Answer:
Memory foam: NASA developed memory foam to help cushion and support astronauts during space flight. Today, it is used in mattresses, pillows, and other products to provide comfort and support.
Cordless power tools: NASA developed cordless power tools to help astronauts conduct repairs and experiments in space. Today, these tools are widely used in construction, manufacturing, and other industries.
Water filtration systems: NASA developed advanced water filtration systems to help astronauts recycle water in space. These systems are now used in homes and businesses to purify water for drinking and other purposes.
Scratch-resistant lenses: NASA developed a scratch-resistant coating for astronaut helmet visors that is now used on eyeglasses and other lenses.
GPS technology: NASA's Global Positioning System (GPS) technology is used for navigation in cars, airplanes, and boats, as well as for location-based services on smartphones and other devices.
Artificial limbs: NASA developed robotic arms for use in space, which inspired the development of advanced prosthetic limbs for amputees.
Infrared ear thermometers: NASA developed an infrared sensor to measure the temperature of stars and planets, which led to the development of infrared ear thermometers.
Explanation:
Which method would you use to separate sand and salt and water?
Answer:
Filtration
Explanation:
Sand can be separated by filtration. Then, salt can be separated by evaporating the salt solution in water. Water can be recovered by condensation.
pls mrk me brainliest
Answer:
decantation and evaporation
Explanation:
molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(iii) oxide and coke (pure carbon). if 25.0 grams of pure fe2o3 are used, how many atoms of iron can be produced?
Molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide (Fe2O3) and coke (pure carbon).
If 25.0 g of Fe2O3 are used, the number of atoms of iron that can be produced is determined using the balanced equation:
Fe2O3 + 3C → 2Fe + 3CO
Using the mole ratio from the equation, we know that for every 1 mole of Fe2O3 that is used, 2 moles of iron are produced.
We can then convert the 25.0 g of Fe2O3 to moles by using the molar mass of Fe2O3 (159.69 g/mol):
25.0 g Fe2O3 × (1 mol Fe2O3/ 159.69 g Fe2O3) = 0.1566 mol Fe2O3
And using the mole ratio, we can calculate the moles of iron produced:
0.1566 mol Fe2O3 × (2 mol Fe/ 1 mol Fe2O3) = 0.3132 mol Fe
Finally, we can convert the moles of iron produced to atoms of iron by using Avogadro's number (6.022 x 1023 atoms/mol):
0.3132 mol Fe × (6.022 x 1023 atoms Fe/ 1 mol Fe) = 1.878 x 1023 atoms Fe
Therefore, if 25.0 g of pure Fe2O3 are used, 1.878 x 1023 atoms of iron can be produced.
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How the abiotic factors impacted the biotic factors in Chernobyl??
URGENT!!
Answer:
The Chernobyl disaster of 1986 was a nuclear accident that had a significant impact on the environment and the living organisms in the surrounding area. The abiotic factors, including radiation and temperature changes, had a profound impact on the biotic factors, including plants and animals.
Radiation: One of the primary abiotic factors that impacted the biotic factors in Chernobyl was radiation. The explosion at the nuclear reactor released large amounts of radioactive material into the environment, which had a devastating impact on the plants and animals in the area. Many of the trees and plants in the surrounding forests died, and the animals that ate these plants were also affected. The radiation also caused genetic mutations in many of the organisms in the area.
Soil: The soil in the area was also impacted by the radiation, which caused changes in the nutrient levels and pH levels. This made it more difficult for plants to grow and survive in the area, and it also impacted the animals that depended on these plants for food.
Temperature: The temperature in the area was also impacted by the radiation, which caused changes in the weather patterns. The increased levels of radiation also caused higher temperatures in the area, which made it more difficult for plants and animals to survive.
Overall, the abiotic factors, including radiation, soil, and temperature changes, had a significant impact on the biotic factors in Chernobyl. Many of the plants and animals in the area were negatively impacted, and the ecosystem in the surrounding area was altered in ways that are still being studied today.
20. Based on the concept of periodic trends, answer the following questions for these atoms: Au, Zn,
S, Si. Be able to defend your answers.
a. Which element has the highest electronegativity?
b. Which element has the most metallic character?
C. Which element has the largest atom?
The element with lowest electronegativity, based on periodic trends, is Li. An atom's electronegativity is measured.
