x and y. on analysis 1.535g of x yielded 1.365g of copper and 1.450g of y yielded 1.160g of copper (I) determine the chemical formula for x and y (ii) calculate the mass cooper which can react with 0.5g of oxygen to yield x and y (iii) which of the laws of chemical combination is illustrated by the result above?
Answers
The chemical formula for x and y is Cu₂O and CuO. The mass cooper which can react with 0.5g of oxygen to yield x and y is 2.745 g.
What is chemical formula ?A chemical formula is a phrase that lists the constituent parts of a compound together with their relative quantities. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol of an atom if it contains two or more of a certain type of atom.
1. 1.535 g of X → 1.365 g of Copper
1.535 – 1.365 = 0.170g of Oxygen
Atomic weight of Cu = 63.5,
Atomic weight of Oxygen = 16
For Cu 1.365 g / 63.5 = 0.02 mol
For Oxygen 0.170 g / 16 = 0.01 mol
X = Cu₂O
1.450 g of Y → 1.160 g of Cu
1.450 – 1.160 = 0.290 g of Oxygen
For Cu = 1.160 g / 63.5 = 0.018 mol
For Oxygen = 0.290 g / 16 = 0.018 mol
Y = CuO
2. The total mass of Oxygen = 0,170 g + 0,290 g
= 0.460 g
Total mass of Cu = 1.160 g + 1. 365 g
= 2.525 g
0.460 g of Oxygen → 2.525 g of Cu
0.500 g of Oxygen → (2.525 x 0.5) / 0.460
= 2.745 g of Cu
Thus, The law of multiple proportions was formulated by John Dalton in 1804.
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what could have caused the mass to be higher than the initial mass
Answers
Answer:
Possibly the addition of oxygen from the atmosphere
Explanation:
The absorption of energy from atmosphere causes a rise in mass than the initial mass of a substance.
Absorption of energy can increase the mass of a certain substance while release of energy can decrease the mass of a certain substance. For example, when we freeze liquid water, it forms ice. So, its weight increases when it changes its state from liquid to solid. In the same way when liquid water is boiled, upon vaporization it forms water vapor, which is lighter in mass than liquid water. Thus, we can say that temperature also has a role to play in the increase and decrease of mass of a certain substance compared to its initial mass.
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The question should be
What causes the mass to be higher than the initial mass?
if some filtrate splattered out of the beaker while it was heated how would this affect the measured results
Answers
Answer:
it will be all water and it needs to cool of
ch3cl would you expect the following compound to have a dipole moment? if the molecule has a dipole moment, specify its direction. select the single best answer. ch3cl the dipole moment is oriented from the h atoms towards the cl atom. the dipole moment is oriented from the cl atom towards the h atoms. one specific direction of the dipole moment does not exist. the molecule has no dipole moment. ch3cl
Answers
CH3Cl would have a dipole moment, oriented from the H atoms towards the Cl atom.
This is because the Cl atom is more electronegative than the H atoms, so the electrons in the covalent bond between them will be pulled more towards the Cl atom. This creates an uneven distribution of charge and a net dipole moment.
CH3Cl, also known as chloromethane or methyl chloride, is a colorless, flammable gas with a sweet odor. It is a hydrocarbon, meaning it consists of hydrogen and carbon atoms, and is classified as a haloalkane due to the presence of a chlorine atom. CH3Cl is used in a variety of industrial processes, including as a refrigerant and a propellant. It is also used to produce other compounds, such as acetic acid and methylene chloride.
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How much heat is gained by nickel when 31.4 g of nickel is warmed from 27.2 °C to 64.2 °C? The specific heat of nickel is 0.443 J/g · °C.
Answers
Explanation:
To calculate the heat gained by nickel, we can use the formula:
q = m * c * ΔT
where q is the heat gained, m is the mass of the nickel, c is the specific heat of nickel, and ΔT is the change in temperature.
Given:
- Mass of nickel, m = 31.4 g
- Specific heat of nickel, c = 0.443 J/g · °C
- Change in temperature, ΔT = 64.2 °C - 27.2 °C = 37.0 °C
Substituting the values into the formula, we get:
q = (31.4 g) * (0.443 J/g · °C) * (37.0 °C)
Simplifying the calculation, we get:
q = 584 J
Therefore, the heat gained by nickel when 31.4 g of nickel is warmed from 27.2 °C to 64.2 °C is 584 J.
what type of change occurs when rust on a nail a. chemical change b. physical change
Answers
Answer:
Chemical change
Explanation:
The rusting of iron/a nail is a chemical change
Iron (Fe) and Oxygen (O) combine to create the compound Iron Oxide (Fe2O3), which is rust.
