Answers
Answer:
Option C, 3 molecule is correct
Explanation:
The formula is of Ferric oxide
3Fe2O3
The number 3 ahead the chemical formula represents the number of molecules of the given substance. In general the formula of iron (III) oxide is Fe2O3
Since there are three molecules of it hence the formula is written as 3Fe2O3
Option C, 3 molecule is correct
Related Questions
Which reaction results in the GREATEST increase in entropy?
A)
(diamond)— Сgraphite)
B)
CO2(s) — CO2(g)
C)
H2O(s) — H20(5)
D)
2H2(g) + O2(g) → 2H2O(1)
Answers
Atoms bond by ______ electrons.
O gaining
O sharing
O losing
O all of the above
Answers
The picture shows a plant that lives in Florida.
This plant lives in other parts of the United States, too. It has a longer growing season in Florida than it does in northern areas of the country,
Which sentence best describes how Florida's warmer weather and longer growing season will affect this plant?
A. It will lose its leaves much sooner than northern plants.
B. It will produce fewer flowers than northern plants.
C. It will not be able to migrate like northern plants.
D. It will have a much shorter dormant period than northern plants.
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Answers
Answer:
I think its D. Sorry if I'm wrong
Explanation:
A block of metal has a mass of 18.361kg and the following dimensions: 22.35 cm x 7.34 cm x 22.05 mm. What is the density of the metal in g/cm^3
Answers
Answer:
50.76 g/cm³
Explanation:
We'll begin by converting 18.361 Kg to g. This can be obtained as follow:
1 Kg = 1000 g
Therefore,
18.361 Kg = 18.361 Kg × 1000 g / 1 Kg
18.361 Kg = 18361 g
Next, we shall express the dimension in the same unit of measurement.
Dimension = 22.35 cm x 7.34 cm x 22.05 mm
Thus, we shall convert 22.05 mm to cm. This can be obtained as follow:
10 mm = 1 cm
Therefore,
22.05 mm = 22.05 mm × 1 cm / 10 mm
22.05 mm = 2.205 cm
Thus, the dimension is 22.35 cm x 7.34 cm x 2.205 cm.
Next, we shall determine the volume of the metal. This can be obtained as follow:
Dimension = 22.35 cm x 7.34 cm x 2.205 cm.
Volume = 361.728045 cm³
Finally, we shall determine the density of the metal. This can be obtained as follow:
Mass of metal = 18361 g
Volume of metal = 361.728045 cm³
Density of metal =?
Density = mass / volume
Density of metal = 18361 / 361.728045
Density of metal = 50.76 g/cm³
Please solve this fast pleasee i will make u the brainliest
I – FILL IN THE BLANKS:-
1. _____________plastics can be melted by heating and thereafter moulded into desired
shape.
2. Melamine and Bakelite are examples of____________________________.
3. _________________ absorbs sweat.
4. ______________are used for making toothbrush bristles.
5. _____________type of plastic is used for making grocery bags.
6. _____________type of plastic is used for making microwave cooking containers.
7. __________ fibres are obtained from plant and animals.
8. Synthetic fibres are acquired from __________ products.
9. Polythene is the polymer of __________.
10. __________ was the first artificially manufactured fibre.
11. Polyesters are extremely __________ and __________.
12. __________ is used as an alternative for expensive, warm cashmere clothes.
13. The polymer cellulose is made up of a large number of __________ units.
14. Silk fibre is obtained from __________ whereas artificial silk is obtained by chemical
treatment of __________
15. Polythene which is used to make polythene bags is an example of a __________.
16. Plastics do not react with _______________ and ____________________.
17. Plastics are generally ______________-____ than metals.
18. __________ is a special plastic on which oil and water do not stick.
19. We should always remember the 5R principle: __________, __________, __________,
Answers
2. Thermosetting plastics
4. Nylon
5. Thermoplastics like polythene
6. Thermosetting plastics like melamine
7. Natural
8. Raw
11. Light and durable
13. repeating subunits
14. Naturally from silkworms
15. Thermoplastics
16. Air and water
17. Less-reactive
18. Poly-tetra-fluoroethylene ptfe
Please I need help with this question.
Answers
Answer:
c?
Explanation:
Answer:
b
Explanation:
34.1 g sodium nitrate is dissolved in water to
make 816 g of solution.