How would you describe recurring patterns?Atomic radius, ionisation energy, electron attraction, electronegativity, valency, and metallic nature are important periodic trends. Due to the periodic nature of the elements and their similar electrical configurations within their various groups or periods, these tendencies are present.
What contributes to recurring trends?The number of protons on the nucleus, the number of energetic levels, & the shielding effect are three variables that aid in the prediction of trends in the periodic table. In any group, the atomic radii get larger from top to bottom.
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A student set up a titration apparatus that involved using 25. 9 mL of 1. 57 M acetic acid. The acetic acid was titrated with 0. 154 M NaOH.
What is the pH of the titration solution after 2. 19 mL of the NaOH was added if the Ka of acetic acid is 1. 8 x 10-5?
Answer:
The PH is 2.66 of the titration solution after 2.19 ml of the naoh was added if the ka of acetic acid is 1.8 x 10-5
Explanation:
To begin today’s experiment you wash a 125 ml erlenmeyer flask and set up the experiment as show in figure 1. After allowing your water to boil for 10 minutes you remove the flask, clamp it and immerse it in water. After performing your calculations you see that your data is a little higher than everyone else’s. What is the probable source of the error?
One potential source of error could be a measurement error, either in the volume of water added or in the temperature of the water. Another potential source of error could be a problem with the calibration of the thermometer used to measure the temperature of the water.
However, one of the most likely sources of error in this case is the presence of air bubbles in the erlenmeyer flask during the experiment. Air bubbles can act as an insulator, trapping heat and preventing the water from reaching the same temperature as the rest of the water in the flask. This can result in an inaccurate measurement of the water's temperature and ultimately affect the calculation of the experimental data.
To reduce the impact of air bubbles in future experiments, it is recommended to ensure that the erlenmeyer flask is thoroughly cleaned and free of any debris or contaminants that may trap air bubbles. Additionally, carefully swirling the flask during the heating process can help to dislodge any trapped air bubbles and ensure that the water is evenly heated.
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PLEASE HELPPPP I WILL GIVE BRAINLIST
The possible values of the quantum numbers are:
Orbital shape quantum number l: 0, 1, 2, 3, 4, or 5.
Magnetic quantum number m: -l to +l.
Spin quantum number, s: +1/2 or -1/2.
What are the azimuthal, magnetic, and spin quantum numbers of the valence electrons in an atom with principal quantum number, n = 6?For the principal quantum number n = 6, the possible values of the azimuthal (orbital shape) quantum number l are 0, 1, 2, 3, 4, and 5.
The magnetic quantum number m can have values ranging from -l to +l, inclusive.
The spin quantum number, s can be either +1/2 or -1/2.
So, the valence electrons in an atom with principal quantum number n = 6 can have the following quantum numbers:
Azimuthal quantum number, l can be 0, 1, 2, 3, 4, or 5.
Magnetic quantum number, m can range from -l to +l, inclusive.
Spin quantum number, s can be either +1/2 or -1/2.
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Can someone please help with this chemistry question
The molar mass of barium phosphate to calculate the mass of barium phosphate produced is 48.26 g of Ba₃(PO₄)₂.
What is molar mass?Molar mass is a term used in chemistry to refer to the mass of a single molecule of a substance. It is calculated by multiplying the atomic mass of each element in the molecule by the number of atoms in the molecule and then adding up the results.
Balancing the equation:
Ba + 3Cu + 4PO₄ -> Ba₃(PO₄)₂ + 3Cu
Since 5.84 g of barium is given, we can use the mole ratio between barium and barium phosphate to calculate the number of moles of barium phosphate produced.
Molar mass of barium = 137.33 g/mol
Molar mass of barium phosphate = 377.3 g/mol
5.84 g of barium = 5.84 g / 137.33 g/mol = 0.0427 mol of barium
Using the mole ratio of 1 mol Ba : 3 mol Ba₃(PO₄)₂, we can calculate the amount of barium phosphate produced:
0.0427 mol of Ba * (3 mol Ba₃(PO₄)₂ / 1 mol Ba) = 0.1281 mol of Ba₃(PO₄)₂
Finally, we can use the molar mass of barium phosphate to calculate the mass of barium phosphate produced:
0.1281 mol of Ba₃(PO₄)₂ * 377.3 g/mol = 48.26 g of Ba₃(PO₄)₂.