Can you Please help me!!!
Answers
Answer:
Option C. Silver is a catalyst in this reaction.
Explanation:
From the question given, we discovered that the addition of silver in the reaction between ethene and oxygen produces epoxyethane at a much faster rate. This simply means that silver act as a catalyst in this reaction.
A catalyst is substance that increases the rate of a reaction without itself taking part in the reaction. The catalyst creates an alternate path way by lowering the activation energy so that the reaction can proceed at a much faster rate.
Since the addition of silver makes reaction to occur at a much faster rate, it therefore means that silver act as a catalyst in the reaction.
. How many moles of oxygen (O) are in 1 mole of calcium carbonate (CaCO3)?
Answers
In 1 mole of calcium carbonate, there are approximately 18.066 x 10^23 moles of oxygen.
To determine the number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3), we need to examine the chemical formula of calcium carbonate and identify the number of oxygen atoms present.
The chemical formula of calcium carbonate is CaCO3. In this formula, we have one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O).
The subscript numbers in the formula indicate the number of atoms for each element. Therefore, we have:
1 calcium atom (Ca)
1 carbon atom (C)
3 oxygen atoms (O)
To calculate the number of moles of oxygen in 1 mole of calcium carbonate, we multiply the number of oxygen atoms (3) by the Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.
Number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3) = 3 moles of oxygen x (6.022 x 10^23 molecules/mol)
Calculating this value, we find:
Number of moles of oxygen (O) in 1 mole of calcium carbonate (CaCO3) ≈ 18.066 x 10^23 moles of oxygen
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hi
Which is NOT something an organism must do to survive?
Question 2 options:
obtain energy to live
communicate verbally
maintain structure
produce offspring
Answers
Answer:
communicate verbally and maintain structure
How does the state of matter affect the behavior of molecules?
Answers
Answer:
The behavior of molecules in different phases of matter represents a balance between the kinetic energies of the molecules and the attractive forces between them. All molecules are attracted to each other. The molecules are in the solid-state. At higher temperatures, the kinetic energy of the molecules is higher.
Molecules are the various elements linked together and are present in the matter. The molecules in different phases of matter are represented by kinetic energies and attractive forces.
What is the kinetic molecular theory of matter?The kinetic molecular theory of matter elucidates the composition of the matter of particles of tiny size. The theory explains matter like gas, liquids, and solids.
The different states of matter explain the constant movement and negligible intermolecular force and volume of the particles. The particle matter is said to undergo elastic collision.
The molecules of solids have low kinetic energy whereas the molecules of liquids and gases show high kinetic energy as the particles are placed at larger distances.
Therefore, the state of matter affects the behavior of molecules.
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PLEASE HELP: Two flasks at the same temperature are joined by a glass tube with a valve. Flask A is a 1.35L flask containing N, (g) at 1.58 atm, while flask B is a 0.55 L flask containing CO(g) at 1.20 atm. What is the final pressure in the flasks after the valve is opened? I got 1.47 but my teacher got 1.00.
Answers
The final pressure can be calculated using Boyle's law at constant temperature. The total volume after the valve is opened is 1.90 L. Thus the final pressure will be 1.47 atm.
What is Boyle's law?Boyles's law states that, at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas. Therefore PV = a constant.
If we have initial volume V1 and pressure P1 for one system and V2 and P2 for a second system. Let these two gases are mixed then they have a total pressure P and the volume be the sum V1 and V2.
Therefore, after mixing:
P1V1 + P2V2 = (V1 + V2)P
(1.35 L ×1.58 atm) + (1.20 atm × 0.55 L) = (0.55 L + 1.35 L) P
P = [ (1.35 L ×1.58 atm) + (1.20 atm × 0.55 L) ] / (0.55 L + 1.35 L)
= 1.47 atm.
Hence, the final pressure of the gas mixture will be 1.47 atm.
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is a pH an atom, ion, molecule, macromolecule, or a cell?
Answers
Although there is some variation amongst tissues, the physiologically typical intracellular pH ranges from 7.0 to 7.4. Skeletal muscle in mammals typically has a pHi of 6.8 to 7.1.
