Answer:
The answer is C: KCN
Explanation:
KCN is a strong electrolyte. Electrolytes is inside your body to renergize you and help you stay strong.
A balloon takes up 625 L at 0°C. If it is heated to 80°C, what will its new volume be?
Answer:
Me gusta tu corte G
Explanation:
Pls, Answer ASAP!!!! I have to turn in my HW in 20 mins!!
In the rocket fuel formulation for NASA, 325 grams of solid aluminum (Al) particles are heated with 211 grams of solid iron III oxide (Fe2O3). Show all work and units. Include significant figures in your final answer.
a) Write the balanced equation
b) Calculate the mass of iron produced from the reaction
c) Identify the limiting reagent
d) Determine the amount of excess reactant leftover
Show all work and units. Include significant figures in your final answer.
Answer:
B. Calculate the mass of iron produced from the reaction
Explanation:
Sana makatulong mark me as a brainliest
A 150.0 mL sample of 0.20 M HF is titrated with 0.10 M LiOH. Determine the pH of the solution after the addition of 600.0 mL of LiOH. The Ka of HF is 6.8 × 10-4.
Answer:
pH = 12.6
Explanation:
The HF reacts with LiOH as follows:
HF + LiOH → LiF + H₂O
To solve this question we need to find the moles of each reactant:
Moles HF:
0.1500L * (0.20mol / L) = 0.030 moles HF
Moles LiOH:
0.600L * (0.10mol / L) = 0.060 moles LiOH
That means there is an amount of LiOH in excess, that is:
0.060 mol - 0.030 mol = 0.030 moles LiOH
In 600.0mL + 150.0mL = 750.0mL = 0.750L
The molarity of LiOH is:
0.030 moles LiOH / 0.750L =
0.040M LiOH = [OH⁻]
As:
Kw = 1x10⁻¹⁴ = [H⁺] [OH⁻]
1x10⁻¹⁴ = [H⁺] [0.040M]
2.5x10⁻¹³M = [H⁺]
As pH = -log [H⁺]
pH = 12.6A company that is concerned about the environment wants to encourage the use of their fuel cell cars, so they are putting
together information to help sell the cars. They want to be sure their material is accurate. Which piece of information is
true about fuel cell cars?
O Fuel cell cars are cheaper to buy. Fuel cell cars reduce use of non-renewable fossil fuels
Fuel cell cars are more powerful than gasoline-powered vehicles.
Fuel cell cars allow for the safe storage of hydrogen gas at filling stations.
Answer:
B. Fuel cell cars reduce use of non-renewable fossil fuels
Explanation:
8. Which of the following is an example of a phase?
O water vapor
O temperature
O triple point
O pressure
Explanation:
8. Qual das alternativas a seguir é um exemplo de fase?
O vapor de água
OTemperatura
O ponto triplo
O pressão
resposta o valor de água
The volume of Mars is more than three times as large as Mercury's.
Answer:
Ye,,it is true that Mars is bigger than mercury.
Explanation:
Actually,Mercury is the smallest planet in the solar system.
What is the percent composition of acetaminophen (C8H9NO2).
Answer: %C = 63.5%, %H = 6.00%, %N = 9.3%, %O = 21.2%
Percent composition is quite straightforward. You can determine by mass how much of each element is contained in a compound using its percent composition. A chemical compound is created when two or more components are combined. % composition of acetaminophen is %C = 63.5%, %H = 6.00%, %N = 9.3%, %O = 21.2%.
The percentage composition of a compound is defined as the mass of each element divided by the total mass of the compound multiplied by 100%. Therefore, a compound's percentage composition lets you know what proportion of its mass is made up of each element.
The total mass of acetaminophen = 151.16 g
%composition is:
Mass of element / total mass of compound × 100
%C: 12 × / 151.16 × 100 = 63.5%
%H: 1 × 9 / 151.16 × 100 = 6.00%
%N: 14 / 151.16 × 100 = 9.3%
%O: 16 × 2 / 151.16 × 100 = 21.2%
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6. How many planets are in the solar system?