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E
C
A
Making Esters
1. Name the following esters and give the name of the alcohol + carboxylic reacted to make each one.
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Hнн
H-C-ë-o-С-С-Н
II
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н н
H-c-c-c
11
нн
H-C - c- c-c
| | |
Hнн
=0
нн
I Т
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Н
O-C-H
Н
B
нннн
|
|
0 — 0 — c - C - C -H
| | |
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H-C-C-
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нн
F
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H-c-
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H
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НН Н
H-c-c
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11
H- C-C — с
11
11
- C — C — C —H
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H
| | |
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Answer:
Here are the names of the esters and the corresponding alcohols and carboxylic acids that were used to make them:
1. Ethyl acetate, made from ethanol and acetic acid
2. Methyl propanoate, made from methanol and propanoic acid
3. Butyl butyrate, made from butanol and butyric acid
4. Octyl formate, made from octanol and formic acid
5. Ethyl benzoate, made from ethanol and benzoic acid
6. Ethyl propionate, made from ethanol and propanoic acid
7. Methyl butyrate, made from methanol and butyric acid
8. Ethyl butyrate, made from ethanol and butyric acid
9. Propyl formate, made from propanol and formic acid
10. Butyl propionate, made from butanol and propanoic acid.
According to the following equation, calculate the percent yield if 550.0g of toluene is added to an excess of nitric acid and provides 305g of the p-nitrotoluene product in the lad experiment.
C7H8+HNO3-->C7H7NO2+H2O
The percent yield of the reaction is 37.2%. The theoretical yield, or maximum amount of product that can be produced based on the amount of limiting reagent utilized in the reaction, must first be ascertained in order to calculate the percent yield.
What use does the percent yield serve?In chemistry, the percentage yield is used to compare the actual outcome of a reaction to the maximum outcome anticipated.
Why is yield rate crucial?Several institutions place a high value on yield because past yield data enables them to forecast the number of students they will need to accept to order to reach their enrollment goal. Fewer pupils may be admitted if the school's yield rates historically have been high.
We can use stoichiometry to calculate the theoretical yield of p-nitro-toluene:
1 mole of toluene produces 1 mole of p-nitro-toluene
The molar mass of toluene is 92.14 g/mol, and the molar mass of p-nitro-toluene is 137.14 g/mol.
550.0 g of toluene is equivalent to 5.97 moles (550.0 g / 92.14 g/mol).
Therefore, the theoretical yield of p-nitro-toluene is:
5.97 moles of p-nitro-toluene = 5.97 moles of toluene
5.97 moles of p-nitro-toluene x 137.14 g/mol = 819.9 g
we can calculate the percent yield:
Percent yield = (actual yield / theoretical yield) x 100%
In the given experiment, the actual yield of p-nitro-toluene is 305 g.
Percent yield = (305 g / 819.9 g) x 100% = 37.2%
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Rewrite the following procedure using improved scientific language and in proper format: First I broke 2 eggs into a bowl and mixed them up really good. Then I added some oil and water. After that I mixed the cake mix until everything looked the same, then it went in the oven for a bit.
The batter was then transferred to a baking dish and placed in the oven for the required baking time.
What is Carbon dioxide?
Carbon dioxide (CO2) is a colorless, odorless gas that is naturally present in the Earth's atmosphere. It is composed of one carbon atom bonded to two oxygen atoms, and is a byproduct of respiration, combustion, and other chemical reactions. CO2 is important for plant growth and is also a greenhouse gas, contributing to the warming of the Earth's atmosphere.
To prepare the cake batter, two eggs were cracked into a mixing bowl and beaten thoroughly. Next, a suitable amount of oil and water were added to the mixture. The cake mix was then slowly added and stirred until it formed a homogeneous mixture.
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Universal indicator is added to water and then nitric acid is added to the mixture.Give the colour change when nitric acid is added to the mixture of universal indicator and water.
The colour change when nitric acid is added to the mixture of universal indicator and water can range from yellow/orange to red/dark red.
Universal indicator explained.
When nitric acid is added to a mixture of water and universal indicator, the color change depends on the concentration of the acid.