What is the percent sodium nitrate in the
solution?
1. 4.36117%
2. 4.17892%
3. 100%
4. 0.0117892%
Answers
Answer:
2.4.17892
Explanation:
34.1/816×100=4.17892
Hello!
please help me!
The nerve gas phosgene decomposes according to COC12(g) - CO(g) + Cl2(g), K = 0.32 at 1000 K. If
the initial concentration of phosgene is 0.015 M. what are the equilibrium concentrations of all gases?
Answers
Answer:
[tex][CO]=[Cl_2]=0.01436M[/tex]
[tex][COCl_2]=0.00064M[/tex]
Explanation:
Hello there!
In this case, according to the given chemical reaction at equilibrium, we can set up the equilibrium expression as follows:
[tex]K=\frac{[CO][Cl_2]}{[COCl_2]}[/tex]
Which can be written in terms of x, according to the ICE table:
[tex]0.32=\frac{x^2}{0.015M-x}[/tex]
Thus, we solve for x to obtain that it has a value of 0.01436 M and therefore, the concentrations at equilibrium turn out to be:
[tex][CO]=[Cl_2]=0.01436M[/tex]
[tex][COCl_2]=0.015M-0.01436M=0.00064M[/tex]
Regards!
Q13 Which compound has a boiling point that is influenced by hydrogen bonding?
A CH3CHO
B CH3OCH3
C HCO2H
D HCO2CH3
Answers
Answer:
[tex]A. \: \: CH _{3}CHO[/tex]
ethanal
This is because hydrogen is bonded with oxygen atom which is highly electronegative.
How many total valence electrons are present
in the CH3Cl molecule? Please help
Answers
Answer:
I think the answer is 14 I am not sure
Please help ASAP!!
Explain why a pond at 18 °C has more thermal energy than a cup of boiling water at
100 °C.
Answers
Answer:
The pond has more energy because I is so much larger that the Cup of boiling water. Since that mass of the pond is so much larger, It is generating more energy than a boiling cup of water.
Which phase change results in atoms with the highest kinetic energy? A. Boiling B. Melting C. Freezing D. Condensing
Answers
Answer: Boiling because it makes the molecules in water bounce around.
Hope it helps.
Consider an electrochemical decomposition apparatus comprised of a strontium chloride cell, a berylium chloride cell, and a barium chloride cell (you should be able deduce the formulae for these compounds). If sufficient charge is passed through the circuit to produce 20 g of strontium in the molten strontium chloride cell, what quantity of berylium is expected in the berylium chloride cell
Answers
Answer:
Explanation:
Atomic weight of strontium ( Sr ) is 88 .
Atomic weight of Beryllium ( Be) is 9 .
Both are bivalent .
2 x 96500 coulomb is required to decompose 88 g of Sr .
88 g of Sr requires 2 x 96500 coulomb of charge
20 g of Sr will require 2 x 96500 x 20 / 88 coulomb of charge
coulomb of charge required = 43863.63 coulomb .
9 g of Be requires 2 x 96500 coulomb of charge
2 x 96500 coulomb of charge gives 9 g of Be
43863.63 coulomb .of charge gives 9 x 43863.63 / (2 x 96500 ) g of Be
= 2.04 g.
Manganese is a transition metal. Consider the isotope: Mn-53. How many protons are in an atom of Mn-53 if the atom has a charge of 5?
Answers
Answer:
25
Explanation:
Isotopes of an element are the same element with different mass numbers but the same atomic number or the number of protons.
we know that in a balanced atom
Number of electrons = Number of protons = Atomic number
Atomic number (z) of manganese = 25
For Mn+5, the number of protons remains the same = 25
However, the number of electrons on Mn+5 = 21
Answer: 25
Explanation:
At 25.0° C, a 10.00 L vessel is filled with 5.25 moles of Gas A and 7.75 moles of Gas B. What is the total pressure in atm?
Answers
Answer:
23.12 atm
Explanation:
First, add together the moles of the two samples:
5.25 moles + 4.20 moles = 9.45 moles
273 + 25 = 298 K for the temperature
volume is 10.0 L
Since we have moles now, we have to rearrange our ideal law equation to solve for pressure:
[tex]P = \frac{nRT}{V}[/tex]
[tex]\frac{(9.45 moles) X (0.08206) X (298 K)}{10.0 L}[/tex]
9.45 X .08206 X 298 all divided by 10.0 = 23.09202 atm (or 23.12)
When was the "Permian Era"?