A cell is it an atom?A cell is the basic membrane-bound living thing and can either have one or more cells. All the molecules required for an organism to function are found in cells. An atomic is 10-10m in size. In contrast, a cellular is 10-6 metres in size. Because all cells are composed of atoms, they are therefore bigger than atoms.
What keeps a cell's pH stable?Acid excretion, efflux through plasma membranes, and buffering mechanisms all work together to precisely preserve the pH of body fluids. Protons are extruded from the cytosol into the extracellular space through the organic cation transporter (MCT) and the Na+/H+ exchanger (NHE).
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Please be fast! I will mark brainliest!
H2O + C16H17NaO14 = CO2 + 8H20 + C2H3NaO3 Since there are 19 Hydrogen on the Reactants side, due to Law of Conservation of Mass, there must be ___Hydrogen on the Product side.
A. 0
B. 2
C. 8
D. 19
Answers
Answer: 8
Explanation:
A measurement was taken three times. The correct measurement was 68.1 mL. Circle whether the
set of measurements is accurate, precise, both, or neither.
a) 78.1 mL, 43.9 mL., 2 mL. accurate precise both or neither
b) 68.1 ml, 68.2 mL, 68.0 mL. accurate precise both or neither
c) 98.0 mL, 98.2 mL., 97.9 mL. accurate precise both or neither
d) 72.0 mL, 60.3 mL, 68.1 mL. accurate precise both or neither
Answers
Option B is the correct answer it is accurate, precise both .
How to find accuracy in a measurement ?Accuracy refers to how close average valve is to the actual valve.
a) Average of measured valve is far from the actual valve, so neither precise nor accurate.
b) Average valve = actual valve ,so it is precise as well as accurate.
c) Average of measured valve is far from the actual valve, so neither precise nor accurate .
d) Average valve is close to only measured valve, hence measurement is accurate but not precise.
Hence option B is correct .
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The total pressure of gas collected over water is 770.0 mmHg and the temperature is 23.0 degrees Celsius what is the pressure of hydrogen gas formed in mmHg?
Answers
Given that the total pressure of gas collected over water is 770.0 mmHg, we can assume that this gas mixture contains water vapor and hydrogen gas. We need to determine the partial pressure of hydrogen gas in the mixture.
First, we need to determine the vapor pressure of water at the given temperature of 23.0 degrees Celsius. According to a vapor pressure table, the vapor pressure of water at 23.0 degrees Celsius is 21.1 mmHg.
Next, we can use Dalton's Law of Partial Pressures to calculate the partial pressure of hydrogen gas:
Total pressure = Partial pressure of hydrogen gas + Partial pressure of water vapor
770.0 mmHg = Partial pressure of hydrogen gas + 21.1 mmHg
Partial pressure of hydrogen gas = 770.0 mmHg - 21.1 mmHg = 748.9 mmHg
Therefore, the pressure of hydrogen gas formed in the mixture is 748.9 mmHg.
A 60.0 mL sample of nitrogen is warmed from 350 K to 400 K. Find its new volume if the pressure remains constant.
0.0145 ml
52.50 ml
0.0191 ml
68.57 ml
yes
Answers
Answer:68.57
Explanation:
write a net ionic equation for the reaction that occurs when aqueous solutions of perchloric acid and potassium hydroxide are combined.
Answers
Answer:
H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)
Explanation:
Let's consider the molecular equation that occurs when aqueous solutions of perchloric acid and potassium hydroxide are combined. This is a neutralization reaction.
HClO₄(aq) + KOH(aq) ⇒ KClO₄(aq) + H₂O(l)
The complete ionic equation includes all the ions and molecular species.
H⁺(aq) + ClO₄⁻(aq) + K⁺(aq) + OH⁻(aq) ⇒ K⁺(aq) + ClO₄⁻(aq) + H₂O(l)
The net ionic equation includes only the ions that participate in the reaction and the molecular species.
H⁺(aq) + OH⁻(aq) ⇒ H₂O(l)
cl-+peg=hcl+peg rate law, rate constant k
Answers
a. The rate law for this reaction is: Rate = k[Cl] [H₂]. This means that the rate of the reaction is directly proportional to the concentrations of both Cl and H₂ molecules.
What is rate law?Rate law is an equation that describes the rate of a chemical reaction as a function of the concentrations of reactants. The rate law allows us to describe how the rate of a reaction changes when the concentrations of reactants are changed. It is derived from the rate equation, which is a mathematical expression that can be used to calculate the rate of a reaction from the concentrations of the reactants and the rate constant.
b. The rate law for this reaction is: Rate = k[O] [Os]. This means that the rate of the reaction is directly proportional to the concentrations of both O and Os molecules.
c. The rate law for this reaction is: Rate = k[NO₂]₂. This means that the rate of the reaction is directly proportional to the square of the concentration of NO₂ molecules.