At low concentrations of nitric acid, the universal indicator will turn yellow or orange, indicating a slightly acidic solution. As the concentration of nitric acid increases, the color will shift towards red, indicating a more acidic solution. At very high concentrations, the solution may turn dark red, indicating a strongly acidic solution.
The reason for this color change is that universal indicator is a pH indicator that contains a mixture of dyes that change color depending on the pH of the solution. Nitric acid is a strong acid that dissociates completely in water, producing H+ ions that lower the pH of the solution. As the pH decreases, the color of the universal indicator changes from green to yellow to orange to red.
Therefore, the color change when nitric acid is added to a mixture of water and universal indicator depends on the concentration of the acid and can range from yellow/orange to red/dark red.
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PLEASE HELPPPP
How many grams of HCl will make a solution with 100g of water saturated at 60 degrees C?
(please be quick!!!!)
110g HCl
55g of HCl
27.5g of HCl
If you want a solution that is less than saturated, the amount of HCl needed is less - in this case, 27.5g.
What is saturated?Saturated refers to a state of being filled to capacity or having reached its maximum level. In chemistry, it is used to describe a molecule or compound that has all its available bonds filled with either single or multiple bonds. It is a state of maximum solubility, meaning that no more of a substance can dissolve in a given solvent. In physical science, it can also refer to the highest temperature where a substance can exist in the liquid state without boiling.
The amount of HCl required to make a solution with 100g of water saturated at 60 degrees C depends on the concentration of the HCl solution you are trying to make. If you want to make a saturated solution, the maximum amount of HCl that can be dissolved in 100g of water at 60 degrees C is 55g. If you want a solution that is less than saturated, the amount of HCl needed is less - in this case, 27.5g.
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What type of proteins are formed by amino acids?
Polymeric proteins
Small proteins
Large proteins
Regular proteins
amino acids form polymeric proteins, which are made up of many amino acid monomers linked together by peptide bonds.
Proteins are made up of amino acids, which are linked together by peptide bonds to form long chains known as polypeptides. Polypeptide chains can fold and interact with one another to form complex three-dimensional structures known as proteins.
Proteins range in size from small proteins made up of only a few amino acids to large proteins made up of thousands of amino acids. Protein regularity varies as well, with some proteins having highly repetitive sequences and others having more irregular structures.
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A 0.545L solution of KOH has a molarity of 2.84M. How many grams of KOH were used to make this aqueous solution?
Answer: 86.68 grams KOH or 86.7 g KOH to correct sig figs
Explanation:
M= moles/L
moles = MXL
moles = 2.84 X 0.545 = 1.55 moles now multiply by the molar mass of KOH
which is 56 (from the periodic table) =
g if 39.99g naoh in 1 l of water is a 1 m solution what would the molarity be if 39.99g naoh was dissolved in 0.2 l water
The molarity of NaOH when 39.99 g NaOH was dissolved in 0.2 L of water is 5 M.
Molarity is a measure of the concentration of a solute in a solution, defined as the number of moles of the solute per liter of the solution. A mole is the amount of a substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.
For example, if you dissolve one mole of a solute in one liter of a solution, you have a one-molar solution (1 M).
The formula for molarity is, Molarity (M) = Moles of solute / Volume of solution (in liters)
The number of moles of NaOH in 1 L of water is calculated as follows:
Weight of NaOH = 39.99 g
The molar mass of NaOH = 39.99 g/mol (As said that 39.99 g of NaOH makes 1 molar solution)
The number of moles of NaOH = weight / molar mass = 39.99/39.99 = 1 mol
Molarity = the number of moles/volume of solution in liters
Molarity = 1mol / 1 L = 1 M
If 39.99 g of NaOH is dissolved in 0.2 L of water, we can calculate the molarity as follows:
Weight of NaOH = 39.99 g
The molar mass of NaOH = 39.99 g/mol
The number of moles of NaOH = weight / molar mass = 39.99/39.99 = 1.0 mol
Molarity = the number of moles/volume of solution in liters
Molarity = 1 mol / 0.2 L = 5 M
Therefore, the molarity of NaOH is 5 M.
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A beam of light distinguishes a colloid from a solution. The particles in a colloid will scatter light, making the beam..........