Answers
Answer:
298.9 million years ago - 251.902 million years ago
Explanation:
It might be in the 2011 Earth Science Review Packet so maybe go check that out
Why does the standard model of the universe need to be change?
Answers
Explanation:
The standard model of particle physics is a relativistic theory of quantum fields developed between 1970 and 1973 [citation needed] based on the ideas of unification and symmetries [1] that describes the fundamental structure of matter and vacuum considering the elementary particles as irreducible entities whose kinematics is governed by the four known fundamental interactions (except for gravity, whose main theory, general relativity, does not fit the mathematical models of the quantum world). The word "model" in the name comes from the 1970s when there was not enough experimental evidence to confirm the model. [1] To date, almost all experimental tests of the three forces described by the standard model are in agreement. with their predictions. However, the standard model falls short of being a complete theory of fundamental interactions due to several unresolved issues.
What is the [H+] if [OH-] = 1 x 10-5 M?
Answers
Because kw= (H+ )x (oH-)
An object has a mass of 0.0124 kg and a volume of 1893 mm^3. What is its density in grams per cubic centimeter?
Answers
Answer:
[tex]d=6.34g/cm^3[/tex]
Explanation:
Hello there!
In this case, since the calculation of density is performed by dividing the mass over volume:
[tex]d=\frac{m}{V}[/tex]
Which gives us a better understanding of the degree of compactness of the object; we can find the required density in grams per cubic centimeter by applying the following dimensional analysis in the aforementioned equation:
[tex]d=\frac{0.0124kg}{1893mm^3} *(\frac{10mm}{1cm} )^3*\frac{1000g}{1kg}\\\\d=6.34g/cm^3[/tex]
Regards!
why is FCN linear and not bent
Answers
Answer:
The key difference between linear and bent molecules is that linear molecules have atoms bonded to each other, forming a straight molecule, whereas bent molecules have atoms arranged in a bend-shape with an angle. The terms linear molecules and bent molecules describe the shapes of different molecules.
Explanation:
bcz of molecules ............
Give two different conditions under which long chain hydrocarbons may be cracked.
Answers
Answer:
Various methods can be used for cracking, eg catalytic cracking and steam cracking: Catalytic cracking uses a temperature of approximately 550°C and a catalyst known as a zeolite which contains aluminium oxide and silicon oxide. Steam cracking uses a higher temperature of over 800°C and no catalyst.
explain how dna which is 6 feet long, can be stored in the nucleus of a tiny human cell.
Answers
Answer:
Packed inside the nucleus of every human cell are nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1.5 inches long. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging.
Explanation:
Packed inside the nucleus of every human cell are nearly 6 feet of DNA, which is divided into 46 individual molecules, one for each chromosome and each about 1.5 inches long. Packing all this material into a microscopic cell nucleus is an extraordinary feat of packaging. For DNA to function, it can't be crammed into the nucleus like a ball of string. Instead, it is combined with proteins and organized into a precise, compact structure, a dense string-like fiber called chromatin.
(hope this helps can i plz have brainlist :D hehe)
Who would require more Calories to maintain their weight, and why? Person A: 6
feet tall, 190 lbs, exercises for 30 minutes every day. Person B: 5 feet 6 inches tall,
150 lbs, exercises 10 minutes every day. *
Answers
A city along the coast of the Atlantic Ocean experiences a seasonal high of 76°F in the summer. The city experiences a seasonal low of 23°F in the winter.
Another city is 60 miles inland and at the same latitude and elevation. This city will probably experience _______ summer highs and _______ winter lows.
Answers
Answer:
Warmer and cooler
Explanation:
The city which is along the coast of the Atlantic Ocean may experience a seasonal high of 76°F in summer. The city also has a seasonal low of 23°F in the winter. Another city is 60 miles inland and at the same latitude and elevation, this means that the city has cool winter lows and a warmer supper high.Answer:
warmer and cooler i just did it on study island
Explanation:
BONUS QUESTION
you are stuck with a problem. You need to measure pH of a solution known to be made from a metal hydroxide, but you don't have a meter or any indicators. You do happen to have some lead(II) nitrate that is soluble, and you remember that lead (II) hydroxide is insoluble. You add some to 1 liter of your own unkown solution and a precipitate forms. You add more unttil the precipitate stops forming and then a bit more just in case. After you filter and dry the precipitate, you have 3.81 grams of it. What was the approximate pH of the original solution?
