Emerald can be described as a transparent, green coloured gem stone made up of mineral beryl together with trace amount of chromium or sometimes vanadium having chemical formula as [tex]Be_3Al_2(SiO_3)_6[/tex] .
Through time, the emerald has been known as a symbol of truth and love.
In ancient Greece and Rome, emerald was said to be the gemstone of the goddess Venus, purveyor of love and hope.
On the other side of the world, emeralds were revered by the Incas and believed by the Egyptians to be a source of eternal life.
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As you know, liquid hydrazine (N2H4) can be used as a rocket fuel. A rocket you designed has a total of 1.35E5 g of hydrazine when it loses power just beyond the atmosphere of Earth. It is on the dark side of the Earth at the time, and the external temperature is 116 K. By the time you notice, the internal temperature of the rocket (and the rocket fuel) has also reached 116 K. How much heat must be applied (in J) to the fuel to warm it back to its operating temperature of 298 K
The heat required to warm the fuel back to it's operating temperature is 3.83×10⁷ J
Data obtained from the question Mass (M) = 1.35×10⁵ g = 1.35×10⁵ / 1000 = 135 KgInitial temperature (T₁) = 116 KFinal temperature (T₂) = 298 KSpecific heat capacity (C) = 1559.45 J/KgK Heat (Q) =?How to determine the heat requiredThe heat required to warm the fuel can be obtained as follow:
Q = MC(T₂ – T₁)
Q = 135 × 1559.45 × (298 – 116)
Q = 135 × 1559.45 × 182
Q = 3.83×10⁷ J
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2 NH3 + 3 CuO →3 Cu + N₂ + 3 H₂O
In the above equation, how many grams of N₂ can be made when 4.3 moles of CuO are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element Molar Mass
Hydrogen 1
Nitrogen 14
Copper 63.5
Oxygen 16
40.1g of nitrogen gas is produced.
The equation given is
2 NH₃ + 3 CuO →3 Cu + N₂ + 3 H₂O
This equation is already balanced.
When 3 moles of CuO are consumed, 1 mole of nitrogen gas is produced.
We get 1 mole of nitrogen from 3 moles of copper oxide.
We need to find the number of moles of nitrogen gas produced when 4.3 moles of copper oxide are consumed.
4.3/3 x 1 = 1.433 mols
1.433 mols of nitrogen gas are producedThe molar mass of nitrogen gas is 14+14 = 28gThe amount of nitrogen gas produced in grams is 28x1.433 = 40.1g40.1g of nitrogen gas can be made when 4.3 moles of CuO are consumed.
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The expression caco3 → cao co2 is an example of a reactant. product. chemical equation. chemical progression.
Chemical equation
What is a chemical equation?The reactants and products of a chemical reaction are represented symbolically in a chemical equation by the appropriate chemical formulas.A chemical equation that illustrates how Calcium oxide (quicklime) and carbon dioxide are produced during the breakdown of limestone.CaCo3 → CaO+ CO2 (Decomposition reaction)
The portion of the chemical equation on the reactant side is to the left of the symbol "→," and the portion on the product side is to the right of the arrow symbol.Decomposition reaction:-A chemical reaction that results in the breakdown of one reactant into two or more products is known as a decomposition reaction.
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Answer:
chemical equation
Explanation:
How many moles of propane
react when 294 g of CO2 form?
C3H8 +502 3CO2 + 4H₂O
?] mol C3H8
helpp im timed Part A
Fill a clear glass or resealable plastic bag three-fourths full with water. Place the pencil in the water, and hold it vertically without spilling. Look at the pencil from the side. Describe what you see.
Part B
Tilt the pencil from side to side while continuing to look at it from the side. Describe what you see.
Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.
What is refraction ?
It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.
Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.
When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.
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Answer:
Explanation:
Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.
What is refraction ?
It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.
Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.
After Looking at the pencil from the side of a clear glass or resealable plastic bag filled three-fourths with water, we will see the light bends around the pencil, causing it to look bent in the water.
When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.
We can magically “fix” the broken pencil by changing where the pencil is positioned in the glass.
Explain how the moon causes high and low tides.
Answer:
gravitational pull generates something called tidal force.
Explanation:
High and low tides are caused by the moon. the moons gravitational pull generates tidal force.
What is the weighted average of a
bean in the sample data given?
Sample Number
of Beans
Black
Eyed Peas
Cannellini
Beans
410
90
Abundance Mass
(%)
(g)
1.32
82
18
2.94
Weighted
Average (g)
[?]
Answer: 1.6116
Explanation:
[tex](1.32)(0.82)+(2.94)(0.18)=\boxed{1.6116}[/tex]
The weighted average of a bean in the given sample data is equal to 1.6116 g.
What is the Weighted Average?The weighted average can be described as a calculation that takes into account the varying degrees of importance of the numbers in a data set. Each number is multiplied by a predetermined weight in the given data set before the final calculation is made in calculating a weighted average.