-visible
-invisible
-no change
-unseeable
[tex] \mathbb{ANSWER:}[/tex]
A beam of light distinguishes a colloid from a solution. The particles in a colloid will scatter light, making the beam visible.
Also, the scattering of light in a colloid is called a Tyndall Effect.This is one way to identify if a mixture is a colloid or not.A buffer solution contains 0. 337 M hydrocyanic acid and 0. 344 M sodium cyanide. If 0. 0359 moles of hydroiodic acid are added to 150 mL of this buffer, what is the pH of the resulting solution ?
The pH of the resulting solution is 8.57. In terms of moles/liter, pH is the negative logarithm of the concentration of hydrogen ions. pH expresses the nature of the solution (acidic, alkaline or neutral).
Number of HCN moles equals molarity * volume in L.
= 0.337(0.15) = 0.05055 moles
Number of NaCN moles = molarity * volume in L.
= 0.344(0.15) =0.0516 moles
HCN's Pka is 9.31.
PH = Pka + log [NaCN]/[HCN]
= 9.31 + log0.0516/0.05055
= 9.31 + 0.00893 = 9.319
After adding 0.0359 moles of HCL, the number of moles of HCN is equal to 0.05055 + 0.0359, = 0.08645 moles.
After adding 0.0359 moles of HCl, the number of moles of NaCN is equal to 0.0516-0.0359 moles, = 0.0157 moles.
PH = PKa + log [NaCN]/[HCN] = 9.31 + log [0.0157/0.08645] = 9.31 -0.74086 = 8.57
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need answer asap!! will give brainliest!
The mistake is made in step 1.
Stoichiometric problem2C4H10 + 13 O2 → 8 CO2 + 10 H2O
From the equation, we see that 2 mole of butane reacts with 13 moles of oxygen to produce 10 moles of water.
First, we need to convert the given mass of water to moles:
1500 g H2O ÷ 18.015 g/mol H2O = 83.284 mol H2O
Next, we can use stoichiometry to calculate the moles of butane required to produce this amount of water:
83.284 mol H2O × 2 mol C4H10 ÷ 10 mol H2O = 16.657 mol C4H10
Finally, we can convert moles of butane to grams:
16.657 mol C4H10 × 58.12 g/mol C4H10 = 967.79 g C4H10
Thus, the mistake in the calculation was made in the first step where the given mass of water is to be converted to moles.
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how many moles of water vapour are formed when 10 litres of butane gas, C4H10 is burned in oxygen at STP?
Answer and Explanation: 1 mole of a gas, at STP, occupies a volume of 22.4L. Hence, 10L will contain 10L / 22.4mol/L = 0.446mol of gas.
Calculate the heat change associated
with cooling a 350.0 g aluminum bar
from 70.0/C to 25.0/C. Is the change
endothermic or exothermic? Why? How to change -14,175J to -14.2kj
(-14.2 kJ)
The aluminum bar is cooling through an exothermic process, which means that heat is being released from the bar and being transported to the surroundings. This is indicated by the negative sign of the heat change.
Exothermic or endothermic change?The aluminum bar is cooling through an exothermic process, which means that heat is being released from the bar and being transported to the surroundings. This is indicated by the negative sign of the heat change (-14.2 kJ). This is due to the metal bar losing heat as it cooled down because the ultimate temperature (25.0°C) is lower than the initial temperature (70.0°C).
we can use the formula:
Q = m * c * ΔT
where Q = heat change, m = mass of the aluminum bar, c = specific heat capacity of aluminum, and ΔT = change in temperature.
The specific heat capacity of aluminum is 0.903 J/g·°C.
So, plugging in the values, we get:
Q = (350.0 g) * (0.903 J/g·°C) * (25.0°C - 70.0°C)
Q = -14,175 J
The negative sign indicates that heat is being lost by the aluminum bar,
To convert -14,175 J to kJ, we divide by 1000:
-14,175 J = -14.175 kJ
Rounding to one decimal place, we get:
-14.175 J ≈ -14.2 kJ
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What two properties are used to identify clouds?
The two properties are used to identify clouds are atmospheric height and how they look like.
Explain about the clouds and its formations?Often, factors like a cloud's height in the skies, texture, and the kind of "weather" it produces or doesn't generate are used to classify and identify it.