Answer:
8
Explanation:
Rocky planets:
Mercury
Venus
Earth (We are here)
Mars
Gas giants:
Jupiter
Saturn
Uranus
Neptune
Hi!there are 8 planets in the solar system they are=
MercuryVenusEarthMarsSaturnJupiterUranusNeptune(there was one more planet Pluto but in 2006 scientists said that Pluto was not a planet but a drawf planet)
what are salt properties of matter?
Answer: Salt is a chemical compound with a number of interesting properties: Crystals or white crystalline powder. Transparent and colourless in crystalline form – rather like ice. Crystallises in the isometric system, usually in the form of cubes.
Answer:
Salt is a chemical compound with a number of interesting properties: Crystals or white crystalline powder. Transparent and colourless in crystalline form – rather like ice. Crystallises in the isometric system, usually in the form of cubes.
Explanation:
give the first answer brainliest, im just fixing thier spelling
what is the mass of potassium chloride when 2.50 g of potassium reacts with excess of chlorine gas
Answer:
4.52 grams of potassium chloride
Explanation:
First you need a balanced reaction equation K(s) + Cl₂ (g) --> 2 KCl(s). Since the chlorine gas is said to be in excess all of the potassium will be converted to form potassium chloride. Convert grams of potassium to moles of potassium with the periodic table, then you can convert moles of potassium to moles of potassium chloride with the balanced equation, finally convert moles of potassium chloride to grams of potassium chloride with the periodic table. Set up a dimensional analysis chart to help with conversions
(2.50 grams K) * (1 mole K) * (2 mole KCl) * (35.45 grams KCl)
(39.09 grams K) (1 mole K) (1 mol KCl)
Which equals 4.52440778 grams, with sig figs it should be 4.52 grams of potassium chloride
How many grams are of sodium chlorate are present in a 2.45 mole sample?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles NaCl, or 58.44277 grams.
Explanation:
I hope this helps!!
Answer:
260 grams sodium chlorate
Explanation:
moles to grams multiply by formula weight.
grams to moles divide by formula weight.
sodium chlorate => NaClO₃
=> formula wt = Na + Cl + 3O = [1(23) + 1(35) + 3(16)]g/mole = 106g/mole
∴ grams NaClO₃ = 2.45 mole x 106 g/mole = 259.7 grams ≈ 260 grams
What is the percent by mass of iron in FeCl 3 ?
Answer:
34.429%
Explanation:
describe the Solvay process
Select ALL that apply.
What factors affect wave height?
Lesson 2.14
Fetch
Strength of wind
Direction of the wind
Duration of wind
The factors affect wave height is the duration of the wind
Answer:
all answers are correct
Fetch
Strength of wind
Direction of the wind
Duration of wind
Explanation:
i took the quiz hope this helps!
2 spaceships are in deep space. The distance between the centers of mass of the two spaceships is 300 m, and the force between them is 5.51×10^-7N. If one spaceship has a mass of 24,000 kg, what is the mass of the other spaceship?
Answer:
Mass of the second spaceship is 3.10 × 10⁴ kg 0r 31000 kg
Explanation:
From Newton's law of universal gravitation, the force of attraction , F, between two bodies is directly proportional to the product of their masses and inversely proportional to the square root of the distance between them.
F = Gm₁m₂/d²
m₁ = 24000 kg
m₂ = ?
d = 300 m
F = 5.51 × 10⁻⁷ N
Gravitational constant, G = 6.67 × 10⁻¹¹ N.m²/kg²
Making m₂ subject of the formula : m₂ = F × d² / G × m₁
m₂ = 5.51 x 10⁻⁷ × 300 × 300 / 6.67 × 10⁻¹¹ × 24000
m₂ = 3.1 × 10⁴ kg
Therefore, Mass of the second spaceship is 31000 kg
find the limiting reagent if 0.25 moles of Co2 react with 0.1 moles of KO2
Answer:
KO₂ is limiting reactant
Explanation:
Based on the balanced reaction:
2CO₂ + 4KO₂ → 2K₂CO₃ + 3O₂
2 moles of CO₂ react with 4 moles of KO₂.