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Complete Question:
what are 2 ways that all hydrocarbons are alike?
Answers
Answer:
Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.
Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.
Explanation:
what happens to the electrons in a covalent bond?
Answers
Answer:
Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.
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pkw definition in chemistry
Answers
Answer:
pkw= pH + pOH.
Explanation:
As. [H3O+] equals [OH-] then pH must equal pOH because they are just negative logs of the respective concentration, which are equal.
Calculate the number of kilograms of sodium fluoride needed per year for a city of 100,000 people if the daily consumption of water per person is 150.0 gallons.
Answers
Fluoridation is the process of adding fluorine to drinking water to avoid tooth decay.
The question is incomplete; the complete question is;
Fluoridation is the process of adding fluorine compounds to drinking water to help fight tooth decay. A concentration of 1 ppm of fluorine is sufficient for the purpose. (1 ppm means one part per million, or 1 g of fluorine per 1 million g of water.) The compound normally chosen for fluoridation is sodium fluoride, which is also added to some toothpastes. Calculate the quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons.
(Sodium fluoride is 45.0 percent fluorine by mass. 1 gallon = 3.79 L; 1 year = 365 days; 1 ton = 2000 lb; I lb = 453.6 g; density of water = 1.0 g/mL.)
The quantity of sodium fluoride in kilograms needed per year for a city of 50,000 people if the daily consumption of water per person is 150 gallons is \(9.32 * 10^9 Kg\).
From the question, we know that;
Daily consumption of water per person = 150 gallons.
Population of the city = 100,000 people
Total daily city consumption =\(100,000 * 150 gallons = 15 * 10^6 gallons\)
Annual water consumption = \(15 * 10^6 gallons * 365 = 5.475 * 10^9 gallons\)
1 gallon = 3.785 L = 3.785 kg
\(5.475 * 10^9 gallons = 5.475 * 10^9 gallons * 3.785 kg/ 1 gallon = 2.1 * 10^10 Kg\)
Since sodium fluoride accounts for 45% by mass of water
Mass of sodium fluoride= \(0.45 * 2.1 * 10^10 Kg= 9.32 * 10^9 Kg\)
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At 600. K how many moles of gas are in a 1.00 L cylinder at atmospheric pressure?
Answers
Answer:
0.02moles
Explanation:
To answer this question, the general gas law equation is used. The General gas law is:
Pv = nRT
Where; P = standard atmospheric pressure (1 atm)
V = volume (L)
n = number of moles
R = Gas law constant
T = Temperature
For this question; volume = 1.00L, atmospheric pressure (P) = 1 atm, R = 0.0821 L-atm / mol K, T = 600K, n = ?
Therefore; Pv = nRT
n = PV/RT
n = 1 × 1/ 0.0821 × 600
n = 1/49.26
n = 0.0203moles
Hence, there are 0.02 moles of gas.
The number of mole of the gas present in the cylinder is 0.02 mole
From the question given above, the following data were:
Temperature (T) = 600 K
Volume (V) = 1 L
Pressure (P) = 1 atm
Number of mole (n) =?The number of mole of the gas present in the cylinder can be obtained by using the ideal gas equation (PV = nRT) as illustrated below:
Temperature (T) = 600 K
Volume (V) = 1 L
Pressure (P) = 1 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =? PV = nRT1 × 1 = n × 0.0821 × 600
1 = n × 49.26
Divide both side by 49.26
\(n = \frac{1}{49.26}\\\\\)
n = 0.02 moleThus, 0.02 mole of the gas is present in the cylinder.
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Draw the Lewis structure for C2H4 (whose skeletal structure is H2CCH2). Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. - CHONSPFBrClIXMore
Answers
Answer:
This is a picture of it hope this helps!
The Lewis structure along with bonds for ethene (C₂H₄) is drawn below-
A Lewis Structure is a very simplified representation of the valence shell electrons in a molecule. It is used to show how the electrons are arranged around individual atoms in a molecule.
The shared pairs of electrons are drawn as lines between atoms, while lone pairs of electrons are drawn as dots next to atoms.
They also display the total number of lone pairs present in each of the atoms that constitute the molecule.
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