Cirrus clouds have a delicate, wispy appearance that frequently resembles "hair." They are usually white in hue and contain ice crystals which occasionally give the sky unusual colors.The others are more thicker and appear more gray, altocumulus clouds typically have a more white and patchy appearance. With Nimbostratus as an exception, which is generally seen as being more "low-level" due to its falling base.The lowest, most diversely characterized clouds in the sky. These clouds can extend quite far into the troposphere vertically and are likewise made of water droplets.Thus, the two properties are used to identify clouds are atmospheric height and how they look like.
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BRO LITERALLY PLEASE HELP!!!!
A solution consists of 40. 00 g of CuSO4 dissolved in 200. 0 mL of water. The molar mass of Cu is 63. 55 g/mol, the molar mass of S is 32. 07 g/ml, and the molar mass of S is 16. 00 g/mol. What is the molarity of the solution?Show your work
The molarity of the solution is 1.253 M. To find the molarity of the solution, we first need to calculate the number of moles of CuSO4 in the solution.
The molar mass of CuSO4 is
63.55 + 32.07 + (4 x 16.00 ) g/mol = 159.62 g/mol.
Next, we can use the equation moles = mass / molar mass to find the number of moles of CuSO4 in the solution.
Moles of CuSO4 = 40.00 g / 159.62 g/mol = 0.2506 mol
Finally, we can use the equation molarity = moles / volume to find the molarity of the solution.
The volume of the solution is 200.0 mL, or 0.2000 L.
Molarity = 0.2506 mol / 0.2000 L = 1.253 M
Therefore, the molarity of the solution is 1.253 M.
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The rock in a particular iron ore deposit contains 80 %; Fe2O3 by mass. How many kilograms of the rock must be processed to obtain 2800 kg of iron? Express your answer using two significant figures
Mass of rock = 5004.16kg. The mass of the elements present in the compound determines the percentage composition.
Given that the [tex]Fe_{2} O_{3}[/tex] is 80 % by mass.
It means that 80 kg of is present in 100 kg of rock
To find the mass of rock which contains 2800 kg of iron
2800 kg = 2800*1000 g
2 moles of iron are present in 1 mole of
Molar mass of iron = 55.845 g/mol
Mass of 2 moles = 55.845 * 2 = 111.69 g/mol
159.69 g/mol Molar mass of [tex]Fe_{2} O_{3}[/tex]
It implies,
In 159.69 g of iron, there are 111.69 g.
The amount of iron in 159.69/111.69 g of
There are 2800*1000 g in (159.69/111.69) *2800*1000 g of material.
Mass of [tex]Fe_{2} O_{3}[/tex] = 4003.33kg
Thus,
100 kg of rock contains 80 kg.
One kilogram of rock makes up 100/80 kg.
(100/80) *4003.33 kg of rock contains 4003.33 kg.
Mass of rock = 5004.16kg
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Use the exponential notation to express the physical quantities
a. V= 15. 50 ml to L
b. M= 5. 00mg to g
c. M= 2000 to g
d. Λ= 256. 4nm to m
If you had 9. 65 x 1026 atoms of Ag, how many moles would you have?
If you had [tex]9.65 * 10^{26[/tex] atoms of Ag, you would have [tex]1.603 * 10^3[/tex] moles of Ag.
To find the number of moles of Ag atoms you have, you need to use Avogadro's number, which is 6.022 x 10^23. This number represents the number of atoms in one mole of any substance.
To find the number of moles, you need to divide the number of atoms you have by Avogadro's number:
Number of moles = Number of atoms / Avogadro's number
Plug in the given values:
Number of moles = 9.65 x 10^26 atoms / 6.022 x 10^23 atoms/mole
Simplify:
Number of moles = 1.603 x 10^3 moles
So, if you had 9.65 x 10^26 atoms of Ag, you would have 1.603 x 10^3 moles of Ag.
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Based on the clues in the messages between Mateo in Quito and Fernanda in Philadelphia, what type of event do you think will occur in Quito, Ecuador? Use evidence from the conversation to explain your answer.
While the circular portion of this solar eclipse is not visible in Quito, a partial solar eclipse can be seen there.
What happens after a partial solar eclipse?A partial eclipse happens when the Sun and Moon are only partly blocked from Earth's view by the Moon. Typically, a sizable portion of the planet's surface outside of an annular or complete eclipse can observe this occurrence.