A weighted average assigns weights that calculate in advance the relative abundance of each data point. A weighted average is commonly determined to equalize the frequency of the values in a data set.
Given the abundance of Black eyes peas, m₁ = 82% = 0.82
The mass of the Black eyes peas, W₁ = 1.32 g
the abundance of cannellini beans, m₂ = 18% 0.18
The mass of cannellini beans, W₂ = 2.94 g
The weighted average = m₁W₁ + m₂W₂ = 1.32× 0.82 + 2.94 ×0.18
The weighted average of a bean = 1.6116 g
Therefore, the weighted average of a bean in the sample is 1.6116 g.
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DESPERATE NEED OF HELP
Answer:
the answer will be false.
Explanation:
because it is not balanced.
What kind of nuclear reaction is seen in (image)?
Answer:
Beta decay
Explanation:
A beta particle (also known as an electron) is being emitted from the nuclide.
Which chemical name is correctly paired with the chemical formula?
tin(IV) bromide, SnBr4
aluminum fluorate, AlF3
iron(II) oxide, Fe2O3
potassium chloride, K2Cl2
Answer:
Tin bromine = Snbr2
aluminum fluorate = AlFe3
iron oxide = Fe2o3
potassium chloride = KCL or 2KCL = K2CL2
All Pairs are correct
Which phrase describes a homogeneous catalyst?
Answer:
It is in the same phase as the reactants.
Explanation:
i took the test
What are the five (5) things that can indicate a chemical change has occurred?
Write out the combinations that indicate a chemical change, explain how you know.
Answer: Bubbles, burning, odor, color change, and rusting.
Explanation: Chemical changes are changes to something that is irreversible.
Which of the following questions would be answered by performing a scientific experiment?
A.
What type of food is the most enjoyable?
B.
What type of food is the most nutritious?
C.
What type of food looks the best?
Did you write these compounds?
KBr
2 NH₂OH
2HNO3
The missing components of the neutralisation reaction include the following:
KBr KBr 2NH4OHKBr 2NH4OH2HNO2What is neutralisation reaction?Neutralisation reaction is defined as the type of reaction that leads to the formation of salt and water when an acid and a base reacts.
From the reactions given the missing components are replaced as follows:
HBr + KOH --> KBr + H2OH2SO4 + 2NH4OH --> (NH4)2SO4 + 2H2O2HNO3 + Mg(OH)2 --> Mg(NO3)2 + 2H2OLearn more about acids here:
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PROBLEMS
1. What is the molarity of 4 grams of NaOH dissolved in 1 liter of solution?
2. What is the molarity of 4 grams of NaOH dissolved in 0.5 liter of solution
3. What is the molarity of 4 grams of NaOH dissolved in 0.1 liter of solution
4. Which of the 3 solutions above is more concentrated and why?
Answer:
1.) 0.1 M
2.) 0.2 M
3.) 1 M
4.) Solution #3 is the most concentrated because it has the highest molarity. This solution has the largest solute to solvent ratio. The more solvent there is, the lower the concentration and molarity.
Explanation:
To find the molarity, you need to (1) convert grams NaOH to moles (via molar mass from periodic table) and then (2) calculate the molarity (via the molarity equation). All of the answers should have 1 sig fig to match the given values.
Molar Mass (NaOH): 22.99 g/mol + 16.00 g/mol + 1.008 g/mol
Molar Mass (NaOH): 39.998 g/mol
4 grams NaOH 1 mole
---------------------- x ------------------ = 0.1 moles NaOH
39.998 g
1.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (1 L)
Molarity = 0.1 M
2.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (0.5 L)
Molarity = 0.2 M
3.)
Molarity = moles / volume (L)
Molarity = (0.1 moles) / (0.1 L)
Molarity = 1 M
the volume of a 300 L sample of CO2(g) at 2.30 atm is compressed to 29.6 L, what
is the new pressure at constant temperature and moles?
Answer:
23,31 atm
Explanation:
p1v1 = p2v2
2.3 * 300 = p2 *29.6
p2=23.31 atm
Considering the combustion reaction of propane again, what mass of propane (C3Hg) is necessary to react with 4.53 g of oxygen? C3H8 +5023CO₂ + 4H₂O 0.0256 g C3H8 1.13 g C3H8 1.25 g C3H8 2.50 g C3H8
Answer:
1.25 g C3H8
Explanation:
edge lol
explain why nickel has a high density.
Density Of A Nickel:-
8.902 (25°C)
Explanation of why does nickel have a high density:-
Nickel is the only element named after the devil. The name comes from the German word Kupfernickel, meaning "Old Nick's copper," a term used by German miners. They tried to remove copper from an ore that looked like copper ore, but they were unsuccessful. ... Nickel is also used in the manufacture of many other alloys.
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What is a spring tide? When and why does it occur?
A spring tide occurs when there is a new or full moon in the solar system.
What is Spring tide?This is the type of tide which occurs when the sun, moon and earth are in line and occurs between three to four times per year.