Thus, for a complete reacction of 0.25 moles of CO₂ are required:
0.25 moles * (4moles KO₂ / 2moles CO₂) = 0.5 moles of KO₂
As there are just 0.1 moles:
KO₂ is limiting reactantOrganisms breakdown _____ in order to produce____?
Answer: Organisms breakdown __into smaller particles___ in order to produce__new compounds__?
Explanation:
branliest pls :)
what happens to the earth's oceans because of #8
Explain in your own words what biodiversity is.
Answer:
Biodiversity: Bio meaning life and diversity meaning variety. This word refers to the different variations of life that can be found on Earth (plants, animals, micro-organisms, fungi).
Explanation:
Please help fast! I will give brainliest.
Explanation:
27.0*C OPTION . GLAD IT HELPS
1. How many atoms are present in 64.0g of Oxygen?
The number of atoms present in 64.0g of Oxygen are 24.092 × 10²³.
What are atoms?
Atoms are the number of molecules that are present in an element. The atoms will be of the same species or different species. Atoms also contain charged particles that constitute the atomic number or atomic mass.
The molar mass of oxygen is 16 grams, which means that 1 mole of oxygen weighs 16 grams.
Therefore, 64-gram oxygen
To calculate the moles, the mass is divided by the molar mass
Putting the value in the formula
64/16 = 4 mole oxygen.
1 mole of any element contains 6.022 x 10²³ atoms in it.
The number of Oxygen atoms in 64 grams of Oxygen gas is
24.088 × 10²³ = 24.092 × 10²³
Thus, the atoms present in 64.0g of Oxygen are 24.092 × 10²³.
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Imagine that you are in chemistry lab and need to make 1.00 L of a solution with a pH of 2.60.
You have in front of you
100 mL of 6.00×10−2 M HCl,
100 mL of 5.00×10−2 M NaOH, and
plenty of distilled water.
You start to add HCl to a beaker of water when someone asks you a question. When you return to your dilution, you accidentally grab the wrong cylinder and add some NaOH. Once you realize your error, you assess the situation. You have 80.0 mL of HCl and 87.0 mL of NaOH left in their original containers.
Assuming the final solution will be diluted to 1.00 L , how much more HCl should you add to achieve the desired pH?
Express your answer to three significant figures and include the appropriate units.
Answer:
15.1 mL of the HCl solution should be added
Explanation:
First off, let's use the definition of pH to find the desired number of H⁺ moles:
pH = -log[H⁺]
2.80 = -log[H⁺]
= [H⁺]
[H⁺] = 1.58 x 10⁻³ M
Then we use the definition of Molarity [C=n/V]:
[H⁺] = 1.58 x 10⁻³ M = molesH⁺ / 1.00 L
molesH⁺ = 1.58 x 10⁻³
So in the end there needs to be 1.58 x10⁻³ moles of H⁺ to achieve the desired pH.
Now let's calculate the added amounts of HCl and NaOH
mL HCl = 100 - 84 = 16 mL = 0.016 L
mL NaOH = 100 - 88 = 12 mL = 0.012 L
mol HCl = 0.016 L * 7.00x10⁻² M = 1.12x10⁻³ mol HCl = mol H⁺
mol HCl = 0.012 L * 5.00x10⁻² M = 6.0x10⁻⁴ mol NaOH = mol OH⁻
OH⁻ reacts with H⁺, producing water. So the moles of H⁺ remaining in the solution are:
1.12x10⁻³ - 6.0x10⁻⁴ = 5.2x10⁻⁴ mol H⁺
This means that the moles of H⁺ that we need to add are:
1.58x10⁻³ - 5.2x10⁻⁴ = 1.06x10⁻³ mol H⁺
Finally we calculate the required volume of HCl:
C = n/V
7.00 x10⁻² M = 1.06x10⁻³ mol H⁺ / V
V = 0.0151 L = 15.1 mL
Pls help i have no clue what the right answers are
Tell me facts about speed of the curiosity rover. Or any facts about curiosity rover
Answer:
speed= 0.14km/h
Explanation:
it is 9 feet 10 inches long by 9 feet 1 inch wide
has 4 main science goals
-Determine whether life arose on Mars
-Characterise the climate of Mars
-characterise the geology of Mars
-prepare for human exploration
Which event would most likely cause an ecosystem to have the lowest biodiversity and population sizes 3 years later?