However, because the umbra travels above the polar areas of the Earth and never touches the Earth's surface, some eclipses can only be seen as partial eclipses. Since it requires well over 90% coverage to observe any dimming of the Sun's brightness, partial eclipses are essentially undetectable. It wouldn't be any dimmer than civil dusk even at 99%.
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Penelope's friend Joe gives her a ring for Valentine's Day, which he said is 14k white gold. Penelope's friend Daksha thinks it's actually composed of nickel. Describe a process/experiment that Penelope could conduct to find out for sure.
Dimethylglyoxime is a chemical that is present in this kit (in solution). KIT The solution will turn pink when used to clean a metal object with such a cotton swab when nickel is present in the Penelope's 14k white gold ring.
Check for the presence of nickel in white gold:White gold was first created to mimic platinum (a white metal). White gold is typically an alloy containing around 75% gold or around 25% nickel and zinc. It would be approximately 75% pure gold if it had an 18 karat stamp.
The question:
Joe, a friend of Penelope's, presents her with a 14k white gold ring on Valentine's Day. Daksha, a friend of Penelope's, believes it is truly made of nickel. Penelope may use the following procedure or experiment to determine this for sure:
You can get a nickel test kit if you're buying jewelry and are unsure if it includes nickel. Dimethylglyoxime is a chemical that is present in this kit (in solution). This chemical is used without harming the thing being evaluated.The solution turns pink when used to clean a metal object with such a cotton swab when nickel is present. This test may not detect trace levels of nickel, but it is typically a reliable jewelry detector.Know more about white gold
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N₂(g) + 3 H₂(g) 2 NH3(g)
What mass in grams of ammonia (NH3) would the experiment produce if Brett uses
3 moles of nitrogen gas (N₂) and an excess of hydrogen?
5.7 g NH3
O 102 g NH3
17 g NH3
51 g NH3
The experiment would produce 102.18 g of ammonia. The answer is closest to 102 g NH₃.
Steps
The balanced chemical equation for the reaction is:
N₂(g) + 3H₂(g) → 2NH₃(g)
In this equation, the stoichiometric ratio of nitrogen gas to ammonia gas is 1:2. Accordingly, 2 moles of ammonia gas are created for every 1 mole of nitrogen gas that reacts.
As a result of using 3 moles of nitrogen gas, Brett will generate 2 x 3 = 6 moles of ammonia gas.
From the equation, we can see that for every 1 mole of nitrogen gas (N₂) used, 2 moles of ammonia (NH₃) will be produced. Therefore, if 3 moles of N₂ is used, the number of moles of NH₃ produced will be:
moles of NH₃ = (3 moles N₂) x (2 moles NH₃ / 1 mole N₂) = 6 moles NH₃
To calculate the mass of NH₃ produced, we need to use its molar mass, which is 17.03 g/mol. Therefore:
mass of NH₃ = (6 moles NH₃) x (17.03 g/mol) = 102.18 g NH₃
So, the experiment would produce 102.18 g of ammonia. The answer is closest to 102 g NH₃.
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Remember when you calculated the amount of water from Hurricane Isabel? Using the numbers you calculated, determine the total amount of heat released by the condensing water. You need to know that the energy released in the condensation of 1 kg of water vapor into 1 kg of liquid water is 2,260 kJ.
The energy released when 1 kg of water vapor condenses into 1 kg of liquid water is known as the heat of condensation, and it has a value of 2,260 kJ/kg. This means that for every kilogram of water vapor that condenses, 2,260 kJ of energy is released as heat.
How to calcalculate total amount of heat?
To calculate the total amount of heat released by the condensing water from Hurricane Isabel, we first need to know the total amount of water that was present in the hurricane. Once we have this value, we can multiply it by the heat of condensation (2,260 kJ/kg) to find the total amount of heat released.
For example, if the total amount of water from Hurricane Isabel was 1,000 kg, then the total amount of heat released would be:
Total heat released = 2,260 kJ/kg x 1,000 kg = 2,260,000 kJ
Therefore, the total amount of heat released by the condensing water from Hurricane Isabel depends on the amount of water that was present in the hurricane, and we need this information to make a specific calculation.
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