Lunar and solar tides also line up and reinforce each other to produce this type of tide.
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During the distillation nitrogen gas is obtained first, then argon and oxygen. What can u say about the boiling points of these three gases?
Explanation:
The boiling point of liquid nitrogen, liquid argon, and liquid oxygen are -196°C, -186°C, and -183°C respectively. So, the correct order is nitrogen, argon, oxygen.
Nitrogen:
Since you don't want nitrogen to be condensing everywhere when it gets cold out, elemental nitrogen's boiling point is luckily below zero degrees Celsius. Thank goodness for nitrogen's extremely low boiling point. If it were at zero, boiling water would not produce a lot of heat, necessitating the use of a pressure cooker to prepare foods that typically call for boiling water. Additionally, since the air would be substantially enhanced with oxygen, items may catch fire more quickly (i.e. your home might burst in flame that much more easily). An ugly picture, to be sure.
Argon:
As nonpolar gases, Ar, F2, and Cl2 only display London Dispersion Forces (LDF). These largely negligible forces, which are the product of transient dipoles, must be resisted throughout the boiling process. Since bigger atoms and molecules have valence electrons further from their nucleus, LDF intensity is also directly correlated with atomic or molecular size. Compared to smaller atoms or molecules, these outermost electrons are less attracted to the positive nucleus or nuclei, making it simpler for them to create transient dipoles. As a result, the differing molar masses of each compound—Ar—39.95 g/mol, F—38.00 g/mol, and Cl—70.90 g/mol—can be used to explain the variation in boiling points.
Oxygen:
At 1 atm, oxygen would boil at -183 degrees Celsius if it were a liquid. Although the phase diagram for oxygen is more intricate than this, it is a general phase diagram. Imagine that the term "vaporization" is at the same height as 1 atm, which is roughly halfway up the y-axis. If the y value at that time was equal to 1 atm, the "vaporization" arrow to the right would be directly above -183 degrees Celsius. It's crucial to remember that pressure determines what temperature a substance will boil, melt, condense, or freeze, as you can probably guess. Additionally, the pressure in particular circumstances can affect what phase a material is in.
NiSe2 + Ca3(PO4)2 = Ni3(PO4)2 + CaSe
balance please
Help pls!!
The table compares the number of electrons in two unknown neutral atoms.
Comparison of Electrons
Atom Number of Electrons
A 10
D 11
Use this information to determine the number of valence electrons in the atoms. Which of the following correctly compares the stability of the two atoms?
A Both are unreactive.
B Both are highly reactive.
C A is unreactive and D is reactive.
D A is reactive and D is unreactive.
Answer: A is unreactive and D is reactive.
Explanation:
A is neon, which is a noble gas, and thus unreactive.
D is sodium, which is an alkali metal, and thus highly reactive.
What conditions make AG always positive?
Answer: when a reaction absorbs heat or decreases the entropy of the system,
Explanation: :)
10. What are the four steps in the scientific method?
HELP FAST!!!!!!!
Which two groups have the same functional group?
O A. Amines and alcohols
B. Aldehydes and esters
C. Ketones and aldehydes
D. Esters and ethers
Answer:
C. Ketones and aldehydes
Explanation:
they are both carbonyl functional group
they both have a carbon-oxygen double bond
testosterone is an example of a ketone
formaldehyde is an example of a aldehyde
opentextbcca
wikipedia
Answer:
Ketones and Aldehydes
Explanation:
i just took tha test
A year has 365 day and a day has 24 hours. if an hour has 60 minutes and a minute has 60 seconds how many seconds are in a year
Answer:
31536000
Explanation:
There are 31536000 seconds in a day.
60s x 60min x 24hrs x 365 days = 31536000sec
A group of students working in a chemistry lab are planning a procedure to
neutralize hydrochloric acid (HCI, strong acid). How should they BEST accomplish
this?
use a strong base to neutralize, like NaOH, KOH, etc
Which term describes this reaction?
Answer:
addition polymerization
Explanation:
Please help, need it for homework
Answer:
n
Explanation:
nobody knows
A student was given a mixture of iron of iron fillings and sulphur. He was told to heat it and observe the compound.
(a) What is coloured formed.
(b) Write the effect of magnet on it.
(c) Write the action of carbon disulphide on it.
(d) Describe the effect of adding dilute hydrochloric acid to it. ldentify the gas and write its two properties.
The observations are as follows:
black iron sulfide is formed iron sulfide is not magnetic No reaction observed with carbon sulfidehydrogen gas is evolved What is the product of the reaction of iron fillings and sulfur when heated?When a mixture of iron fillings and sulfur are heated, black iron (ii) sulfide is formed.
Unlike iron fillings, black iron (ii) sulfide is not attracted to a magnet.
When carbon sulfide is added to it, no visible reaction is observed.
When dilute hydrochloric acid is added to it, a gas with a rotten-egg smell is evolved.
The gas is hydrogen sulfide which is a reducing agents and acidic in nature.
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