*This is just a bonus question but I'm very confused on it so any help would be appreciated*
Answers
Answer:
pH = 12.5
Explanation:
The reaction that takes place is
2OH⁻(aq) + Pb⁺²(aq) → Pb(OH)₂(s)The OH⁻ species come from the metal hydroxide of the solution, and Pb(OH)₂ is the precipitate.
Now we convert 3.81 grams of Pb(OH)₂ into moles, using its molar mass:
3.81 g ÷ 241.12 g/mol = 0.0158 mol Pb(OH)₂Now we convert 0.0158 Pb(OH)₂ moles into OH⁻ moles, using the stoichiometric coefficients of the reaction:
0.0158 mol Pb(OH)₂ * [tex]\frac{2molOH^-}{1molPb(OH)_2}[/tex] = 0.0316 mol OH⁻With the given concentration (1 L), we calculate [OH⁻]:
[OH⁻] = 0.0316 mol / 1 L = 0.0316 MThen we calculate the pOH of the solution:
pOH = - log[OH⁻] = 1.5And finally we calculate the pH:
pH = 14 - pOHpH = 12.5How many grams of silver chromate will precipitate when 250.0 mL of 0.350 M silver nitrate are added to 250.0 mL of 0.450 M potassium chromate?
Answers
Answer:
2 AgNO3(aq) + K2CrO4(aq) Ag2CrO4(s) + 2 KNO3(aq)
Explanation:
0.150 L AgNO3 0.500 moles AgNO3 1 moles Ag2CrO4 331.74 g Ag2CrO4 = 12.4 g Ag2CrO4
1 L 2 moles AgNO3 1 moles Ag2CrO4
0.100 L K2CrO4 0.400 moles K2CrO4 1 moles Ag2CrO4 331.74 g Ag2CrO4 = 13.3 g Ag2CrO4
1 L 1 moles K2CrO4 1 moles Ag2CrO4
Students performed an investigation on how aluminum cans taken to a recyle center were able to be reused. They found out an aluminum can undergoes which type of change?
a physical change because the can is heated
a chemical change because new metal is formed
a physical change because the material remains the same
a chemical change because an old can is changed into a new can
Answers
Answer:
The correct answer is - a physical change because the material remains the same.
Explanation:
A chemical change is the change that results in the formation of the new element or the substance whereas the physical change remains the same material or substance even after the change.
The physical change can be a change in density, size, shape, or volume, and other properties. In the recycling of the aluminum can the material remain the same only shape or size of the aluminum change order to reuse.
Answer:
its D i promise
Explanation:
Define the term valence electrons
Answers
Answer:
Valence electrons are the number of electrons in an outer shell of an atom that can participate in forming chemical bonds with other atoms.
Which of the following statements sounds correct to you?
a) There are different definitions of acids and bases
b) Vegetables are acidic
c) Vegetables are alkaline
Answers
A method called "acid-alkaline balance" affects your health. The pH determines the acidity or alkalinity of a substance and is measured at a 0 to 14 scale.
The more acidic the fluid is the lower the pH. The higher the pH the more the solution will be alkaline (or base). If a mixture is within the range neither acid nor alkaline it has a neutral pH of 7 since both acidic or basic are commonly vegetable products. Note that trend of food in the body is acidic or alkaline and has nothing to do with its actual pH.Therefore the final answer is "Option a".
Learn more:
brainly.com/question/4399761
5 lollipops = 6 gumballs
8 gumballs = 6 lemonheads
14 lemonheads = 11
Answers
Explanation:
5 lollipops = 6 gumballs
8 gumballs = 6 lemonheads
14 lemonheads = 11 lollipops
It is in chain rule form.
Answer:
야만적 인 사랑은 누군가가 천사처럼 보이지만 야만적 인 사랑은 당신의 마음을 부러 뜨리게했다너무 귀엽다
Explanation:
난 천사야 네가 무슨 뜻인지 말해줘나는 모든 것을 가지고 나는 그것을 다시 포기하지 않을 것이다