O A lava flow creates a new section of land
O A forest fire destroys the plant growth
O A river floods a cornfield
O Clearing land for a highway
Answer:
Clearing Land for a highway
Explanation:
The other examples are that of naturally occurring disasters and most life in that region have ways to regrow and repopulate in the case of those disasters. While a highway is a manmade object and interrupts the environment to the point that the new animals will not know how to deal with it. That is also why there are a lot of dead deer are found on the side of the road when a new highway is built.
Clearing land for a highway would most likely cause an ecosystem to have the lowest biodiversity and population sizes 3 years later. Therefore, option D is correct.
What is biodiversity ?Biodiversity refers to the variety of life that can be found in a given area, including animals, plants, fungi, and even microorganisms such as bacteria. Each of these species and organisms collaborate in ecosystems to maintain balance and support life, much like an intricate web.
Every one of these exists in delicate balance and lives and works together in ecosystems to sustain and support life on Earth.
Typically, three levels of biodiversity are discussed: genetic diversity, species diversity, and ecosystem diversity. Genetic diversity refers to the various genes found in all plants, animals, fungi, and microorganisms. It can occur both within and between species.
Thus, option D is correct.
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Ammonia is often formed by reacting nitrogen and hydrogen gases. How many liters of ammonia gas can be formed from 12.1 L of hydrogen gas at 99.0"C and a pressure of 49.3 Pa?
7.73
XL
Submit Answer
Yeah
Answer:
You can download answer here
linkcutter.ga/gyko
Explanation:
What phase change occurs when a solid changes into a gas?
Answer:
Sublimation
Explanation:
Sublimation is the term used to describe when a solid "skips" the liquid phase and turns directly into a gas from solid form. Dry ice demonstrates sublimation when exposed to room temperature air.
.
How many moles are there in 8.5 x 1024 molecules of sodium sulfate, Na2SO4?
Answer: To solve this question, we need to use the Avogadro's Number, which is a constant first discovered by Amadeo Avogadro, an Italian scientist. He discovered that in a mole of a substance, there are 6,02*10²³ molecules. Using this relationship, we apply the following conversion factor:
So, 8,50 * 10²⁴ molecules of Na₂SO₃ represent 14,12 moles of Na₂SO₃
Explanation:
The number of moles is equal to 14.1 moles in 8.5 × 10²⁴ molecules of Na₂SO₄.
What is Avogadro's number?Avogadro’s number can be demonstrated as the number of particles in one mole of any substance. Generally, these units can be ions, molecules, atoms, electrons, or protons, depending upon the reaction or reactant and product.
The value of Avogadro’s constant is calculated approximately equal to 6.022 × 10²³ per mole. This number was named after the name of scientist Amedeo Avogadro.
Given, the molecules of the sodium sulfate = 8.5 × 10²⁴
One mole of sodium sulfate (Na₂SO₄) has molecules = 6.022 × 10²³
So, 6.022 × 10²³ molecules of sodium sulfate = 1 mole
8.5 × 10²⁴molecules of Na₂SO₄ has moles =8.5 × 10²⁴/6.022 × 10²³
The number of moles of sodium sulfate = 14.2 mol
Therefore, 14.1 moles of sodium sulfate in 8.50 × 10²⁴ molecules of Na₂SO₄.
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What would the molarity of a solution be if you took 10 mL of a 13 m stock solution and made it 300 mL solution
Answer:
0.43 M
Explanation:
Use the dilution equation: M1V1 = M2V2
M1 = 13 M
V1 = 10 mL
M2 = ?
V2 = 300 mL
Solve for M2 --> M2 = M1V1/V2
M2 = (13 M)(10 mL) / (300 mL) = 0.43 M
_C2H6O + _O2 ---> _CO2 + _H2O
A) 1, 2, 3, 3
B) 1, 2, 1, 2
C) 1, 3, 2, 3
D) 1, 2, 3, 2